GitHub - mcauser/micropython-mpr121: MicroPython driver for MPR121 capacitive touch keypads and breakout boards

MicroPython driver for MPR121 capacitive touch keypads and breakout boards.

Compatible with:

These boards use 3.3V logic, so you would want to use a logic level converter with this for 5V systems.

Examples

Copy the file to your device, using ampy, webrepl or compiling and deploying. eg.

Basic usage

from machine import Pin, I2C
import mpr121
import time

i2c = I2C(scl=Pin(5), sda=Pin(4))
mpr = mpr121.MPR121(i2c, 0x5A)

while True:
	print(mpr.touched())
	time.sleep_ms(100)

For more detailed examples, see /examples

Parts

MPR121 Capacitive Touch Keypad $2.88 AUD
Female-Female Dupont wires $0.64 AUD
VCC-GND STM32F407VET6 mini $15.47 AUD
TinyPICO $20.00 USD
Wemos D1 Mini $5.20 AUD

Connections

VCC GND STM32F407VET6 Mini

from machine import I2C
import mpr121
i2c = I2C(3)
mpr = mpr121.MPR121(i2c, 0x5A)

MPR121	STM32F407VET6
VCC	3V3 (or 5V)
IRQ	D3 (optional)
SCL	A8 (SCL)
SDA	C9 (SDA)
GND	GND

I2C(1) SCL=B6, SDA=B7
I2C(2) SCL=B10, SDA=B11
I2C(3) SCL=A8, SDA=C9

TinyPICO (ESP32)

from machine import Pin, I2C
import mpr121
i2c = I2C(scl=Pin(22), sda=Pin(21))
mpr = mpr121.MPR121(i2c, 0x5A)

MPR121	TinyPICO ESP32
VCC	3V3
IRQ	GPIO32 (optional)
SCL	GPIO22 (SCL)
SDA	GPIO21 (SDA)
GND	GND

Wemos D1 Mini (ESP8266)

from machine import Pin, I2C
import mpr121
i2c = I2C(scl=Pin(5), sda=Pin(4))
mpr = mpr121.MPR121(i2c, 0x5A)

MPR121	D1 Mini ESP8266
VCC	3V3
IRQ	D3 (optional)
SCL	D1 GPIO5 (SCL)
SDA	D3 GPIO4 (SDA)
GND	GND

License

Licensed under the MIT License.