Today we put together a 12V alarm system for a farm building located 100 metres from the farmer’s home. When motion is detected in the building by one or two standard , two relays close. The first causes a loud siren to sound, and the second turns on a bright strobe light visible from the farmer’s home.

If the controller is not reset by the farmer pressing an external panel mountable button then after 3 minutes the siren relay opens cutting the sound, but the strobe light is left turned on until the controller is manually reset to ensure that motion detection events are never missed.

If you need something along these lines then let us know. Click here for suitable low power consumption 12V strobe lights and/or low power high volume 12V sirens and sounders for your own projects.