Hi everyone,I was wondering if anyone has messed with a IR beam on a garage door. Im building a project and it doesnt seem that the beam is a simple high/low when it is broken. Anyone know exactly how they work.I see a DC voltage on the 2 wires but it doesnt toggle high to low or visaversa. It does change but only a small amount. I would like to use a interrupt input to detect this too.Thansk for any help
I don't believe the IR sensors are simple photodiodes, they communicate with the door opener with some proprietary protocol.
The beam does indeed, as i suspected, contain a pulse stream. I found this out by using a scope and I can see the pulse stream. It is running at around 155hz (yes hz). I checked my neighbors and he has a genie garage door opener and his is the same.
Got it figured out.I'm going to post this so anyone else who might want to know this can use it.The beam does indeed, as i suspected, contain a pulse stream. I found this out by using a scope and I can see the pulse stream. It is running at around 155hz (yes hz). I checked my neighbors and he has a genie garage door opener and his is the same. Now I'm not saying that all manufactures use the same freq, but it is odd that carftsman and genie are the same. This doesn't pose a problem. The pulse stream goes away when the beam is breached, so it's either there or not. This makes it simple for the arduino and myself to use.I'm am going to use a 555 (that's 555 timer) and a make a missing pulse detector, as soon as the beam is breached the 555 will transition, the interrupt in the arduino will see this and I'm on my way.Thanks all for your suggestions.Asta bro's
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