Some of you may recall a similar project from back in late 2017. I've been pretty busy and just recently had time to re-visit this project - and I'm actually getting parts on order!

17-Jul-2020:

Boards have arrived: The DINuino-MEGA-B prototyping board. FYI, this name means that it's meant for an Arduino "Mega" sized CPU boards (also smaller ones, like UNO's), and the CPU board mounts to the bottom of the PCB. This allows you the flexibility to stack on some standard Arduino-compatible shields too, to round out your intended "system".

Actually I forgot to order parts - so I have to do that now... I've been ordering a lot of parts lately and projects sometimes slip through the cracks.

Prototyping board notes, POWER distribution:

Externally, this prototyping board expects 24VDC (nominally a 12-25VDC range).

Internally, there are two SMPS regulators: 9VDC which feeds directly into the Arduino board's "VIN" pin, and also 3.3V/5V (selectable) rail which is intended to power your custom circuitry which you're adding onto the Arduino.

If you look closely at the pics of this prototyping board - you'll see two sets of pads/holes. 

The larger pads are meant for your through-hole parts & IC sockets, or whatever you want to mount to them. These pads are not connected to anything on/in the board. Use them freely.

The smaller pads are a secret convenience - for wiring up power & ground!

These little pads are connected to the internal POWER and GROUND plane on the board. To use them - simply solder a bit of 28AWG wire from your IC/device, over to the nearest pwr/gnd pad. The POWER plane pads have a circle around them. The GND plane pads do not.

Over in the power supply section, you can then select (via a jumper) whether the 2nd SMPS regular will provide 5V or 3.3V. You can then also choose to drive the internal POWER plane with this voltage (or not). It flexible and lets you define what your main PCB power rail needs to be. You could even change the 3.3/5V rail to something else - if you want to change a voltage-divider resistor.

10-Jul-2020:

All metal enclosure parts are on order!

"DINuino-Mega-B" prototyping boards are also on order!

I think the boards will arrive in a week or two.

The metal will likely take a week longer.

Some details:

Baseplate:

As shown, it has several hole patterns to accommodate a range of configurations:

* Arduino UNO or MEGA sized board: Mounted all by itself (and with its shields). Can be mounted face-up or face-down.

* DINuino prototyping board: With room underneath for an Arduino UNO or MEGA sized board.

Cover:

Generally comes "blank", so you could cut your own holes. The initial batch of covers will be pre-cut to fit nicely with the DINuino-Mega-B prototyping board.

Side-plates:

Generally come "blank", and they're symmetrical. However, the initial batch of left-plates will have appropriate connector holes for a standard Arduino Mega 2560 board (power & USB).