Add a variety of touch sensors to your next microcontroller project with this easy-to-use 12-channel capacitive touch sensor breakout board featuring the MPR121. This chip supports up to 12 individual touchpads with plug-and-play STEMMA QT connector and large alligator clip-friendly pads. Also, it is a solderless solution for capacitive touch sensing. The MPR121 supports reading data over I2C, which can be implemented with almost any microcontroller. You can choose one of two addresses with the ADDR pin (solder it shut for the alternate address), for a total of 24 capacitive touchpads on an I2C 2-wire bus. Using this chip is much simpler than capacitive sensing with analog inputs, as it does all the filtering for you and can be configured for more or less sensitivity. To make it as easy.