Raspberry Pi and Cosm

MrMobileWill cosm, python, raspberry pi, xbee 0 Comments

Over a month ago I decided to give Cosm.com a try instead of using my own MySQL database and graphing in Python. Since this was awhile ago I don’t remember everything I did to get it working but I will post the code and libraries I am using that work.

Here is a simple library to making sending to Cosm easy.

http://www.netfluvia.org/layer8/?p=175

Here is the full code I am using to log the PIR sensor to Cosm, after the jump.

#!/usr/bin/python
#PIR LOGGING TO COSM

import RPi.GPIO as GPIO
import sys
import time
import datetime
from datetime import timedelta
import cosm

API_KEY="API_KEY"
FEED_ID="FEED_ID"

def writeCosm(status):


pfu = cosm.PachubeFeedUpdate(FEED_ID,API_KEY)
pfu.addDatapoint("Pi",status)
pfu.buildUpdate()
pfu.sendUpdate()

print "Uploaded Motion data to Cosm"

return



ledPin = 17
pirPin = 18
motionCount = 0
timerMin = 1 #Number of minutes between database writes

GPIO.setmode(GPIO.BCM)
GPIO.setup(ledPin, GPIO.OUT)
GPIO.setup(pirPin, GPIO.IN)



loop = 1
while loop == 1 :

GPIO.output(ledPin, GPIO.HIGH)
time.sleep(.5)
GPIO.output(ledPin, GPIO.LOW)

startTimer = datetime.datetime.utcnow()
#startTimer2 = startTimer

while datetime.datetime.utcnow() < startTimer+timedelta(minutes=timerMin) :

#if datetime.datetime.utcnow() >= startTimer2+timedelta(milliseconds=600) :
motionCount+=GPIO.input(pirPin)
time.sleep(.60)
#startTimer2 = datetime.datetime.utcnow()

#motionCount = ((motionCount/500)*100)
writeCosm(motionCount)
motionCount = 0

print "Done"

This should be a good example to get you started. There are other libraries but this seemed the simplest to use and most straightforward. I am not sure if this is what I will stick with but it works for now. Using the same example, I am also logging my Smart Outlet temperature and light sensors to Cosm via an Xbee connected to the UART. I find that the temperature is not accurate at all, even with averaging the ADC. I’ll have to figure it out on another day.

RPi with Xbee Pro Series 1
The Xbee is using this adapter: http://www.digikey.com/product-detail/en/32403/32403PAR-ND/2696575

Comment below if you are using Cosm for your project, I would like to hear about it!

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