analogIn.ino

// constants for the pins
const int ledPin = 2;
const int potPin = A7;

void setup() {
  // set the led pin as an output
  pinMode(ledPin, OUTPUT);
  
  // open the serial port for communication
  Serial.begin(9600);
  
  while(!Serial){
    ;; // do nothing until the serial port opens
  }
}

void loop() {
  // read the value of the pin and store it
  // this will be in a range of 0-1023
  int potVal = analogRead(potPin);
  // print the value to the monitor
  Serial.print("pot value: ");
  Serial.print(potVal);

  // map the value to the range of analogOut
  // store that in a new variable
  int ledVal = map(potVal, 0, 1023, 0, 255);
  // print the value to the monitor
  Serial.print(", mapped value: ");
  Serial.println(ledVal);  

  // write the value to the LED
  analogWrite(ledPin, ledVal);

  // give the ADC a moment to rest
  delay(10);
}

pic.md