//Lab12 LDR+LCD
#include <LiquidCrystal_I2C.h> //libabry LiquidCrystal_I2C ke dalam program
int ldrPin = A0; //
int ledPin = 2; //
const float GAMMA = 0.7; //
const float RL10 = 50; //
LiquidCrystal_I2C lcd(0x27, 16, 2); //
void setup() {
// put your setup code here, to run once:
pinMode(ledPin, OUTPUT); //inisialisai ledPin sebagai pin output
lcd.init(); //
lcd.backlight(); //
}
void loop() {
int analogValue = analogRead(A0);
float voltage = analogValue / 1024. * 5;
float resistance = 2000 * voltage / (1 - voltage / 5);
float lux = pow(RL10 * 1e3 * pow(10, GAMMA) / resistance, (1 / GAMMA));
lcd.setCursor(0, 0); //
lcd.print("Room: "); //
if(lux > 500){ //
lcd.print("Light"); //
digitalWrite(ledPin, LOW); //
}
else{ //j
lcd.print("Drak "); //
digitalWrite(ledPin, HIGH); //
}
lcd.setCursor(0, 1);
lcd.print("Lux: ");
lcd.print(lux);
lcd.print(" ");
delay(100);
}