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Capacitive Touch Sensor (TTP223)

A solid-state touch button — no moving parts; output goes HIGH on touch.

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How it works

A capacitive touch sensor detects the tiny change in capacitance when your finger nears its pad — so it acts like a button with nothing to press, and it even works through a thin non-metal panel.

The common TTP223 module has three pins and drives its output HIGH when touched. Solder jumpers on the back switch it between momentary/toggle modes and active-high/low. Add a short delay in code as a simple debounce.

Pins

VCC
To 2–5.5V.
GND
To GND.
SIG / OUT
To a digital pin — HIGH on touch.

Ratings

Voltage
2.0–5.5 V
Output
Active-HIGH (default)

Tips

  • Works behind thin plastic/acrylic — handy for sealed enclosures.
  • Use the solder jumpers to pick momentary vs. toggle behavior.