Arduino - Touch Sensor - Relay

We are going to learn how to:

We will learn how to toggle relay each time touch sensor is touched in Arduino - Touch Sensor Toggles Relay tutorial.

By connecting relay to light bulb, led strip, motor or actuator... We can use the touch sensor to control light bulb, led strip, motor or actuator...

Hardware Required

1×Arduino UNO or Genuino UNO
1×USB 2.0 cable type A/B
1×Touch Sensor
1×Relay
1×Warning Light Bright Waterproof
1×12V Power Adapter
n×Jumper Wires
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About Relay and Touch Sensor

If you do not know about relay and touch sensor (pinout, how it works, how to program ...), learn about them in the following tutorials:

Wiring Diagram

Arduino Touch Sensor Relay Wiring Diagram

Image is developed using Fritzing. Click to enlarge image

Arduino Code

/* * Created by ArduinoGetStarted.com * * This example code is in the public domain * * Tutorial page: https://arduinogetstarted.com/tutorials/arduino-touch-sensor-relay */ const int TOUCH_SENSOR_PIN = 7; // Arduino pin connected to touch sensor's pin const int RELAY_PIN = 3; // Arduino pin connected to the IN pin of relay void setup() { Serial.begin(9600); // initialize serial pinMode(TOUCH_SENSOR_PIN, INPUT); // set arduino pin to input mode pinMode(RELAY_PIN, OUTPUT); // set arduino pin to output mode } void loop() { int touchState = digitalRead(TOUCH_SENSOR_PIN); // read new state if (touchState == HIGH) { Serial.println("The sensor is being touched"); digitalWrite(RELAY_PIN, HIGH); // turn on } else if (touchState == LOW) { Serial.println("The sensor is untouched"); digitalWrite(RELAY_PIN, LOW); // turn off } }

Quick Steps

  • Connect Arduino to PC via USB cable
  • Open Arduino IDE, select the right board and port
  • Copy the above code and open with Arduino IDE
  • Click Upload button on Arduino IDE to upload code to Arduino
  • Arduino IDE Upload Code
  • Touch and keep touching the touch sensor several seconds
  • See the change of relay's state

Code Explanation

Read the line-by-line explanation in comment lines of source code!

Video Tutorial

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Touch Sensor and Relay on Commercial Products

  • Touch Control Table Lamp
  • Touch Kitchen Faucets
  • Touch Control Table Lamp with Wireless Charger and USB Charging Port
  • Gaming Keyboard and Mouse
  • Wemo Smart Plug, WiFi Enabled, Works with Alexa, Google Assistant & Apple HomeKit

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