#define LDR_PIN 2

// LDR Characteristics
const float GAMMA = 0.7; // GAMMA Coefficient of the LDR
const float RL10 = 50; // RL10 Coefficient of the LDR
const float BETA = 3950; // BETA Coefficient of the thermistor

void setup() {
  Serial.begin(9600);
  // initialize digital pin LED_BUILTIN as an output.
  pinMode(LED_BUILTIN, OUTPUT);
  // initialize LDR
  pinMode(LDR_PIN, INPUT);
  // initialize Switch
  pinMode(3, INPUT_PULLUP);

}

// the loop function runs over and over again forever
void loop() {
digitalWrite(LED_BUILTIN, digitalRead((3)));
int Switch_Value=digitalRead((3));
if (Switch_Value>0) {
  Serial.print("Switch ON       ");

    // the loop function for Light Reading
    int analogValue_Light = analogRead(A8);
    float voltage = analogValue_Light / 1024. * 5;
    float resistance = 2000 * voltage / (1 - voltage / 5);
    float lux = pow(RL10 * 1e3 * pow(10, GAMMA) / resistance, (1 / GAMMA));
    Serial.print("Light Status: ");
    if (lux > 50) {
      Serial.print("Day       ");
      } else {
      Serial.print("Night     ");
      }

    // the loop function for Temperature Reading
    int analogValue_Temp = analogRead(A9);
    float celsius = 1 / (log(1 / (1023. / analogValue_Temp - 1)) / BETA + 1.0 / 298.15) - 273.15;
    Serial.print("Temperature: ");
    Serial.print(String(celsius, 1));
    Serial.println(" ℃");
    }

else {Serial.println("Switch OFF       ");}

delay(1000); // wait for a second
}