from machine import ADC, Pin
import time
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 = {}'.format(value))
    time.sleep(0.5)
    if value <=25:
        led1.on()
        led2.off()
        led3.off()
    elif value <=75:
        led1.off()
        led2.on()
        led3.off()
    elif value >=75:
        led1.off()
        led2.off()
        led3.on()
    else:
        led1.off()
        led2.off()
        led3.off()