TTP223 Touch Key Module (Red Mini Capacitive Touch Switch Board)
Ditch traditional mechanical buttons and transition to sleek, wear-free solid-state controls with the industrial-grade TTP223 Touch Key Module. Powered by the highly responsive TTP223 capacitive touch detector integrated circuit, this ultra-compact module senses the proximity of a human finger to act as a seamless, bounce-free digital trigger switch.
Because it operates purely on changes in electrical capacitance, this touch key requires zero physical pressure to actuate. It is heavily insulated against environmental wear and tear, allowing it to function flawlessly even when hidden behind sheets of plastic, acrylic, or glass. It serves as the definitive choice for concealed smart home hidden switches, waterproof automation panels, and rugged consumer interactive electronics.
Key Features
Zero-Pressure Proximity Actuation: Registers a crisp, bounce-free digital trigger signal the instant a finger nears or lightly contacts the isolated on-board sensing pad.
Hidden/Concealed Mount Capability: Highly sensitive design allows the module to be permanently mounted beneath wood, glass, or plastic surfaces up to 3 millimeters thick, creating completely invisible touch panels.
Onboard Configuration Pads (A and B): Features two unpopulated jumper solder pads that let you change the sensor's functional logic behavior on the fly:
Pad A: Switches between Active High output logic and Active Low output logic.
Pad B: Toggles the board between momentary pulse mode (stays on only while touched) and self-locking toggle mode (touch once for ON, touch again for OFF).
Low Power Consumption Grid: Draws negligible standby current, making it highly efficient for continuous-monitoring battery-powered devices.
Instant Visual Feedback LED: Equipped with a bright onboard SMD status indicator that lights up immediately whenever a valid touch is registered.
Technical Specifications
Feature | Specification |
Core Touch Chipset | High-Stability TTP223 Capacitive Sensing IC |
Operating Voltage | 2.0V to 5.5V DC |
Response Time | Fast Mode: Approx. 60 milliseconds | Low Power Mode: Approx. 220 milliseconds |
Default Configuration | Momentary Output, Active High Logic (No Jumpers Closed) |
Output Type | Direct Digital Level Output (TTL Logic Level) |
Maximum Sensing Depth | Up to 3 mm (Depending on the overlay material thickness) |
Board Dimensions | 15 mm x 11 mm x 3 mm |
Hardware Wiring & Interface Mapping
The module features a simple 3-pin layout that integrates effortlessly with development boards like Arduino, ESP32, STM32, and Raspberry Pi:
VCC: Connects to the +2.0V to +5.5V DC power supply rail.
GND: System Ground Reference.
I/O (Digital Output): Connects straight to any digital input or hardware interrupt pin on your microcontroller.
Default State: Outputs a LOW level (0V) in standby, jumping to a HIGH level (VCC) the millisecond the sensor is touched.
Common Applications
Waterproof Appliance Interfaces: Install beneath sealed acrylic sheets to create completely waterproof control buttons for marine rigs, kitchen appliances, or outdoor hardware.
Concealed Smart Home Automation: Hide behind drywall or wooden furniture panels to create secret touch-activated toggles that turn on room lights, fans, or hidden compartments.
Interactive Toy & Robot Triggers: Serve as bumper switches on autonomous robots or touch-activated inputs on custom mechanical installations.
Mechanical Button Replacements: Upgrade high-use control panel keys to eliminate the long-term risk of mechanical spring failure, dust accumulation, and contact wear.
💡 Operating Configuration Guide: To customize the behavior of your touch key, carefully bridge the onboard A and B pads with a bead of solder using these settings:A Open, B Open: Momentary Mode, Active High Output (Default out of the box).A Open, B Closed: Toggle/Latch Mode, Active High Output (Touch ON / Touch OFF).A Closed, B Open: Momentary Mode, Active Low Output.A Closed, B Closed: Toggle/Latch Mode, Active Low Output.
Package Includes:
1 x TTP223 Touch Key Module (Single-Channel Breakout Board)