from machine import Pin,PWM,ADC

def velo(j):
    global y
    if y==1:
        y=0
    else:
        y=1
adc=ADC(Pin(34))
adc.width(ADC.WIDTH_9BIT)
adc.atten(ADC.ATTN_11DB)
s1 = PWM(Pin(23),freq=50)
p1= Pin(19,Pin.IN,Pin.PULL_UP)
p1.irq(trigger=Pin.IRQ_FALLING,handler=velo)
d1=Pin(22,Pin.OUT)
d2=Pin(21,Pin.OUT)
y=0


while(1):
    val=adc.read()
    s1.duty(val)
    if y==0:
        d1.on()
        d2.off()
    else:
        d1.off()
        d2.on()
    print(y)