MPR121 Capacitive Touch Sensitive Keypad Module MPR121

Description

Switches are one of the most widely used components in electronics.A keypad is a set of keys or buttons arranged in a block. This capacitor touch keypad includes 12 keys and MPR121 IC on the back of the PCB.

The MPR121 capacitive keypad uses the MPR121 and 12 touch sensitive pads to give you a simple 'keypad' with an I2C output. These keypads function by measuring the capacitance of twelve electrode points. When an object comes close to the electrode connector, the measured capacitance changes. This signals the MPR121 that something has touched a button. The board also has four mounting holes allowing it to be used as an input system in place of traditional buttons. This keypad outputs 3.3V logic.