4P/3P Interface Dual-Side Touch Switch Sensor Module – High Sensitivity TouchPad for Electronics

Description

The 4P/3P Interface Dual-Side Touch Switch Sensor Module is a capacitive touch sensing board designed for contactless switching in electronics projects. Unlike standard single-sided touch modules, this variant features a double-sided touch pad, allowing touch detection from either face of the PCB—making it suitable for installations where the sensor is mounted behind a panel or where both sides are accessible.

The module provides two interface options: a standard 2.54mm 3-pin header (VCC, GND, SIG) for breadboard and Arduino use, and a 4-pin Grove-compatible connector for plug-and-play integration with Grove systems . This dual-interface design makes it adaptable to different prototyping ecosystems without soldering or adapters.

The output logic is active-low: when no touch is detected, the digital output is VDD (HIGH); when the touch pad is pressed, the output drops to 0V (LOW) . This is the opposite of some TTP223 modules (which default to active-high), so verify the logic before connecting to your microcontroller. The module operates from 3.3V to 5V DC with very low current consumption (approximately 18µA at 5V), making it suitable for battery-powered and embedded applications .

Critical limitations: This module uses a capacitive touch sensing element (likely TTP223-based, though the exact IC is not explicitly stated in available listings). It provides a digital HIGH/LOW output only—not analog touch-strength measurement. Metal objects near the touch pad can cause false triggers. The output can only source/sink a few milliamps—use a transistor or relay for higher-current loads.

Features

• Dual-Side Touch Pad: Detects touch from either face of the PCB for flexible mounting.

• Dual Interface (3-Pin & 4-Pin Grove): Compatible with standard 2.54mm headers and Grove connectors .

• Active-Low Output: Output is HIGH (VDD) when untouched, LOW (0V) when touched .

• Wide Operating Voltage (3.3V–5V): Compatible with Arduino, ESP32, and most platforms.

• Ultra-Low Power Consumption: ~18µA at 5V, suitable for battery-powered designs .

• Compact PCB with Mounting Holes: 38.3 × 24mm board with M2 screw holes for secure installation .

• No Mechanical Wear: Capacitive sensing has no moving parts, ideal for sealed enclosures.

• Touch-Through-Panel Capable: Can detect touch through thin non-metallic materials like plastic or glass.

Technical Specifications