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Software/Python/grove_light_sensor.py

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+#!/usr/bin/env python
+#
+# GrovePi Example for using the Grove Light Sensor and the LED together to turn the LED On and OFF if the background light is greater than a threshold.
+# Modules:
+# 	http://www.seeedstudio.com/wiki/Grove_-_Light_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 Light Sensor to analog port A0
+# SIG,NC,VCC,GND
+light_sensor = 0
+
+# Connect the LED to digital port D4
+# SIG,NC,VCC,GND
+led = 4
+
+# Turn on LED once sensor exceeds threshold resistance
+threshold = 10
+
+grovepi.pinMode(light_sensor,"INPUT")
+grovepi.pinMode(led,"OUTPUT")
+
+while True:
+    try:
+        # Get sensor value
+        sensor_value = grovepi.analogRead(light_sensor)
+
+        # Calculate resistance of sensor in K
+        resistance = (float)(1023 - sensor_value) * 10 / sensor_value
+
+        if resistance > threshold:
+            # Send HIGH to switch on LED
+            grovepi.digitalWrite(led,1)
+        else:
+            # Send LOW to switch off LED
+            grovepi.digitalWrite(led,0)
+
+        print("sensor_value = %d resistance = %.2f" %(sensor_value,  resistance))
+        time.sleep(.5)
+
+    except IOError:
+        print ("Error")