TTP229 16-way Capacitive Touch Switch

The TTP229 16-way Capacitive Touch Switch is a digital module that replaces mechanical 4×4 keypads with 16 touch-sensitive pads.Quick Specs

• Voltage: 2.4V to 5.5V DC (supports Arduino, ESP32, Raspberry Pi)
• Current: Under 2.5 A in low-power standby mode
• Response: 100ms in fast mode; 200ms in low-power mode

Key Features

• 8-Key Mode (Default): Uses 8 direct parallel pins; keys 916 are inactive.
• 16-Key Serial Mode: Uses a 2-wire serial protocol (SCL/SDO) to read all 16 keys while saving microcontroller pins. It requires setting an onboard jumper.
• Overlays: Works through thin glass, plastic, or acrylic for waterproof panels.

Critical Rule

• Auto-Calibration: Do not touch the pads for 0.5 seconds after powering up. It calibrates baseline capacitance automatically; early touch causes false triggers.