Capacitive touch button with blue LED backlight: a touch key with no mechanical parts and a white diffusing surface that lights up blue to confirm the touch. Based on the TTP223 chip, it runs from 2.7V to 6V and provides a digital output ready for Arduino, ESP32, Raspberry Pi and relay modules: ideal for light switches, control panels and home automation projects.
Key features
- Touch control: no moving parts, no wear
- Blue LED backlight under the diffusing surface
- Dedicated TTP223 capacitive sensing chip with automatic calibration
- Works at both 3.3V and 5V
- 3-pin 2.54mm pitch header already soldered
- Compact 16.7 x 20.7mm size
Technical specifications
- Chip: TTP223
- Power supply: 2.7V to 6V DC
- Output: digital, high level about 3.3V
- LED color: blue
- Connection: 3 pins (VCC, GND, OUT), 2.54mm pitch
- Dimensions: 16.7 x 20.7mm (measured)
- Operating temperature: -30 °C to +70 °C
Pinout
| Pin | Function | Arduino connection |
|---|
| VCC | Power 2.7-6V | 5V (or 3.3V) |
| GND | Ground | GND |
| OUT | Touch digital output | A digital pin, e.g. D2 |
Usage tips
- Do not touch the button for about half a second after power-up: the chip calibrates to its surroundings
- Before writing the sketch, check how the output behaves (active only while touched or toggling at each touch) with an LED or by reading it with digitalRead()
- OUT is a logic signal: for lamps, LED strips or 230V loads use a relay module or a transistor
- Always connect the module GND to the microcontroller GND
- Keep metal parts away from the sensing surface: they can disturb detection
- Combine it with buttons of other colors to tell the functions of a panel apart at a glance
Package contents
- 1 touch button (module with 3-pin header)
Typical uses
- Light switches and home automation
- Control panels with Arduino and ESP32
- Lamps and decorative projects
- Replacing mechanical buttons in DIY devices
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