ADEEPT PiCar-Pro Manual page 93

For the complete code, please refer to the file ultra.py.
1. import RPi.GPIO as GPIO
2. import time
3.
4. Tr = 11 # The pin number of the input end of the ultrasonic module
5. Ec = 8 # Pin number of the output end of the ultrasonic module
6.
7. GPIO.setmode(GPIO.BCM)
8. GPIO.setup(Tr, GPIO.OUT,initial=GPIO.LOW)
9. GPIO.setup(Ec, GPIO.IN)
Import the dependent library and initialize it.
1. def checkdist():
2. GPIO.output(Tr, GPIO.HIGH)
initial sound wave.
3. time.sleep(0.000015)
4. GPIO.output(Tr, GPIO.LOW)
5.
6. while not GPIO.input(Ec):
7. pass
8. t1 = time.time()
9. while GPIO.input(Ec):
10. pass
11. t2 = time.time()
12.
return
13. round((t2-t1)*340/2,2)
Define the ranging function. When the ultrasound module captures ultrasound, its output
terminal will output high frequency. The GPIO.input method can determine whether the output
terminal is outputting high-frequency signals.
for in
1. i range(10):
2. print(checkdist())
3. time.sleep(1)
The ultrasonic module measures the distance and displays the data on the console.
# Set the input terminal of the module to high level and send out an
# When the module no longer receives the initial sound wave
# Write down the time when the initial sound wave was emitted.
# When the module receives the return sound wave.
# Write down the time when the return sound wave was captured.
# Calculate the distance.
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