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Software/Python/grove_rotary_angle_sensor.py

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+#!/usr/bin/env python
+#
+# GrovePi Example for using the Grove Rotary Angle Sensor (Potentiometer) and the Grove LED to create LED sweep
+#
+# Modules:
+#	 http://www.seeedstudio.com/wiki/Grove_-_Rotary_Angle_Sensor
+#	 http://www.seeedstudio.com/wiki/Grove_-_LED_Socket_Kit
+# 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.
+'''
+
+
+import time
+import grovepi
+
+# Connect the Grove Rotary Angle Sensor to analog port A0
+# SIG,NC,VCC,GND
+potentiometer = 0
+
+# Connect the LED to digital port D5
+# SIG,NC,VCC,GND
+led = 5
+
+grovepi.pinMode(potentiometer,"INPUT")
+grovepi.pinMode(led,"OUTPUT")
+time.sleep(1)
+
+# Reference voltage of ADC is 5v
+adc_ref = 5
+
+# Vcc of the grove interface is normally 5v
+grove_vcc = 5
+
+# Full value of the rotary angle is 300 degrees, as per it's specs (0 to 300)
+full_angle = 300
+
+while True:
+    try:
+        # Read sensor value from potentiometer
+        sensor_value = grovepi.analogRead(potentiometer)
+
+        # Calculate voltage
+        voltage = round((float)(sensor_value) * adc_ref / 1023, 2)
+
+        # Calculate rotation in degrees (0 to 300)
+        degrees = round((voltage * full_angle) / grove_vcc, 2)
+
+        # Calculate LED brightess (0 to 255) from degrees (0 to 300)
+        brightness = int(degrees / full_angle * 255)
+
+        # Give PWM output to LED
+        grovepi.analogWrite(led,brightness)
+
+        print("sensor_value = %d voltage = %.2f degrees = %.1f brightness = %d" %(sensor_value, voltage, degrees, brightness))
+    except KeyboardInterrupt:
+        grovepi.analogWrite(led,0)
+        break
+    except IOError:
+        print ("Error")