esp-idf-mpr121

MPR121 Capacitive Touch Driver for esp-idf.

I ported from here.

Software requirements

ESP-IDF V4.4/V5.x.
ESP-IDF V5.0 is required when using ESP32-C2.
ESP-IDF V5.1 is required when using ESP32-C6.

Hardware requirements

MPR121 Capacitive Touch switch.

Installation

git clone https://github.com/nopnop2002/esp-idf-mpr121
cd esp-idf-mpr121
idf.py set-target {esp32/esp32s2/esp32s3/esp32c2/esp32c3/esp32c6}
idf.py menuconfig
idf.py flash

Configuration

Wirering

MPR121		ESP32	ESP32-S2/S3	ESP32-C2/C3/C6
SCL	--	GPIO19	GPIO12	GPIO6
SDA	--	GPIO18	GPIO11	GPIO5
IRQ	--	GPIO15	GPIO18	GPIO4
GND	--	GND	GND	GND
VCC	--	3.3V	3.3V	3.3V

__Note:__It is recommended to add external pull-up resistors for SDA/SCL pins to make the communication more stable, though the driver will enable internal pull-up resistors.

You can change it to any pin using menuconfig.

Screen Shot

Supports multiple simultaneous touches.

I (55786) MAIN: electrode 0 was just touched
I (55786) MAIN: electrode 1 was just touched
I (55786) MAIN: electrode 2 was just touched
I (55786) MAIN: electrode 3 was just touched
I (58446) MAIN: electrode 0 was just released
I (58446) MAIN: electrode 1 was just released
I (58446) MAIN: electrode 2 was just released
I (58446) MAIN: electrode 3 was just released

How to use this component in your project

Create idf_component.yml in the same directory as main.c.

YourProject --+-- CMakeLists.txt
              +-- main --+-- main.c
                         +-- CMakeLists.txt
                         +-- idf_component.yml

Contents of idf_component.yml.

dependencies:
  nopnop2002/mpr121:
    path: components/mpr121
    git: https://github.com/nopnop2002/esp-idf-mpr121.git

When you build a projects esp-idf will automaticly fetch repository to managed_components dir and link with your code.

YourProject --+-- CMakeLists.txt
              +-- main --+-- main.c
              |          +-- CMakeLists.txt
              |          +-- idf_component.yml
              +-- managed_components ----- nopnop2002__mpr121

Reference

https://github.com/nopnop2002/esp-idf-ttp229