Arduino - Door Sensor Toggle Relay
In a previous tutorial , We have learned how to turn on the relay if the door is open, and turn off relay if the door is closed. In this tutorial, We are going to learn how to toggle relay each time door is closed.
By connecting relay to light bulb, led strip, motor or actuator... We can use the door sensor to toggle light bulb, led strip, motor or actuator...
|1||×||Arduino UNO or Genuino UNO|
|1||×||USB 2.0 cable type A/B|
|1||×||Warning Light Bright Waterproof|
|1||×||12V Power Adapter|
About Relay and Door Sensor
If you do not know about relay and door sensor (pinout, how it works, how to program ...), learn about them in the following tutorials:
Image is developed using Fritzing. Click to enlarge image
Arduino Code - Door Sensor Toggles Relay
- 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
- Move the magnet close to the reed switch and them move it far from the reed switch. Repeat this several times
- See the change of relay's state
Read the line-by-line explanation in comment lines of code!
In the code, relayState = !relayState is equivalent to the following code: