Capacitive Touch Switch Button Module TTP223 for Arduino Raspber

Specifications

• Operating Voltage: 2.0V to 5.5V DC (Compatible with both 3.3V and 5V logic).
• IC Chip: TTP223
• Response Time: ~60ms (Fast mode) / ~220ms (Low power mode).
• Standby Current: Extremely low, ~1.5uA (ideal for battery-powered projects).
• Output Level: Digital High/Low.
• Dimensions: 15mm x 11mm (Ultra-compact footprint).
• Indicator: Onboard red LED illuminates upon touch detection.

       Solder Pad Configurations (A & B):

• Default (Open/Open): Active High, Momentary mode.
• Pad A Closed: Active Low, Momentary mode.
• Pad B Closed: Active High, Toggle (Self-locking) mode.
• Pad A & B Closed: Active Low, Toggle (Self-locking) mode.

Applications

• Interactive Displays & Kiosks: Create sleek, flat-panel interfaces without drilling holes for physical buttons.
• Hidden Switches: Mount the sensor behind acrylic, glass, or thin wood to create "magic" invisible switches.
• Waterproof Enclosures: Control your outdoor electronics safely without compromising the waterproof seal with mechanical buttons.
• Smart Home Devices: Build custom touch-activated LED lamps or relay controllers.

Unlock New Capabilities

• If you've mastered: Basic tactile push-buttons and simple LED toggling.
• This product unlocks: Wear-free, aesthetic user interfaces and hidden "secret" triggers that sense through non-metallic materials.
• Effort Level: Beginner (5-10 minutes).
• Requirements: Just 3 jumper wires and any standard microcontroller (Arduino, Raspberry Pi, ESP32).

Virtual Technician & Wiring Guide

• ⚠️ Safety Warning: Ensure your power supply is stable. Capacitive sensors calibrate their baseline capacitance upon power-up. Do not touch the sensor pad while powering it on, or it may falsely calibrate and fail to detect subsequent touches.

       Standard Wiring (Microcontroller):

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

Package Contents:

• 1 x TTP223 Capacitive Touch Switch Module Button Self-Lock Module

Frequently Asked Questions (FAQ)

• How does the TTP223 touch sensor work?
  It measures the change in electrical capacitance when a human finger (which acts as a conductor) comes near the sensor pad, triggering a digital output.
• Can the TTP223 detect touch through plastic or glass?
  Yes, it can easily detect touch through non-metallic materials like glass, acrylic, and thin wood, usually up to 2-3mm thick depending on the material.
• What is the operating voltage of the TTP223 module?
  It operates across a wide range of 2.0V to 5.5V DC, making it perfectly safe for both 3.3V (ESP32, Raspberry Pi) and 5V (Arduino Uno) systems.
• How do I change the TTP223 from momentary to toggle mode?
  By default, the sensor only outputs HIGH while you are touching it. To make it act like a toggle switch (touch once for ON, touch again for OFF), you need to bridge the solder pad labeled 'B' with a small drop of solder.
• What does the 'A' solder pad on the TTP223 do?
  Solder pad 'A' changes the active logic level. Open (default) means it outputs HIGH when touched. If you bridge pad 'A' with solder, it will output LOW when touched.
• What does the 'B' solder pad on the TTP223 do?
  Solder pad 'B' controls the switching mode. Open (default) is momentary mode (like a keyboard key). Bridged is toggle/self-locking mode (like a light switch).
• Why is my TTP223 sensor constantly triggering on its own?
  This is usually caused by an unstable power supply (noisy voltage), or because the sensor was touched during its initial power-up calibration sequence. Restart the module without touching it.
• Is the TTP223 compatible with ESP32 and ESP8266?
  Yes, absolutely. Since it supports 3.3V logic natively, you can connect the SIG pin directly to any ESP32/ESP8266 GPIO without needing a logic level converter.
• Does the TTP223 module require an external pull-up resistor?
  No, the module outputs a strong digital HIGH or LOW signal on its own. You do not need external pull-up or pull-down resistors; just use standard pinMode(pin, INPUT).
• How much power does the TTP223 consume in standby mode?
  It is incredibly power-efficient, drawing only about 1.5 microamps (uA) in standby mode at 3.3V, making it excellent for battery-powered IoT nodes.
• Can I use the TTP223 to control a 5V relay directly?
  No. While the TTP223 outputs a 5V signal (if powered by 5V), it cannot source enough current to drive a relay coil directly. You must connect the SIG pin to a transistor or a relay module with a built-in optocoupler/driver.
• How do I wire the TTP223 to an Arduino Uno?
  Connect VCC to the Arduino's 5V pin, GND to the Arduino's GND, and SIG to any digital pin (e.g., Pin 2). Read the state using digitalRead(2).
• Does the TTP223 work with a 3.3V logic level?
  Yes, simply power the VCC pin with 3.3V, and the SIG pin will output a safe 3.3V logic high, perfectly matching Raspberry Pi and STM32 boards.
• Can I adjust the sensitivity of the TTP223 module?
  Yes, but it requires advanced SMD soldering. You can increase sensitivity by adding a small capacitor (0~50pF) to the vacant pad usually labeled 'C' or by removing the default onboard capacitor on the traces.