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

["nick markowitz" <nick-markowitz@xxxxxxxxxxx>]

Since you have modified the unit you have violated the UL listing and using
this unit puts you at very high liabilty if the unit would fail and be
pinpointed as causing a fire etc.
your insurnce carrier would drop you if they knew  you were playing with
such things scrap it and get a cheap alarm.

<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.
>
> Thx u
>