Triggering Alarm/Buzzer via the Camera Wires only

[jzobel]

I would like to setup my camera to trigger a 12v doorbell buzzer. This buzzer can have its own power source via a 12V battery. I am trying to figure out how to do this directly with the cameras 5 alarm wires since I am using no NVR. Most threads I can find utilize an NVR for the relay and power.

 

[TonyR]

Does your wires look like the 5 wires on the Dahua camera in this thread? ==>> How to use ALARM OUT and a K80 control power supply

 

[sebastiantombs]

I would suggest that you use the camera alarm out wires to trigger a relay with 10 amp, or higher rated, contacts and install a capacitor, .1ufd or so, across the buzzer to reduce the arching caused by buzzers or other coil operated devices.

 

[jzobel]

Yes the 5 wire version shown here

DahuaWiki

dahuawiki.com

I ordered this for the doorbell sound.

https://www.amazon.com/gp/product/B075JDWTP6/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1

Power source is a 12V battery so I dont need a 120V transformer.

Question is do I still need a relay? The doorbell works by a simple normally open to closed switch.

This wont be always left on. The power source is a 12V system at my hunting cabin. The camera is pointed towards coyote bait and should trigger the doorbell when motion detected.

 

[sebastiantombs]

The current rating of the camera contacts are at, basically, signal level and aren't meant for switching heavier loads in the 100ms rang or more. With an electronic chime, like you linked to, I'd guess a relay might not be needed. Being a cautious type, I'd use a relay just for the added insurance to isolate the doorbell, electrically, from the camera entirely. That's just me being a cautious person.

 

[jzobel]

10/4 So the alarm out wires create a closed loop upon camera trigger? And only those 2 wires are needed?

 

[sebastiantombs]

Correct. I believe it's a solid state closure, not a physical relay closure.

 

[jzobel]

Yup....just got it working. Only needed the two wires. Works perfect. Thanks! No more motion sensor out by the bait.