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Arduino - Door Sensor - Servo Motor
We will learn:
- If the door is open, rotate servo motor to 90 degree
- If the door is open again, rotate servo motor back to 0 degree.
That process is repeated.
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 Servo Motor and Door Sensor
If you do not know about servo motor and door sensor (pinout, how it works, how to program ...), learn about them in the following tutorials:
Wiring Diagram
This image is created using Fritzing. Click to enlarge image
Arduino Code - Door Sensor Controls Servo Motor
/*
* Created by ArduinoGetStarted.com
*
* This example code is in the public domain
*
* Tutorial page: https://arduinogetstarted.com/tutorials/arduino-door-sensor-servo-motor
*/
#include <Servo.h>
// constants won't change
const int DOOR_SENSOR_PIN = 7; // Arduino pin connected to door sensor's pin
const int SERVO_PIN = 9; // Arduino pin connected to servo motor's pin
Servo servo; // create servo object to control a servo
// variables will change:
int angle = 0; // the current angle of servo motor
int lastDoorState; // the previous state of door sensor
int currentDoorState; // the current state of door sensor
void setup() {
Serial.begin(9600); // initialize serial
pinMode(DOOR_SENSOR_PIN, INPUT_PULLUP); // set arduino pin to input pull-up mode
servo.attach(SERVO_PIN); // attaches the servo on pin 9 to the servo object
servo.write(angle);
currentDoorState = digitalRead(DOOR_SENSOR_PIN);
}
void loop() {
lastDoorState = currentDoorState; // save the last state
currentDoorState = digitalRead(DOOR_SENSOR_PIN); // read new state
if(lastDoorState == LOW && currentDoorState == HIGH) {
Serial.println("The door-opening event is detected");
// change angle of servo motor
if(angle == 0)
angle = 90;
else
if(angle == 90)
angle = 0;
// control servo motor arccoding to the angle
servo.write(angle);
}
}
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. Repeat this several times
- See the change of servo motor
Video Tutorial
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