/*
   Potentiometer-dimmed LED Bar
   ------------------------

   Dims LEDs connected to digital pins based on the value obtained
   from a 10k potentiometer connected to analog pin A2.

   Created November 2015
   Joshuah Jest

*/

#define NUMREADINGS 6 // Number of readings (increase for a slow curve)
#define minPot 0// Min resistance
#define maxPot 600  // Max resistance
 
const int firstLED = 2;
const int lastLED = 11;
int leds;
int readings[NUMREADINGS];
int index = 0;
int total = 0;
int average = 0;
int resistance = 0;
 
int x = 0;
int y = 0;
 
void setup() {
    for (int r = 0; r < NUMREADINGS; r++) {
        readings[r] = 0;
    }
    for (int p = firstLED; p <= lastLED; p++) {
        pinMode(p, OUTPUT);
    }
    leds = (lastLED - firstLED) + 1;
}
 
void loop() {
    total -= readings[index];
    readings[index] = analogRead(2);
    total += readings[index];
    index++;
 
    if (index >= NUMREADINGS) {
       index = 0;
    }
 
    average = abs(total / NUMREADINGS);       // ((1024 * 300) / 1000) = ~338
    resistance = map(average, minPot, maxPot, 0, leds);
 
    for (int ledON = firstLED; ledON < (firstLED + resistance); ledON++) {
        digitalWrite(ledON, HIGH);
    }
 
    for (int ledOFF = (firstLED + resistance); ledOFF <= lastLED; ledOFF++) {
        digitalWrite(ledOFF, LOW);
    }
}