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Sooo, I found some time to do some experimenting, and my findings do not make much sense. Are there two standards for LSDJ sync?

Here is what I did:

I cut up a link cable (GBA-style, but should no matter), and determined Pin 2 (SOUT) to be the blue wire, and Pin 6 (GND) to be black.

So I set up another arduino reading from analog-in 0 and plotting to serial monitor. I connected SOUT to A0, and GND to the ground on the arduino.

Now, if I connect that to a GBA running LSDJ in master mode, I can see the signal on SOUT dropping from HIGH to LOW on every first beat very clearly:

But if I connect that same cable to the Arduinoboy (catskull shield on a cheap china-uno), there is nothing plotted at all. The SOUT just stays LOW:

So, what I observe with gb303 makes sense: SOUT dropping to LOW does trigger the sync.
Thats why it syncs with a real LSDJ, and retriggers constantly with the Arduinoboy. Okay.

But what does not make any sense to me, is that a slave-LSDJ syncs just fine to that very same arduinoboy. How can that be, if SOUT is permanantly LOW? What am I missing?

To rule out the china-arduino, I tried the same with a genuine Duemilanove. But it behaves exactly the same.

I could kind of live with "Arduinoboy has SOUT shorted to GND, so there is no trigger at all, can't work like this", but: it *does* work with a real LSDJ-slave. How can that be?

Im kinda lost here, any suggestions what more to try?

So, I tried around, and what does work, is syncing to midi-notes via arduinoboy mgb mode. So I guess the cable is good, and so is the arduinoboy (clock source is also good, b/c it syncs fine to nanoloop 2)

But I don't get much use out out midi note-in, as the notes won't sustain and are always just one step long. I send notes with longer gate, but they get cut immediately. Manual states "Note off triggered on note off message, or velocity = 0" so my best guess would be that the velocity of 0 of the following step does cut it, although it there is no note data sent with it. Or something like that.

So I would really love to get midi clock sync to work (and program notes from the gb itself).

My cable does only have four pads connected, but these are the pins 0, 1, 2 and ground as specified in the original graphic from Trash80's github:

The +5v is missing, but optional.

Video of the constant retriggering: https://streamable.com/am43dp
Cursor should scroll down, but is only blinking on step 1.

@sloopygoop: As arduinoboy is sending lsdj master sync signal, slaving gb303 to lsdj should be exactly the same as to midi via arduinoboy. But as I'm running out of other options, that would be the next thing to try, just to confirm what part exactly does not work (for me).

Unfortunately my cart and DMG are in Europe while I am kind of stuck in South America rn, so it might take me some more months to check back on that. But I will surely give an update on that when I can.

If anyone can give me a heads-up how to get sync to midi-clock to work in the meantime, I would be really gratefull

Wow, years-old thread and an answer in hours, nice! Appreciate that, as you stated clearly you don't support that shield any more.

I tried with Arduinoboy-master from your Github, tested real quick, seems to behave exactly the same.
Will go more in depth over the weekend, also have a nanoloop-usb-midi laying around, maybe that can at least make it play a note.

Just to make sure: to just sync via MIDI, the correct way would be "sync" on Arduinoboy and "LSDJ-slave" on the gb303, right?!
I deactivated Note, CC and Program Change TX from my MIDI source to make sure to not accidentally reset the sequence. Keeps retriggering the first step over and over.

I use a GBA Sp, but that doesn't matter, does it? My DMG is on another continent, will take me a few months to rule that out....

I have the same question. Looking for a gb-303 :-/

is anybody? I'm also looking for a bleepbloop programmer (non-usb cart)

argh, the webpage still says "2 units left", but apparently these are already sold
I pray I'll notice in time when the last batch is ready for sale...

Btw, anyone tried the arduinoboy with Nanoloop 2.3 (on GBA SP)?