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Arduino - Door Sensor - LED
We are going to learn how to:
- Turn on LED if the door is open.
- Turn off LED if the door is closed.
We will learn how to toggle LED each time door is closed in Arduino - Door Sensor Toggles LED tutorial.
Hardware Required
Or you can buy the following sensor kits:
| 1 | × | DIYables Sensor Kit (30 sensors/displays) | |
| 1 | × | DIYables Sensor Kit (18 sensors/displays) |
Please note: These are Amazon affiliate links. If you buy the components through these links, We will get a commission at no extra cost to you. We appreciate it.
About LED and Door Sensor
If you do not know about LED and door sensor (pinout, how it works, how to program ...), learn about them in the following tutorials:
Wiring Diagram
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Arduino Code
/*
* Created by ArduinoGetStarted.com
*
* This example code is in the public domain
*
* Tutorial page: https://arduinogetstarted.com/tutorials/arduino-door-sensor-led
*/
const int DOOR_SENSOR_PIN = 9; // Arduino pin connected to the OUTPUT pin of door sensor
const int LED_PIN = 3; // Arduino pin connected to LED's pin
int doorState;
void setup() {
Serial.begin(9600); // initialize serial
pinMode(DOOR_SENSOR_PIN, INPUT_PULLUP); // set arduino pin to input pull-up mode
pinMode(LED_PIN, OUTPUT); // set arduino pin to output mode
}
void loop() {
doorState = digitalRead(DOOR_SENSOR_PIN); // read state
if (doorState == HIGH) {
Serial.println("The door is open");;
digitalWrite(LED_PIN, HIGH); // turn on LED
} else {
Serial.println("The door is closed");
digitalWrite(LED_PIN, LOW); // turn off LED
}
}
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
- Move the magnet close to the reed switch and them move it far from the reed switch.
- See the change of LED's state
Code Explanation
Read the line-by-line explanation in comment lines of source code!
Video Tutorial
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