GND vs GNDREF isolation

[IraSch]

How do you intend ground isolation to work? Is there another option other than shorting pins 2&3 on J15?

I can see the need to isolate everything on the "diode" side of the opto-isolators from the rest of the system, but how do you intend to do that?

[taconsultingllc]

For complete isolation between the zones and the remainder of the circuits, J14 and J15 are intended to be in the "isolated" position (i.e. 2&3 for J14 and 1&2 for J15). The schematic is being updated so that both jumpers will be in the same position in the future.

This feature is only intended for externally powered boards. That way the power and ground planes can be isolated from the wESP32 and other logic circuits. I'm working on a manual to aid in understanding the configuration and features of the board.

[taconsultingllc]

If you have any suggestions or features that you think would make this a better product, please feel free to share them with me. I'm working on the third revision and I already have a handful of additional features that I want to add based on feedback from folks like yourself.

Thanks for taking the time to dig in and review the schematics!

[IraSch]

I’m very interested in your project. I currently have a Napco Magnum 850 system from the 80’s (which still works well). I previously added a MKR1000 to it so that if it goes into Alarm, it send SMS texts to me with the status. But the board has no way to arm and disarm other than via the keypads, and they are encoded. So a remote interface isn’t possible as an add-on to it.

I’ve already started on a project very similar to what you have, but since your project is so close to completion, I would be looking at using it instead once it becomes available.

Some of the features I’d be looking for are:

• Ability to use it with 4-wire hardwired smoke detectors. The “detector” part would work as-is with your system, as long as smoke detector zones were always “armed” (unlike burglar zones that would only go into alarm when the system is armed). However, the trick to supporting these detectors is that when the user resets the system, 12V power to the detectors needs to be dropped momentarily. That resets them (assuming the smoke condition is cleared). Heat detectors would work as-is – they aren’t powered – they are either self resetting or designed for one-time use and need to be replaced once they activate.

• I’m sure you already have provisions for battery backup, but that doesn’t help if home power goes down and you lose the internet. So you would need some kind of alarm reporting that doesn’t require a wifi connection. I’m designing for a Particle Boron for notification (alongside the main processor), which could be an add-on to your system (or any other cellular device such as the MKR1500) .It would need to obtain details of why the system activated. Since it is a cellular device, alarms would still get reported to someone/somewhere.

• Some kind of keypad support. I have 3 keypads for my current system, and part of what I developed supports a capacitive touch screen at each location to manage the system (on-screen keypad for PIN entry, on-screen buttons for arm, silence, reset, test, zone history, etc.).

• I’m guessing based on the 3 relays that things like alarm horns or speakers can already be supported. Is there a way for the system to support a different alarm/siren tone for burglar vs fire?

There’s probably more, but these are the first few things that come to mnd.

Looking forward to the final project.

Thanks,

Ira

From: taconsultingllc @. Sent: Saturday, November 02, 2024 4:22 PM To: taconsultingllc/hornet-nest-alarm-panel @.> Cc: IraSch @.>; Author @.> Subject: Re: [taconsultingllc/hornet-nest-alarm-panel] GND vs GNDREF isolation (Issue #2)

If you have any suggestions or features that you think would make this a better product, please feel free to share them with me. I'm working on the third revision and I already have a handful of additional features that I want to add based on feedback from folks like yourself.

Thanks for taking the time to dig in and review the schematics!

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