Adafruit 12-Key Capacitive Touch Sensor Breakout - MPR121 [STEMMA QT]
![Adafruit 12-Key Capacitive Touch Sensor Breakout - MPR121 [STEMMA QT] — Adafruit — 1982](/_next/image?url=https%3A%2F%2Ftfvg9prl3arlawj9.public.blob.vercel-storage.com%2Fparts%2Fcatalogue-visuals%2Fpublic-missing-line-art-20260602%2Fadafruit-1982-adafruit-12-key-capacitive-touch-sensor-breakout-mpr121-1a6ab01cd0f5-AJ5h84MpDuAeHFonghERrvbsgPP1sO.png%3Fv%3Dbc68f20-dirty&w=3840&q=75)
Pinout
- VIN
Required
Type · PowerVoltage · 3.3V - GND
Required
Type · Ground - SDA
Required
Type · I2C - SCL
Required
Type · I2C
| Pin | Type | Function | Voltage |
|---|---|---|---|
| VIN | Power | Required | 3.3V |
| GND | Ground | Required | |
| SDA | I2C | Required | |
| SCL | I2C | Required |
Pin details
4 connections- VIN
Required
PowerVoltage · 3.3V - GND
Required
Ground - SDA
Required
I2C - SCL
Required
I2C
Start wiring
I2C · SPI · Single data line · 3.3 – 5 V · Breakout
Confirm the data interface matches your host board.
Module pins: VIN, GND, SDA, SCL. Schematik maps them to your board in the app.
Touch
13 other optionsMPR121, CAP1188, CAP1203 Qwiic slider and AT42QT breakouts are sensor ICs for electrodes you wire yourself. Simple single-pad modules like the TTP223B give you one digital output with no bus required.
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