The M5Stack 16-Key Capacitive Touch Unit is a Makey Makey-inspired input device built around an ATmega328P microcontroller. It detects capacitive touch across 16 key pads, allowing you to turn everyday objects — fruit, foil, water, or anything conductive — into touch-sensitive buttons. A built-in buzzer provides audio feedback for each key press.

The unit connects to M5Stack Core devices via the Grove A port (I2C, address 0x51) and is programmable using Arduino IDE or UIFlow (Blockly/Python). Two Lego-compatible mounting holes are included for easy integration into builds.

Key Features

• 16 Capacitive Touch Keys – Each key responds to conductive objects or skin contact
• ATmega328P Controller – Onboard processing with upgradeable firmware
• Built-in Buzzer – Audio tone feedback for each key (fruit piano, etc.)
• Grove A (I2C) – Connects to M5Stack Core via I2C at address 0x51
• Multi-Platform Development – Arduino IDE and UIFlow (Blockly/Python)
• Lego Compatible – Two mounting holes for Lego integration

Pin Mapping (Grove A)

• GPIO22 – SCL
• GPIO21 – SDA
• 5V – Power
• GND – Ground

Ideal For

• Fruit pianos and interactive music projects
• Creative input devices using everyday objects
• STEM education and capacitive touch experiments
• M5Stack-based interactive installations

Package Contents

• 1× 16-Key Capacitive Touch Unit (MEGA328P)
• 1× Grove cable

Resources

• Makey Firmware (GitHub)
• Arduino Example Code (GitHub)
• UIFlow Example (GitHub)