from machine import Pin, ADC  
import time,utime  
 
hall = Pin(26, Pin.IN)
r = Pin(6, Pin.OUT)
rv = 0

while True:
    if rv == 0:
        r.on()
        rv = 1
    else:
        r.off()
        rv = 0
    print(hall.value())
    time.sleep(2)