#include <LiquidCrystal_I2C.h>
const float GAMMA = 0.7;
const float RL10 = 50;
LiquidCrystal_I2C lcd(0x27, 20, 4);
#include <Adafruit_NeoPixel.h>
#define Din_PIN 10
#define NUMPIXELS 16
Adafruit_NeoPixel pixels (NUMPIXELS, Din_PIN, NEO_GRB + NEO_KHZ800);
void setup() {
lcd.init();
lcd.backlight();
pixels.begin();
pixels.clear();
pixels.show();
}
float lux ;
void check_light () {
int analogValue = analogRead(A0);
float voltage = analogValue / 1024. * 5;
float resistance = 2000 * voltage / (1 - voltage / 5);
lux = pow(RL10 * 1e3 * pow(10, GAMMA) / resistance, (1 / GAMMA));
lcd.setCursor(5, 0);
if (lux > 50) lcd.print("Light!");
else lcd.print("Dark ");
lcd.setCursor(0, 1);
lcd.print(" Lux: ");
lcd.print(lux);
lcd.print(" ");
}
void on_leds ()
{
pixels.clear();
if (lux > 50)
{
for (int i = 0; i < NUMPIXELS; i++) {
pixels.setPixelColor(i, pixels.Color(255, 255, 0));
}
}
else {
for (int i = 0; i < NUMPIXELS; i++) {
pixels.setPixelColor(i, pixels.Color(255, 0, 255));
}
}
pixels.show();
}
void loop() {
check_light ();
on_leds () ;
delay(100);
}