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Bumping for some quick reassurance, the sooner I get some the sooner I can finish this mod.

Holy crap, this is sooo awesome!!!!!!!!!!

Update, I accidentally had it on channel 2, not the whole time, just when the mpk25 native program is up it automatically goes to channel 2. (I never use the program, in fact, trouble shooting this arduinoboy was the first time I used it) With cubase open and proper midi routing IT FINALLY WORKS!!!!! 3 DAYS AND IT WAS ALL BECAUSE I HAD THE WRONG SWITCH!!!!! YESSSSSSSSSSSSSSSS!!! I'M GETTING DRUNK TONIGHT TO CELEBRATE AND JAM!!!!!! Not like i'm an alcoholic or anything, just looking for any reason to get drunk off wine...wait a second...

FUCK YES!

That's seriously just my luck though, the wrong damn switch, haha.

Cheers Syn and Trash80

LAST UPDATE: Just for those who stumble onto this thread with the same problem.

The proper switch makes all the difference! Make sure you have an Open SPST Momentary Pushbutton Switch. My earlier MIDI problems when I was trying to force start mGB was due to a defunt optoisolator. There was no continuity between pins 2 and 3. There were only 2 optoisolators at the store, one was in nice packaging and the other was in fucked up packaging. I obviously got the nicely packed one first, but you should never judge a component by its packaging because it ended up being broken!

Thaank you, i'm off to get a momentary push button!

Also, can you tell me what the right code is for force starting mGB?

I've thought up some elaborate experiments to make sure all the parts work on their own. They do. Every hardware part works. The problem must be the code. I am clueless in this department. Please help!

I can visibly see my computer sending midi data; if I unplug the cord and plug it in my keyboard, my keyboard receives the data and plays the notes. I'm not sure how to use the serial monitor in the arduino program, but when I open the box it has nothing so I'm assuming it isn't receiving data. This is my second optoisolator and the last one the store had. I'm sure it works on its own due to continuity testing between relevant pins. There are no shorts and the pins are all securely held into the arduino. I'm now assuming "0x04, //mode" is mGB because LED 6 lights up when I restart the board and 0 counts as a mode, which would make 4 - mode 5.

Please help!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Alright, I know double posting is usually frowned upon in forums (in this case quadruple posting), but this board moves slow enough that I figure it's OK.

Anyways, the video I posted is really worthless, so hopefully these pics will help.

http://www.imagebanana.com/view/zc0zznk2/DSCN1876.JPG

http://www.imagebanana.com/code/ehpbw3va/DSCN1872.JPG

http://www.imagebanana.com/view/zf4gk4be/DSCN1873.JPG

Won't let me embed the pics with the  tags

So this morning I took everything apart and put it back together again. No mode cycling this time, but still no button response. I've tried wiring pin 3 straight to the SPST button and the SPST button to ground, taking out the 2k resistor, and the button will then shut off/on the gameboy itself; don't know if that's useful information.

And here I thought that the hardest part to get going would be the midi connections themselves, unless it still is the hardest part, in which case it's not very reassuring!

UPDATE: I've tried bypassing the whole button select mode and force start the arduinoboy into mGB mode. I set forcemode to 4 and put alwaysUseDefaultSettings = true. My akai mpk25 is outputting midi but no sound from mGB....

UPDATE2: I've checked the actual DIN plug with my continuity option on my volt-ohmeter along with all the pins of the optoisolator. Everything checks out. I've made sure my akaiMPK25 is outputting midi data on channel 1. Still nothing.

I've tried force starting mode 4 and 5 because i'm not sure which one is mGB. In mode 4, the 6th LED lights up. In mode 5, the first 3 LEDs light up. In all cases the LEDs don't stay lit up.

I don't know what I should do with pin 3 since i'm force starting to mGB. I've tried taking out the switch but leaving the rest of the connections in tact. I've tried putting pin 3 straight to ground; and through the 2k resistor to ground. I've also tried taking off pin 3 completely. Still nothing.

I guess my only option is to buy a new 6n138 and hope to god that works. Any help appreciated, or at least any acknowledgment that I exist in this thread will help too. In retrospect I probably should have just started my own thread. Actually, if a new 6n138 doesn't work I may just start my own thread.

Also: It's not shown in the picture, but i've added the 4.7k resistor suggested by nitro2k01

Alright, I know it must be something with the switch, upon further research that is usually to blame. I tinned the DMG-07 wires just in case, although I know it wasn't a problem because the arduino would still remain on after pulling the USB out. The LEDs flicker on upon restart and "re-flashing", so no problem there. I've checked everything a million times against trash's schematic and 2 player's schematic. (
http://2playermusic.tumblr.com/post/703 … arduinoboy) No connections where there shouldn't be.

Anyways, the arduino no longer cycles modes, but the button doesn't have any affect. I've tried 2 other SPST switches, although they were both toggle switches and not push buttons. I've also tried the suggested code change from up above. Nothing. This is getting a bit frustrating, any help appreciated! I already bought my bottle of 2 buck chuck expecting to jam out tonight! I'll keep troubleshooting. Do you guys want photos or videos? I can do either...In fact, i'll upload photos and make a video if requested.

Also: Should I ground the shield from the DMG-07 or something. Right now i've just twisted it off to the side and have done nothing with it.