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Automatic Garage Door

Subject: Automatic Garage Door
From: "Jo" <utomow2005@xxxxxxxxx>
Date: Sat, 15 Jul 2006 12:38:21 +0700
Newsgroups: alt.home.automation, comp.home.automation, ieee.ces.home-automation, uk.tech.home-automation

Hi,

I would like to know the typical interface for automatic/electric garage
door. Is it controlled using 2 relays for power and direction (closing and
opening) or maybe with just one relay (relay on = closing, relay off =
opening)?

Thanks in advance for any input regarding this matter.

Rgds,
W. Utomo








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