2013 Pro4X 6M/T
2013 Night Armor ❌terra Pro-4X 6MT
Join Date: May 2016
Location: Somewhere in CommuNewsom's state
Unfortunately, I haven't worked with Bluetooth and Arduino yet. I have worked on my fair share of Arduino projects in the past, and have had to get creative powering things. If you notice you have too much "ripple" even with that DC-DC converter, you can simply add a 1000 uf, 16v capacitor across the Vin and ground, making sure to match polarity of course, to smooth out the DC. I know your motivation for this was to create a control panel for lighting to give you more flexibility with switch locations as the conventional rocker switches do take up a lot of real-estate, which the front panels are greatly lacking.
I can suggest taking into account having a fallback localized controller for the systems. I know you have plans to use your phone to control the whole setup via Bluetooth, but remember, phones can get lost, break, batteries can die, etc. It's a nice additional feature to have for sure, and I like the way you are approaching the problem. There are touch screen displays, about 3.5" in size, or roughly 3 rocker switches in width, that are easily to natively wire to an arduino and the libraries aren't too hard to use and program with. It takes about 12 I/O lines I would suggest SPI bus for the easiest wiring. You will need to keep two of the analog pins free for the touch screen portion to work, but the remainder of pins are fairly flexible, I believe most Arduinos and clones have a 6 pin ICSP port that can handle supplying voltage, ground, MISO, MOSI, clock and reset signals to the device.
In case phone is out of commission, having that backup interface allows you to still use the features that you may or may not depend on, but they will still be an option. The phone can act as a backup in case the screen on the local controls get damaged, this ensures you a bit of a failsafe. I am sure you will see many people mention fail safe designs in many threads here, it is far better to have a solution be over-egnineered and never need some of the features than having something barely meet your needs and fail at the worst possible moment, experience has been a cruel, but fair teacher. Just my $0.02 cents.
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