请教一下程序的问题

f6sw

为什么我这个程序time_start置0不了时间一直在加想知道怎么解决

import pyb
from pyb import Pin
pin5 = Pin('P5', Pin.IN)


while(True):
   if pin5.value() == 1:    
       time_start = pyb.millis()    
   if pin5.value() == 0: 
       duration = pyb.elapsed_millis(time_start)
       a = duration/1000000
       print(a,"ms")
       time_start = 0

kidswong999

因为你的

if pin5.value() == 1:    
       time_start = pyb.millis()

这一句总是执行了呗，要不你注释它