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Total 9 documents matching your query.

1. Garage door opener electronics (score: 1): Author: Steven Trovato <trovato@computer.net>; Date: Sun, 23 Mar 2003 17:33:27 -0500; Hi all. Does anyone know how a garage door safety reversing system works, from an circuitry perspective? I'm talking about the beam transmitted across the opening. There are two screw terminals on th; /html/shop-talk/2003-03/msg00125.html (8,180 bytes)
2. Re: Garage door opener electronics (score: 1): Author: Ralph Forsythe <rf-list@centerone.com>; Date: Sun, 23 Mar 2003 15:53:17 -0700; I think it's even simpler than you think... AFAIK, the "signal" is simply a switched circuit, with the IR detection part of it forming the "switch". I believe current flows when it's receiving the re; /html/shop-talk/2003-03/msg00126.html (8,841 bytes)
3. Re: Garage door opener electronics (score: 1): Author: Steven Trovato <trovato@computer.net>; Date: Sun, 23 Mar 2003 18:57:03 -0500; But, the transmitter and receiver both attach to the SAME two terminals. That means that the signal is coming back to the same screw terminal that is supplying voltage to the transmitter. /// unsubsc; /html/shop-talk/2003-03/msg00127.html (8,223 bytes)
4. Re: Garage door opener electronics (score: 1): Author: Donald H Locker <dhl@chelseamsl.com>; Date: Sun, 23 Mar 2003 19:26:20 -0500 (EST); No guarantee, but if I were designing the circuitry, the lead that carries power would also serve as the signal -- with nothing interrupting the beam, current flows; when something interrupts the bea; /html/shop-talk/2003-03/msg00128.html (8,885 bytes)
5. Re: Garage door opener electronics (score: 1): Author: Steven Trovato <trovato@computer.net>; Date: Sun, 23 Mar 2003 19:35:47 -0500; The SAME screw terminal that supplies the power to the sensor is also supplying the power to the IR beam transmitter. That means that there is always current flowing, because the transmitter must kee; /html/shop-talk/2003-03/msg00129.html (8,598 bytes)
6. Re: Garage door opener electronics (score: 1): Author: Donald H Locker <dhl@chelseamsl.com>; Date: Sun, 23 Mar 2003 20:07:35 -0500 (EST); Detecting changes in current is quite easy. There are lots of other ways to do this, but most of them would cost more (use digital signal impressed on top of supply current,) so my guess still stand; /html/shop-talk/2003-03/msg00130.html (9,786 bytes)
7. Re: Garage door opener electronics (score: 1): Author: Trevor Boicey <tboicey@brit.ca>; Date: Sun, 23 Mar 2003 21:34:20 -0500; I'm coming into this thread halfway, but I'd postulate that they might use a modulated signal and a few diodes to multiplex two signals on two wires. You can also use resistors to generate another se; /html/shop-talk/2003-03/msg00131.html (8,940 bytes)
8. RE: Garage door opener electronics (score: 1): Author: <Tim.Mullen@trw.com>; Date: Mon, 24 Mar 2003 08:47:47 -0500; I can attest to the last part. I had a connection on one of the sensors go bad, and the garage door refused to close - I had to pull he "emergency" release and close it by hand until I could repair t; /html/shop-talk/2003-03/msg00132.html (8,231 bytes)
9. Re: Garage door opener electronics (score: 1): Author: Steven Trovato <trovato@computer.net>; Date: Tue, 25 Mar 2003 11:51:10 -0500; Thank you all for your replies. To summarize, I've received a lot of educated speculation as to how these work, but no one actually knows for sure. The leading candidate seems to be sensing different; /html/shop-talk/2003-03/msg00134.html (7,925 bytes)

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