/*
  Blink
  Turns on an LED on for one second, then off for one second, repeatedly.

  Most Arduinos have an on-board LED you can control. On the UNO, MEGA and ZERO 
  it is attached to digital pin 13, on MKR1000 on pin 6. LED_BUILTIN takes care 
  of use the correct LED pin whatever is the board used.
  If you want to know what pin the on-board LED is connected to on your Arduino model, check
  the Technical Specs of your board  at https://www.arduino.cc/en/Main/Products
  
  This example code is in the public domain.

  modified 8 May 2014
  by Scott Fitzgerald
  
  modified 2 Sep 2016
  by Arturo Guadalupi

  modified 29 Apr 2018
  by David Arias

  Change of to pin 0, corresponding to pin 13 in the Attiny44a.
*/

int analogPin = 3;     // potentiometer wiper (middle terminal) connected to analog pin 3
                       // outside leads to ground and +5V
int val = 0; 

// the setup function runs once when you press reset or power the board
void setup() {
  // initialize digital pin LED_BUILTIN as an output.
  pinMode(7, OUTPUT);
  pinMode(3, INPUT);
}

// the loop function runs over and over again forever
void loop() {
  val = analogRead(analogPin);
  val = map(val, 0, 1023, 0, 255);
  analogWrite(7, val);
  //digitalWrite(0, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(20);                       // wait for a second
  //digitalWrite(0, LOW);    // turn the LED off by making the voltage LOW
  //delay(val);   
  // wait for a second
}