![]() The rest of the wire run is five conductors to the alarm. Three wires connect directly to the Genie’s screw terminals the fourth must be spliced into the wire from the close limit switch. The connection is a four conductor wire from the opener ( Figure 1) to a junction box ( Figure 2) near an AC outlet where the 12 VDC is introduced. While it is easy enough to step over the safety beam, I felt the common nature of these devices was enough to detect a casual intruder or a child entering the garage. ![]() The switch LED is detected from the opener’s close limit switch, and the alarm is triggered from the Genie’s safety IR beam. I cannot see my garage from my house, so I wanted the opener switch to light when the door was open and have an audible alarm if anyone entered the garage. If in doubt, check that the opener switch connects the #1 and #2 screw terminals to open and close the door, and that the safety beam signal is on terminal #3 and is a 3 ms pulse train that is interrupted when the IR beam is broken. While I use it with a model IS550, it should work with many Genie models (all Intellicode screw drive models from 1997-present) that share a common sequencer board #31184R. I have seen several simple alarm circuits in Nuts & Volts through the years, but this one is a little different in that it connects directly to popular lines of Genie garage door openers.
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