What's the best for reverse engineering an RF Remote

Show off any of your RTL-SDR or cheap SDR related projects.
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Wkhdkl
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Joined: Thu Sep 22, 2016 7:20 am

What's the best for reverse engineering an RF Remote

Post by Wkhdkl » Wed Nov 30, 2016 9:14 am

As part of a larger project, I would like to be able to replay signals of this remote. It's a remote for a temperature controller MAX4473EUA from Maxim Integrated, operating at 433MHz and it looks like it's using ASK modulation.
MAX4473 datasheet
I've bought an RTL-SDR dongle and recorded the remote signal using SDRSharp (see Audacity screenshots). Each button press (increase/decrease temperature) produces 6 packets that are exactly the same.

From reading a few blogs it seems that the common assumption is that each fat/thin pulse corresponds to 0/1. Is that a reasonable assumption? Also, do I need to replay all 6 packets and does the interval between the packets matter? Any sense in how accurate my timing (ie baud rate) needs to be?
Image
The image was a little big.If you have trouble watching the image. I feel sorry about that. :roll:
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Re: What's the best for reverse engineering an RF Remote

Post by Username » Tue Dec 20, 2016 3:41 pm

Hi
Every Company who have Engineers with a Brain use Rolling Codes.
Its very hard to break them. You need to find out what the Key is.

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