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:

Hardware Required

1×Arduino UNO or Genuino UNO
1×USB 2.0 cable type A/B
1×Light Sensor
1×10 kΩ resistor
1×Servo Motor
1×Jumper Wires
1×(Optional) 9V Power Adapter for Arduino
1×(Recommended) Screw Terminal Block Shield for Arduino Uno
1×(Optional) Transparent Acrylic Enclosure For Arduino Uno

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 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

Arduino Light Sensor Servo Motor Wiring Diagram

This image is created using Fritzing. Click to enlarge image

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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