Reverse Engineering a 433MHz Motorised Blind RF Protocol | Hacker News Reader

Reverse Engineering a 433MHz Motorised Blind RF Protocol

nickwhyte.com

70 pointswolframio9 comments

Nice read but I would use rtl-sdr and SDR tools to reverse engineer this kind of stuff. There are lots of good tools can be used for this purpose in SDR community like this one:

http://www.rtl-sdr.com/waveconverter-an-open-source-rf-rever...

Nice write-up! - I strongly recommend looking at dspectrum for those interested in reversing these kind of devices:

https://github.com/tresacton/dspectrumgui

"The goal of this app is to make it trivial to demodulate common RF signals, and provide a digital worksheet for your reverse engineering efforts."

The author identified a similar workflow for breaking down these packet capture bits, and linked to other potential methods. I'd say his process was an interesting read!

This guy did it the hard way, I automated my lights in a similar way with simple command line tools (./listen <pin> to get code and ./send <pin> to send.)

See here: https://home-assistant.io/

Hey there, I'm actually the author of the linked post. Yes whilst you're right about doing this the hard way, this wasn't really what I was wanting to do.

In the post I actually outlined that I had actually captured enough data from a handful of remotes that I could have replayed these captures to control the blinds (and I even had a rig set up to do this).

But that's not what I wanted to do. I was interested in working out what was happening with these remotes and being able to generate as many arbitrary remote codes as I wanted.

Going the step further to reverse engineer the protocol is something I did as a learning (and fun and challenging) exercise. I've definitely picked up skills through this process that I can apply in similar projects later down the track.

Hey there yourself! Great article. I posted it to https://www.reddit.com/r/ReverseEngineering/comments/6nmu43/...

Nice write up! I wanted to do this in my place and have one less reason not to

Thanks, feel free to hit me up on Twitter (@nickw444) if you happen to have any questions :)

Will do, currently have smaller 1" roller blinds so have to find the tubular motors that fit inside of them.

Rollertrol.com carries some but they are quite a bit pricier than the full radius ones elsewhere.

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