Interfacing TTP223 Touch Sensor with Arduino

Written by Amir Mohammad Shojaei

TTP223 Capacitive Touch Sensor Features

The TTP223 sensor can be used in a wide range of applications such as smartphones and tablets. It can also detect from behind glass and thin surfaces. When a finger touches the sensor, the module output gets HIGH, and immediately switches to LOW if not touched.

The operating voltage is 2 to 5.5 V. Its maximum response time is 220 milliseconds.

You can download the datsheet of this module here.

TTP223 Capacitive Touch Sensor Datasheet

1 file(s) 235.57 KB

Download

TTP223 Capacitive Touch Sensor Pinout

This Module has 3 pins:

VCC: Module power supply – 2 to 5.5 V
GND: Ground
SIG: Digital output

You can see the pinout of this module on the first side in the image below.

Required Materials

Hardware Components

Arduino UNO R3	×	1
TTP223 Capacitive Touch Sensor	×	1
Male to Female jumper wire	×	1

Software Apps

Arduino IDE

Note

You need to provide only one of these sensors.

Interfacing TTP223 Capacitive Touch Sensor with Arduino

Step 1: Circuit

The following circuit shows how you should connect Arduino to TTP223 sensor. Connect wires accordingly.

Step 2: Code

Upload the following code to Arduino.

/*
  TTP223B-Capacitive-Touch-Switch-Module
  made on 21 oct 2020
  by Amir Mohammad Shojaee @ Electropeak
  Home

*/
const int SENSOR_PIN = 2; 

// Variables will change:
int lastState =LOW;      
int currentState;
         
void setup() {
  
  Serial.begin(9600);
  // initialize the Arduino's pin as aninput
  pinMode(SENSOR_PIN, INPUT);
}

void loop() {
  // read the state of the the input pin:
  currentState = digitalRead(SENSOR_PIN);

  if(lastState == HIGH && currentState == LOW)
    Serial.println("Sensor is touched");

  // save the the last state
  lastState = currentState;
}

When the digital output changes from LOW to HIGH, “Sensor is Touched ” appears in Serial Monitor.

The code output is as follows. As you can see, the sensor has been touched 4 times.

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Interfacing TTP223 Touch Sensor with Arduino