const int analogPin = 34; // the pin that the potentiometer is attached to
const int ledCount = 10; // the number of LEDs in the bar graph
int ledPins[] =
{
13, 15, 2, 4, 5, 18, 19, 21, 22, 23
}; // an array of pin numbers to which LEDs are attached
void setup()
{
// loop over the pin array and set them all to output:
for (int thisLed = 0; thisLed < ledCount; thisLed++)
{
pinMode(ledPins[thisLed], 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);
}
}
}