Touch Switch Digital Sensor TTP223B Module

TTP223B Digital Capacitive Touch Switch Sensor Module

Upgrade your projects with clean, modern interface controls using the TTP223B Digital Capacitive Touch Switch Sensor Module. This compact module acts as an elegant, wear-free alternative to traditional mechanical push buttons. It detects the proximity or touch of a human finger through thin layers of plastic, glass, or wood, allowing you to build fully sealed, waterproof, or hidden switch panels.

Based on the highly responsive TTP223B touch-detector IC, this module delivers fast, low-power performance and interfaces seamlessly with Arduino, ESP32, Raspberry Pi, and other popular microcontrollers.

Key Features

• Touch & Proximity Sensing: Detects light finger contact or close proximity. Can be mounted behind non-metallic surfaces (like glass or acrylic) to create seamless, invisible buttons.

• Low Power Consumption: Operates efficiently with a low standby current, making it perfect for battery-powered or portable electronics.

• Rapid Response Time: Delivers a quick response time of approximately $60\text{ms}$ in fast mode ($220\text{ms}$ in low-power mode), ensuring immediate feedback.

• Onboard Status LED: Features a built-in LED indicator that lights up instantly when a touch is detected, simplifying testing and troubleshooting.

• Simple 3-Pin Interface: Designed with clearly labeled pins (VCC, GND, and SIG/OUT) for quick and straightforward wiring.

Specifications

• Operating Voltage: $2.0\text{V}$ to $5.5\text{V}$ DC

• Output High State (VOH): ~ $0.8\times \text{VCC}$

• Output Low State (VOL): ~ $0.3\times \text{VCC}$

• Response Time: ~ $60\text{ms}$ (Fast mode), ~ $220\text{ms}$ (Low-power mode)

• Module Dimensions: Approx. $24\text{mm}\times 24\text{mm}$

• Default Output: Logic LOW when untouched, logic HIGH when touched (Momentary action).

Common Applications

• Replacing mechanical buttons and switches to eliminate wear and tear.

• Creating waterproof or sealed control panels for smart appliances and outdoor enclosures.

• Building hidden touch triggers or interactive museum displays behind glass panels.

• Interactive DIY electronics, robotics, and home automation projects.

Pro-Tip for Builders: You can easily alter the module’s behavior (e.g., toggling between momentary or latching switch modes, or changing the output active state to LOW) by soldering or bridging the tiny configuration pads labeled on the back of the PCB.