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

AddressOfLcd = 0x27
i2c = I2C(0, scl=Pin(19), sda=Pin(18), freq=400000)
lcd = I2cLcd(i2c, AddressOfLcd, 2, 16)

class LDR:
    def __init__(self, pin, min_value=0, max_value=100):
        if min_value >= max_value:
            raise Exception('Min value is greater or equal to max value')
        self.adc = ADC(Pin(pin))
        self.adc.atten(ADC.ATTN_11DB)
        self.min_value = min_value
        self.max_value = max_value

    def read(self):
        return self.adc.read()

    def value(self):
        return (self.max_value - self.min_value) * self.read() / 4095

ldr = LDR(35)
led1 = Pin(2, Pin.OUT)
led2 = Pin(4, Pin.OUT)
led3 = Pin(5, Pin.OUT)

while True:
    value = ldr.value()
    print('Value = {:.2f}'.format(value))
    lcd.clear()
    lcd.putstr('Value: {:.2f} ohm'.format(value))
    
    if value <= 25:
        led1.on()
        led2.off()
        led3.off()
    elif value <= 75:
        led1.off()
        led2.on()
        led3.off()
    else:
        led1.off()
        led2.off()
        led3.on()
    
    time.sleep(1)