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Projects/Ultrasonic_And_Relay/Ultrasonic_And_Relay.py

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+# GrovePi + Grove Ultrasonic Ranger
+# http://www.seeedstudio.com/wiki/Grove_-_Ultrasonic_Ranger
+
+# This is an project using the Grove Ultrasonic Ranger and Relay from GrovePi start kit
+# 
+# In this project, the ultrasonic can figure out the distance of object in front, 
+# when object close to it within 10cm, the relay will turn on
+
+'''
+## License
+
+The MIT License (MIT)
+
+GrovePi for the Raspberry Pi: an open source platform for connecting Grove Sensors to the Raspberry Pi.
+Copyright (C) 2017  Dexter Industries
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+'''
+
+from grovepi import *
+
+# Connect the Grove Ultrasonic Ranger to digital port D4
+# SIG,NC,VCC,GND
+
+ultrasonic_ranger = 4
+Relay_pin = 2
+
+pinMode(Relay_pin,"OUTPUT")
+
+while True:
+    try:
+        # Read distance value from Ultrasonic
+        distant = ultrasonicRead(ultrasonic_ranger)
+        print(distant,'cm')
+        if distant <= 10:
+            digitalWrite(Relay_pin,1)
+        else:
+            digitalWrite(Relay_pin,0)
+
+    except TypeError:
+        print("Error")
+    except IOError:
+        print("Error")