Tag Archives: nodemcu

Compilation, Software

ESP32 – Nodemcu firmware compiling

2018-08-17 admin

After the compilation of the MicroPython firmware for ESP32

ESP32 – MicroPython compiling for ESP32

this article shows how to generate the Nodemcu firmware for the ESP32 MCU.

The firmware is not yet complete as the one existing for ESP8266.

The instructions can be found on the github at the link

https://github.com/nodemcu/nodemcu-firmware/tree/dev-esp32

The compilation documentation is available at the link

https://nodemcu.readthedocs.io/en/dev-esp32/en/build/

The operating system used is Debian 9 previously encountered for the esptool and Adafruit-ampy utilities

MicroPython – Python on embedded devices

Log on with the operating system user on Debian 9, sviluppo in our case; under the home folder create the Esp32 folder and inside this folder the nodemcu folder

cd
mkdir Esp32
cd Esp32
mkdir nodemcu
cd nodemcu

mkdir Esp32

cd Esp32

mkdir nodemcu

cd nodemcu

Clone the repository

git clone --branch dev-esp32 --recurse-submodules https://github.com/nodemcu/nodemcu-firmware.git nodemcu-firmware-esp32

1	git clone --branch dev-esp32 --recurse-submodules https://github.com/nodemcu/nodemcu-firmware.git nodemcu-firmware-esp32

To update the cloned repository follow the description on the compilation link, i.e.

cd nodemcu-firmware-esp32 
git pull origin dev-esp32 
git submodule init #only if repo was cloned w/o submodules init 
git submodule update --recursive

cd nodemcu-firmware-esp32

git pull origin dev-esp32

git submodule init #only if repo was cloned w/o submodules init

git submodule update --recursive

Go into nodemcu-firmware-esp32 folder and run

cd nodemcu-firmware-esp32
make menuconfig

1 2	cd nodemcu-firmware-esp32 make menuconfig

Enable the bluetooth in Component config–>Bluetooth

Enable various modules in Component config–>Nodemcu modules

In the flash settings we set the default values for our ESP32, Serial flasher config->

Save the configuration and exit. To build the firmware run

make

make

At the end of the compilation the command to upload the firmware is shown; the same operation is executed by simply running

make flash

1	make flash

For informations about the partitions of the various ESP32 versions, refer to the documentation

http://api-guides/partition-tables.html

In the next article we’ll show how to make an application using the Espressif SDK

ESP32 – IDF Sdk

Development, Hardware, Software

MQTT with BeagleBone and ESP8266 – MQTT on ESP8266 with Relay

2017-04-01 admin

After the article about the connection with the temperature and humidity sensor

MQTT with BeagleBone and ESP8266 – MQTT on ESP8266 with temperature sensor

in this article we set the esp8266 to run a relay. Here is how we connect the relay to the ESP module

In this example too we will consider the option of putting the nodemcu in sleep. To have the node back form the sleep the system has to reboot and it is necessary to connect the PIN D0 (GPIO16) to RST PIN as specified in the nodemcu documentation

Nodemcu sleep

Let us take a look at the lua code; It consists of init.lua and relay.lua files.

We analyze now the main points of each file

init.lua

-- init.lua
SSID="SSID" -- SSID 
PASSWORD="password" -- SSID password
TIMEOUT=10000   -- timeout to check the network status
EXSENSOR1="relay.lua"   -- module to run
MQTTSERVER="mqttaddress"   -- mqtt broker address
MQTTPORT="1883" -- mqtt broker port
MQTTQOS="0" -- qos used

-- Set the netowrk parameters and get ip address
wifi.setmode(wifi.STATION)
wifi.sta.config(SSID, PASSWORD)
wifi.sta.getip()


-- Check the network status after the TIMEOUT interval
tmr.alarm(0, TIMEOUT,tmr.ALARM_SINGLE, function()
    status=wifi.sta.status()
   -- if esp8266 got the ip
   if (status == wifi.STA_GOTIP ) then

        dofile(EXSENSOR1)
        
    
    else
        -- Without up restart the node
        print("Error acquiring ip address=",status)
        node.restart()
    end


end

)

-- init.lua

SSID="SSID" -- SSID

PASSWORD="password" -- SSID password

TIMEOUT=10000 -- timeout to check the network status

EXSENSOR1="relay.lua" -- module to run

MQTTSERVER="mqttaddress" -- mqtt broker address

MQTTPORT="1883" -- mqtt broker port

MQTTQOS="0" -- qos used

-- Set the netowrk parameters and get ip address

wifi.setmode(wifi.STATION)

wifi.sta.config(SSID, PASSWORD)

wifi.sta.getip()

-- Check the network status after the TIMEOUT interval

tmr.alarm(0, TIMEOUT,tmr.ALARM_SINGLE, function()

status=wifi.sta.status()

-- if esp8266 got the ip

if (status == wifi.STA_GOTIP ) then

dofile(EXSENSOR1)

else

-- Without up restart the node

print("Error acquiring ip address=",status)

node.restart()

end

)

In the file we set the the parameters to access the wifi network, the address and port of the MQTT broker and the file to be run on the ESP after wifi connection to the access point is estabilished. If the ESP doesn’t acquire the network address the system is restarted.

relay.lua

-- relay.lua
CNAME="relay1" -- Client name 
AMBIENT="home"  -- Ambient name 
STOPIC     = AMBIENT.."/"..CNAME.."/status"  -- Status topic
CTOPIC     = AMBIENT.."/"..CNAME.."/command" --Command topic   
MTOPIC     = AMBIENT.."/"..CNAME.."/monitor" --Monitor topic


sleep_in_seconds= nil --Sleep in seconds


TUPDATE = 20 -- Time interval for update monitor in seconds
RPIN        =1 -- Relay Pin
TGEN = 5 -- Time interval in seconds usend in various trm
gpio.mode(RPIN,gpio.OUTPUT) -- Set Relay pin mode
gpio.write(RPIN,gpio.LOW) -- Default output is OFF





-- Define Client Name and connection parameters
mqt = mqtt.Client(CNAME, 60, "", "", 1) 

-- Subscribe to the topics and send status to the status topic
mqt:on("connect", function() 
    mqt:subscribe(STOPIC, MQTTQOS)
    mqt:subscribe(CTOPIC, MQTTQOS)
    mqt:subscribe(MTOPIC, MQTTQOS)
    send_status("Relay ready again")
end )

-- Callback when mqtt is offline
mqt:on("offline", function() print("mqtt offline");  end)

--Callback to manage messages 
mqt:on("message", function(client, topic, data) 
    manage_message(client, topic, data) 
end)

-- Function to filter the messages
function manage_message(client, topic, data) 
    -- If CTOPIC: command topic
    if topic == CTOPIC then

        -- If the command is Restart
        if data == "Restart" then
            send_status("Restarting")
            send_mstatus("Restarting")
            tmr.alarm(2, TGEN*1000, tmr.ALARM_SINGLE, node.restart)
        -- If the command is null    
        elseif data == nil then
            send_status("Command not valid")
        -- Command to turn on the Relay    
        elseif data == "ON" then
            relay_on()
        -- Command to turn off the Relay    
        elseif data == "OFF" then
            relay_off()  
        -- Command to check the state of the Relay    
        elseif data == "Status" then
            relay_status()         
            
        else
            -- Check the Sleep command
            i=string.len(data)
            dato=string.sub(data,1,5)

            if dato == "Sleep" then
                ndato=string.sub(data,6)
                TSLEEP=tonumber(ndato)
                if TSLEEP ~= nil then

                    if TSLEEP >= 1 then
 
                        -- Sets the interval in seconds to sleep
                        sleep_in_seconds=TSLEEP*60
                        esp_sleep()
                    else
                        -- Send an error in Sleep command
                        send_status("Sleep command error")
                    
                    end
                else
                    -- Send an error in Sleep command 
                    send_status("Sleep command error")
                end

            else
                -- Command not managed           
                send_status("Command not valid")      

            end
            
        end
        
    end
end

-- Function to turn on the relay
function relay_on()
    
    gpio.write(RPIN,gpio.HIGH)
    send_status("Relay ON")
end

-- Function to turn off the relay
function relay_off()
    
    gpio.write(RPIN,gpio.LOW)
    send_status("Relay OFF")
end

-- Function to check if the the relay is on or off
function relay_status()
    
    risultato=gpio.read(RPIN)

    if(risultato==1) then
        send_status("Relay ON")
    elseif(risultato==0) then
        send_status("Relay OFF")
    end
end


-- Function to send messages to to STOPIC: status topic
function send_status(message)
    mqt:publish(STOPIC, message, MQTTQOS, 0)
    
end

-- Fucntion to send messages to MTOPIC: monitor topic
function send_mstatus(message)
    mqt:publish(MTOPIC, message, MQTTQOS, 0)
    
end


-- Function that sleeps esp8266
function esp_sleep()
 
    send_status("Relay going to sleep now")
    send_mstatus("Relay going to sleep now")
    -- Delayd sleep to send the message above.
    tmr.alarm(3, TGEN*1000, tmr.ALARM_SINGLE, function() 
        node.dsleep(sleep_in_seconds*1000000) 
    end)
end


-- Connection to the mqtt server at the msttport
mqt:connect(MQTTSERVER, MQTTPORT, 0, 1)



-- Send periodically a message to the monitor topic
tmr.alarm(4, TUPDATE*1000, tmr.ALARM_AUTO, function() send_mstatus("Relay Ready") end)

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-- relay.lua

CNAME="relay1" -- Client name

AMBIENT="home" -- Ambient name

STOPIC = AMBIENT.."/"..CNAME.."/status" -- Status topic

CTOPIC = AMBIENT.."/"..CNAME.."/command" --Command topic

MTOPIC = AMBIENT.."/"..CNAME.."/monitor" --Monitor topic

sleep_in_seconds= nil --Sleep in seconds

TUPDATE = 20 -- Time interval for update monitor in seconds

RPIN =1 -- Relay Pin

TGEN = 5 -- Time interval in seconds usend in various trm

gpio.mode(RPIN,gpio.OUTPUT) -- Set Relay pin mode

gpio.write(RPIN,gpio.LOW) -- Default output is OFF

-- Define Client Name and connection parameters

mqt = mqtt.Client(CNAME, 60, "", "", 1)

-- Subscribe to the topics and send status to the status topic

mqt:on("connect", function()

mqt:subscribe(STOPIC, MQTTQOS)

mqt:subscribe(CTOPIC, MQTTQOS)

mqt:subscribe(MTOPIC, MQTTQOS)

send_status("Relay ready again")

end )

-- Callback when mqtt is offline

mqt:on("offline", function() print("mqtt offline"); end)

--Callback to manage messages

mqt:on("message", function(client, topic, data)

manage_message(client, topic, data)

end)

-- Function to filter the messages

function manage_message(client, topic, data)

-- If CTOPIC: command topic

if topic == CTOPIC then

-- If the command is Restart

if data == "Restart" then

send_status("Restarting")

send_mstatus("Restarting")

tmr.alarm(2, TGEN*1000, tmr.ALARM_SINGLE, node.restart)

-- If the command is null

elseif data == nil then

send_status("Command not valid")

-- Command to turn on the Relay

elseif data == "ON" then

relay_on()

-- Command to turn off the Relay

elseif data == "OFF" then

relay_off()

-- Command to check the state of the Relay

elseif data == "Status" then

relay_status()

else

-- Check the Sleep command

i=string.len(data)

dato=string.sub(data,1,5)

if dato == "Sleep" then

ndato=string.sub(data,6)

TSLEEP=tonumber(ndato)

if TSLEEP ~= nil then

if TSLEEP >= 1 then

-- Sets the interval in seconds to sleep

sleep_in_seconds=TSLEEP*60

esp_sleep()

else

-- Send an error in Sleep command

send_status("Sleep command error")

end

else

-- Send an error in Sleep command

send_status("Sleep command error")

end

else

-- Command not managed

send_status("Command not valid")

end

-- Function to turn on the relay

function relay_on()

gpio.write(RPIN,gpio.HIGH)

send_status("Relay ON")

end

-- Function to turn off the relay

function relay_off()

gpio.write(RPIN,gpio.LOW)

send_status("Relay OFF")

end

-- Function to check if the the relay is on or off

function relay_status()

risultato=gpio.read(RPIN)

if(risultato==1) then

send_status("Relay ON")

elseif(risultato==0) then

send_status("Relay OFF")

end

-- Function to send messages to to STOPIC: status topic

function send_status(message)

mqt:publish(STOPIC, message, MQTTQOS, 0)

end

-- Fucntion to send messages to MTOPIC: monitor topic

function send_mstatus(message)

mqt:publish(MTOPIC, message, MQTTQOS, 0)

end

-- Function that sleeps esp8266

function esp_sleep()

send_status("Relay going to sleep now")

send_mstatus("Relay going to sleep now")

-- Delayd sleep to send the message above.

tmr.alarm(3, TGEN*1000, tmr.ALARM_SINGLE, function()

node.dsleep(sleep_in_seconds*1000000)

end)

end

-- Connection to the mqtt server at the msttport

mqt:connect(MQTTSERVER, MQTTPORT, 0, 1)

-- Send periodically a message to the monitor topic

tmr.alarm(4, TUPDATE*1000, tmr.ALARM_AUTO, function() send_mstatus("Relay Ready") end)

The relay.lua file manages the relay, the subscription on MQTT broker with submission of the data. Global parameters have been set to manage the topic, the waiting time in tmr.alarm. There are in particular the following topics

/home/relay1/status : Status topic. The status is sent at the start and at request from the command topic /home/relay1/command.
/home/relay1/monitor: Status of the esp sent periodically to this topic.
/home/relay1/command: Other clients can send commands to the esp:
- Restart: Restarts the esp.
- Sleep n: Put to sleep for n seconds the esp.
- ON: Turn on the relay.
- OFF: Turn off the relay.
- Status: Request of tthe relay status (ON or OFF).

There are various service functions to manage all. The comments in the code describe each feature.

In the next article we will set up the webserver on Beaglebone and the websocket configuration for Mosquitto always on the Beaglebone

MQTT with BeagleBone and ESP8266 – WebServer and MQTT WebSocket

Development, Hardware, Software

MQTT with BeagleBone and ESP8266 – MQTT on ESP8266 with temperature sensor

2017-03-23 admin

After loading the firmware into the device esp8266

MQTT with BeagleBone and ESP8266-MQTT ESP8266

we now connect this module with a DHT11 temperature and humidity sensor. Here is how we connect the sensor to the ESP module

In this example we will consider the option of putting the nodemcu in sleep. To have the node back form the sleep the system has to reboot and it is necessary to connect the PIN D0 (GPIO16) to RST PIN as specified in the nodemcu documentation

Nodemcu sleep

Let us take a look at the lua code; It consists of init.lua and tempumid.lua files.

We analyze now the main points of each file

init.lua

-- init.lua
SSID="SSDNAME" -- SSID 
PASSWORD="passwordssid" -- SSID password
TIMEOUT=10000    -- timeout to check the network status
EXSENSOR1="tempumid.lua"    -- module to run
MQTTSERVER="mqttbrokeraddress"   -- mqtt broker address
MQTTPORT="1883"  -- mqtt borker port
MQTTQOS="0" -- qos used

-- Set the netowrk parameters and get ip address
wifi.setmode(wifi.STATION)
wifi.sta.config(SSID, PASSWORD)
wifi.sta.getip()

-- Check the network status after the TIMEOUT interval
tmr.alarm(0, TIMEOUT,tmr.ALARM_SINGLE, function()
    status=wifi.sta.status()
    
    -- if esp8266 got the ip
   if (status == wifi.STA_GOTIP ) then

       dofile(EXSENSOR1)
        
    
    else
        -- Without ip restart the node
        print("Error acquiring ip address=",status)
        node.restart()
    end


end

-- init.lua

SSID="SSDNAME" -- SSID

PASSWORD="passwordssid" -- SSID password

TIMEOUT=10000 -- timeout to check the network status

EXSENSOR1="tempumid.lua" -- module to run

MQTTSERVER="mqttbrokeraddress" -- mqtt broker address

MQTTPORT="1883" -- mqtt borker port

MQTTQOS="0" -- qos used

-- Set the netowrk parameters and get ip address

wifi.setmode(wifi.STATION)

wifi.sta.config(SSID, PASSWORD)

wifi.sta.getip()

-- Check the network status after the TIMEOUT interval

tmr.alarm(0, TIMEOUT,tmr.ALARM_SINGLE, function()

status=wifi.sta.status()

-- if esp8266 got the ip

if (status == wifi.STA_GOTIP ) then

dofile(EXSENSOR1)

else

-- Without ip restart the node

print("Error acquiring ip address=",status)

node.restart()

end

In the file we set the the parameters to access the wifi network, the address and port of the MQTT broker and the file to be run on the ESP after wifi connection to the access point is estabilished. If the ESP does’t acquire the netowrk address the system is restarted.

tempumid.lua

-- tempumid.lua
CNAME="room1" -- Client name 
AMBIENT="home"  -- Ambient name
TTOPIC     = AMBIENT.."/"..CNAME.."/temperature"  -- Temperature topic
HTOPIC     = AMBIENT.."/"..CNAME.."/humidity"  -- Humidity topic 
STOPIC     = AMBIENT.."/"..CNAME.."/status"  -- Status topic
CTOPIC     = AMBIENT.."/"..CNAME.."/command" --Command topic   
MTOPIC     = AMBIENT.."/"..CNAME.."/monitor" --Monitor topic


sleep_in_seconds= nil --Sleep in seconds


TUPDATE = 15 -- Time interval for update monitor in seconds
TUPTEMP = 10 -- Time interval for update temperature and humidity values
SPIN         = 4  -- Sensor pin
TGEN = 5 -- Time interval in seconds usend in various trm


-- Define Client Name and connection parameters
mqt = mqtt.Client(CNAME, 60, "", "", 1) 

-- Subscribe to the topics and send status to the status topic
mqt:on("connect", function() 
    mqt:subscribe(STOPIC, MQTTQOS)
    mqt:subscribe(CTOPIC, MQTTQOS)
    mqt:subscribe(MTOPIC, MQTTQOS)
    mqt:subscribe(TTOPIC, MQTTQOS)
    mqt:subscribe(HTOPIC, MQTTQOS)
    send_status("Sensor ready again")
end )

-- Callback when mqtt is offline
mqt:on("offline", function() print("mqtt offline");  end)

--Callback to manage messages 
mqt:on("message", function(client, topic, data) 
    manage_message(client, topic, data) 
end)


-- Function to filter the messages
function manage_message(client, topic, data) 
    -- If CTOPIC: command topic
    if topic == CTOPIC then
        --print("Command")
        -- If the command is Restart
        if data == "Restart" then
            send_status("Restarting")
            send_mstatus("Restarting")
            tmr.alarm(2, TGEN*1000, tmr.ALARM_SINGLE, node.restart)
            --print("restart")
        -- If the command is null    
        elseif data == nil then
           -- print("Command not valid")
            send_status("Command not valid")
        
        
        else
            -- Check the Sleep command           
            i=string.len(data)
            dato=string.sub(data,1,5)
          
            if dato == "Sleep" then
                ndato=string.sub(data,6)
                TSLEEP=tonumber(ndato)
                if TSLEEP ~= nil then
                    if TSLEEP >= 1 then
                        -- Sets the interval in seconds to sleep
                        sleep_in_seconds=TSLEEP*60
                        esp_sleep()
                    else
                        -- Send an error in Sleep command
                        send_status("Sleep command error")
                    
                    end
                else
                    -- Send an error in Sleep command 
                    send_status("Sleep command error")
                end

            else
                -- Command not managed           
                send_status("Command not valid")      

            end
            
        end
        
    end
end

-- Function to send messages to STOPIC: status topic
function send_status(message)
    mqt:publish(STOPIC, message, MQTTQOS, 0)
    
end

-- Fucntion to send messages to MTOPIC: monitor topic
function send_mstatus(message)
    mqt:publish(MTOPIC, message, MQTTQOS, 0)
    
end

-- Function to display temp and hum
function display_temphum(temp,humi)
    print("Temperature=%d, Humidity=%d",temp,humi)
end

 
-- Function to read and publish temperature and humidity
function read_temp_hum(client)
    status, temp, humi, temp_dec, humi_dec = dht.read(SPIN)
    if status == dht.OK then
    
        mqt:publish(TTOPIC, temp,MQTTQOS, 0)
        mqt:publish(HTOPIC, humi, MQTTQOS, 0)
        
       -- display_temphum(temp,humi)
       
    elseif status == dht.ERROR_CHECKSUM then
        print( "DHT Checksum error." )
    elseif status == dht.ERROR_TIMEOUT then
        print( "DHT timed out." )
    end
end


-- Function that sleeps esp8266
function esp_sleep()
 
    send_status("Sensor going to sleep now")
    send_mstatus("Sensor going to sleep now")
    -- Delayd sleep to send the message above.
    tmr.alarm(3, TGEN*1000, tmr.ALARM_SINGLE, function() 
        node.dsleep(sleep_in_seconds*1000000) 
    end)
end

-- Connection to the mqtt server at the mqttport
mqt:connect(MQTTSERVER, MQTTPORT, 0, 1)

--Sends periodically the temperature and humidity to the topics
tmr.alarm(1, TUPTEMP*1000, tmr.ALARM_AUTO, function() read_temp_hum(mqt) end)

-- Sends periodically a message to the monitor topic
tmr.alarm(4, TUPDATE*1000, tmr.ALARM_AUTO, function() send_mstatus("Sensor Ready") end)

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-- tempumid.lua

CNAME="room1" -- Client name

AMBIENT="home" -- Ambient name

TTOPIC = AMBIENT.."/"..CNAME.."/temperature" -- Temperature topic

HTOPIC = AMBIENT.."/"..CNAME.."/humidity" -- Humidity topic

STOPIC = AMBIENT.."/"..CNAME.."/status" -- Status topic

CTOPIC = AMBIENT.."/"..CNAME.."/command" --Command topic

MTOPIC = AMBIENT.."/"..CNAME.."/monitor" --Monitor topic

sleep_in_seconds= nil --Sleep in seconds

TUPDATE = 15 -- Time interval for update monitor in seconds

TUPTEMP = 10 -- Time interval for update temperature and humidity values

SPIN = 4 -- Sensor pin

TGEN = 5 -- Time interval in seconds usend in various trm

-- Define Client Name and connection parameters

mqt = mqtt.Client(CNAME, 60, "", "", 1)

-- Subscribe to the topics and send status to the status topic

mqt:on("connect", function()

mqt:subscribe(STOPIC, MQTTQOS)

mqt:subscribe(CTOPIC, MQTTQOS)

mqt:subscribe(MTOPIC, MQTTQOS)

mqt:subscribe(TTOPIC, MQTTQOS)

mqt:subscribe(HTOPIC, MQTTQOS)

send_status("Sensor ready again")

end )

-- Callback when mqtt is offline

mqt:on("offline", function() print("mqtt offline"); end)

--Callback to manage messages

mqt:on("message", function(client, topic, data)

manage_message(client, topic, data)

end)

-- Function to filter the messages

function manage_message(client, topic, data)

-- If CTOPIC: command topic

if topic == CTOPIC then

--print("Command")

-- If the command is Restart

if data == "Restart" then

send_status("Restarting")

send_mstatus("Restarting")

tmr.alarm(2, TGEN*1000, tmr.ALARM_SINGLE, node.restart)

--print("restart")

-- If the command is null

elseif data == nil then

-- print("Command not valid")

send_status("Command not valid")

else

-- Check the Sleep command

i=string.len(data)

dato=string.sub(data,1,5)

if dato == "Sleep" then

ndato=string.sub(data,6)

TSLEEP=tonumber(ndato)

if TSLEEP ~= nil then

if TSLEEP >= 1 then

-- Sets the interval in seconds to sleep

sleep_in_seconds=TSLEEP*60

esp_sleep()

else

-- Send an error in Sleep command

send_status("Sleep command error")

end

else

-- Send an error in Sleep command

send_status("Sleep command error")

end

else

-- Command not managed

send_status("Command not valid")

end

-- Function to send messages to STOPIC: status topic

function send_status(message)

mqt:publish(STOPIC, message, MQTTQOS, 0)

end

-- Fucntion to send messages to MTOPIC: monitor topic

function send_mstatus(message)

mqt:publish(MTOPIC, message, MQTTQOS, 0)

end

-- Function to display temp and hum

function display_temphum(temp,humi)

print("Temperature=%d, Humidity=%d",temp,humi)

end

-- Function to read and publish temperature and humidity

function read_temp_hum(client)

status, temp, humi, temp_dec, humi_dec = dht.read(SPIN)

if status == dht.OK then

mqt:publish(TTOPIC, temp,MQTTQOS, 0)

mqt:publish(HTOPIC, humi, MQTTQOS, 0)

-- display_temphum(temp,humi)

elseif status == dht.ERROR_CHECKSUM then

print( "DHT Checksum error." )

elseif status == dht.ERROR_TIMEOUT then

print( "DHT timed out." )

end

-- Function that sleeps esp8266

function esp_sleep()

send_status("Sensor going to sleep now")

send_mstatus("Sensor going to sleep now")

-- Delayd sleep to send the message above.

tmr.alarm(3, TGEN*1000, tmr.ALARM_SINGLE, function()

node.dsleep(sleep_in_seconds*1000000)

end)

end

-- Connection to the mqtt server at the mqttport

mqt:connect(MQTTSERVER, MQTTPORT, 0, 1)

--Sends periodically the temperature and humidity to the topics

tmr.alarm(1, TUPTEMP*1000, tmr.ALARM_AUTO, function() read_temp_hum(mqt) end)

-- Sends periodically a message to the monitor topic

tmr.alarm(4, TUPDATE*1000, tmr.ALARM_AUTO, function() send_mstatus("Sensor Ready") end)

The temumid.lua file manages the measurement of temperature and humidity, the subscription on MQTT broker with submission of the data. Global parameters have been set to manage the topic, the waiting time in tmr.alarm. There are in particular the following topics

/home/room1/temperature: measured temperature topic.
/home/room1/humidity: measured humidity topic.
/home/room1/status : Status topic. The status is sent at the start and at request from the command topic /home/room1/command.
/home/room1/monitor: Status of the esp sent periodically to this topic.
/home/room1/command: Other clients can send commands to the esp:
- Restart: Restarts the esp.
- Sleep n: Put to sleep for n seconds the esp.

There are various service functions to manage all. The comments in the code describe each feature.

In the next article we will set up the esp with the relay

MQTT with BeagleBone and ESP8266 – MQTT on ESP8266 with Relay

Configuration, Software

Mqtt with Beaglebone and ESP8266-MQTT ESP8266

2017-03-19 admin

After installing the MQTT server on BeagleBone

Mqtt with Beaglebone and ESP8266-Mosquitto installation on Beaglebone

let us set the MQTT nodes on ESP8266.

As first operation we must generate the nodemcu firmware, as described in the previous article

Nodemcu compilation on Linux

with at least the following parameters activated in user_module.h file

DHT
file
GPIO
MQTT
net
node
timer
UART
WiFi

These settings are the default in the user_module.h file.

At present the latest version 2.0 of nomemcu firmware was released. Here are the compiled files for this version of the firmware

Nodemcu2.0.0 firmware

As already described in previous articles and from the nodecmu link on flashing

Flashing the firmware

we have to set the correct parameters for the esp8266 model.

In our case, with 4MB flash, we used the parameters shown in the image to load the firmware on the device with nodemcu-flasher tool. You can also use other tools for loading the firmware. In our case, the settings used are as follows

In the next article we’ll treat the ESP8266 node that detects temperature and humidity

MQTT with BeagleBone and ESP8266 – MQTT on ESP8266 with temperature sensor

Configuration, Software

MQTT with BeagleBone and ESP8266 – Mosquitto installation on Beaglebone

2017-03-12 admin

After summarizing the architecture that we are implementing in the previous article

Mqtt with Beaglebone and ESP8266-Architecture

We proceed now with the installation of the MQTT broker on Beaglebone Black with the following version of Debian

root@beaglebone:~#  cat /etc/dogtag
BeagleBoard.org Debian Image 2016-11-06
root@beaglebone:~# uname -a
Linux beaglebone 4.4.30-ti-r64 #1 SMP Fri Nov 4 21:23:33 UTC 2016 armv7l GNU/Lux

root@beaglebone:~# cat /etc/dogtag

BeagleBoard.org Debian Image 2016-11-06

root@beaglebone:~# uname -a

Linux beaglebone 4.4.30-ti-r64 #1 SMP Fri Nov 4 21:23:33 UTC 2016 armv7l GNU/Lux

The image used is the following

Beaglebone Black Image

We proceed to the configuration as described in the article

Debian sd card setup for Beaglebone Black

Proceed to extend the space on the SD card with the application gparted in a linux host or using the grow_partition.sh tool on BeagleBone in the /opt/scripts/tools folder

root@beaglebone:/opt/scripts/tools# ./grow_partition.sh

1	root@beaglebone:/opt/scripts/tools# ./grow_partition.sh

Performing the upgrade with this image we have had space issue with 4Gb partition.

The message broker we’ll use is mosquitto

Mosquitto

The version of Mosquitto with Debian Jessie doesn’t not have the Wesockets services, which we’ll use for the Dashboard. For this reason, we have to install a more recent version of Mosquitto (or recompile it from source).

Log on as root in a command shell on BeagleBone and add the Debian testing repository

cd /etc/apt
vi sources.list

1 2	cd /etc/apt vi sources.list

deb http://httpredir.debian.org/debian stretch main contrib non-free

1	deb http://httpredir.debian.org/debian stretch main contrib non-free

Run the following

apt-get update
apt-get install mosquitto
apt-get install mosquitto-clients

apt-get update

apt-get install mosquitto

apt-get install mosquitto-clients

After the installation comment the reference of the debian testing repository in /etc/apt/sources.list

#deb http://httpredir.debian.org/debian stretch main contrib non-free

1	#deb http://httpredir.debian.org/debian stretch main contrib non-free

and run

apt-get update

1	apt-get update

We test at this point if the server is installed correctly by running in a shell the subscription to a topic

mosquitto_sub -h localhost -t "topic/test"

1	mosquitto_sub -h localhost -t "topic/test"

In another command shell run the publishing on topic “topic / test”

mosquitto_pub -h localhost -t "topic/test" -m "Prova"

1	mosquitto_pub -h localhost -t "topic/test" -m "Prova"

The first shell has to show the message “Prova”

With MQTT protocol we can define different QOS, as described in the Mosquitto FAQ

QOS Mosquitto

With QoS = 0 the message is sent only once and is not required confirmation of receipt by the subscribers; the MQTT implementation in these articles is without protection with name/password or ssl channel encryption and with QOS=0.

In the next article we’ll proceed to the preparation of ESP9266 module with the Mqtt lua library inside the nodemcu firmware

MQTT with BeagleBone and ESP8266-MQTT ESP8266

Configuration, Software

Mqtt with Beaglebone and Esp8266-Architecture

2017-03-12 admin

In this series of articles we treat a MQTT message broker installed on BeagleBone Black; this componet allows to manage various esp8266 devices, to which we connect various probes such as temperaure sensors, relays.

All this is handled with the help of apps on Android and a Dashboard installed on Apache on BeagleBone.

We start from the message MQTT broker (Message Queue Telemetry Transport); here there is the description of the protocol

MQTT

In particular in the FAQ section there are the first indications on the protocol and its use

MQTT Faq

The system is formed by three components:

MQTT Broker: relays the messages published to all subscribers.
Publisher: Publish messages in the registered topics on MQTT Broker.
Subscriber: Receives messages for its registered topics from MQTT Broker.

The following shows the topology for two topics used in our example

The system is composed of a MQTT broker on BeagleBone. In this MQTT broker server you can define topics; different devices can be registered to these topics. For each topic the action can be subscription and publishing. By subscribing you receive all messages of topics, while with the publishing we can perform actions on the topic (for example, turn on a relay, restart a device, send sensor measurement,etc.). In the example we treat there will be, for example, a queue for the temperature monitor, hooked to esp8266 temperature reading device, another for the management of a relay, always run with esp8266. The MQTT broker relays the received messages among all subscribers/ publishers for each topic.

We can subcribe/publish to the topics on the MQTT broker using Android apps; the apps can receive messages and send commands to the esp8266 end device (Turn onRelay, Restart sensor, etc.).

With the javascript framework Freeboard

Freeboard

installed on the Beablebone Apache web server we can monitor in real time the end devices.

For more informations on MQTT system, consult the web site listed above.

In the next article we’ll start by installing the MQTT broker on BeagleBone Black

MQTT with BeagleBone and ESP8266 – Mosquitto installation on Beaglebone

Development, Software

Nodemcu Enduser_setup module lua sample(part2)

2016-11-28 admin

After the firmware build and its upload to the nodemcu dev kit, we connected a switch to pin D5, as shown in the previous article

Nodemcu Enduser_setup module lua sample(part1)

We finally can upload some sample code in which we use the enduser_setup module

Open ESPlorer and load the following sample code

webserver.lua

-- webserver.lua
--webserver sample from the nodemcu github
if srv~=nil then
 srv:close()
end

gpio.mode(1, gpio.OUTPUT)
srv=net.createServer(net.TCP)
srv:listen(80,function(conn)
    conn:on("receive", function(client,request)
        local buf = ""
        local _, _, method, path, vars = string.find(request, "([A-Z]+) (.+)?(.+) HTTP")
        if(method == nil)then
            _, _, method, path = string.find(request, "([A-Z]+) (.+) HTTP")
        end
        local _GET = {}
        if (vars ~= nil)then
            for k, v in string.gmatch(vars, "(%w+)=(%w+)&*") do
                _GET[k] = v
            end
        end
        buf = buf.."<h1> Hello, NodeMcu.</h1><form src=\"/\">Turn PIN1 <select name=\"pin\" onchange=\"form.submit()\">"
        local _on,_off = "",""
        if(_GET.pin == "ON")then
              _on = " selected=true"
              gpio.write(1, gpio.HIGH)
        elseif(_GET.pin == "OFF")then
              _off = " selected=\"true\""
              gpio.write(1, gpio.LOW)
        end
        buf = buf.."<option".._on..">ON</opton><option".._off..">OFF</option></select></form>"
        client:send(buf)
    end)
    conn:on("sent", function (c) c:close() end)
end)

-- webserver.lua

--webserver sample from the nodemcu github

if srv~=nil then

srv:close()

end

gpio.mode(1, gpio.OUTPUT)

srv=net.createServer(net.TCP)

srv:listen(80,function(conn)

conn:on("receive", function(client,request)

local buf = ""

local _, _, method, path, vars = string.find(request, "([A-Z]+) (.+)?(.+) HTTP")

if(method == nil)then

_, _, method, path = string.find(request, "([A-Z]+) (.+) HTTP")

end

local _GET = {}

if (vars ~= nil)then

for k, v in string.gmatch(vars, "(%w+)=(%w+)&*") do

_GET[k] = v

end

buf = buf.."<h1> Hello, NodeMcu.</h1><form src=\"/\">Turn PIN1 <select name=\"pin\" onchange=\"form.submit()\">"

local _on,_off = "",""

if(_GET.pin == "ON")then

_on = " selected=true"

gpio.write(1, gpio.HIGH)

elseif(_GET.pin == "OFF")then

_off = " selected=\"true\""

gpio.write(1, gpio.LOW)

end

buf = buf.."<option".._on..">ON</opton><option".._off..">OFF</option></select></form>"

client:send(buf)

end)

conn:on("sent", function (c) c:close() end)

end)

riasserawifi.lua

--riazzerawifi.lua
-- Starts the portal to choose the wi-fi router to which we have
-- to associate
wifi.sta.disconnect()
wifi.setmode(wifi.STATIONAP)
--ESP SSID generated wiht its chipid
wifi.ap.config({ssid="Mynode-"..node.chipid()
, auth=wifi.OPEN})
enduser_setup.manual(true)
enduser_setup.start(
  function()
    print("Connected to wifi as:" .. wifi.sta.getip())
  end,
  function(err, str)
    print("enduser_setup: Err #" .. err .. ": " .. str)
  end
);

--riazzerawifi.lua

-- Starts the portal to choose the wi-fi router to which we have

-- to associate

wifi.sta.disconnect()

wifi.setmode(wifi.STATIONAP)

--ESP SSID generated wiht its chipid

wifi.ap.config({ssid="Mynode-"..node.chipid()

, auth=wifi.OPEN})

enduser_setup.manual(true)

enduser_setup.start(

function()

print("Connected to wifi as:" .. wifi.sta.getip())

end,

function(err, str)

print("enduser_setup: Err #" .. err .. ": " .. str)

end

);

init.lua

-- init.lua
--Access Point management
pin = 5 --Input PIN
Resetta=0   --Variable used to manage AP reset
gpio.mode(pin,gpio.INPUT)   --Pin 5 in input mode

--If pin input is High let's start the nodemcu portal
if (gpio.read(pin)==gpio.HIGH ) then 

    Resetta=1
end

-- Check if reset the AP credential
if Resetta==1 then 

    -- Start the nodemcu portal
    tmr.alarm(0, 5000, 0, function() dofile("riazzerawifi.lua") end)

else
    -- Start the webserver wiht ip defined by Wi-Fi router
    tmr.alarm(0, 5000, 0, function() dofile("webserver.lua") end)

end

-- init.lua

--Access Point management

pin = 5 --Input PIN

Resetta=0 --Variable used to manage AP reset

gpio.mode(pin,gpio.INPUT) --Pin 5 in input mode

--If pin input is High let's start the nodemcu portal

if (gpio.read(pin)==gpio.HIGH ) then

Resetta=1

end

-- Check if reset the AP credential

if Resetta==1 then

-- Start the nodemcu portal

tmr.alarm(0, 5000, 0, function() dofile("riazzerawifi.lua") end)

else

-- Start the webserver wiht ip defined by Wi-Fi router

tmr.alarm(0, 5000, 0, function() dofile("webserver.lua") end)

end

It is possible to download the above samples at the following link

Sample code

Here is the documentation about the enduser_setup module

enduser_setup module documentation

The example consists of three files:

init.lua: It is executed at the startup of the esp8266.
riazzerawifi.lua: It starts the portal to connect and save the configuration to your Access Point.
webserver.lua: It starts the webserver sample on the nodemcu.

As you can see from the code in init.lua, when the pin D5 is in the state HIGH, we start the portal using enduser_setup module. In the case in which the pin D5 is in the state LOW the esp8266 acquires the IP from an Access Point defined previously after which the test webserver starts.

To save the access point confguration to which we want to connect we place the switch in order to have the HIGH input on pin D5 and reboot the card.

From a PC we can observe the presence of another access point, defined in the file riazzerawifi.lua

wifi.ap.config({ssid="Mynode-"..node.chipid()
, auth=wifi.OPEN})

1 2	wifi.ap.config({ssid="Mynode-"..node.chipid() , auth=wifi.OPEN})

composed by Mynode string + ChipID module

We can connect to this access point and via browser we access to the portal at the ip address 192.168.4.1

Select or enter the SSID of an access point providing the correct password. After the connection reposition the switch to have the LOW state for pin D5 and reboot the nodemcu dev kit.

Now the system will automatically connect to the SSID defined previously and starts the example of the web server.

Please refer to the Lua documentation nodemcu for further study and usable modules

LUA Nodemcu Documentation

Development, Software

Nodemcu Enduser_setup module lua sample(part1)

2016-11-21 admin

In the previous article we showed a sample LUA code for ESP8266

Lua sample code for esp8266

Let us now see an example in which we’ll use the enduser_setup Lua module.

As a first step we compile the nodemcu firmware by including the enduser_setup module. We have to apply the same steps discussed in the build process article

Nodemcu firmware build

editing the app/include/user_modules.h file and uncommenting the line

#define LUA_USE_MODULES_ENDUSER_SETUP

1	#define LUA_USE_MODULES_ENDUSER_SETUP

After the building and firmware upload to the device, we use a switch connected to nodemcu dev kit as shown in the picture

The pin D5 can be connected to a low or high input voltage. Based on the input voltage we can change the behavior of the system.

Note: The Pin D5 in this specific example has been used as Input Pin; in the case of use as Output Pin, you must insert a resistor to limit the output current, as specified in the link

GPIO Pin Allocations

In the next article we’lll upload a LUA sample code with enduser_setup module enabled and we’ll utilize it to manage the wifi connections

Nodemcu Enduser_setup module lua sample(part2)

Development, Software

Lua sample code for esp8266

2016-11-16 admin

As mentioned in the previous article

how to upload nodemcu firmware with esptool

we are now ready to upload some example code on ESP8266 system.

We follow the LUA Nodemcu documentation

Nodemcu LUA Documentation

and upload a simple http server on the system.

Using ESPlorer we upload the following code, a modified version of the code available on the github. Modify the fields “SSID” and “password” with the the values of your Wi-fi Router.

webserver pin

wifi.setmode(wifi.STATION)
wifi.sta.config("SSID", "password")
gpio.mode(1, gpio.OUTPUT)
srv=net.createServer(net.TCP)
srv:listen(80,function(conn)
    conn:on("receive", function(client,request)
        local buf = ""
        local _, _, method, path, vars = string.find(request, "([A-Z]+) (.+)?(.+) HTTP")
        if(method == nil)then
            _, _, method, path = string.find(request, "([A-Z]+) (.+) HTTP")
        end
        local _GET = {}
        if (vars ~= nil)then
            for k, v in string.gmatch(vars, "(%w+)=(%w+)&*") do
                _GET[k] = v
            end
        end
        buf = buf.."<h1> Hello, NodeMcu.</h1><form src=\"/\">Turn PIN1 <select name=\"pin\" onchange=\"form.submit()\">"
        local _on,_off = "",""
        if(_GET.pin == "ON")then
              _on = " selected=true"
              gpio.write(1, gpio.HIGH)
        elseif(_GET.pin == "OFF")then
              _off = " selected=\"true\""
              gpio.write(1, gpio.LOW)
        end
        buf = buf.."<option".._on..">ON</opton><option".._off..">OFF</option></select></form>"
        client:send(buf)
    end)
    conn:on("sent", function (c) c:close() end)
end)

wifi.setmode(wifi.STATION)

wifi.sta.config("SSID", "password")

gpio.mode(1, gpio.OUTPUT)

srv=net.createServer(net.TCP)

srv:listen(80,function(conn)

conn:on("receive", function(client,request)

local buf = ""

local _, _, method, path, vars = string.find(request, "([A-Z]+) (.+)?(.+) HTTP")

if(method == nil)then

_, _, method, path = string.find(request, "([A-Z]+) (.+) HTTP")

end

local _GET = {}

if (vars ~= nil)then

for k, v in string.gmatch(vars, "(%w+)=(%w+)&*") do

_GET[k] = v

end

buf = buf.."<h1> Hello, NodeMcu.</h1><form src=\"/\">Turn PIN1 <select name=\"pin\" onchange=\"form.submit()\">"

local _on,_off = "",""

if(_GET.pin == "ON")then

_on = " selected=true"

gpio.write(1, gpio.HIGH)

elseif(_GET.pin == "OFF")then

_off = " selected=\"true\""

gpio.write(1, gpio.LOW)

end

buf = buf.."<option".._on..">ON</opton><option".._off..">OFF</option></select></form>"

client:send(buf)

end)

conn:on("sent", function (c) c:close() end)

end)

Save the file as ipstatico.lua. With ESPlorer upload the file to nodemcu devkit with “Save to ESP” button .
Create a second file named init.lua

tmr.alarm(0, 5000, 0, function() dofile("ipstatico.lua") end)

1	tmr.alarm(0, 5000, 0, function() dofile("ipstatico.lua") end)

Save this file on the device.

Reboot the device with the reset command on ESPlorer tool and from the ESPlorer command bar execute

print(wifi.sta.getip())

1	print(wifi.sta.getip())

This command provides us the ip acquired by the device. We are able now to access with a browser to the assigned ip address, discovered above, and interact with a small interface that allows us to activate or not the PIN1 output

With this method, however, we need to know the Access Point to which you must connect. To overcome this limitation, we can use the enduser_sertup module

Enduser_setup module

With this module we start the ESP8266 device as an access point with a portal on which we can enter the credentials of the access point which we want to connect.

In the next article we’ll build the nodemcu firmware by adding the enduser setup module, not available in the standard firmware, and we will do the same example using this module

Enduser_setup module sample

Development, Software

How to upload nodemcu firmware with esptool

2016-10-19 admin

In the article about the Nodemcu firmware building

Nodemcu firmware building

we created in the bin folder the 0x0000.bin and 0x100000.bin files and copied the blank.bin and esp_init_data_default.bin files from the Espressif SDK.

According to the esptool tool documentation

esptool

the generic command to load the firmware is the following

esptool.py --port <serial-port-of-ESP8266> write_flash -fm <mode> -fs <size> 0x00000 <nodemcu-firmware>.bin

1	esptool.py --port <serial-port-of-ESP8266> write_flash -fm <mode> -fs <size> 0x00000 <nodemcu-firmware>.bin

In our case, as we have a development kit with 4M of flash and an 9600 USB bps we have to specify the following parameters

mode=dio
size=32m

Always according to the esptool documention, not generating the firmware with docker, we merged the two files, 0x0000.bin and 0x100000.bin, into the nodemcu_float.bin file

For our development kit we need to use the other two files

esp_init_data_default.bin: default init data.
blank.bin: to reset the configuration.

according to the mapping available at the following link

ESP8266 Guide

In our case we have to use (4M flash)

0x3FC000 address for esp_init_data_default.bin.
0x3FE000 address for blank.bin

In the shell command window move into nodemcu-firmware and set the PATH variable

/home/sviluppo/esp8266/nodemcu-firmware
export PATH="$HOME/esp8266/esp-open-sdk/xtensa-lx106-elf/bin/:$PATH"
alias xgcc="xtensa-lx106-elf-gcc

/home/sviluppo/esp8266/nodemcu-firmware

export PATH="$HOME/esp8266/esp-open-sdk/xtensa-lx106-elf/bin/:$PATH"

alias xgcc="xtensa-lx106-elf-gcc

Then execute the following commands, with /dev/ttyUSB0 as COM port of the nodemcu dev kit

Flash erase

./tools/esptool.py --port /dev/ttyUSB0 --baud 9600 erase_flash 
./tools/esptool.py --port /dev/ttyUSB0  --baud 9600 write_flash -fm dio -fs 32m  0x3FE000 ./bin/blank.bin

1 2	./tools/esptool.py --port /dev/ttyUSB0 --baud 9600 erase_flash ./tools/esptool.py --port /dev/ttyUSB0 --baud 9600 write_flash -fm dio -fs 32m 0x3FE000 ./bin/blank.bin

Firmware upload

./tools/esptool.py --port /dev/ttyUSB0  --baud 9600 write_flash -fm dio -fs 32m 0x00000 ./bin/nodemcu_float.bin 0x3fc000 ./bin/esp_init_data_default.bin

1	./tools/esptool.py --port /dev/ttyUSB0 --baud 9600 write_flash -fm dio -fs 32m 0x00000 ./bin/nodemcu_float.bin 0x3fc000 ./bin/esp_init_data_default.bin

In the next article we’ll upload our custom LUA code on the nodemcu dev kit.

Lua sample code

Micro Devices

Tag Archives: nodemcu

ESP32 – Nodemcu firmware compiling

MQTT with BeagleBone and ESP8266 – MQTT on ESP8266 with Relay

MQTT with BeagleBone and ESP8266 – MQTT on ESP8266 with temperature sensor

Mqtt with Beaglebone and ESP8266-MQTT ESP8266

MQTT with BeagleBone and ESP8266 – Mosquitto installation on Beaglebone

Mqtt with Beaglebone and Esp8266-Architecture

Nodemcu Enduser_setup module lua sample(part2)

Nodemcu Enduser_setup module lua sample(part1)

Lua sample code for esp8266

How to upload nodemcu firmware with esptool

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