433Mhz AM Signal

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alexturner
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Joined: Tue May 05, 2020 1:18 pm

433Mhz AM Signal

Post by alexturner » Tue May 05, 2020 1:22 pm

Hey there!

I'm trying to reverse engineer a fairly simple lighting system in which the lights have a prebuilt super-het receiver module in them and a simple IC. The 'on' and 'off' signals are as follows (attached). Any idea what the encoding is?

Image
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Alex

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Airwind
Posts: 41
Joined: Wed May 23, 2018 8:27 pm

Re: 433Mhz AM Signal

Post by Airwind » Thu May 14, 2020 5:20 am

Hmm, that's an odd looking signal.

It doesn't seem to be PPM, morse or manchester, but the signal is clearly OOK. Maybe it's some sort of PWM (although the gaps are a bit tiny), but its difficult to tell from this data alone since you only got two samples, and they only differ in a single bit. Normally 433 MHz OOK signals have a preamble followed by some data like a device serial number and some commands. Do you happen to have another device from the same manufacturer and maybe record that signal to see how they differ?

Regards.

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