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Projects/Home_Weather_Display/Home_Weather_Display.py

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+# Home_Weather_Display.py
+#
+# This is an project for using the Grove RGB LCD Display and the Grove DHT Sensor from the GrovePi starter kit
+#
+# In this project, the Temperature and humidity from the DHT sensor is printed on the RGB-LCD Display
+#
+#
+# Note the dht_sensor_type below may need to be changed depending on which DHT sensor you have:
+#  0 - DHT11 - blue one - comes with the GrovePi+ Starter Kit
+#  1 - DHT22 - white one, aka DHT Pro or AM2302
+#  2 - DHT21 - black one, aka AM2301
+#
+# For more info please see: http://www.dexterindustries.com/topic/537-6c-displayed-in-home-weather-project/
+#
+'''
+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.
+'''
+
+from grovepi import *
+from grove_rgb_lcd import *
+from time import sleep
+from math import isnan
+
+dht_sensor_port = 7 # connect the DHt sensor to port 7
+dht_sensor_type = 0 # use 0 for the blue-colored sensor and 1 for the white-colored sensor
+
+# set green as backlight color
+# we need to do it just once
+# setting the backlight color once reduces the amount of data transfer over the I2C line
+setRGB(0,255,0)
+
+while True:
+	try:
+        # get the temperature and Humidity from the DHT sensor
+		[ temp,hum ] = dht(dht_sensor_port,dht_sensor_type)
+		print("temp =", temp, "C\thumidity =", hum,"%")
+
+		# check if we have nans
+		# if so, then raise a type error exception
+		if isnan(temp) is True or isnan(hum) is True:
+			raise TypeError('nan error')
+
+		t = str(temp)
+		h = str(hum)
+
+        # instead of inserting a bunch of whitespace, we can just insert a \n
+        # we're ensuring that if we get some strange strings on one line, the 2nd one won't be affected
+		setText_norefresh("Temp:" + t + "C\n" + "Humidity :" + h + "%")
+
+	except (IOError, TypeError) as e:
+		print(str(e))
+		# and since we got a type error
+		# then reset the LCD's text
+		setText("")
+
+	except KeyboardInterrupt as e:
+		print(str(e))
+		# since we're exiting the program
+		# it's better to leave the LCD with a blank text
+		setText("")
+		break
+
+	# wait some time before re-updating the LCD
+	sleep(0.05)