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Architecture with two controllers

mysensorsAlarm last edited by
Goal: new alarm system for our house.
Requirements:
- Support of both wireless and wired sensors
- If the home automation controller fails (e.g. power surge), then the alarm system shall remain operational
  My Architecture idea/ proposal:
- ‘Controller interface 1’: only Alarm system logic on a micro controller for reliability (Arduino)
- ‘Controller interface 2’: only status reading (Homeassistant)
  Illustration of situation:
Question:
- Is the following architecture suitable for my main requirement? I do not understand how to e.g. combine the two, serial and Ethernet, controllers
- Can I combine the alarm system logic in the mysensors gateway?
- Other suggestions based on your experience?
- I’ve searched but was not able to find an example of a comparable situation, but if there exists one… 
  Thanks a lot in advance!
  Kind regards,
  Tom
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@NotYetRated Hope you'll find good uses and a fun time while building your sensors.
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@OldSurferDude yes, you are correct. this sensor is capable of 50A continuous, which safely I would make it working at 40A max., but for such an important load as in your case I would go for a beefier one, like the ACS75x, 77x, but at this point I would also change the node's form factor for space and insulation reasons. On my application on the RV I have a max. curr. of 13A running on a AWG14-16 cable (European rules for RVs), so I did not ask myself too many questions beside, of course, safety. About the signal, it will be a sinusoidal signal swinging around Vcc/2. Vcc can be easily measured internally on the ATmega328. On all my DC sensors I measure Vcc at every loop, just before measuring the ADCs. Honestly, when the space is not an issue like in my RV, I would rather use a ring core current transformer, and I would get rid of noise, response time, power dissipation, but over all no need to cut any cable. Long story short, it has been a nice experiment and I used it for 6 months, and then I switched back to my RF-NANO based RS485-Modbus - Mysensors bridge connected to an off-the shelf power analyzer. Just for fun I attach a pic of my 12Vdc sensors installed on my RV. Forgive me for the spaghetti wiring on the right side, but this is an area that needs improvement.
Alexa Fauxmo - Mysensor Bridge Gateway / BLE - Mysensors Bridge Gateway
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@OldSurferDude thank you !
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We are of like minds, Don't like the cloud based controls (that's another discussion). In my case I have a Bryant/Connex system, heat pump, variable speed fan and 4 zones. There's a lot going on: the 4 zones creates 16 profiles. The fan speed for a profile will depend on the indoor and outdoor temperature. The thermal fluid pump also has to be controlled. A profile will have an optimal air pressure, so there's a sensor there. The controller works just fine not being connected to the cloud. But I want to set the parameters remotely, Bryant/Connex can do this. I also wnat the status of the various actuators and sensors to show up in Home Assistant. The signals sent over the RS422 are proprietary. My plan was to reverse-engineer the signals. After doing this I'll have to experiment to get the right mix of air pressue, fan speed and thermal fluid flow for each profile. I'd like to do the same for my AO Smith heat pump water heater. I'd like to follow your progress. OSD
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Architecture with two controllers

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Architecture with two controllers

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Welcome
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Online

11.4k
Users

11.1k
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112.7k
Posts