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Software/Python/grove_encoder_read.py

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+#!/usr/bin/env python
+#
+# GrovePi Example for using the Grove Encoder(http://www.seeedstudio.com/depot/Grove-Encoder-p-1352.html) with the GrovePi
+#
+# The GrovePi connects the Raspberry Pi and Grove sensors.  You can learn more about GrovePi here:  http://www.dexterindustries.com/GrovePi
+#
+# Have a question about this example?  Ask on the forums here:  http://forum.dexterindustries.com/c/grovepi
+#
+'''
+## 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
+THE SOFTWARE.
+'''
+
+# USAGE
+#
+# Connect the grove encoder to D2 on the GrovePi.
+# The encoder values go from 0 up to 32 
+# (although these can be subsequently changed by utilizing a different parameter for the encoder_en function)
+
+import time
+import grovepi
+
+print("Reading from the Grove Encoder")
+
+# default pin is 2 and default number of steps is 32
+grovepi.encoder_en()
+
+time_to_run = 10 # 10 seconds
+start = time.time() # current time in seconds
+old_val = 0
+
+while start + time_to_run > time.time():
+
+	# defaults to pin 2
+	new_val = grovepi.encoderRead()
+	if old_val != new_val:
+		print("{:3d}/32 position".format(new_val))
+		old_val = new_val
+
+# and disable the interrupt on pin 2
+grovepi.encoder_dis()