(AT) Mega Enigma, a 2560 Pro Mini Enigma Simulator

The Arduino Mega 2560 Pro Mini has arrived. The good news is that it is compatible with the External Lamp Field. Below is the Mega sitting on its spot on the simulator. On the actual PCB, it will be soldered underneath the board. The USB connector will stick out through a discreet hole on the back of the simulator.

This device from miniduino matches the Fritzing footprint and uses an ATmega16u2 for the USB connectivity. It can be found on ebay by searching for "mega 2560 pro mini atmega16u2"

While this one is a little cheaper and works fine for other uses, the external lamp field does not have drivers for the USB chip on board this one:

While waiting for parts, I have decided to design a new PCB  for the numbers only Enigma Z30 using only parts on hand:

https://hackaday.io/project/165684-nano-z30-a-numbers-only-enigma-machine-simulator

The board is almost ready for production, can you spot the hidden vias under the G key?

Here is the bottom copper layer. @Benchoff, Is this the latest Fritzing autorouter or is it done by hand?

More pictures and the description of how it was done are here:

https://arduinoenigma.blogspot.com/2019/05/enigma-simulator-pcb-almost-ready-for.html

Next, we will start designing the main board. The main components here are the Arduino Pro Mini and some 16 segment displays. 

The display and the Mega are arranged in a board the same size as the plugboard. A lampfield and a keyboard are designed as well,

A proper Enigma Machine SImulator needs a working plugboard. The Mega 2560 Pro Mini has enough pins. Let's see if a plugboard can be put together in Fritzing.

This is a quick concept thrown together. The holes are custom size vias. The board ends up being around 138mm wide.

An order is placed for 3.5mm Female Stereo Audio Jack Connector panel mount M631. 

This design will use common 3.5mm audio cables, so an order is placed for

6" 3.5mm Eurorack Modular Synth Patch CABLE - BLACK - 10 PACK

This is the board that makes this project possible. It is a smaller version of the Arduino Mega 2560. It has a Fritzing model. A couple of these are ordered.