Introduction

  • In this article, I will explain how to control Light/Fan using Arduino Mega 2560. Light and fan will be controlled by the potentiometer.
  • We can adjust the potentiometer and light and fan will be controlled by us.
Parts Of List
  • Arduino Mega 2560
  • Potentiometer
  • LED
  • Bread board
  • Hookup wires
Potentiometer:
  • It has three terminals.
  • It has a sliding or rotating contact that forms an adjustable voltage divider.
  • It acts as a variable resistor (or) rheostat.
    Figure 1: potentiometer
Connection:
Step 1: Potentiometer to ArduinoMega2560
The first pin of the potentiometer can be connected to the Gnd of the Arduino Mega 2560. The second pin of the potentiometer can be connected to the Analog pin A0 of the Arduino Mega 2560. The third pin of the potentiometer can be connected to the 5V of the Arduino Mega 2560.
Step 2: Connection From LED To Arduino Mega 2560
Postive pin = 06
Negative pin = Gnd
Programming
  1. const byte POTENTIOMETER = 0;
  2. const byte CONTROL = 6;
  3. int reading;
  4. int value;
  5. void setup()
  6. {
  7. pinMode(CONTROL, OUTPUT);
  8. }
  9. void loop()
  10. {
  11. reading = analogRead(POTENTIOMETER);
  12. value = map(reading, 0, 1024, 0, 255);
  13. analogWrite(CONTROL, value);
  14. }
Explanation:
  • Through this we can control Light /fan using potentiometer.
  • If we adjust the potentiometer on the decreasing side the light brightness decreases.
  • Also the fan speed also decreases.
  • If we adjust the potentiometer on the increasing side the light brightness increases.
  • Also the fan speed increased.
Output:
Figure 2: Output
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