 
 void toggle_led() {
   led_value = ! led_value;
-  digitalWrite(led_pin, led_value);
+  digitalWrite(LED_BUILTIN, led_value);
 }
 
 void turn_camera_on(int camera_pin) {

  Serial.flush();

  // Turn off LED inside camera box
  pinMode(led_pin, OUTPUT);
  digitalWrite(led_pin, LOW);

  // Setup Camera relays
  pinMode(CAM_01_PIN, OUTPUT);

            turn_camera_off(CAM_02_PIN);
          }
          break;
        case LED_BUILTIN:
          digitalWrite(pin_num, pin_status);
          break;
      }
