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BIRTHA - Base Interface RV/Trailer Home Automation

Birtha is the name of our RV. Projects and automation are inevitable.

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This will be the document store for how we modify our RV.
The ability to put the slides out and raise the cellular antenna while outside the RV are first on the list. It would be also be nice to have voice control over things like lights and checking the house battery status.

The Plan

We need reliable cellular data, so an omni-directional and rotatable Yagi antenna on a mast will be implemented.  A cellular repeater/amplifier will feed the signal from the roof to a directional antenna inside the RV.

The RV will have its own wifi via an on-board cellular modem capable of multiple carriers.

A simple website will be hosted from the RV wifi with a Pi 3, and from that site, some home automation software will be exposed.

Add physical interfaces via relay boards to the slide switches and nearby lights.  Leave the existing switches in place for the lights, but have them trigger the automation software instead.  This will essentially turn them into 3 way switches with the hidden switch controlled by the automation software.  If the switches are already 3 way capable, then wire them as such.  The relays are SPDT so this will work, and this way everything would still work even if the automation was off.

Tap into the analog signals feeding the black, grey, and fresh water tanks.

Add an RS-485 interface and tap into the communication between the wall panel and the house inverter to get battery and line status.  Later, perhaps actually spoof traffic and trigger things like starting the generator via the AGS system.

Control over the AV systems would be nice as well, and the RV came pre-wired with an HDMI over ethernet 4x4 multiplexer.  I'll need to emit IR to control it and the other home entertainment stuff.

Figure out where to put a projector and screen as we need the space currently occupied by the living area flat screen for other stuff.  I'm partial to using the front power window shade as the projector screen currently with a short throw projector hidden either in the dash or in the upper cabinets.

Lastly, integrate with Alexa, Google Home, or CMUSpinx for voice control over the simple stuff.

This is going to be fun.  :)

  • Systems

    Daren Schwenke04/26/2018 at 07:10 0 comments

    So here are the onboard systems I need to interface with.

    From research, the Magnum Energy inverters, Automatic Generator Start, and user panel all use RS-485 to talk to each other and the read-only part of this at least has been decoded.  As I can set the system to start the generator itself (as that is what it's for), tackling this from the read-only perspective should work for now.

    This panel looks to be just a couple SPDT switches for the slides and some sort of analog interface for the tank/propane levels.  I should be able to simply wire across the slide switches and tap into the analog signals directly.  I don't know the levels involved yet for the analog.

    The single lights controls.  The trim ring snaps off with a pull, but they are screwed in to the paneling with an S2 drive.  I only had a Phillips with me so I'm still not sure if these are SPDT or SPST switches thus far.  There is at least one SPDT switch as the main living area is already 3 way, with one switch at the RV entry and the other in the middle, so I'm hopeful.

    Here is the existing centralized AV HDMI over ethernet switch.  I wasn't able to find anyone who has built a library for sending IR to this device yet, and I don't have a remote for it.  AV switching will have to wait a bit.  

    All the systems thus far are centrally located and within 2 feet of each other.  I should be able to control all the simple stuff from this one location with a relay board.  The same mirco I task with the analog bits will also be intercepting the RS-485 for the house battery status.

    As for the more remote things...

    There are also 4 TV's, but three of them are the same brand and so use the same IR codes.  I'll need at least 3 IR blasters. to cover them over 3 isolated channels.  Annoying.

    The switch panel in the entryway covers the awnings, more lights, and steps and is far enough away from the other panel that I plan on using an RS-485 masters/slave serial link to it with an Arduino driving a separate relay board.

    Lastly I'll need to control the mast rotation and extension.  That's all the way at the back of the RV and so about 10 feet from the main board.  I haven't decided if I want to make that an RS-485 link or just run the wires yet.  I have power there so RS-485 may make sense.

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