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Projects/plant_monitor/plant_project.py

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+#!/usr/bin/env python
+#
+# GrovePi Project for a Plant monitoring project.
+#	*	Reads the data from moisture, light, temperature and humidity sensor 
+#		and takes pictures from the Pi camera periodically and logs them
+#	*	Sensor Connections on the GrovePi:
+#			-> Grove Moisture sensor	- Port A1
+#			-> Grove light sensor		- Port A2
+#			-> Grove DHT sensors		- Port D4
+#
+# NOTE:
+#	*	Make sure that the Pi camera is enabled and works. Directions here: https://www.raspberrypi.org/help/camera-module-setup/
+#	
+# 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
+import subprocess
+import math
+
+#analog sensor port number
+mositure_sensor			= 1
+light_sensor			= 2
+
+#digital sensor
+temp_himidity_sensor	= 4
+
+#temp_himidity_sensor type
+#	grove starter kit comes with the bluew sensor
+blue=0
+white=1
+
+#############
+#test timings
+time_for_sensor		= 4		#  4 seconds
+time_for_picture	= 12	# 12 seconds
+
+#	final
+# time_for_sensor		= 1*60*60	#1hr
+# time_for_picture		= 8*60*60	#8hr
+
+time_to_sleep		= 1
+log_file="plant_monitor_log.csv"
+
+#Read the data from the sensors
+def read_sensor():
+	try:
+		moisture=grovepi.analogRead(mositure_sensor)
+		light=grovepi.analogRead(light_sensor)
+		[temp,humidity] = grovepi.dht(temp_himidity_sensor,white)
+		#Return -1 in case of bad temp/humidity sensor reading
+		if math.isnan(temp) or math.isnan(humidity):		#temp/humidity sensor sometimes gives nan
+			return [-1,-1,-1,-1]
+		return [moisture,light,temp,humidity]
+	
+	#Return -1 in case of sensor error
+	except IOError as TypeError:
+			return [-1,-1,-1,-1]
+
+#Take a picture with the current time using the Raspberry Pi camera. Save it in the same folder
+def take_picture():
+	try:
+		cmd="raspistill -t 1 -o plant_monitor_"+str(time.strftime("%Y_%m_%d__%H_%M_%S"))+".jpg"
+		process = subprocess.Popen(cmd.split(), stdout=subprocess.PIPE)
+		output = process.communicate()[0]
+		print("Picture taken\n------------>\n")
+	except:
+		print("Camera problem,please check the camera connections and settings")
+
+#Save the initial time, we will use this to find out when it is time to take a picture or save a reading
+last_read_sensor=last_pic_time= int(time.time())
+
+while True:
+	curr_time_sec=int(time.time())
+	
+	# If it is time to take the sensor reading
+	if curr_time_sec-last_read_sensor>time_for_sensor:
+		[moisture,light,temp,humidity]=read_sensor()
+		# If any reading is a bad reading, skip the loop and try again
+		if moisture==-1:
+			print("Bad reading")
+			time.sleep(1)
+			continue
+		curr_time = time.strftime("%Y-%m-%d:%H-%M-%S")
+		print(("Time:%s\nMoisture: %d\nLight: %d\nTemp: %.2f\nHumidity:%.2f %%\n" %(curr_time,moisture,light,temp,humidity)))
+		
+		# Save the sensor reading to the CSV file
+		f=open(log_file,'a')
+		f.write("%s,%d,%d,%.2f,%.2f;\n" %(curr_time,moisture,light,temp,humidity))
+		f.close()
+		
+		#Update the last read time
+		last_read_sensor=curr_time_sec
+	
+	# If it is time to take the picture
+	if curr_time_sec-last_pic_time>time_for_picture:
+		take_picture()
+		last_pic_time=curr_time_sec
+	
+	#Slow down the loop
+	time.sleep(time_to_sleep)