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Ultrasonic Range sensor (US-100) test code (Let's try IoT Prototyping / MFT2020)
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#!/usr/bin/env python | |
# -*- coding: utf-8 -*- | |
import time | |
# 距離を読む関数 | |
def read_distance(): | |
# 必要なライブラリのインポート・設定 | |
import RPi.GPIO as GPIO | |
# 使用するピンの設定 | |
GPIO.setmode(GPIO.BOARD) | |
TRIG = 11 # ボード上の11番ピン(GPIO17) | |
ECHO = 13 # ボード上の13番ピン(GPIO27) | |
# ピンのモードをそれぞれ出力用と入力用に設定 | |
GPIO.setup(TRIG,GPIO.OUT) | |
GPIO.setup(ECHO,GPIO.IN) | |
GPIO.output(TRIG, GPIO.LOW) | |
# TRIG に短いパルスを送る | |
GPIO.output(TRIG, GPIO.HIGH) | |
time.sleep(0.00001) | |
GPIO.output(TRIG, GPIO.LOW) | |
# ECHO ピンがHIGHになるのを待つ | |
signaloff = time.time() | |
while GPIO.input(ECHO) == GPIO.LOW: | |
signaloff = time.time() | |
# ECHO ピンがLOWになるのを待つ | |
signalon = signaloff | |
while time.time() < signaloff + 0.1: | |
if GPIO.input(ECHO) == GPIO.LOW: | |
signalon = time.time() | |
break | |
# GPIO を初期化しておく | |
GPIO.cleanup() | |
# 時刻の差から、物体までの往復の時間を求め、距離を計算する | |
timepassed = signalon - signaloff | |
distance = timepassed * 17000 | |
# 500cm 以上の場合はノイズと判断する | |
if distance <= 500: | |
return distance | |
else: | |
return None | |
def main(): | |
while True: | |
distance = read_distance() | |
if distance: | |
print "距離: %.1f cm" % distance | |
time.sleep(1) | |
if __name__ == "__main__": | |
main() |
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