C1101 and keeloq Merlin M842 garage door opener

ESPHome
1

I have a custom circuit that is known to work correctly (i.e. it can decode other RF devices of the same 433.02MHz frequency) that I want to have receive and decode the keeloq signal from a Merlin M842 garage door remote control.
Using the ‘dump’ option of the ‘remote_receiver’ for both ‘raw’ and ‘keeloq’, I see the signals from the other devices and sometime some varying length numbers from the ‘raw’ dume as in:

[12:42:48.759][I][remote.raw:035]: Received Raw: 579, -3032, 276, -427, 226, -1801
[12:42:52.459][I][remote.raw:035]: Received Raw: 551, -3027, 525, -326, 75, -50, 100, -200, 375, -802, 226, -50
[12:43:32.200][I][remote.raw:035]: Received Raw: 529, -2938, 653, -326, 75, -751, 76, -1004
[12:45:10.805][I][remote.raw:035]: Received Raw: 573, -4525

More often than not I get nothing shown.
I ‘think’ the signal uses Manchester encoding with a symbol rate of 2000. Setting those non-default values sometimes gives me:

[12:48:43.197][I][remote.raw:035]: Received Raw: 1062
[12:48:43.207][I][remote.raw:035]: Received Raw: 187, -125, 125, -62, 4121, -937, 686, -125
[12:48:58.550][I][remote.raw:035]: Received Raw: 939
[12:48:58.602][I][remote.raw:035]: Received Raw: 1817, -62, 312, -2132, 1695, -9273
[12:49:05.350][I][remote.raw:035]: Received Raw: 1001
[12:49:05.380][I][remote.raw:035]: Received Raw: 125, -1314

There is still nothing is the ‘keeloq’ dump.

Does anyone have settings for the C1101 and remote_receiver components that successfully interprets the keeloq sequence from this or similar garage remote controls?

(And yes I know that this is not the end of the story due to the ‘rolling code’ nature of signal but at least this is a start.)

Susan

2

433.92MHz.
And I suspect Merlin uses FSK.
Capturing KeeLoq over FSK on esphome can be tricky, afaik remote_receiver works only for OOK.
Leave a side rolling code…
I honestly think it would be much easier to get spare remote and wire the buttons to esp. Or wire esp to the receiver.

3

Thanks @Karosm for your reply.

As I said, this is the start of the journey - I want it to also monitor what other remotes are doing for the garage door so HA keeps track of the state of the door. Its a 'two way" operation that I eventually want to get to. (And yes I know that each remote has its own code.)

Therefore your suggestions might do half the task and that is why I want to understand how to capture the signals.

So, does anyone have any definitive information as to the signal and how to have the C1101 capture it?

Susan

4

Garage doors are tricky. Usually they use rolling codes and a pairing procedure, so you may need something to decode and replay those.