The TTP223B Digital Capacitive Touch Sensor is a modern, reliable alternative to traditional mechanical push-buttons. At Electrapac, we recommend this sensor for creators looking to build sleek, "buttonless" interfaces or hidden switches that work through plastic, glass, or wood.

Product Overview

The TTP223B is a dedicated touch-sensing IC designed for single-key touch detection. Because it is a capacitive sensor, it detects the electrical properties of the human body. This allows it to function even if placed behind a non-metallic waterproof barrier, making it ideal for high-durability or outdoor projects where physical buttons might wear out or let in moisture.

Key Features for Electrapac Customers

• Invisible Mounting: The sensor can be mounted behind a thin sheet of acrylic, glass, or plastic. This allows you to create completely flat, waterproof control panels.

• Low Power Consumption: With a typical current draw of just a few microamps in standby, it is perfect for battery-operated devices and long-term IoT applications.

• Self-Calibration: The TTP223B automatically recalibrates its environment. If the sensor is powered on with something touching it, it will adjust its baseline to maintain accurate detection.

• Configurable Modes: The module features solder jumpers (usually labeled A and B) that allow you to change the behavior:

  • Momentary: Output is active only while being touched.

  • Toggle (Latching): Touch once to turn ON, touch again to turn OFF.

• Stable Digital Signal: Provides a clean, "debounced" digital output that can be connected directly to an Arduino, ESP32, or a relay driver without extra components.

Wiring & Usage Guide

The Electrapac TTP223B module features three simple pins for quick integration:

1. VCC: Connect to 2.0V – 5.5V (Standard 3.3V or 5V works best).

2. GND: Connect to common ground.

3. SIG (Out): Digital Output—goes HIGH when the pad is touched (default setting).

Pro-Tip: If you are mounting this behind a panel, ensure there is no air gap between the sensor's touch pad and the material (use thin double-sided adhesive). Metal or conductive materials near the sensor can cause interference or "ghost touches."

Primary Applications

• Waterproof Control Panels: Replacing physical buttons on kitchen appliances or outdoor keypads.

• Hidden Switches: Creating "secret" touch points under a wooden desk or behind a plastic casing to turn on lights.

• Interactive Art: Making touch-sensitive installations or LED lamps that change color with a tap.

• Replacement for Mechanical Switches: Eliminating "contact bounce" and wear-and-tear in high-use equipment.

• Touchless (Near-Touch) Sensors: Sensing a finger even before it makes physical contact with the surface.

Why Shop at Electrapac?

We supply the Original TTP223B Modules with high-quality PCBs and clear silkscreen labeling for easy identification. Visit us at www.electrapac.com for the modern switching solutions that give your projects a professional, high-tech finish.