smart_night_light.ino

int photo_pin = 1;
int light_pin = 10;
int light_hist[50] = {};
int loop_count = 0;

void setup() {
  pinMode(light_pin, OUTPUT);
}

void loop() {
  //read the value from our photo resistor
  float light_reading = analogRead(photo_pin);
  
  //loop through the array from start to finish. A bit tricky since the values are just appended to the array
  int read_start = loop_count + 1;
  if ( read_start > 50) { read_start = 0 }
  int read_stop = read_start + 50;
  
  int running_avg = 0;
  int hist_key = 0;
  for (i = read_start; i <= read_stop; i = i + 1) {
    hist_key = i;
    //keeps us reading sequentially
    if (i > 50) { hist_key = i - 50; }
    running_avg = int((light_hist[loop_count] + running_avg) / 2);
  }
  
  //assign current light reading to the running light_hist array
  light_hist[loop_count] = light_reading;
  
  //keep a running count for ever iteration through loop. Start over at 50
  loop_count = loop_count + 1;
  if (loop_count > 50){
    loop_count = 0;
  }  
  
}