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Control RF Extender with 433MHz USB Transceiver from PC?

 
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steviehs



Joined: 20 Jan 2018
Posts: 2

PostPosted: Thu Jan 25, 2018 5:59 am    Post subject: Control RF Extender with 433MHz USB Transceiver from PC? Reply with quote

On the search for a solution to control my IR devices from other Smart Home components I had the idea if it could be possible to use one of those 10$ USB 433MHz universal transceivers to sniff and record the signals which are send from my xsight touch to the RF extender and replay those signals controlled by software on the PC with the USB transceiver.

Before I start digging into that more deeply and ordering another new gadget: are there any serious cons, which make this project not feasible at all? (e.g. strange modulation, encryption etc.pp.)

Or is there already such a project out there and I have not found it?
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Barf
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Joined: 24 Oct 2008
Posts: 841

PostPosted: Thu Jan 25, 2018 2:55 pm    Post subject: Reply with quote

Of the 315/433/868 MHz protocols there are "complicated" and "simple" protocols around. The "simple" protocols are definitely tractable with know-how. Possibly the most used "simple" protocol is the one used by remotely control power outlets sold under names as Intertechno (Germany and Austria), Duewi, KlikAnnKlikUit (the Netherlands), One for All, Elro, etc. The simple protocol has 16 "house numbers", in general called A to P, 16 devices within each "house", and each device has an "on" and "off" command. I did some research and came to the conclusion that it should be called "arctech". It turns out to be remarkably similar to the IR protocols. I have managed to get at the IRP form for it:

Code:

{0k,388}<1,-3|3,-1> (<0:2|2:2>((D-1):4,(S-1):4),40:7,F:1,0:1,-10.2m)+ [D:1..16,S:1..16,F:0..1]


(D for house number (A=1 etc), S for device, F=0 for off, F=1 for on, IIRC.)
It is contained in IrScrutinizer, so it can generate these signals. To send it, a cheapie TX-433 module (Google!) connected to an Arduino (any) is ideal. My Arduino firmware does this, and can be used directly from IrScrutinizer (use "Girs Client" as Sending Hardware).

Capturing/"sniffing" signals from an existing RF remote is considerably harder, one reason is the automatic gain contol of the RX-433 tends to pick up a lot of backgroiund noise, But it may not be necessary if using a known protocol.

Another TODO is to attack the "complicated" protocols; I am fairly confident that we can successfully decode at least a subset of those. Wink
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Barf
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Joined: 24 Oct 2008
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PostPosted: Sun Jan 28, 2018 8:46 am    Post subject: Reply with quote

steviehs, had a look at it? Another project you should have a look at is this, aiming at controlling an IR/RF (315 AND 433 MHz) Broadlink hub. (I think it is useful for capturing/sniffing too.)
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xnappo
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Joined: 30 Dec 2003
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PostPosted: Sun Jan 28, 2018 11:32 am    Post subject: Reply with quote

Yeah, I was going to mention the Broadlink too - I think it might do what you want..
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steviehs



Joined: 20 Jan 2018
Posts: 2

PostPosted: Mon Jan 29, 2018 3:36 am    Post subject: Reply with quote

Hi,
I had a look at the Arduino project and used rtl_433 to get an idea of the protocol - I saw something, but right now my lack of understanding does not help me in interpreting it. As I understand right now, the xsight rf protocol is not decoded yet. I doubt that it makes sense to work on a relative rare and discontinued product. So going for the Broadlink transmitter would be the easier solution... or setting up a RPone with lirc as transmitter...
Thx for your help!
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