树莓派3B使用超声波传感器
下面介绍在树莓派3B上使用超声波传感器HC-SR04的方法树莓派3B的GPIO定义如下
https://github.com/yfgeek/rpi-TempRuntime/raw/master/images/2.png
将超声波传感器的VCC GND TRIG ECHO分布连接到树莓派3B的Pin4 Pin6 Pin16 Pin18，然后上电，
登陆后输入下面代码创建hc-sr04.pyvi hc-sr04.py输入下面代码import RPi.GPIO as GPIO
import time
trigger_pin = 23
echo_pin = 24 # USE LEVEL CONVERTER 5V->3.3V
GPIO.setmode(GPIO.BCM)
GPIO.setup(trigger_pin, GPIO.OUT)
GPIO.setup(echo_pin, GPIO.IN)
def time_to_echo(timeout):
t0 = time.time()
while GPIO.input(echo_pin) == False and time.time() < (t0 + timeout):
pass
t0 = time.time()
while GPIO.input(echo_pin) == True and time.time() < (t0 + timeout):
pass
return time.time() - t0
def get_distance():
GPIO.output(trigger_pin, True)
time.sleep(0.00001) # 10us
GPIO.output(trigger_pin, False)
time.sleep(0.0002) # 200us
pulse_len = time_to_echo(1)
distance_cm = pulse_len / 0.000058
distance_in = distance_cm / 2.5
return (distance_cm, distance_in)
while True:
print("cm=%f\tinches=%f" % get_distance())
time.sleep(1)然后运行sudo python hc-sr04.py
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