The TTP223 Touch Key Module is a compact capacitive touch sensor designed to replace traditional mechanical push buttons. It detects touch through direct contact or thin non-conductive surfaces, providing reliable and silent operation. This module is widely used in touch switches, control panels, home automation, consumer electronics, and DIY embedded projects due to its simplicity and low power consumption.
Core Sensor Specifications
• Sensor Type: Capacitive touch sensor
• Sensor IC: TTP223
• Touch Channels: 1
• Touch Method: Capacitive sensing
Electrical & Interface
• Operating Voltage: 2.0 V – 5.5 V
• Output Type: Digital (HIGH / LOW)
• Output Modes: Momentary or toggle (jumper configurable)
• Interface Pins: VCC, GND, OUT
• Response Time: Fast touch detection
Performance Characteristics
• Reliable touch detection
• No mechanical wear or noise
• Low power consumption
• Stable operation under normal conditions
Physical Characteristics
• Module Type: PCB-mounted touch sensor
• Touch Pad: Integrated copper pad
• Compact and lightweight design
• Suitable for enclosure mounting behind panels
Compatibility
• Arduino Uno / Nano / Mega
• ESP8266 / ESP32
• Raspberry Pi GPIO
• Touch-based user interfaces
• IoT and automation controllers
Key Advantages
• Replaces mechanical push buttons
• Works through thin plastic or acrylic
• Simple digital output
• Easy integration with microcontrollers
Technical Insights
• Sensitivity affected by pad size and enclosure thickness
• Ground plane improves stability
• Jumper pads allow mode configuration
• Avoid moisture exposure for best results
Applications
• Touch switches and lamps
• Home automation control panels
• Consumer electronics interfaces
• Interactive DIY projects
• Educational electronics kits
Pro Tip
• Test sensitivity before final enclosure assembly
• Use stable power supply for noise-free operation
• Avoid long signal wires
• Configure toggle mode for latching behavior
Package Includes
• 1 × TTP223 Touch Key Module