Re: Home Depot Motion Sensor, On when power is turned on.

["alarman" <alarman2000@xxxxxxxxx>]

> Trying to build a low tech alarm.
> Bought a Home Depot Motion Sensor 180 degree Heath / Zenith for
> floodlight.
> Open the case, modify the connection  of the internal 24 V DC relay.
> Now, it is normally open and the contacts are not connected to any of
> 120v line. Stable, as long as 120V power remains on. Good for driving
> 12 V siren (will add relay if necessary).
>
> PROBLEM: Powering up always energizes the relay for about 1 minute
> (warming up??). So after power blackout, will get false alarm, the
> siren will go off for 1 minute.
>
> Any solution would be appreciated.

Scrap it. Spend a hundred bucks and get a cheap alarm panel and keypad to do
exactly what you want.
js