from machine import Pin, PWM, ADC, I2C
from time import sleep
pwm = PWM(Pin(19), freq=50)
adc = ADC(Pin(15))
adc.atten(ADC.ATTN_11DB)
led1 = Pin(13,Pin.OUT)
led2 = Pin(12,Pin.OUT)
led3 = Pin(14,Pin.OUT)
led4 = Pin(27,Pin.OUT)

while 1:
    adv_value = adc.read()/4
    print("ADC Value = " + str(adv_value))
    pwm.duty(int(adv_value))
    if adv_value < 205: 
        led1.off()
        led2.off()
        led3.off()
        led4.off()
    if adv_value>210 and adv_value<410:
        led1.on()
        led2.off()
        led3.off()
        led4.off()
    if adv_value>410 and adv_value<615:
        led1.on()
        led2.on()
        led3.off()
        led4.off()
    if adv_value>615 and adv_value<820:
        led1.on()
        led2.on()
        led3.on()
        led4.off()
    if adv_value>820: 
        led1.on()
        led2.on()
        led3.on()
        led4.on()