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Rousie
Posts: 2
Joined: Mon Dec 08, 2014 9:05 pm

Idea - Help Required

Mon Dec 08, 2014 9:19 pm

Good evening all,

I'm new to the RPi, and learning Python too, but have been an avid PC enthusiast since Adam was a lad, :mrgreen: dabbling in most hardware / software projects & advance cooling too!

Anyway, i've bought the RPi B+ with the intent of buying more units to perform various tasks around the house, including CCTV, Home Automation among other things...

The first thing i would like to do is the following, so i have questions, and open to suggestions to help me on the way.

I would like to place a temperature probe in each room of the house, ideally the wiring can be done through the vast amount of redundant CAT6 i installed when renovating the house. (Approx 10 rooms)

I would then like these hooked up to the Pi (via Gertduino?) which are constantly being monitored.

I would then like a program that reads all the temperatures, works out an average, which will then trigger a relay or output to turn the heating on or off, and in the future, possibly trigger an AC system to cool things down or open some electric roof windows.

Now, the idea is all in my head, but really don't know where to start and what other hardware i should be buying or the kind of Python program i should be looking at writing.

Hope someone would be kind enough to help me out, as i would like to document this as i go along.

Many thanks,

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B.Goode
Posts: 10356
Joined: Mon Sep 01, 2014 4:03 pm
Location: UK

Re: Idea - Help Required

Mon Dec 08, 2014 9:39 pm

Easy! Google for "DS18B20" - Very cheap 'one wire' (actually you need 2 or 3 wires... ) device that works on a bus, so you can daisy-chain multiple sensors to one RPi port. Lots of example python code around for reading the results. Good luck with your project.

ame
Posts: 3172
Joined: Sat Aug 18, 2012 1:21 am
Location: New Zealand

Re: Idea - Help Required

Mon Dec 08, 2014 9:43 pm

Please feel free to browse the forums for all of the similar home automation/heating control projects that have been discussed here at length.

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B.Goode
Posts: 10356
Joined: Mon Sep 01, 2014 4:03 pm
Location: UK

Re: Idea - Help Required

Mon Dec 08, 2014 9:49 pm

ame wrote:Please feel free to browse the forums for all of the similar home automation/heating control projects that have been discussed here at length.
+1

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Rousie
Posts: 2
Joined: Mon Dec 08, 2014 9:05 pm

Re: Idea - Help Required

Tue Dec 09, 2014 9:09 pm

Thanks for the replies people! I've ordered some sensors and a few other bits!

Question though: If i'm wiring up 10 sensors, what are my options to get the power through to them? I'll run it through CAT6, but some lengths are perhaps 10m...

ame
Posts: 3172
Joined: Sat Aug 18, 2012 1:21 am
Location: New Zealand

Re: Idea - Help Required

Tue Dec 09, 2014 9:14 pm

Rousie wrote:Thanks for the replies people! I've ordered some sensors and a few other bits!

Question though: If i'm wiring up 10 sensors, what are my options to get the power through to them? I'll run it through CAT6, but some lengths are perhaps 10m...
That is a trivially small installation. You'll have no trouble.

Read more about one-wire sensor bus limitations here:
http://www.maximintegrated.com/en/app-n ... mvp/id/148

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