TECNOULAB 5pcs MPR121 Breakout V12 Module Capacitive Touch Sensor Controller Keyboard I2C

【MPR121】 MPR121 Breakout V12 Capacitive Touch Sensor Controller Module I2C Keyboard Module. The MPR121 is a capacitive touch sensor controller controlled by an I2C interface. The chip can control up to twelve individual electrodes, as well as a simulated thirteenth electrode. 【Compact Design】The MPR121 also features eight LED driving pins. When these pins are not set, they can be used to control the LEDs. There are four bridges at the bottom of the board, all of which are configured (closed) by default. 【High Performance】 A steering bridge joins the ADD pin to the ground, which means that the default I2C address of the chip will be 0x5A. If you need to change the direction of the chip (shortening ADD to a different pin), be sure to open the bridge first. 【High Performance】Jumpers also include SDA, SCL and switch pin to 10k pull-up resistors. If you do not need pull-up resistors, you can open the jumpers by cutting the trace. 【COMPATABILITY】 There is no regulation on the board, so the voltage supplied must be between 2.5 and 3.6 VDC. The VREG pin plugs into a 0.1uF capacitor to ground, which means that unless you modify the board, you cannot operate the MPR121 in the low supply voltage mode (1.71-2.75VDC).