mpr121-breakout-v12 Approaching Capacitive Touch Sensor Controller Keyboard Development Board
Description: This is a breakthrough for the scale mpr121qr2 plate. Yes mpr121 capacitive touch sensor controller via a I2C interface driver. The chip can control up to twelve electrodes, and an analog thirteenth electrode. The mpr121 also has eight LED drive pins. When these Pin no Configured to electrode , They can be used drive led .
There is a four athletes at the bottom of the board, all of which are set shut down by default. Form one address added relationship jumper pin to ground, meaning the chip on the default I2C address 0x5a. If you need to change the chip address Add to short by a different pin Make sure you first open jumper. Jumpers connect SCL and SDA, interrupt pin 10K pull-up resistor. If you do not need Pull-up resistor able to pass Cutting trace connection turn on Jumper .
Board has not provided, so the supplied voltage should be between 2.5 and 3.6vdc. That VREG By a pin 0.1uF Capacitor ground , this means connection , Unless you modify board , You can not in Low Supply Voltage Mode Operation mpr121 1.71-2.75vdc .
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