【MPR121】 MPR121 Breakout V12 Capacitive Touch Sensor Controller Module I2C Keyboard Module 【Design compact】 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, 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; 【High performance】 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; Jumpers also cont SDA, SCL and the switch pin to 10k pull-up resistors;
If you do not require the pull-up resistors you can open the jumpers by cutting the trace conting them; 【COMPATABILITY】 There is no regulation on the board, so the voltage supplied should be between 2.5 and 3.6VDC; The VREG pin is conted through to 0.1uF capacitor to ground, which means, unless you modify the board, you can not operate the MPR121 in low-supply voltage mode 1.71-2.75VDC; 【Fast delivery】 Fast and high quality delivery of Spain buying in TECNOIOT.
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