from machine import Pin, PWM, ADC

pwm = PWM(Pin(15))
adc = ADC(Pin(28))

button = Pin(14, Pin.IN, Pin.PULL_UP) 
pwm.freq(1000)

led_on = False

while True:
    duty = adc.read_u16()
    pwm.duty_u16(duty)

    button_state = button.value()

    if button_state == 0:
        led_on = not led_on
        if led_on:
            pwm.duty_u16(65535) 
        else:
            pwm.duty_u16(0)