import math
from machine import Pin, I2C, ADC
import time
from i2c_lcd import I2cLcd  

# Konstanta
rl10 = 50e3     
gamma = 0.7     

# Inisialisasi I2C untuk LCD
i2c = I2C(0, scl=Pin(22), sda=Pin(21), freq=400000)  
lcd = I2cLcd(i2c, 0x27, 2, 16)  

# Inisialisasi ADC untuk LDR
adc = ADC(Pin(34))  
adc.atten(ADC.ATTN_11DB)  

def calculate_resistance():
    value = adc.read()  
    voltage_ratio = value / (4095 - value)
    return 10e3 * voltage_ratio  

def calculate_lux(resistance):
    return 10 * math.pow(rl10 / resistance, 1 / gamma)

def setup():
    lcd.clear()
    lcd.putstr("Welcome To My   Project...")
    time.sleep(2)
    lcd.clear()

def main():
    setup()
    
    while True:
        # Hitung resistansi dari pembacaan ADC
        resistance = calculate_resistance()
        
        # Hitung nilai lux dari resistansi
        lux_value = calculate_lux(resistance)

        # Tampilkan hasil di LCD
        lcd.clear()
        lcd.putstr("Lux: {:.1f}".format(lux_value))

        # Tampilkan juga di konsol
        print("Resistance: {:.2f} kΩ, Lux: {:.2f}".format(resistance / 1000, lux_value))

        time.sleep(2)

if __name__ == "__main__":
    main()