from sys import stdout
from machine import ADC,Pin
import uasyncio

def led_s():
    cn1 = Pin(18, Pin.OUT)
    init_value = -1
    pin_value = 0
    def ctrl_led(current_value):
        nonlocal init_value,pin_value
        if init_value == -1:
            init_value = current_value
            print('led init_value:', init_value)
        elif current_value > init_value + 3000:
            cn1.off()
        else:
            cn1.on()
    return ctrl_led

async def sensor():
    adc = ADC(Pin(34), atten=ADC.ATTN_11DB)        # create an ADC object acting on a pin
    ctrl_led = led_s()
    while True:
        val = adc.read_u16()  # read a raw analog value in the range 0-65535
        ctrl_led(val)
        wdat = 'val:{}'.format(val)
        print(wdat, end='\x08' * len(wdat))
        await uasyncio.sleep_ms(50)
        print(' ' * len(wdat), end='\x08' * len(wdat))

if __name__ == '__main__':
    uasyncio.run(sensor())