Arduino - Button - Relay

We are going to learn how to:

We will learn how to toggle relay each time button is pressed in Arduino - Button Toggles Relay tutorial.

By connecting relay to light bulb, led strip, motor or actuator... We can use the button 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×Button
1×Relay
1×Warning Light Bright Waterproof
1×12V Power Adapter
1×Breadboard
n×Jumper Wires
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About Relay and Button

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

Wiring Diagram

Arduino Button 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-button-relay */ const int BUTTON_PIN = 7; // Arduino pin connected to button's pin const int RELAY_PIN = 3; // Arduino pin connected to relay's pin void setup() { Serial.begin(9600); // initialize serial pinMode(BUTTON_PIN, INPUT_PULLUP); // set arduino pin to input pull-up mode pinMode(RELAY_PIN, OUTPUT); // set arduino pin to output mode } void loop() { int buttonState = digitalRead(BUTTON_PIN); // read new state if (buttonState == LOW) { Serial.println("The button is being pressed"); digitalWrite(RELAY_PIN, HIGH); // turn on } else if (buttonState == HIGH) { Serial.println("The button is unpressed"); 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
  • Press and keep pressing the button several seconds
  • See the change of relay's state

Code Explanation

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

Button and Relay on Commercial Products

Most electronic products have a reset button. Additionally, the button also keeps other functionalities in many products.

  • Ring Video Doorbell with HD Video
  • Amazon Smart Speaker - Echo Dot
  • TP-Link AC1750 Smart WiFi Router - Dual Band Gigabit Wireless Internet Routers
  • Gaming Keyboard and Mouse
  • Wemo Smart Plug, WiFi Enabled, Works with Alexa, Google Assistant & Apple HomeKit

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