Thursday, October 17, 2019

Monday, September 30, 2019

The Mega Enigma, an Universal Enigma Machine Simulator is feature complete

The menu system has been completed.

All of the enigma settings (machine type, rotor types, ring settings, wheel settings) can now be changed. The plugs, being physical, are not settable via the menu.

A lampfield / keyboard self test feature has been added.

The lampfield brightness can now be changed.

When the settings are changed, they are saved to EEPROM

Pressing the menu button for a few seconds zeroises the machine by returning it to a default configuration and saves that to EEPROM, deleting the previously configured machine. Might write a separate byte to EEPROM to indicate that a memory wipe is in progress in case it is interrupted. Upon boot, the machine will check this memory location and if set, resume wiping EEPROM.

The new cases have arrived, they need assembly.

Demo Video coming soon...

https://www.instagram.com/arduinoenigma/

https://www.instagram.com/explore/tags/megaenigma/

https://gitlab.com/arduinoenigma/megaenigma/tree/master


Saturday, September 21, 2019

Universal Enigma Engine for the Arduino Mega Enigma is working

The Arduino Universal Enigma Engine now handles settable reflectors on 4 wheel machines like the Enigma D, Swiss K, Rocket (R), Tirpitz (T), A-865, G-111, G-260 and G-312. The only features left are the UKW D and the programmable stepping rotors.

Here is a table with the characteristics of each machine.


Here is an older video showing how double stepping on lever machines and gear stepping works. At the time, geared machines did not encode correctly, now they do.


More posts on instagram:
https://www.instagram.com/explore/tags/megaenigma/

Source Code:
https://gitlab.com/arduinoenigma/megaenigma/tree/master


Saturday, September 14, 2019

Mega Enigma Progress: M4 Works

The four rotor M4 Enigma Machine is working 100%. Now lets get the other 20 machines working.

An interesting thing about this simulator is that it is continuously calculating the path through the rotors for the current key pressed.

The hardware allows for multiple key presses and the software is written to use this functionality. For example, if the key A is pressed, the rotors are advanced when they stop, the result of encrypting that letter is shown. If another key is pressed, the rotors stay put and the result of encrypting that letter is also simultaneously shown on the plugboard.

As in the real machine, the keys must be kept pressed until the rotors stop spinning to illuminate the lampfield. Releasing the key immediately turns off the lampfield. Brief key presses advance the rotors, but do not illuminate the encrypted result.

Another thing that is possible is changing the rotors while a key is pressed. The lampfield is updated to show the new encrypted result for the same key with the current rotor position.

If two keys are pressed and the rotors are changed, the two lamps in the lampfield are updated.

A feature that is still not implemented is turning off the lampfield if a key and its encrypted key are both pressed. Let's say that C is pressed and it encrypts to F, if the F key is also pressed without releasing C, both the C and F lampfield lights should turn off since the Enigma Machine circuitry connects the lamps to the rotor maze through the normally closed contact in the key, pressing that key opens that contact.

The plugboard is also continuously scanned, inserting (or removing) a plug while a key is pressed will update the lampfield if that plug is part of the encryption path.

These features make this simulator one of the most electrically accurate out there.

A bonus feature is that the Mega2560 Pro Mini  at the heart of this project uses the same ATMEGA16U2 as the Arduino UNO for USB connectivity. If you happen to have an External Lamp Field for your original Touchscreen Arduino Enigma, it will work with the Mega Enigma as well.




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Source code:
https://gitlab.com/arduinoenigma/megaenigma

View more pictures on Instagram:
https://www.instagram.com/explore/tags/megaenigma/



Sunday, July 28, 2019

Programmable Seven Segment LED Tester is complete

The conclusion to https://arduinoenigma.blogspot.com/2019/06/a-seven-segment-led-tester.html

Here is the finished Seven Segment Tester. All of the available Arduino Nano pins, except for analog input pins A6,A7 and Serial Port pins D0 and D1 are connected. This leaves us with 18 pins to bring to the 3M Zero Insertion Force (ZIF) socket. Any display up to 9 pin DIP can be tested.

Here are some pictures of the device testing a 16 segment display, a 7 segment display and a 3 digit 7 segment display. The common cathode and common anode versions are programmed as test patterns.

Once the Arduino is programmed, the device can work standalone using a 9v battery.














The base is a reused enigme simulator box lid. 


The OSHPark render of the bottom of the board.


A render of the top of the board. 


The boards as they came from Oshpark.com



Here is a video of the test patterns for a 16-segment LED display and a three-digit seven-segment display.


This design may also be used to test IC, it can supply power and ground to the device under test, put values on some pins and verify that the output from the chip is correct.

Saturday, June 1, 2019

A Seven Segment LED tester

The seven segment displays required for previous projects had, on rare occasions, defective segments. In order to test them all, some contraptions were devised.

Here is a calculator without the displays soldered. Testing the display involved inserting the display in the PCB and running a special program that cycles through all the digits.



This is another rig to test a single seven segment display for the Art Installation Project. This one simply illuminates all the digits simultaneously. The Arduino UNO is simply providing 5V and all the digits are hardwired with jumper wires.



Faced with the prospect of testing the 16 segment displays for the Mega Enigma, building another single purpose jig was not an attractive option.


Most of the Led listings on AliExpress shows the displays being tested on some sort of ZIF socket. We will set to build something that works like that.




The following socket was found:


Here is the datasheet for the socket, we'll design a PCB based on these dimensions and adjust it later if needed.

And here is a preliminary PCB design. It is a very simple design where the bottom 9 pins on the socket are connected to an Arduino Nano.




Here is a preliminary design for a laser cut base. This design shares an edge between two pieces to minimize laser cutting time and therefore cost.


Once the socket arrives, the design for the tester and its base will be finalized. This will be a low cost tester, notice only the bottom 9 pins are wired, and that is good enough for the 16 segment displays. A later design might use the Mega Pro Mini and wire all the segments in the socket.

Tuesday, May 21, 2019

Hackaday Prize 2019

We have three projects running on the Hackaday Prize 2019 this year. 
Two are Enigma Simulators. One, the Z30 has never been made into a physical simulator before.

This year, for every skull you give to these, projects, we get $3, so this is a simple way to show support for these projects. If these get enough skulls, we can order the PCBs and parts for free!!!

Thanks!

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

https://hackaday.io/project/165559-at-mega-enigma-a-2560-pro-mini-enigma-simulator

https://hackaday.io/project/163549-a-seven-segment-art-installation

All of our projects:
https://hackaday.io/projects/hacker/72667