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

["ABLE_1" <royboynospam@xxxxxxxxxxxxx>]

Get a 120v TDR DPDT to break the circuit to the audible siren for 61
seconds.  This will eliminate the need for a battery backup.

On the other hand you could also use a APC UPS to power the unit.  It would
surely no longer be a low tech alarm but it would work.

OR you could purchase a small 4 zone HI TECH security panel and all your
problems would go away.

Good Luck!!!


> 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.
>
> Thx u
>