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LCD
Product Description
An ultra-miniature digital capacitive touch sensor module designed to replace traditional mechanical pushbuttons, ideal for sleek interface design and touchless control panels in Arduino and ESP32 projects. Powered by the efficient TTP223-BA6 dedicated touch detector IC, this compact hardware key responds to changes in localized capacitance, triggering instantly when a finger approaches or contacts the target surface. It features a clean, solder-bridge configurable design on the rear side, allowing users to switch the output logic between active-high and active-low, or toggle between momentary action and a latching (on/off) switch state. Operating smoothly over low current with zero mechanical wear, it can be seamlessly integrated behind thin sheets of non-metallic materials like glass, plastic, or acrylic for completely sealed, waterproof user interfaces.
Pinout / Layout Connections
The module routes its logic signals and power lines via a compact 3-pin interface bank:
VCC Pin: Power supply input, accepts DC +2.0V to +5.5V.
GND Pin: Common system ground (0V) reference.
I/O Pin: Digital output signal terminal. Outputs the touch state based on solder pad configurations (Default: momentary active-high logic out).
Solder Pad Customization Matrix
The backend of the board contains two solder bridges (A and B) that alter its fundamental output state:
| Pad configuration | Mode Type | Output Logic State |
| A Open, B Open | Momentary | Active-HIGH (Default State) |
| A Shorted, B Open | Momentary | Active-LOW |
| A Open, B Shorted | Toggle (Latching) | Power-up state LOW, toggles on touch |
| A Shorted, B Shorted | Toggle (Latching) | Power-up state HIGH, toggles on touch |
Applications
Sealed Control Interfaces: Perfect for building waterproof keypad clusters, hygienic medical switches, and dustproof smart home appliance overlays.
Hidden Trigger Switches: Excellent for embedding interactive buttons hidden directly beneath plastic panels or wooden tabletops for clean product designs.
Interactive Robotics Controls: Ideal for serving as rapid-response touch bumpers or menu selection keys on mobile rovers and desktop terminal interfaces.
Compatibility
The TTP223 Touch Key Module operates over a wide voltage span and handles direct digital I/O lines effortlessly, ensuring full compatible deployment with:
Arduino Board Series (Uno, Nano, Mega, Pro Micro) utilizing simple
digitalRead()functions.ESP32 and ESP8266 development boards (Fully compatible with 3.3V GPIO input configurations).
Raspberry Pi and Raspberry Pi Pico modules.
Direct Logic Control Loops to drive standalone high-current logic MOSFETs or relay modules without an intervening MCU.
Technical Specifications
| Parameter | Value / Specification |
| Core Detector IC | TTP223-BA6 TonTouch Series |
| Operating Input Voltage | DC 2.0 V to 5.5 V |
| Response Travel Time | Fast Mode: ~60 ms, Low Power Mode: ~220 ms (at 3V supply) |
| Active Current Load | ~1.5 $\mu$A to 3.0 $\mu$A idle, up to 7.0 $\mu$A when active |
| Board Footprint Size | Ultra-compact 15 mm x 11 mm layout |
| Isolation Capacity | Triggers through up to ~5mm of non-metallic glass or plastic substrate |
What’s in the Box
1 x TTP223 Touch Key Module.
