/*
The Goal: Using the map() function, we will control
 6 LEDs' PWM value, by slicing the incoming value
 from a potentiometer.
 */

int LEDpins[] = {
  3,5,6,9,10,11};// an array of the PWM pins
int PWMvals[6];// an array of the PWM values: 0-255, initialized in setup()
int potVal = 0;// potentioter value: 0-1023
int LEDpotValWindow;

int numLEDs = 6;// number of LEDs

void setup(){
  for(int i = 0; i < numLEDs; i++){
    //pinMode( LEDpins[i], OUTPUT);
    PWMvals[i] = 0;
  }
  Serial.begin(9600);
  LEDpotValWindow = 1023 / numLEDs;
}

void loop(){
  // first thing is to grab the potentiometer value
  potVal = analogRead(A0);

  // now we want to turn on only the leds that should be lit
  // and then only as much as they should be lit.

  // if statement for 1st LED
  if( potVal < LEDpotValWindow){
    PWMvals[0] = map(potVal, 0, LEDpotValWindow, 0, 255);
  }
  else{
    PWMvals[0] = 255;
  }
  analogWrite(LEDpins[0], PWMvals[0]);

  // if statement for 2nd LED
  if( potVal > LEDpotValWindow && potVal < ( LEDpotValWindow * 2) ){
    PWMvals[1] = map(potVal, LEDpotValWindow, LEDpotValWindow * 2, 0, 255);
  }
  else if(potVal > ( LEDpotValWindow * 2)) {
    PWMvals[1] = 255;
  }
  else{
    PWMvals[1] = 0;
  }
  analogWrite(LEDpins[1], PWMvals[1]);

  // if statement for 3rd LED
  if( potVal > ( LEDpotValWindow * 2) && potVal < ( LEDpotValWindow * 3) ){
    PWMvals[2] = map(potVal, LEDpotValWindow * 2, LEDpotValWindow * 3, 0, 255);
  }
  else if(potVal > ( LEDpotValWindow * 3)) {
    PWMvals[2] = 255;
  }
  else{
    PWMvals[2] = 0;
  }
  analogWrite(LEDpins[2], PWMvals[2]);

  // if statement for 4th LED
  if( potVal > ( LEDpotValWindow * 3) && potVal < ( LEDpotValWindow * 4) ){
    PWMvals[3] = map(potVal, LEDpotValWindow * 3, LEDpotValWindow * 4, 0, 255);
  }
  else if(potVal > ( LEDpotValWindow * 3)) {
    PWMvals[3] = 255;
  }
  else{
    PWMvals[3] = 0;
  }
  analogWrite(LEDpins[3], PWMvals[3]);

  // if statement for 5th LED
  if( potVal > ( LEDpotValWindow * 4) && potVal < ( LEDpotValWindow * 5) ){
    PWMvals[4] = map(potVal, LEDpotValWindow * 4, LEDpotValWindow * 5, 0, 255);
  }
  else if(potVal > ( LEDpotValWindow * 5)) {
    PWMvals[4] = 255;
  }
  else{
    PWMvals[4] = 0;
  }
  analogWrite(LEDpins[4], PWMvals[4]);

  // if statement for 5th LED
  if( potVal > ( LEDpotValWindow * 5) && potVal < ( LEDpotValWindow * 6) ){
    PWMvals[5] = map(potVal, LEDpotValWindow * 5, LEDpotValWindow * 6, 0, 255);
  }
  else if(potVal > ( LEDpotValWindow * 6)) {
    PWMvals[5] = 255;
  }
  else{
    PWMvals[5] = 0;
  }

  analogWrite(LEDpins[5], PWMvals[5]);
}