/*  LED bar graph: Richard 07/16/2024
  Turns on a series of LEDs based on the value of an analog sensor.
  you can use any number by changing the LED count and the pins in the
  array. can be used to control any series of digital outputs that depends
  on an analog input.
  The circuit:  LEDs from pins 2 through 11 to ground
  https://www.arduino.cc/en/Tutorial/BuiltInExamples/BarGraph
*/

// pot input reading and number of leds being used
const int analogPin = A0;   
const int ledCount = 10;  

int ledPins[] = {2, 3, 4, 5, 6, 7, 8, 9, 10, 11};  

void setup() {
  // iterate the pin array and set to output
  for (int current = 0; current < ledCount; current++) {
    pinMode(ledPins[current], OUTPUT);
  }
}

void loop() {
  // read the potentiometer
  int sensorReading = analogRead(analogPin);
  // map the result to a range from 0 to the number of LEDs
  int ledLevel = map(sensorReading, 0, 1023, 0, ledCount);

  // loop over the LED array
  for (int thisLed = 0; thisLed < ledCount; thisLed++) {
    // if the array element's index is less than ledLevel,
    // turn the pin for this element on
    if (thisLed < ledLevel) {
      digitalWrite(ledPins[thisLed], HIGH);
    }
    // turn off all pins higher than the ledLevel
    else {
      digitalWrite(ledPins[thisLed], LOW);
    }
  }
}