I have a Velux blind with a remote to control them. According to the manufacturer they use rolling codes. I know my sonoff RF bridge cannot recreate the codes correctly. The manufacturer sell a bridge, but it’s 80 Euros which I don’t really like to spend. Are there any other options that I am currently unaware of? Any help/ideas I would appreciate!
ciB
You need an RF sniffer. If you’re not willing to buy the bridge you could build one like this https://www.google.ie/amp/s/z4ziggy.wordpress.com/2014/06/27/rf-sniffer-open-gates-cars-and-rf-remote-controlled-devices-with-ease/amp/
A lot of car keyfobs use rolling codes also, this may help you find more resources about rolling codes
Neither of those two posts will help. You can sniff as many codes as you like but without knowing the way the rolling code is generated you are shit out of luck. Even rolljam is no use in this case (and more expensive than the bridge). Buy the bridge.
I doubt there’s any major encryption involved in a Velux blind code. I’m sure if you sniffed the codes you would recognise a pattern. If nothing else it would be an interesting project.
I reckon you could nail the codes with this https://m.gearbest.com/smart-home-controls/pp_255607.html but to be honest I’d just buy the bridge and be done with it.
Thanks for your replies. I’ll do some testing, but I also agree that there is probably no (convenient) way to avoid the bridge
VELUX use the IO Homecontrol protocol - same as some Somfy products, and it can not be cloned or replayed. You can buy the KLF 200, or use dry contacts on the small remote. The KLF is two way, and will give you status updates regarding positions.
No one had any luck reverse engineering the velux io home control protocol. But you can hack a velux remote and use relays to “press” the buttons on the remote.
It’s ugly but it does work.
I used a 2 channel (one for up and one for down) tasmota compatible relay board, and a cheap 2nd hand remote:
(The remote no longer functions, I just used it as a convenient top for my 3d printed case - holds the pcb and batteries for the remote)
Btw the top photo was my 1st attempt where I powered the remote from gnd/3v3 supply on the relay board. Seems it blew the remote 
don’t know why.
So now my v2 uses batteries for the remote.
Is that the KLF 200? If so, can you please share your source for the 80 EURO buy as they are $400 in NZD?
I took this approach with my Somfy remote.
Nice write up!
just realizing I wrote my comment in a way that it sounds like that link is my project, it was one of the items I used in my research.
Hi James, @hijinx
Digging up this thread. Could you help me understand how you achieved your setup (i. E. Wiring, parts and software)
I am in the same situation with a similar remote and unfortunately have no clue how to progress…
Best regards
