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M5 - ESP32 experiments with M5Stack devices

Introduction

This is my collection of experiments using ESP32 devices from M5Stack, e.g. the Atom Matrix.

Some highlights:

  • AtomMatrixVernie : controlling a Lego Boost robot (e.g. Vernie) wireless with an ESP32 Atom Matrix and its accelerometer

  • HubEmulation : ESP32 Atom Matrix behave as a Lego Boost Move Hub, controllable e.g. with the Lego Powered Up app on mobile phone

  • Wiimote : using a Nintendo Wii Remote/Nunchuk as wireless input device for ESP32 (e.g. to control a robot)

Some examples use forked libraries with modifications/enhancements, that you can find in my other repositories.

PlatformIO

I use PlatformIO and VS code with the Arduino framework under Windows 10. All examples are part of a single PlatformIO workspace. It should also be possible to open the individual examples/folders directly in the Arduino IDE.

ini file

My platformio.ini files support the Arduino-style folder structure. Here is an example for the AtomMatrix:

[platformio]
src_dir = .

[env:atom-matrix]
platform = espressif32
board = m5stick-c
framework = arduino
;build_flags = -fpermissive
monitor_speed = 115200

ENV variables

Additionally, I use some environment variables for global folders, instead of defining them in every ini file:

ENV variable path
PLATFORMIO_LIB_EXTRA_DIRS e.g. c:\pio\extra_libs
PLATFORMIO_BUILD_DIR e.g. c:\temp\pio_build
PLATFORMIO_LIBDEPS_DIR e.g. c:\temp\pio_libs

Alternatively, one could set those directories directly in the platformio.ini file:

lib_extra_dirs = c:\pio\extra_libs
build_dir      = c:\temp\pio_build
libdeps_dir    = c:\temp\pio_libs