Goal: Control the brightness of the led using Aurdino and a potentiometer.

We achieve this by reading output potentiometer using analogRead with output range between 0 to 1023 and convert this into analog signal between 0 to 255, to do this we use a map function to transform the values 0 to 1023 to 0 to 255 and write to a pwm pin no 5.

void setup() {
// put your setup code here, to run once:
Serial.begin(9600);
pinMode(5,OUTPUT);
pinMode(A0,INPUT);
}

void loop() {
// put your main code here, to run repeatedly:
int sensorValue = analogRead(A0);
int outputValue = map(sensorValue, 0, 1023, 0, 255);
//Write Output value to pwm pin 5
analogWrite(5,outputValue);
// print out the value you read:
Serial.println(sensorValue);
delay(1);
}