Features: 1The MPR121 is a capacitive touch sensor controller driven by an I2C interface. 2The chip can control up to 12 individual electrodes and a simulated thirteenth electrode. 3The MPR121 also has eight LED drive pins. When these pins are not configured as electrodes, they may be used to drive the LEDs. 4There are four jumpers at the bottom of the board, all of which are set (off) by default. 5The address jumper grounds the ADD pin, which means the chip's default I2C address is 0x5A. If you need to change the chip address (by shorting the ADD to a different pin), make sure you turn on the jumper first. 6The jumper is also connected to SDA, and the SCL and interrupt pins are connected to 10k pull-up resistors. 7If you don't need pull-up resistors, you can turn on the jumpers by cutting off the traces that connect them. The supply voltage should be between 2.5 and 3.6 VDC. 8The VREG pin is connected to ground through a 0.1uF capacitor, which means that the MPR121 cannot be operated in low supply voltage mode (1.71-2.75VDC) unless you modify the board. Package included: 2 x Sensor2 x Pin Header