SparkFun Capacitive Touch Keypad ‐ MPR121
SEN-12017 RoHS
Description: 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. If you are using a board which only accepts 5V
logic, you will run into a problem. You will want to use a logic level converter, or a board which
accepts 3.3V logic.
https://www.sparkfun.com/products/12017 5‐16‐17
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