智能小车|树莓派智能四轮小车实现超声波测距

【智能小车|树莓派智能四轮小车实现超声波测距】智能小车|树莓派智能四轮小车实现超声波测距
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#! /usr/bin/python # -*- coding:utf-8 -*-import RPi.GPIO as GPIO import time

import RPi.GPIO as GPIO import timedef checkdist():

#发出触发信号 GPIO.output(2,GPIO.HIGH) #保持10us以上(我选择15us) time.sleep(0.000015) GPIO.output(2,GPIO.LOW) while not GPIO.input(3): pass #发现高电平时开时计时 t1 = time.time() while GPIO.input(3): pass #高电平结束停止计时 t2 = time.time() #返回距离,单位为米 return (t2-t1)*340/2

GPIO.setmode(GPIO.BCM) #第3号针,GPIO2 GPIO.setup(2,GPIO.OUT,initial=GPIO.LOW) #第5号针,GPIO3 GPIO.setup(3,GPIO.IN)time.sleep(2) try: while True: print 'Distance: %0.2f m' %checkdist() time.sleep(0.5) except KeyboardInterrupt: GPIO.cleanup()```

正常!!
智能小车|树莓派智能四轮小车实现超声波测距
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