The thermometer I had in my greenhouse doesn't seem to like the cold and stops working in low temperatures (pretty useless for a thermometer). I wanted a new solution which would measure the temperature of the grow beds and nutrient tanks too, so I decided to implement a system using an 'Electric Imp' module and some Dallas DS1820B temperature sensors. As I progressed with the project, I found a neat way to get some pretty nifty graphs of the temperature over time using an online graph plotting service called plotly.

Ponicwars (aka Ryan) had mentioned in a previous comment that he'd be interested in seeing how to make a wifi-connected internet-enabled system for monitoring temperature and pH, so rather than just a quick 'look at what I made', this is a full-blown 'here's how to make one' video. I'm afraid it's a bit lenghty, but I wanted to try and show everything so that you could see just how ridiculously easy this thing was to put together. Cut 'n' paste a couple of times, two electronic components and an Imp board and you've got a working multi-point cloud-enabled Internet-of-Things temperature graphing solution up and running for about $50.

Here's the links to the graphs I show in the video - each of these is dynamically generated when you pop the URL into your browser. One of the co-founders of plotly sent me a mail offering me help and showed me how to embed these graphs into another website (which I'll do in the future) - Thanks Plotly.

I have now updated my graphing to show all the values on the same chart, and added some labels and second Y axis for the supply voltage.
The new shiny chart is at plot.ly/~Fecn/340/hydroponic-greenhouse-temperatur…
The original charts shown in the video are still avaiable below but are no longer receiving data updates from the sensors.
Ambient Air : plot.ly/~Fecn/161.embed
Lower Growbed : plot.ly/~Fecn/162.embed
Growbed Nutrients: plot.ly/~Fecn/163.embed
Upper Growbed: plot.ly/~Fecn/164.embed
Lower NFT Nutrients: plot.ly/~Fecn/207.embed
Supply Voltage: plot.ly/~Fecn/147.embed

I'm afraid that I can't actually paste the code into the description as I planned because youtube tells me the description is too long, so I've put it up on Github instead

Full Source: github.com/jimconner/greenhouse_monitoring

Cheers!!