Table of Contents
Creating a light intensity controller using Arduino allows for precise management of lighting systems. This guide provides step-by-step instructions to build a simple and effective device for controlling light levels based on user input or sensor data.
Components Needed
- Arduino board (Uno, Mega, etc.)
- Photoresistor (LDR)
- Potentiometer
- LED or lighting device
- Resistors (10kΩ for LDR, 220Ω for LED)
- Breadboard and jumper wires
Hardware Setup
Connect the photoresistor in a voltage divider configuration with a resistor. Connect the junction to an analog input pin on the Arduino. Connect the LED to a digital PWM pin through a resistor. Use the breadboard and jumper wires to make all connections securely.
Programming the Arduino
Write a program to read the light level from the photoresistor and adjust the LED brightness accordingly. Use the analogRead() function to get sensor data and the analogWrite() function to control the LED. Implement a simple control algorithm to maintain desired light levels.
Sample Code
“`cpp const int sensorPin = A0; const int ledPin = 9; int sensorValue = 0; void setup() { pinMode(ledPin, OUTPUT); Serial.begin(9600); } void loop() { sensorValue = analogRead(sensorPin); int brightness = map(sensorValue, 0, 1023, 0, 255); analogWrite(ledPin, brightness); Serial.println(sensorValue); delay(100); } “`