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Arduino - Motion Sensor - Servo Motor
We will learn:
- If the motion is detected, rotate servo motor to 90 degree
- If the motion is not detected, rotate servo motor back to 0 degree.
Hardware Required
Or you can buy the following sensor kit:
| 1 | × | DIYables Sensor Kit 30 types, 69 units |
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 Motion Sensor
If you do not know about servo motor and motion 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
Initial Setting
| Time Delay Adjuster | Screw it in anti-clockwise direction fully. |
| Detection Range Adjuster | Screw it in clockwise direction fully. |
| Repeat Trigger Selector | Put jumper as shown on the image. |
Arduino Code - Motion Sensor Controls Servo Motor
/*
* Created by ArduinoGetStarted.com
*
* This example code is in the public domain
*
* Tutorial page: https://arduinogetstarted.com/tutorials/arduino-motion-sensor-servo-motor
*/
#include <Servo.h>
// constants won't change
const int MOTION_SENSOR_PIN = 7; // Arduino pin connected to motion 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 lastMotionState; // the previous state of motion sensor
int currentMotionState; // the current state of motion sensor
void setup() {
Serial.begin(9600); // initialize serial
pinMode(MOTION_SENSOR_PIN, INPUT); // set arduino pin to input mode
servo.attach(SERVO_PIN); // attaches the servo on pin 9 to the servo object
servo.write(angle);
currentMotionState = digitalRead(MOTION_SENSOR_PIN);
}
void loop() {
lastMotionState = currentMotionState; // save the last state
currentMotionState = digitalRead(MOTION_SENSOR_PIN); // read new state
if (currentMotionState == LOW && lastMotionState == HIGH) { // pin state change: LOW -> HIGH
Serial.println("Motion detected!");
servo.write(90);
}
else
if (currentMotionState == HIGH && lastMotionState == LOW) { // pin state change: HIGH -> LOW
Serial.println("Motion stopped!");
servo.write(0);
}
}
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 your hand in front of sensor
- See the change of servo motor
Video Tutorial
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