Night Light

// Night light
// Is it getting dark? Then the LED ring glows softly. Is it getting light? Then it turns off.

#include <Adafruit_NeoPixel.h>

const int LIGHT_PIN = A0;   // S of the light sensor on A0
const int RING_PIN = 6;     // DI of the LED ring on pin 6
const int LED_COUNT = 8;

// At this value, we call it "dark". Look in the serial monitor which number you see
// in light and in the dark, and put a number in between here.
const int DARK_LIMIT = 500;

Adafruit_NeoPixel ring(LED_COUNT, RING_PIN, NEO_GRB + NEO_KHZ800);

void setup() {
  Serial.begin(9600);
  ring.begin();
  ring.setBrightness(60);
  ring.show();
}

void loop() {
  int light = analogRead(LIGHT_PIN);   // A number from 0 to 1023
  Serial.print(F("Light sensor: "));
  Serial.println(light);

  // With this sensor, the number gets higher when it gets darker.
  // Does it work the other way round for you? Then change > to <.
  bool dark = light > DARK_LIMIT;

  for (int i = 0; i < LED_COUNT; i++) {
    if (dark) {
      ring.setPixelColor(i, ring.Color(255, 140, 40));  // Warm yellow light
    } else {
      ring.setPixelColor(i, 0);                         // Off
    }
  }
  ring.show();
  delay(200);
}