Arduino Based Control LED Light Circuit with Potentiometer

Want to make an LED glow bright or dim just by turning a knob? then this simple Arduino Based Control LED Light Circuit with Potentiometer does that same thing.

Turn the knob to adjust the LED light from soft to full brightness, also it is a fun and easy way to learn how Arduino reads analog signals.

Additionally, it also shows how PWM controls the LED light intensity.

Arduino Code:

int potPin = A0;
int ledPin = 9;
int potValue = 0;
int ledValue = 0;

void setup() {
pinMode(ledPin, OUTPUT);
}

void loop() {
potValue = analogRead(potPin);
ledValue = map(potValue, 0, 1023, 0, 255);
analogWrite(ledPin, ledValue);
delay(10);
}

Coding Explanation:

• PotPin read analog value from potentiometer between 0 and 1023.
• Map function change this value to range 0 to 255.
• AnalogWrite send PWM signal to LED pin 9.
• When we turn potentiometer, voltage also change.
• This change make LED bright or dim.

Circuit Working:

Parts List:

Components	Values	Quantity
Resistors	220Ω 1/4 watt	1
	Potentiometer 10k	1
Semiconductors	Arduino UNO Board	1
	LED any color	1

To begin with, when the potentiometer rotates, its resistance changes and changes the voltage on analog pin A0; after that, the Arduino reads this voltage and generates a PWM output.

Then PWM controls the average current through the LED, so the LED becomes dim or bright.

How to Build:

To build a Arduino Based Control LED Light Circuit with Potentiometer follow the below collection steps:

• First, take all the parts as shown in circuit diagram above.
• Next, connect the potentiometer middle pin to analog pin A0 of Arduino.
• Then connect the left pin of the potentiometer to 5V.
• After that, connect the right pin of the potentiometer to GND.
• Now connect the LED positive leg (anode) to digital pin 9 through a 220 ohm resistor and finally, connect the LED negative leg (cathode) to GND of Arduino.

Conclusion:

Overall, this Arduino Based Control LED Light Circuit with Potentiometer is a simple way to control LED brightness, also it helps to learn about analog input and PWM output in Arduino.

Furthermore, we can use this in small light dimmer projects or sensor control projects.