Touch Sensor TP223

Touch Sensor TP223

Sensors
DET691
Part.No: TP223
€1.95
Last items in stock
Immediate Dispatch
TP223 capacitive touch sensor module — a compact, reliable alternative to mechanical switches for Arduino, ESP32, Raspberry Pi, and other microcontroller projects.

 

The TP223 Touch Sensor (MPN: TP223) is a compact capacitive touch sensor module that detects the change in capacitance caused by a human finger touch and outputs a digital signal. It is designed as a modern, reliable alternative to traditional mechanical push buttons, offering silent, wear-free operation with minimal footprint — ideal for any maker or engineer looking to add touch input to their build.

Key Features

  • Capacitive Touch Detection: Senses human touch through capacitance change → no physical pressure required, no mechanical wear
  • Digital Output: Outputs a clean HIGH/LOW signal → directly readable by any microcontroller digital pin
  • Compact Module: Small PCB form factor → fits easily into tight enclosures and prototypes
  • Drop-in Switch Replacement: 3-pin interface (VCC, GND, SIG) → simple wiring, no extra components needed
  • Low Power Consumption: Efficient TP223 IC → suitable for battery-powered projects

Pinout & Wiring

PINSymbolDescription
1VCCPower supply positive
2GNDGround
3SIG / OUTDigital output signal (HIGH on touch)

Wiring note: Connect VCC to your board's 3.3V or 5V pin, GND to ground, and SIG to any digital input pin. No pull-up resistor is required — the module includes onboard circuitry.

Compatibility

  • Arduino UNO / Nano (5V): Fully compatible — connect VCC to 5V, read SIG on any digital pin.
  • ESP32 / ESP8266 (3.3V): Fully compatible — connect VCC to 3.3V; the 3.3V output level is safe for ESP GPIO inputs.
  • Raspberry Pi (3.3V GPIO): Compatible — use 3.3V supply and connect SIG directly to a GPIO pin.

Typical Applications

  • Touch-activated lighting: Replace a wall switch with a silent capacitive pad to toggle LEDs or relay-controlled lamps.
  • DIY prototypes & smart home: Add touch buttons to custom enclosures without drilling holes for mechanical switches.
  • Robotics: Use as a touch-sensitive bumper input or user interface element on a robot chassis.
  • Interactive displays: Trigger animations or screen transitions in Arduino/ESP32-based display projects.
  • Wearables & compact devices: Integrate a touch interface into small, battery-powered enclosures where space is limited.

Technical Specifications

SpecificationValue
InterfaceDigital output (SIG)
Operating Voltage2.0V – 5.5V
Output LogicHIGH on touch, LOW idle (default)
ICTP223
MPNTP223

FAQ

Q: Can the TP223 work through a thin plastic or acrylic cover?
A: Yes. The capacitive sensing works through non-conductive materials up to a few millimetres thick, making it suitable for sealed enclosures.

Q: Does the output stay HIGH while I hold my finger, or does it toggle?
A: By default the TP223 module outputs HIGH as long as touch is detected (momentary mode). Some modules include solder pads to configure toggle (latching) mode — check your specific board.

Package Contents: 1 × TP223 Touch Sensor Module

⚠ Note: Keep the touch pad area free from moisture and conductive contaminants for reliable detection. Avoid touching the underside of the PCB during operation to prevent false triggers.
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