Air con decoding

[kris]

Hi All,

Our electricity bill for the space arrived. It's over $1000 again.

We have done experiments and are convinced that we are responsible for a
frankly staggering amount of KWh used (as oppose to a meter reading
error or our circuit being connected to another unit).

To reduce our usage we've been putting the more hungry things like
aircon and vendo on timers. However the aircon has an issue. When power
is restored to it, it returns to it's last state. Which means that if it
happens to be on at 10pm on a Tuesday the aircon will restart at 10am
the following day when the timer restores power, and can potentially
stay on for 12 hours everyday until someone turns it off.

This is most likely what is causing the bill.

I'm going to put a "press here to turn on the Air con for 2 hours"
button by the door. After two hours it will send the ir command to turn off.

And that's where you come in.

I've built an IR capture circuit using IRlib and it's recognised every
device i have in the house. When i took it to the space, it did not
recognise the code from the aircon.
Has anyone had experience in building ir protocols from scratch or can
otherwise let me know the (arduino) code required to turn the aircon on
and off

raw output below.

The air conditioner is a
Panasonic CS-W24EKR (outdoor unit CU-W24EKR). The remote says Panasonic
but otherwise has not useful markings apart from A75C2624 4693 stamped
into the plastic on the back.

Kris

-------- Forwarded Message --------
Subject: notes about aircon
Date: Sat, 31 Mar 2018 13:43:17 +1100
From: Kris <kr...@sleepingplanet.com>
To: kr...@sleepingplanet.com

    with the air con off, this is the power button

Decoded Unknown(0): Value:0 Adrs:0 (0 bits)
Raw samples(100): Gap:57722
  Head: m3402  s3566
0:m790 s2694    1:m786 s2698         2:m790 s2694    3:m790 s930
4:m810 s954    5:m790 s930         6:m810 s2694    7:m790 s954
8:m786 s2698    9:m790 s2694         10:m826 s2654    11:m818 s926
12:m790 s954    13:m814 s906         14:m810 s2694    15:m794 s946

16:m794 s950    17:m790 s2694         18:m790 s950    19:m814 s930
20:m786 s954    21:m794 s950         22:m790 s930    23:m814 s926
24:m818 s946    25:m786 s2698         26:m790 s954    27:m790 s950
28:m790 s954    29:m786 s954         30:m790 s934    31:m806 s954

32:m3406 s3562    33:m786 s2698         34:m790 s2694    35:m790 s2694
36:m790 s930    37:m814 s950         38:m790 s930    39:m814 s2690
40:m794 s950    41:m790 s2694         42:m790 s2690    43:m798 s2690
44:m790 s950    45:m790 s954         46:m814 s926    47:m794 s2690

48:m790
Extent=127950
Mark  min:786     max:3406
Space min:906     max:3562

with the air con on pressing the power button gives

Decoded Unknown(0): Value:0 Adrs:0 (0 bits)
Raw samples(100): Gap:53342
  Head: m3430  s3514
0:m838 s902    1:m842 s902         2:m838 s902    3:m842 s2642
4:m842 s898    5:m842 s902         6:m842 s2642    7:m842 s898
8:m842 s902    9:m842 s902         10:m838 s902    11:m838 s2650
12:m834 s902    13:m842 s902         14:m838 s2646    15:m838 s902

16:m842 s902    17:m838 s2646         18:m838 s902    19:m842 s902
20:m838 s902    21:m842 s898         22:m842 s902    23:m838 s906
24:m838 s898    25:m842 s2646         26:m838 s902    27:m842 s898
28:m842 s902    29:m842 s902         30:m838 s902    31:m842 s902

32:m3454 s3514    33:m838 s902         34:m842 s898    35:m842 s902
36:m838 s2646    37:m838 s902         38:m842 s902    39:m838 s2646
40:m838 s902    41:m842 s902         42:m838 s902    43:m842 s902
44:m838 s2646    45:m838 s906         46:m834 s902    47:m842 s2646

48:m838
Extent=114038
Mark  min:834     max:3454
Space min:898     max:3514

The aircon is Panasonic no obvious marking on remote, but on back is
A75C2624
4693
see camera phone for air con model

[Franc Carter]

 

Yep,

 

I built a wifi-to-ir bridge, I’ll see if I can hunt up the code

 

cheers

 

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Franc

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[Matt Callow]

I've done some decoding of my AC remote. The main difference between an AC remote and a TV remote is that when you press a button on the AC remote, it sends the whole state of the remote. E.g.
Fan:Auto, Mode:Cooling, Temp:22, Power:On

I don't think its the more normal RC5

One way to decode them is to vary one parameter and see what changes.

But it all you need is to turn the AC off, you could just record the 'AC OFF' command as raw data (mark and space periods) , and then replay it when needed

Matt

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[shykitten55]

Hi Kris.

May I suggest a slightly different approach to the problem?

A few years back I started to worry about my bill.

The A/C has been installed back in '97 and was better for my bill than the "heaters" I used to use in winter prior.

Anyway, one way to maybe help with the power used by the A/C is to put double glazing in.

It cost me a bit but the improvements to heat loss/transfer and noise reduction are amazing!


Hope that helps.

[Kris]

Thanks Cat, but we rent the space. And given the hieght, size and aspect of the windows o don't think it would be economical.

I reckon a whirly bird in the roof might be worth it though.

---

From: shykitten55 <fuzzywu...@gmail.com>
Sent: 31 March 2018 17:52:24 GMT+11:00
To: Robots & Dinosaurs <sydney-h...@googlegroups.com>
Subject: [RnD] Re: Air con decoding

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Sent from my Android device with K-9 Mail. Please excuse my brevity.