• Capacitive Touch Sensor 12 Way

Capacitive Touch 12 Key Breakout (I2C Interface)

Add lots of touch sensors to your next microcontroller project with this easy-to-use 12-channel capacitive touch sensor breakout board, starring the MPR121. This chip can handle up to 12 individual touch pads. The MPR121 has support for only I2C, which can be implemented with nearly any microcontroller. You can select one of 4 addresses with the ADDR pin, for a total of 48 capacitive touch pads on one I2C 2-wire bus. Using this chip is a lot easier than doing the capacitive sensing with analog inputs: it handles all the filtering for you and can be configured for more/less sensitivity.  Getting started is a breeze with our Arduino library and tutorial. You'll be up and running in a few minutes, and if you are using another microcontroller, its easy to port our code.


Touch Sensor, Adafruit, 1982

Quick Spec

  • Dimensions: 33mm x 19mm x 2mm 
  • Weight: 2.2g
  • Uses I2C 7-bit address 0x5A (can be set to 0x5B, 0x5C or 0x5C)

Pinouts


Touch Sensor - 12 channel

The little chip in the middle of the PCB is the actual MPR121 sensor that does all the capacitive sensing and filtering. We add all the extra components you need to get started, and 'break out' all the other pins you may want to connect to onto the PCB.

The sensor on the breakout requires 3V power. Since many customers have 5V microcontrollers like Arduino, we tossed a 3.3V regulator on the board. Its ultra-low dropout so you can power it from 3.3V-5V just fine.

Pins

  • Vin - Since the chip uses 3 VDC, we have included a voltage regulator on board that will take 3-5VDC and safely convert it down.
  • 3Vo - this is the 3.3V output from the voltage regulator, you can grab up to 100mA from this if you like
  • GND - common ground for power and logic

I2C Pins

  • SCL - I2C clock pin, connect to your microcontrollers I2C clock line.
  • SDA - I2C data pin, connect to your microcontrollers I2C data line.

IRQ and ADDR Pins

ADDR is the I2C address select pin. By default this is pulled down to ground with a 100K resistor, for an I2C address of 0x5A. You can also connect it to the 3Vo pin for an address of 0x5B, the SDA pin for 0x5C or SCL for address 0x5D IRQ is the Interrupt Request signal pin. It is pulled up to 3.3V on the breakout and when the sensor chip detects a change in the touch sense switches, the pin goes to 0V until the data is read over i2c

Resources

Shipping List

  • 1 x Capacitive Touch Sensor 12 Way


Capacitive Touch Sensor 12 Way

  • Brand: Adafruit
  • Product Code: AF1982
  • Stock

    Warehouse Stock Status Location
    Centurion Out Of Stock B18
    Stellenbosch Out Of Stock B18
  • R199.00 (Inc Tax: R228.85)


Tags: capacitive, touch sensor, 12 key, breakout, sensor, touch