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ELECTRONICS

TTP223 Touch Switch for Raspberry Pi GPIO Control

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UPDATED 2026-08-13
TYPECircuit
USE-CASETtp223 Touch Switch
EXAMPLETTP223 Touch Switch for Raspberry Pi GPIO Control
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CASE ANALYSIS

Scenario

A TTP223 capacitive touch module is powered from the Raspberry Pi 3.3V rail, and its active-high output drives a GPIO pin through a series resistor while a pulldown resistor keeps the pin low when untouched.

Key decisions

  • Use the Raspberry Pi 3.3V header supply to stay within GPIO voltage tolerance.
  • Add a 100k pulldown on the GPIO input so the pin reads low when the touch pad is idle.
  • Use a 1k series resistor to protect the GPIO pin from transient output conditions.

When to reuse this

Reusable for any 3.3V MCU GPIO when wiring a TTP223 active-high touch switch module with a local bypass capacitor and output conditioning.

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