Tag Archives: esp32

ESP32 – Nodemcu firmware compiling

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


The compilation documentation is available at the link


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

Clone the repository

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

Go into  nodemcu-firmware-esp32 folder and run

nodemcu-settingsEnable the bluetooth  in Component config–>Bluetooth

nodemcu-bluetoothEnable various modules in Component config–>Nodemcu modules

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

nodemcu-flashSave the configuration and exit. To build the firmware run

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

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


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

ESP32 – MicroPython compiling for ESP32

We begin now a series of articles about the Espressif ESP32 MCU

ESP32 Wifi-Bluetooth Module

After having analyzed in the previous articles  MicroPython  for ESP8266, in this we start to treat MicroPython on ESP32.

The following shows how to generate the MicroPython image from the source code for the ESP32 board.

The operating system 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 Micropython folder and inside this folder the  esp32 folder

The MicroPython source code is available at the following link

Github Micropython

Instructions to build the firmware for the ESP32 are available at the link

MicroPython esp32

Clone the repository

Go into  micropython/ports/esp32 folder


The command releases the git hash for the supported espidf

At the time of our compilation the result is as follows

Go into  /home/sviluppo/Micropython/esp32 folder and clone ESPIDF

Checkout with the hash obtained above


We follow the instructions at the link

Cross compiler

to install the cross compiler; install the prerequisites for building

Download the cross compiler

Create the  esp folder under /home/sviluppo/Micropython/esp32

Unpack the cross compiler in esp

Add the binary folder of the cross compiler to the PATH envinronment variable

Go into the following folder

and create the makefile file with the following code inside

Go into the micropython folder available in /home/sviluppo/Micropython/esp32


to add external dependencies.

Next step is the MicroPython cross compiler build

Finally we can build the ESP32  firmware with the following commands

The firmware is generated under ports/esp32/build with the name firmware.bin.

Proceed to load the firmware with the commands

In our case, the firmware upload was successful with the command

It is also possible to load the firmware.bin image with the commands

where  /dev/ttyXXX is replaced with the actual serial port to which we connect the ESP32 board.

In the next article we’ll compile the nodemcu firmware for ESP32

ESP32 – Nodemcu firmware compiling

ESP32 Wifi-Bluetooth Module

In this article we describe briefly the ESP32  chip from Espressif


This lower power SOC  contains a 32 bit MCU  with bluetooth and wifi modules. At the Espressif web site we can find the detailed informations about the ESP32

ESP32 Resources

The device datasheet is available in the following pdf document

ESP32 Datasheet

The ESP32 modules are available individually or in a development kits; the last system simplifies its usage as the development kit contains all the hardware to use rapidly the soc device; we are already ready to load the firmware and use the device.

On internet various web sites describe home automation or iot projects using this soc.

A reference site for the ESP32  is


At above link we can find the various development platforms utilized  for the ESP32. The most relevant  are

  • Arduino Ide

ESP32 Arduino



  • Micropython


  • PlatformIO


  • Firmware Lua



Nodemcu Development

We can buy the ESP32 modules/dev kits from various internet online websites, for example ebay

ESP32 on ebay

Different ESP32  modules are available from different vendors

Espressif esp-wroom-32

AI-Thinker esp32s

At the link


different hardware configurations available are listed.

As development kits we report

AI-Thinker NodeMCU-32S

DoIT ESP32 Dev Kit

There are development kits based on esp32 that also integrate a LORA wireless  module internally


We report for example the following

Heltec Wifi LoRa 32


In the next articles we’ll describe how to build firmwares and use the ESP32 MCU.