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

["Stanley Barthfarkle" <sbarth@xxxxxxxxx>]

<hermanto@xxxxxxxxx> wrote in message
news:1168897106.958504.151210@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> Hi,
> 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.



$75 worth of new professional alarm parts would accomplish your goal much
more easily.
$40 worth of used (panel & keypad) & new (motion, siren, & backup battery)
parts would also do it.