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Arduino - Light Sensor Triggers Servo Motor
In this tutorial, We are going to learn how to use light sensor and Arduino to control the servo motor. In detail, Arduino reads value from a light snesor:
- If the light sensor's analog value is greater than a threshold, Arduino rotates the servo motor to 90 degree
- If the light sensor's analog value is lower than a threshold, Arduino rotates the servo motor back to 0 degree.
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 Light Sensor
If you do not know about servo motor and light sensor (pinout, how it works, how to program ...), learn about them in the following tutorials:
Wiring Diagram
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Arduino Code - Analog Threshold
/*
* Created by ArduinoGetStarted.com
*
* This example code is in the public domain
*
* Tutorial page: https://arduinogetstarted.com/tutorials/arduino-light-sensor-triggers-servo-motor
*/
#include <Servo.h>
// constants won't change
const int LIGHT_SENSOR_PIN = A0; // Arduino pin connected to light sensor's pin
const int SERVO_PIN = 9; // Arduino pin connected to Servo Motor's pin
const int ANALOG_THRESHOLD = 500;
Servo servo; // create servo object to control a servo
void setup() {
servo.attach(SERVO_PIN); // attaches the servo on pin 9 to the servo object
servo.write(0);
}
void loop() {
int analogValue = analogRead(LIGHT_SENSOR_PIN); // read the input on analog pin
if (analogValue > ANALOG_THRESHOLD)
servo.write(90); // rotate servo motor to 90 degree
else
servo.write(0); // rotate servo motor to 0 degree
}
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
- Rotate the light sensor
- See the change of servo motor
Video Tutorial
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