from machine import Pin, PWM, ADC
from time import sleep

adc = ADC(Pin(27))
led = Pin(5, Pin.OUT)
sw = Pin(20, Pin.IN, Pin.PULL_UP)

pwmled = PWM(Pin(0))
pwmled.freq(1000)

pwmServo = PWM(Pin(1))
pwmServo.freq(50)

while True:
    led.on()

    density = adc.read_u16()
    pwmled.duty_u16(density)

    deg = adc.read_u16() // 8  
    pwmServo.duty_u16(deg)

    sleep(0.1)
    state = sw.value()
    if state == 0:
        for pos in range(deg, 1000, -100):
            pwmServo.duty_u16(pos)
            sleep(0.01)