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Type: Posts; User: paulca

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    Just one final comment on InfluxDB. It is not...

    Just one final comment on InfluxDB.

    It is not round robin. I see some people see this as an advantage. I like the round robin nature, the files never grow. I never need to worry about running...
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    On ESPs. Yes I totally agree they are an amazing...

    On ESPs. Yes I totally agree they are an amazing platform to do all manor of things.

    The one downside of them in power consumption. They can consume around an average of 30-40mA of current. ...
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    On OpenTherm. You are right that brute forcing...

    On OpenTherm. You are right that brute forcing the relay ON/OFF on the power feed to the boiler is certainly not a wise option on a new gas boiler, even though it might appear to work. The option I...
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    A small update, purely graphical. I spend half...

    A small update, purely graphical. I spend half an hour working with Cacti to combine the graphs:

    Ambient Temperatures
    Heating Status
    Presence Home

    To create this beauty. All the information...
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    Hi, thanks for your thoughts. Asides from the...

    Hi, thanks for your thoughts.

    Asides from the experiment of controlling the heating loop temp at 40*C, which I don't think I really need to do, the boiler really only cycles at most 2 or 3 times...
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    Technically no RF is digital, not Wifi, not GSM. ...

    Technically no RF is digital, not Wifi, not GSM. Mother nature does not do digital.

    But I take your point that the payload is digitally encoded.

    It is the analogue nature of RF that scares me...
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    So the issue I'm facing currently is less to do...

    So the issue I'm facing currently is less to do with the control system and more about my house. I only bought it in July.

    The living room seems to be the coldest room in the house. It's also...
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    So just a little update on stuff I did over the...

    So just a little update on stuff I did over the weekend.

    This started out as just pure geeky fun but I put temp probes on the heating in and out pipes. Producing this graph:
    ...
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    Wifi, bluethooth, ethernet. But you could argue...

    Wifi, bluethooth, ethernet. But you could argue the first two are RF. So maybe I should have been clearer and specified 433MHz non-digital RF. Like key fobs.

    Still the same old mine field with...
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    As a random aside I had an epiphany about "RF". ...

    As a random aside I had an epiphany about "RF". I hate it because it's old-tech, because it's horrible to work with as a casual hobbyiest/maker. Electronics with RF involve horrid mathematics.
    ...
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    Two options which are viable for the PI to avoid...

    Two options which are viable for the PI to avoid the SD card are:

    1. Move high activity folders to a RAM disk to keep the SD card writes low. Things such as /var and /dev etc. Although you lose...
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    Maybe. I just don't think flash memory is great...

    Maybe. I just don't think flash memory is great for a full OS as it normally entails a lot of "thrash" and "churn", writing and rewriting constantly. Things may have improved but I vaguely recall...
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    Thank you. I was hoping it was of interest to at...

    Thank you. I was hoping it was of interest to at least some one. However it also helps me solidify my thoughts.

    So this morning I noticed the Raspberry PI in the garage was sick :( It only send...
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    Quick update on the first proper test of the...

    Quick update on the first proper test of the presence detection as I was working from home yesterday.

    So it passes on both fronts. Yesterday when I was in all day it remained active and kept my...
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    So... presence awareness. I didn't like that...

    So... presence awareness.

    I didn't like that the following schedule:

    6:30-8:00 Mon-Fri 17:00-23:00 Mon-Fri - Living Room - 20C

    would not account in anyway for me to be "out" during the...
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    So I finally got the heating control implemented...

    So I finally got the heating control implemented and functioning. I did have to pull a feature or two out of the Version 2.0 stack, but as "Demands" had already been used for the group lighting I...
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    A little off-topic from heating control, but a...

    A little off-topic from heating control, but a cool feature that popped up.

    I have 4 lights in my living room. All are plugged into wall sockets. On an evening I typically have to go around the...
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    So heating control. Now bear in mind I am kind...

    So heating control. Now bear in mind I am kind of deliberately doing this "clean room" style. That means I am not really looking at what others are doing or how they do it. I am trying to design...
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    So far my research has only found a rather nasty...

    So far my research has only found a rather nasty looking Open TRV project which is very unappealing or... mains operated valves which aren't much better.

    Surely someone must have created an open...
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    Also, just a quick, but VERY important warning...

    Also, just a quick, but VERY important warning about current clamps.

    NEVER EVER put the clamp around a live wire with it unloaded. Without a burden resistor on a current clamp (transformer) the...
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    Something I was also looking into recently. ...

    Something I was also looking into recently. Unfortunately you can't really just take the current output from the clamp and multiple it by your mains voltage to get power. This will give you a badly...
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    Some rather pretty graphs from my system: ...

    Some rather pretty graphs from my system:

    Ambient temperatures. Note the huge spike in the garage temp when the clothes drier is running!
    https://i.imgur.com/XnzzGTt.png

    This should make...
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    So before I outline my design for the heating...

    So before I outline my design for the heating control scheduling, a small aside.

    I got the SOnOff basic switches in the post. They didn't work at all with the supported software. This was only...
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    Hackable Rad Valves

    Hi,

    I'm looking to source some motorized radiator valves. The difficult bit is that I do not want any proprietary company system. Well, not unless I can hack it to do as I please. Just valves I...
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    So as i said the first thing I intend to control...

    So as i said the first thing I intend to control is the heating. Presently I have oil fired heating where the boiler is switched directly by the heating controller relay. The wiring diagram for an...
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