Question

我正在研究声纳传感器，该传感器回声信号并接收回声。还创建了一个算法，可根据读数计算距离。但是我面临一些奇怪的问题，有时传感器发送的随机数据根本不相关，例如与目标物的实际距离相差5cm-160cm，而传感器发送的数据却是2000 + cm。很难弄清原因，而且它也会自行关闭。

我的问题是

为什么传感器有时会发送错误的数据？
如何在程序中检测到传感器已关闭或处于活动状态？

我在Raspberry pi上使用Sonar传感器并使用此代码

# set Trigger to HIGH
GPIO.output(TRIGGER, True)
#print "GPIO", GPIO

# set Trigger after 0.01ms to LOW
time.sleep(0.00001)
GPIO.output(TRIGGER, False)

StartTime = time.time()
StopTime = time.time()

# save StartTime
try:
now = time.time()
    # save the time it takes just before ECHO hears the TRIGGER pulse (0 means nothing received)
    while GPIO.input(ECHO) == 0:
        StartTime = time.time()
    #print "StartTime ", StartTime
    #print "now: ", now
    if StartTime-now > 1:
        return -1
    #print("StartTime: " , StartTime)       #Printing this causes incorrect measurements.

    # save time of arrival
    while GPIO.input(ECHO) == 1:
        StopTime = time.time()
    #print("StopTime: ", StopTime)

except KeyboardInterrupt:
    return -1

# time difference between start and arrival
TimeElapsed = StopTime - StartTime

# multiply with the sonic speed (34300 cm/s)
# and divide by 2, because there and back
distance = (TimeElapsed * 34300) / 2

我正在使用此代码来计算距离

声纳传感器发送回随机数据并随机关闭

0 个答案: