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Old 04-18-2022, 02:17 PM   #1
Dannyx's Avatar
Join Date: Aug 2016
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Smile Using car key fob as generic remote control

Good day folks. It's been a while since I've DIY-d anything, so the other day I was thinking if it's possible to use the key fob of my car as a remote for other automation stuff. I have quite a few generic 433Mhz remotes and modules I picked up on Ali for various projects, but instead of having another remote dangling off the key chain, I thought I could use the car's own fob for more than unlocking my car when I'm near it. Say I come home and wish to switch on a light at my front door.

I already tried putting one of my generic receivers in pairing mode and hitting one of the 2 buttons on the car fob and of course it didn't work, despite being the same frequency (433Mhz). As I later learned, there's the matter of fixed vs. rolling codes, so that's not going to work out of the box, at least not with these modules you find all over the web. I know for a fact my fob uses a PCF7946, but there's little info on it and how it operates. The only thing I require is some device to pick up the signal from the fob and turn on a pair of relays: one for the "unlock" button, one for the "lock" button. Sounds simple. I found some devices which claim to be able to receive "rolling codes" for garage door openers, but I'm not sure those would work either and my skills in RF stuff are a bit lacking. Any suggestions ? Thanks.
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