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A comment on OpenSesame – A device that can open fixed-code garage doors in seconds. Parent comment

Re:OpenSesame – A device that can open fixed-code garage doo... by userbinator on Thursday June 04, 2015 @08:34PM (#9663156)
By the way it is very surprising a description of the 12-bit Genie protocol does not appear to exist online.

Look at the datasheet for the IC they use. 2^12, as it's known, is a very common code and the ICs out there implement only a handful of variations on it.

The other common variants are 3^9 (19683 codes), 3^12 (531441 codes) and 3^18 (387420489 codes).

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Re:OpenSesame – A device that can open fixed-code garage doo... by mrb on Thursday June 04, 2015 @08:41PM (#9663176)
The remotes I reverse-engineered were universal ones with generic MCUs, so their datasheets weren't useful: Skylink model 69 with an EM78P468N, and Skylink model 39 with an HT48R30A-1.
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Re:OpenSesame – A device that can open fixed-code garage doo... by userbinator on Friday June 05, 2015 @04:17AM (#9664429)
A bit of a shame that they used an MCU instead of an encoder/decoder ASIC, since they could've implemented something better. The fixed-code remotes I've seen use a standard IC like an HT12E.

If those weren't OTP/mask ROM, reflashing them with a different firmware (maybe even a simple rolling code?) could be an interesting exercise...

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