最近买了一个超声波测距传感器HC-SR04,网上对它的资料讲解非常多,这里就简单的备份下代码吧。
CONTENTS
原理:
转自【 超声波测距模块(HC-SR04).pdf 】
测试代码:
转自【 http://www.raspberrypi-spy.co.uk/2012/12/ultrasonic-distance-measurement-using-python-part-1/ 】
连线方式:
TRIG === GPIO4
ECHO === GPIO5
import time import time import RPi.GPIO as GPIO def getDistanceCM(): GPIO.setmode(GPIO.BCM); GPIO_TRIGGER = 23; GPIO_ECHO = 24; GPIO.setup(GPIO_TRIGGER,GPIO.OUT); GPIO.setup(GPIO_ECHO,GPIO.IN); GPIO_HIGH = GPIO.HIGH; GPIO_LOW = GPIO.LOW; GPIO.output(GPIO_TRIGGER, GPIO_LOW); time.sleep(0.00001); GPIO.output(GPIO_TRIGGER, GPIO_HIGH); time.sleep(0.00001); GPIO.output(GPIO_TRIGGER, GPIO_LOW); while GPIO.input(GPIO_ECHO)==GPIO_LOW: pass; start = time.time(); while GPIO.input(GPIO_ECHO)==GPIO_HIGH: pass; stop = time.time(); elapsed = stop-start; distance = elapsed * 34000; distance = distance / 2; GPIO.cleanup(); return distance; if __name__ == '__main__': distance = getDistanceCM(); print(distance);
使用方法:
root@raspberrypi:/home/pi# python3 HelloDistance.py 51.44214630126953
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