Capacitive Touch Switch Button Module TTP223 1 Key

Specifications

• Onboard IC: TTP223 Capacitive Touch Detector
• Operating Voltage: 2.5V to 5.5V DC
• Operating Current: ~1.5uA (low power mode), maximum 3.0mA
• Response Time: Fast mode: ~60ms 
• Detection Surface: 1-Key (Single Touch Pad)
• Trigger Output Settings: Configurable via Solder Jumpers (A and B)
• Default: Active High, Momentary
• PCB Dimensions: 15mm x 11mm
• Indicator: Built-in onboard red LED (lights up on touch)

Applications

• Smart Home Automation: Create invisible light switches concealed behind glass or acrylic panels.
• Interactive Displays: Build museum exhibits or school projects with durable, waterproof touch interfaces.
• Consumer Electronics Prototyping: Replace physical reset or power buttons in custom 3D-printed enclosures.
• Waterproof Panels: Perfect for bathroom mirrors or kitchen appliances where water makes mechanical switches unsafe.

 Unlock New Capabilities

• The Prerequisite: If you’ve mastered basic input using standard pushbuttons and handled software debouncing in Arduino...
• The Upgrade: This TTP223 module unlocks the ability to build enclosed, weatherproof, and debounce-free interfaces. You can hide the sensor completely behind a flat surface up to 3mm thick!
• The Effort Level: Beginner. You only need 3 jumper wires and any microcontroller. The TTP223 IC handles the complex capacitance math internally, giving you a simple digital HIGH/LOW signal.

Virtual Technician & Wiring Guide

• ⚠️ Safety Warning: Always ensure your power supply matches your microcontroller's logic level.
• Probots Logic-Safe: because it accepts 2.5V to 5.5V, you can safely power it directly from a 3.3V ESP32/Raspberry Pi or a 5V Arduino Uno without worrying about frying your sensitive logic pins or needing a level shifter!

Pinout Mapping:

• VCC: Connect to 3.3V or 5V on your Microcontroller
• GND: Connect to Ground (GND)
• SIG / I/O: Connect to any Digital Input Pin (e.g., D2 on Arduino)

 Package Includes:

• 1 x Capacitive Touch Switch Button Module TTP223 1 Key

Frequently Asked Questions (Technical FAQs)

• What is the maximum thickness of material the TTP223 can detect a touch through?
  It reliably detects touch through 2mm to 3mm of non-conductive materials like glass, acrylic, or plastic.
• Can I use the TTP223 module with a 3.3V ESP32?
  Yes, the operating voltage is 2.5V to 5.5V, making it fully compatible with 3.3V logic boards like ESP32 and Raspberry Pi.
• Does the TTP223 require software debouncing in my Arduino code?
  No, the TTP223 IC handles debouncing internally and outputs a clean digital signal.
• How do I make the TTP223 act like a toggle switch instead of a momentary button?
  Solder the two pads labeled "B" together. This puts the IC into self-locking (toggle) mode.
• How do I invert the logic so it outputs LOW when touched?
  Solder the two pads labeled "A" together. This changes the active trigger from HIGH to LOW.
• Will this touch sensor work if my finger is wet?
  Capacitive sensors can struggle with water droplets on the bare pad, but if mounted behind glass, it generally performs well with slight moisture.
• Can I connect the TTP223 directly to a 5V relay module without a microcontroller?
  Yes, if configured in toggle mode (Pad B closed), the SIG pin can trigger a standard 5V logic relay module directly.
• What does the onboard LED indicate?
  The onboard red LED lights up to provide visual feedback whenever a touch is successfully registered.
• Can I cut or file the PCB to make it smaller?
  No, cutting the PCB will sever the internal capacitive traces and destroy the module.
• Why is my TTP223 triggering randomly without being touched?
  Ghost triggers usually indicate noisy power supplies, floating grounds, or placing the sensor too close to electromagnetic interference (EMI) sources like motors.
• Does the TTP223 work through metal enclosures?
  No, capacitive touch sensors cannot detect fingers through conductive materials like metal. It only works through non-conductive dielectrics.
• Can I extend the touch area with a wire or copper foil?
  Yes, you can carefully solder a wire from the touch pad to a larger piece of copper tape to extend the capacitive sensing area.
• What is the standby current consumption of the TTP223?
  In its default low-power mode, the module consumes approximately 1.5 microamps (uA), making it excellent for battery-powered projects.
• Do I need an external pull-up or pull-down resistor on the SIG pin?
  No, the TTP223 has internal circuitry to manage the output state. You can read the digital pin directly.
• Can I use multiple TTP223 modules side-by-side?
  Yes, but leave at least 5mm of space between the touch pads to prevent cross-talk and accidental multi-triggering.
• How fast does the TTP223 register a touch?
  In fast mode, the response time is roughly 60ms. In low-power mode, it checks for touches every ~220ms.