MPR121(CAPACITIVE TOUCH SENSOR MODULE)

The MPR121 Capacitive Touch Sensor Module controls up to 12 individual touch electrodes (plus a simulated 13th) via I2C. Also has 8 LED-driving pins usable when not configured as electrodes. Default I2C address 0x5A (ADD tied to GND via onboard jumper). SDA, SCL, and interrupt pin have 10k pull-up resistors via jumpers (cut to remove). Compatible with Arduino, ESP32, Raspberry Pi, and any I2C microcontroller.

Specifications:

• IC: MPR121
• Interface: I2C
• Default I2C Address: 0x5A
• Touch Channels: 12 (+ 1 virtual)
• LED Drive Pins: 8
• Supply Voltage: 2.5–3.6V
• Pull-ups: 10k on SDA, SCL, IRQ (jumper-selectable)

Applications:

• Touch-sensitive keyboards and pads
• Capacitive button arrays for HMI interfaces
• Touch-controlled lighting and interactive art
• Proximity sensing