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.
- This is a breakout board for MPR121QR2. The MPR121 is a capacitive touch sensor controller driven by an I2C interface
- The chip can control up to twelve individual electrodes, as well as a simulated thirteenth electrode
- The MPR121 also features eight LED driving pins. When these pins are not configured as electrodes, they may be used to drive LEDs
- There are four jumpers on the bottom of the board, all of which are set (closed) by default
- An address jumper ties the ADD pin to ground, meaning the default I2C address of the chip will be 0x5A. If you need to change the address of the chip (by shorting ADD to a different pin), make sure you open the jumper first.
- You can’t operate the MPR121 in low-supply voltage mode (1.71-2.75VDC) Size: approx.30mm*20mm*3mm.