Can a RF signal be replicate from an audio capture ?

Hi guys,

I'm still trying to decode a 433mhz / (16 channel DIP switch) remote signal. I got 3 remote to control many devices (up to 16), it's anoying cuz I have to get track of all 3 remote to use 3 devices. Chances are high to fail, cuz everybody lost a TV remote once in a while, just imagine with 3 tv remotes!!

My goal is to capture the 16 channel and embedded them into a single arduino remote.

Bassicailly this remote came from China and I cannot get the signal code decoded by RF24 module and Arduino Uno but thanks to Neil I've decoded all the other remotes!!!

Becuz I don't have any Oscillator, the only way I can 'capture' the signal is with a 1/8 audio jack and a audio recording software. It work and I can see that each channels have differents 'sound/signal modulation. I've seen this on many forum but I haven't been able to decode my audio channel, since it don't seem like anything people are getting on thoses forums...

Decoding RF link using a PC soundcard | Hackaday

Here a waveform exemple, I got.

If this method is right, what are the next step to convert theses audio informations to arduino data ?

Best regards.

Seb

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neilk over 8 years ago

The first reference you gave looks fascinating and straightforward - if you look for his blog to pick up the fine details.

The second reference looks, how can I put it, expensive!!!!!!

I would look further into the audio approach.

Neil
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neilk over 8 years ago

The first reference you gave looks fascinating and straightforward - if you look for his blog to pick up the fine details.

The second reference looks, how can I put it, expensive!!!!!!

I would look further into the audio approach.

Neil
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redgreenblue over 8 years ago in reply to neilk

Yep, there must be a 'home made' way to doing this...
Thank Neil for looking this !
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redgreenblue over 8 years ago in reply to neilk

To follow up on trying to replicate the signal, the other way around is to replicate the circuit. Right ?!

so I've started to analyse it. While I'm waiting to receive the USB dongle cuz audio signal didn't work inside the SDR software.

There one chip without any text or information. (red)
Does anybody know what it is ?

1-On the right side the part with the R433, is defenitively similar as a RF24 transmitter, the resistor have same values and connection is the same. This is pretty easy to replicate. The other resistor that does not match, are there for the 12v 23a battery I guess.

2- A button, with 102 resistor (1k) and Led. Must be connected to 'input' on the unknown chip.

3- There a DIP switch, you can see 3 output from the unknonw chip to the DIP switch (on the other side *8 solder).

This has to work.
Any help would be deeply appreciated!!!
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neilk over 8 years ago in reply to redgreenblue

That anonymous chip is responsible for the RF signal encoding. Unfortunately you can't identify it.

There a several chip/chipsets used to encode RF for remote control and some of them are mentioned here:

https://github.com/sui77/rc-switch/wiki/List_KnownDevices

This might help

Best of luck

Neil
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redgreenblue over 8 years ago in reply to neilk

Gee thanks, it help but also don't. You said it, I can't identify it...
I guess I'll get no significative help on this one, pretty vague and non-standard..
Doesn't matter, I'll try to investigate further by myself.

Thank Neil, always a pleasure to have advices from you !
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