About using the ESP32 with HomeDing

The HomeDing library is compatible to the ESP32 Arduino environment.

Specific to ESP32 are the following features:

• Usually there are no other names for the GPIO pins and GPIO numbers from the processor descriptions are used.

• An exception is the Arduino Nano ESP32 having printed pin numbers that differ from the GPIO numbers.

• The Touch Element allows using the ESP32 built-in touch features on the GPIO pins.

• The MY9291 Element only works with ESP8266 by the used library.

TODO:

• Wakeup / low power consumption in board.cpp
• PMSElement
• Tone Element for ESP32
  • https://www.thomascountz.com/2021/02/21/arduino-tone-for-esp32
  • https://github.com/Dlloydev/ESP32-ESP32S2-AnalogWrite
  • https://www.pschatzmann.ch/home/2021/01/07/esp32-tone/

See also

• https://lastminuteengineers.com/esp32-arduino-ide-tutorial/

Boards Overview from espressif:

https://www.espressif.com/en/products/devkits

https://www.studiopieters.nl/esp32-pinout/

ESP32 specific topics

• ESP32 Arduino Core documentation:

  • https://docs.espressif.com/projects/arduino-esp32/en/latest/index.html
  • https://espressif-docs.readthedocs-hosted.com/projects/arduino-esp32/en/latest/installing.html

• The ESP32 uses partitions to structure the flash memory. The Arduino environment supports a fixed layout that cannot be changed easily.

  • https://blog.espressif.com/how-to-use-custom-partition-tables-on-esp32-69c0f3fa89c8

• Setup the development with Arduino:

  • https://docs.espressif.com/projects/arduino-esp32/en/latest/installing.html
  • https://randomnerdtutorials.com/installing-the-esp32-board-in-arduino-ide-windows-instructions/

• A ESP32 specific troubleshooting guide with so me helpful tips on how to setup the dev environment.

  • https://randomnerdtutorials.com/esp32-troubleshooting-guide/

• Setup Espressif IDF

  • https://docs.espressif.com/projects/esp-idf/en/latest/get-started/windows-setup.html

• https://www.esp32.com/viewtopic.php?t=6383

• https://github.com/Deous/VSC-Guide-for-esp32

• https://github.com/botofancalin/Esp32_debug_template

Auto Upload Probelms

Uploading a new firmware via the USB interface does not work fully automatically on some boards as expected. This is caused by a timing problem with the EN signal (RST).

If you can upload by using the manual reset sequence (Press Boot, Press and release EN, Release Boot) adding a 10µF capacitor to EN and GND may help.

![ESP32 on breadboard with EN capacitor]

See also https://electronics.stackexchange.com/questions/569788/how-esp32-auto-upload-issue-has-been-fixed-by-adding-capacitor

Projects

• https://github.com/schreibfaul1/ESP32-audioI2S

Blogs and Infos

• http://esp32.net/

Modules

• esp32 DevKits 30, 36 and 38 pin versions with WROOM module
• ESP32 Camera Module
• esp32 azure iot kit

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