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It's done and it's working great! Besides the Arduino Nano and the LCD Display, there's only two resistors, six switches, a Midi Jack and a power jack - that being said, I decided to build this without any additional PCB. The wiring can be found below. I will wrap up the code and put it on github later this week. As a special bonus, I will provide the 3D-printed parts (the Nano holder, so you have access to its USB port and the display pcb standoffs/distance tubes).

If you build this, make sure you have some 2.5 mm nuts and bolts available (I bought this one: https://www.amazon.de/gp/product/B075WY5367/ref=ppx_yo_dt_b_search_asin_image?ie=UTF8&psc=1)











Video, please excuse my bad English:

Enclosure preview:


Not sure where I will put the Arduino itself and how to attach it to the enclosure. I would like to make the USB-Port of the arduino accessible from the outside for Program upload, so there will be another hole on one of the sides or the front.

It's coming together nicely. Got a 2 line display working, waiting on a 4-line LCD-Display for more comfort. Midi is working as well. Here is a preview of two banks I programmed as a proof of concept:



Each of the six buttons can be clicked or pressed long and will trigger midi events (or a series of midi events). There will also be a (series of) midi events fired when a bank is changed.

(updated message to represent the functions implemented in the current version)

I have build a MIDI controller to control my HX Stomp. I call it the "Evening Sun MC6" ;-)

• 6 Buttons
• 4-line display
• arduino-based
• programmable

Components required:

• Display: HD44780 LCD (4 lines, 20 collumns)
• Enclosure: Hammond 1590 XX
• 6 Soft Switches (momentary)
• Arduino Nano
• No addional PCB required

Total costs for these are below 50 €.

Features:

• Programmable: Less easy than e.g. a Morningstar MC6, so no web editor. Changes have to be done in the arduino code (via USB), but the structure of the code is really easy to understand.
  
• Five modes/banks for various combinations of button functions. It can easily be changed by users to provide more banks, if required.
• Everything is customizable, including the display text (and of course the midi messages)
• Unlimited number of Midi Messages with each footpress (only limited by the default memory of the arduino, which should be more than sufficient)
• Two functions per button: Single click and Longpress
• Optional (series) of Midi Messages to be send when a new bank is selected, e.g. to activate a specific preset on the target device(s).

Hello - quite some time since my last post. Just wanted to let everybody know, that there is a new version (4.0) available:  https://drive.google.com/drive/folders/1lKUyPn5B468xeWaGFZhAdqgFoZD4oujD?usp=sharing.

Background: I use my Eoo3 to control an HX Stomp. With the latest Line 6 release (3.11), they changed something in the midi implementation which revealed a bug in my implementation (program changes occasionally failed). It's fixed now.

Sorry to revive the zombie. Matthias, or if anyone knows, is the choice of transistors is critical? Would any high hfe or medium BJT do? Is hfe (or any other particular characteristic) important? I have 5c546, BC550, 2N5088, 2N5089, 2N3904. MPSA18... Just not BC547C.

It should not be critical, 2N3904 should work, just check the pinout. Found here: https://www.quora.com/What-are-substitutes-for-BC547-transistors#:~:text=2N2222%20is%20the%20most%20common%20and%20excellent%20substitute%20for%20BC547.&text=The%20only%20minor%20changes%20are,%2C%202N4401%2C%20BC337%2C%20etc.

Let us all know, if it works.

Here we go:

Starting off with my standard sound completely dry: Fender Sambora Strat into this "Anne Circuit" into a 1x12" Marshall Cabinet loaded with a Jensen Jet C12 Electric Lightning [8 Ohm] speaker. All that captured with a Superlux PRA 628 MK II straight into a an IK Multimedia IRIG into an Iphone (no computer, no compressors or anything). I think there is some digital overdrive added on the recording, forgive me. You get the idea anyway.

Playing with tone control, adding reverb, using a Zendrive first and than changing to a Queen of Bone afterwards. Nothing else in the circuit, even not, if it's seen in the picture (no LAB Preamp, no Delay, no Tremolo).

Showing off the guitar at the very end. Enjoy!

I will try to set something up over the next days.

Enclosure painted and labelled. Sounds Better than it looks.

You should keep the name: "Anne the Layout"

Yes... Bloody German Autocorrect.

Here is everything in one PDF, including the BOM, Pitures and the build notes from this thread.

https://drive.google.com/file/d/1BVvzoLJPlCQG_DycDLihTPnHhYoCmCXr/view?usp=sharing

I'd be up for a board.  How many watts do those things generally put out?

The spec sheet (https://www.mouser.de/datasheet/2/389/cd00001560-1795812.pdf) says 7 Watt. On a 1x12" speaker in a living room, you will have it on 10´o´clock (1/3 of max). I´d say it´s loud enough for an acoustic band with vocals and so, but maybe not for you next slayer rehearsal.

Here we go:




Some more build notes, if somebody goes for a similar approach: C9 (220 uF) should better be lying, not standing for a 1590b. I had one (!) of these very low profile caps here, all the others would have been too high! I had to replace it at assembly time when the pots were already mounted. Now you know, why one of the film caps next to C6 has burn marks ;-)

Use an INSULATED output jack! Shield of the output is not GND!

As said above: Bending and mounting the TDA is a bit tricky.

Yes, I Made the Board. I will Share the circuit Anne the Layout when I'm Back in my Computer.

No... I checked it after a while of playing and could still Touch it... It's Not gering too hot, seriously.