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Author Topic: Raspberry pi starters kit?  (Read 399 times)
daveluck_uk
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« on: November 04, 2018, 12:12:45 PM »

Hello,

Not sure if this is the right area....

Can anyone recommend a starter kit? I've got a spare 100 or so.

Winter is setting in and I want to have something to do for the long cold nights and miserable rainy days.

I've been thinking about this for a while. I was tempted by the Arduino for relative simlicity but decided I'd rather go for the Pi for more flexibility.

Don't know what I want that flexibility for mind you. In fact dont really know why I want a Pi...but for now making lights flash and bells ring etc and excising the very much unused grey cells sounds like fun.

It has been many, many years since I looked at code and made up some bits and bobs from Maplins. So all tense and purposes I'm a complete beginner.

Cheers

Dave
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eabadger
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« Reply #1 on: November 04, 2018, 12:26:57 PM »

i miss maplins
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1600w PV main array at 24v, excide 2v 1000a forklift cells now x 2, 320w PV secondary array at 12v. Enfield 1944 ex RAF 5.6kw diesel genset (now in pieces, big ends gone), Petter AC1 28v diesel charging set at 2.8kw.
1kw wind turbine.
26kw wood stove back boiler to underfloor heating and dhw
kristen
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« Reply #2 on: November 04, 2018, 02:27:21 PM »

Can anyone recommend a starter kit? I've got a spare 100 or so.

I'm desperate to do this too, but have no time (and anything Unix-y is a huge uphill for me ...)

If I send you my spare 100 can you make two? Smiley

I basically want temperature sensors in each room (and up and down the Thermal Store) and log data so I have history to analyse and based on that build a program that makes some simple decisions to supply heat to the building - that will be "Duration" and "Power".

"Power" will either be pump speed (Store-to-Rads) or Water Temperature (UFH)

My Phase 2 would be the actual Control side and for that I need to
#1 Simple "mains solenoid" to turn on CH circulation pump (old part of house)
#2 figure out a way to open/close the wax valves for the various zones controlled by the Heatmiser UFH manifold (in new part of house)

In case of interest my "Wants chatter" threads:

https://www.navitron.org.uk/forum/index.php/topic,30014.msg339940.html#msg339940
https://www.navitron.org.uk/forum/index.php/topic,29940.msg339144.html#msg339144
and my brain-dump-post
https://www.navitron.org.uk/forum/index.php/topic,29759.msg337502.html#msg337502
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kristen
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« Reply #3 on: November 04, 2018, 02:35:31 PM »

By way of example:

Right now my Store is at 62C.  Outside is pretty mild, and no wind. But I haven't looked at overnight temperature, maybe its going to be uber-cold ...

Laziness is influencing my decision, which is just to pump Store to RADs today and not light the boiler until tomorrow.

As Store falls towards 40C effectiveness of RADs will diminish ... and if store falls below 40C by tomorrow then I will have to wait longer into the burn before the Store is hot enough to heat RADs ... and might well have to top up the boiler.

There is a cut-off point at which it would be better to light the boiler today.  If it was winter, and colder, that is what I would do - and, given the store is at 60C, I would turn on the CH the moment I lit the boiler so that both CH RADs and Store operating temperature increases towards 90C at same rate.  I would wind up with nice warm house, fully-charged Store, and boiler going out just as we go to bed Smiley

But given that laziness is my main influence today, and perhaps I will regret that tomorrow morning when house is cold, and again tomorrow afternoon when I have to build temperature up before I can ONLY THEN heat the house ...

... a computer program that showed likely outcomes from the two proposals would be much better. Hence my first priority is data logging

Or I could just buy a NEST which will learn how to do all this from my normal lifestyle choices ... apparently  whistlie
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daveluck_uk
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« Reply #4 on: November 04, 2018, 02:36:43 PM »

Can anyone recommend a starter kit? I've got a spare 100 or so.

I'm desperate to do this too, but have no time (and anything Unix-y is a huge uphill for me ...)

If I send you my spare 100 can you make two? Smiley

I basically want temperature sensors in each room (and up and down the Thermal Store) and log data so I have history to analyse and based on that build a program that makes some simple decisions to supply heat to the building - that will be "Duration" and "Power".

"Power" will either be pump speed (Store-to-Rads) or Water Temperature (UFH)

My Phase 2 would be the actual Control side and for that I need to
#1 Simple "mains solenoid" to turn on CH circulation pump (old part of house)
#2 figure out a way to open/close the wax valves for the various zones controlled by the Heatmiser UFH manifold (in new part of house)

In case of interest my "Wants chatter" threads:

https://www.navitron.org.uk/forum/index.php/topic,30014.msg339940.html#msg339940
https://www.navitron.org.uk/forum/index.php/topic,29940.msg339144.html#msg339144
and my brain-dump-post
https://www.navitron.org.uk/forum/index.php/topic,29759.msg337502.html#msg337502

Mate, I'll be happy with flashing  LEDs in time to Slade ready for Christmas as phase 1 and all that lot above probably be phase 2 or 3!



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kristen
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« Reply #5 on: November 04, 2018, 02:43:01 PM »

Would 200 quid swing it? Smiley
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TT
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« Reply #6 on: November 04, 2018, 09:41:04 PM »

https://thepihut.com/collections/raspberry-pi-kits-and-bundles/Raspberry-Pi-3B+

No connection, just get my kit here.
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kristen
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« Reply #7 on: November 05, 2018, 04:56:52 PM »

Couldn't up my offer to @daveluck_uk Smiley so have started my own Arudino journey:

https://www.navitron.org.uk/forum/index.php/topic,30044.msg340225.html#msg340225
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daveluck_uk
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« Reply #8 on: November 06, 2018, 08:12:54 PM »

Apparently my spare 100 isn't as spare as I thought it was and I have to wait and see what Father Christmas brings me...
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Tigger
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« Reply #9 on: November 07, 2018, 10:36:54 AM »

I've been looking at this and wondering if I can evolve it to control the heating in our house.

https://www.instructables.com/id/Raspberry-Pi-Home-Heating-Controller/

I was thinking of putting a temperature sensor in each room and then seeing if I can somehow take apart the programmable thermostatic radiator valves I've got and open and close them using the Pi kit.

I've trawled t'internet for guides on taking a PTRV apart but can't find anything so either nobody has been brave enough or some have tried but failed........

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30 tubes, south facing gable wall (Navitron Fornax Trial System).  Hunter Herald 8, integrated boiler hooked up with Oil Boiler via H2 control panel.  Scrounging fire wood wherever possible Smiley
kristen
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« Reply #10 on: November 07, 2018, 01:25:06 PM »

I've been looking at this ....

I stumbled over that too ; I want to do much the same as you are planning.

Quote
I was thinking of putting a temperature sensor in each room and then seeing if I can somehow take apart the programmable thermostatic radiator valves I've got and open and close them using the Pi kit.

I've trawled t'internet for guides on taking a PTRV apart but can't find anything so either nobody has been brave enough or some have tried but failed........

I was put in touch with a Dyson engineer (on something else ... ) and visiting his house was a revelation.  Most conversations went along the lines of "I bought a dirt cheap thermostat, used a WiFi Network Monitor to spy on its network traffic, broke the encryption, and now I use them everywhere for temperature monitoring ..."

Speaking to my Home Automation Bloke the biggest stumbling block is going to be how to figure out how to get my Heatmiser gear to open/close the valves on my UFH manifold.  Not very keen on the plumbing effort of replacing the manifold (or just the Headers maybe?) with "something else", but maybe it will come to that.

It wants thermostats everywhere controlling each zone ... one thermostat would do, its very well insulated, heat requirement is tiny, but there is no such thing as an APP where I could say anything remotely like "Add Zone 2 to Thermostat A" ... that's a relays, solenoids, and soldering iron type job AFAIK.  Pathetic how lethargic these companies are, like Automakers blind to Tesla they will disappear into oblivion when better things arrive. I would rather not be the one DIY-engineering them though.

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Tigger
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« Reply #11 on: November 07, 2018, 01:33:29 PM »

You say you have access to a tame Dyson engineer so like me, do you live relatively close to Malmesbury then?

"I bought a dirt cheap thermostat, used a WiFi Network Monitor to spy on its network traffic, broke the encryption, and now I use them everywhere for temperature monitoring ..."  Typical engineer with too much time on their hands, I was fine with buying a dirt cheap thermostat but monitoring network traffic and breaking encryption suddenly makes it specialist instead of hobbyist Sad

But the idea of a simple thermostat in each room that fires up the boiler and opens and closes the radiator valve in just that room so that you only heat the room that needs it and for a sensible cost instead of the silly figures from the big suppliers where you'll never recover the outlay, it's got to be worth having a play.  Motorising an UFH manifold though, not sure i envy you that one.

If I do anything with it I'll share it on here  Smiley
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30 tubes, south facing gable wall (Navitron Fornax Trial System).  Hunter Herald 8, integrated boiler hooked up with Oil Boiler via H2 control panel.  Scrounging fire wood wherever possible Smiley
kristen
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« Reply #12 on: November 07, 2018, 02:38:31 PM »

You say you have access to a tame Dyson engineer so like me, do you live relatively close to Malmesbury then?

Nope, it was a bit of a trek, but we were visiting friends ... I'm in East Anglia

Quote
But the idea of a simple thermostat in each room that fires up the boiler and opens and closes the radiator valve in just that room so that you only heat the room that needs it and for a sensible cost instead of the silly figures from the big suppliers where you'll never recover the outlay, it's got to be worth having a play.  Motorising an UFH manifold though, not sure i envy you that one.

My current system does something like that. The Home Automation part sends the Heatmiser thermostat a "Maintain Temperature at 21C" type command. I can override the temperature at the thermostat, but it resets after a while (doesn't seem to be a fixed period - either its the next scheduled change (which might be 5 minutes time), or its an hour's override, but whatever it is I can't do anything different - useless. The idea is that if the Automation system breaks the Thermostats are still useful standalone ...

We've had several thermostats break, but not the Automation System .. so that chucks that theory out the window.

My preference is to Record Temperature (no additional capability required) in each zone, and then open-close valves accordingly.  Gives me a lot of scope to do "variations"

Review the weather
Use historical data to figure out what the reaction time is - ie. to figure out a suitable Weather Compensating algorithm
Allow easy "I'm be home at XX" or "House is empty UNTIL"
Sensor in Zone X is bust, simulate it based on heat it has needed (compared to other, working, sensors) in the past
There is no sensor in Zone Y (we have 3 thermostats in one single open plan area because they are deemed to be different zones, they've never been more than 0.5C different) figure that out from Zone Z instead.

Same with downstairs loo. I don't need a sensor in there, its usually quite cold in the winter, if I gave it X% of the nearest zone which did have a sensor that would do (where X% is determined empirically)

Along with lots of failsafes (don't seem to have any of those in present system). Even something simple like "Heat has been on for an hour in Zone X and normally that lifts the temperature by nC but today it has not changed / gone down" i.e. something bust, or a window left wide open and forgotten ...

We had parasitic heat use during the night, went on for months before I happened to notice it by reviewing the poxy little graphs on my phone.

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