Laslo

Just measured the holes, they're 24mm x 15mm.

Hey guys, I'm wondering if anyone knows a source that sells Polysix style pushbuttons. Visible here http://www.nettilinja.fi/~ahassine/gearland/KorgPolysix.jpg I acquired a polysix case that would be perfect for a midibox and it would be great to have these to complete the look! If i find them i'll post the source here in case anyones interested.

Sorry it's taken me so long to reply, been pretty hectic these past few days. I had a feeling that the isolated bridges underneath the IC's may've come loose, so I completely took the board apart (aside from the resistors and pin headers), replaced the cables and the IC sockets and tried again. This time I occasionally get some buttons working then they jitter. On the first button of the first bundle I get jitter on notes C4 and C5 on channels 1-16. I don't think my multimeter has a beeper setting but it may have some setting that will assist me. I'll keep investigating. Thanks! EDIT: I was re-reading the DIN page and noticed on the description for the J2 port, it read Right now I have the buttons connected in the same fashion on both DINs with a 1:1 connection from DIN no.1 J2 to DIN no.2 J1. Is this all how its meant to be? Thanks again.

Sorry i didnt reply last night stryd, hectic amount of work. I wasn't sure exactly what you meant, so i tested the voltage on the second DIN with my multimeter from VS on J1 to VS on J2, SI on J1 to SI on J2 etc etc. I didn't get a reading on any of them, same with the first DIN though. I may just take it apart and check the wire connections underneath the IC sockets, one of them may've come loose but i don't know how. I'll report back!

Thanks Stryd, I'm about to go to bed, i've got an early uni start tomorrow, but I will give it a shot and report back tomorrow evening!

Thanks for the reply stryd, I gave that a shot, but then they both wouldn't work. One thing i've noticed but didn't think would have an impact on anything is that on the first DIN, i've soldered the resistors all facing the same direction, however on the second DIN, theres a few odd ones out that face in the opposite direction, opposite according to their stripes that is.

Hi guys. Been wrestling with a problem for quite some time now, my first DIN is working perfectly, all 32 buttons, the problem lies in the second DIN connected @ J2. The problem being that its not sending any signals whatsoever, I'm fairly sure the IC's are fine as i've tried each of them in the first DIN with success. The voltages on J2 of the first DIN are the same as that on J1 of the second DIN and I have been over it quite a few times looking for bad solder joints. Wondering if anyone could shed some light on this problem? I'm so close to finishing it! Thanks very much guys.

Right, back in business. It was infact a dodgy 4051 that was the root of the problem, so i'll have to pick up another. Thanks for all the help Pay_C

Arg! Well, while trying to fix that problem, the LCD stopped working for some unknown reason, no black bars, just the back light, so while trying to fix that (resoldering), now nothing works, not signals out of the core. :( So it'll be a while to fix this then i shall try yet again

Sorry it has taken me so long to reply, i've been repainting my room so my internet was down. I measured the voltage as you mentioned and didnt find any irregularities. I may try swapping one of the multiplexers with that bundle to see if that isolates the problem. I shall report back :)

Hi Pay_c When measuring between the outer pins, all pots give 5.1vv, when measuring between the middle and outer pins, as i turn the pot, the voltage goes from 0v to 5.14v. All except the last pot in the bundle which connects to the AIN ground and 5v pins which measures from 0v to 2v. Though this seems to be the same across all pots and it is only this bundle that is affected. I replaced that one pot that went from 127 straight to 60 and that has solved that problem, but still, none in the bundle go lower than 30

Still haven't isolated any issue yet. I might try replacing the one pot that goes straight from 127 to 60 and see if that makes any difference. any other suggestions would still be greatly appreciated

I've checked all pots in that bundle and they're all the same as the others, linear "B" 10k. I'll check the resistance now pay_c, thanks :)

Thanks for your response HL, i'll have to unmount them to see whether they're A or B type, I know they're 'supposed' to all be B type but you never know if they've sent me a wrong one here and there. These are alpha pots too. It seems a bit strange that all the pots in the one bundle would be "A", but could one log pot be influencing the rest in the chain? Thanks again!

alo again. Well i've got my pots all hooked up and it's a great feeling :) Though one little problem is on one bank of 8, the minimum value only goes down to either 29 or 30, even when the sysex created in vmidibox64 is made to be 0-127. Also the second pot in the bundle goes straight from 127 down to 60 with any movement then gradually down to 30 over the pot turn. I've triple checked the solder joints but of course i will check more, just curious to see if anyone has run into this problem or knows a solution? Thanks :)

I made sure as to not ever touch the 232 PIC, it's still in its wrapping :P As i was typing this post i managed to find the problem, a slight short solder that i had missed earlier. Thanks for your reply Thorsten :) Laslo.

I had the same problem of fiddling around with the LCD and then my core stopped working, i eventually narrowed it down to the PIC which i reburnt but still to no avail, so i tried a second PIC i had, burnt that and it was alive again. So possibly the PIC died but im about as far from an expert as you can get.

Hi guys, Well I ended up getting the core back on track, reflashed the PIC, got a new LCD and all that jazz and its working great. Installed MIOS, copyright message and ready appear. All is well. :) However when I attach the LTC module and try it, the MIDI in LED stays lit and the LCD reverts back to the black bars. In MIOS studio i get these messages: 00 00 7E 40 00 0E 0B 01 F7 00000002129888 ms | Sysex message: F0 00 00 7E 40 00 01 F7 00000002129888 ms | Sysex message: F0 00 00 7E 40 00 0E 0B 01 F7 00000002129909 ms | Sysex message: F0 00 00 7E 40 00 01 F7 00000002129914 ms | Sysex message: F0 00 00 7E 40 00 0E 0B 01 F7 00000002129919 ms | Sysex message: F0 00 00 7E 40 00 01 F7 00000002129919 ms | Sysex message: F0 00 00 7E 40 00 0E 0B 01 F7 00000002129919 ms | Sysex message: F0 00 00 7E 40 00 01 F7 00000002129919 ms | Sysex message: F0 00 00 7E 40 00 0E 0B 01 F7 00000002129937 ms | Sysex message: F0 00 00 7E 40 00 01 F7 00000002129937 ms | Sysex message: F0 00 00 7E 40 00 0E 0B 01 F7 00000002129937 ms | Sysex message: F0 00 00 7E 40 00 01 F7 00000002129937 ms | Sysex message: F0 00 00 7E 40 00 0E 0B 01 F7 00000002129937 ms | Sysex message: F0 00 00 7E 40 00 01 F7 00000002129965 ms | Sysex message: F0 00 00 7E 40 00 0E 0B 01 F7 00000002129965 ms | Sysex message: F0 00 00 7E 40 00 01 F7 00000002129965 ms | Sysex message: F0 00 00 7E 40 00 0E 0B 01 F7 00000002129965 ms | Sysex message: F0 00 00 7E 40 00 01 F7 00000002129983 ms | Sysex message: F0 00 00 7E 40 00 0E 0B 01 F7 00000002129987 ms | Sysex message: F0 00 00 7E 40 00 01 F7 00000002129987 ms | Sysex message: F0 00 00 7E 40 00 0E 0B 01 F7 00000002129987 ms | Sysex message: F0 00 00 7E 40 00 01 F7 over and over again, quite rapidly. I've double checked the polarity of the capacitors and made sure the right resistors are in the right places etc. 2 ain modules connect fine without any troubles. I'm planning on using it as extra MIDI out and MIDI thru ports. I've tried it with the two IC's and without. Any ideas/suggestions would be a great help! Thanks!

Thanks alot for your reply Doc, straightened things out for me. I'll keep you guys posted on what i do with this :)

Alo. :) I've been running an idea over in my head of a light bulb rig where each bulb can be turned on or off via a midi message. As far as I can tell, I would need a core module (naturally) and a dout module with a ULN2803. I have a few technical questions though. 1. Do I interface the ULN2803 to the 74HC595N in the dout module or can I just put the ULN2803 into the socket without needing a 74HC595N? 2. Do the +/- points of the bulb or the bulb socket just connect to the dout output pins/ground pin? 3. Is there a way to have the bulbs turn off after a period of time? i.e 500ms or 1s. Would this be software or hardware based? I'm sorry if the answers to these questions are obvious, just thought i'd get a definitive answer. Thanks very much :)

Turns out i had a bit of a midi loop going on, so that was fixed and MIOS uploaded successfully as well as the MB64 program. I unplugged the LTC module as i found out it was causing the random sysex messages, so i'll have to work that one out. Still no LCD though. :(

Thanks Thorsten I will give that a try. :) Just to make sure that the MIOS was infact installed correctly, i reuploaded the mios_v1_9c_pic18f452.hex file. Firstly it would say "Starting upload of mios_v1_9c_pic18f452.hex Hex file contains code in MIOS range, forcing reboot!" But then it would not progress from there. So i put it on manual mode, which then said: Sending block 00000400-000004FF Sending block 00000500-000005FF Sending block 00000600-000006FF Sending block 00000700-000007FF Sending block 00000800-000008FF Sending block 00000900-000009FF Sending block 00000A00-00000AFF Sending block 00000B00-00000BFF Sending block 00000C00-00000CFF Sending block 00000D00-00000DFF Sending block 00000E00-00000EFF Sending block 00000F00-00000FFF Sending block 00001000-000010FF Sending block 00001100-000011FF Sending block 00001200-000012FF Sending block 00001300-000013FF Sending block 00001400-000014FF Sending block 00001500-000015FF Sending block 00001600-000016FF Sending block 00001700-000017FF Sending block 00001800-000018FF Sending block 00001900-000019FF Sending block 00001A00-00001AFF Sending block 00001B00-00001BFF Sending block 00001C00-00001CFF Sending block 00001D00-00001DFF Sending block 00001E00-00001EFF Sending block 00001F00-00001FFF Sending block 00002000-000020FF Sending block 00002100-000021FF Sending block 00002200-000022FF Sending block 00002300-000023FF Sending block 00002400-000024FF Sending block 00002500-000025FF Sending block 00002600-000026FF Sending block 00002700-000027FF Sending block 00002800-000028FF Sending block 00002900-000029FF Sending block 00002A00-00002AFF Sending block 00002B00-00002BFF Sending block 00002C00-00002CFF Sending block 00002D00-00002DFF Sending block 00002E00-00002EFF Sending block 00002F00-00002FFF Sending block 00003000-000030FF Sending block 00003100-000031FF Sending block 00003200-000032FF Sending block 00003300-000033FF Sending block 00007C00-00007CFF Sending block 00007D00-00007DFF Sending block 00007E00-00007EFF Sending block 00007F00-00007FFF Upload process complete So i thought all was good. However when i reboot the core, it sends alot of sysex messages followed soon after by the random midi messages (as the unused pins are not clamped to ground) This is what the midi in box says: Sysex message: F0 00 00 7E 40 00 0E 0B 01 F7 00000000018160 ms | Sysex message: F0 00 00 7E 40 00 0E 0B 01 F7 00000000018164 ms | Sysex message: F0 00 00 7E 40 00 01 F7 00000000018166 ms | Sysex message: F0 00 00 7E 40 00 0E 0B 01 F7 00000000018170 ms | Sysex message: F0 00 00 7E 40 00 01 F7 00000000018175 ms | Sysex message: F0 00 00 7E 40 00 01 F7 00000000018187 ms | Sysex message: F0 00 00 7E 40 00 01 F7 00000000018190 ms | Sysex message: F0 00 00 7E 40 00 0E 0B 01 F7 00000000018193 ms | Sysex message: F0 00 00 7E 40 00 01 F7 00000000018195 ms | Sysex message: F0 00 00 7E 40 00 0E 0B 01 F7 00000000018199 ms | Sysex message: F0 00 00 7E 40 00 01 F7 00000000018201 ms | Sysex message: F0 00 00 7E 40 00 0E 0B 01 F7 00000000018205 ms | Sysex message: F0 00 00 7E 40 00 01 F7 00000000018207 ms | Sysex message: F0 00 00 7E 40 00 0E 0B 01 F7 00000000018210 ms | Sysex message: F0 00 00 7E 40 00 01 F7 00000000018213 ms | Sysex message: F0 00 00 7E 40 00 0E 0B 01 F7 repeat for a while then: 00000000026219 ms | [D0 00 00] Channel 1: Channel Pressure value: 0 00000000026220 ms | [D0 00 00] Channel 1: Channel Pressure value: 0 00000000026220 ms | [D0 7E 00] Channel 1: Channel Pressure value: 126 00000000026220 ms | [D0 40 00] Channel 1: Channel Pressure value: 64 00000000026221 ms | [D0 00 00] Channel 1: Channel Pressure value: 0 00000000026221 ms | [D0 01 00] Channel 1: Channel Pressure value: 1 00000000027470 ms | [82 00 00] Channel 3: Note Off C-1 velocity: 0 00000000027471 ms | [82 7E 40] Channel 3: Note Off F#9 velocity: 64 00000000027471 ms | [82 00 01] Channel 3: Note Off C-1 velocity: 1 00000000028719 ms | [F6] Tune Request 00000000030470 ms | [C0 00 00] Channel 1: Program Change no: 0 00000000030470 ms | [C0 00 00] Channel 1: Program Change no: 0 00000000030470 ms | [C0 7E 00] Channel 1: Program Change no: 126 00000000030470 ms | [C0 40 00] Channel 1: Program Change no: 64 00000000030471 ms | [C0 00 00] Channel 1: Program Change no: 0 00000000030471 ms | [C0 0E 00] Channel 1: Program Change no: 14 00000000030471 ms | [C0 0B 00] Channel 1: Program Change no: 11 00000000030472 ms | [C0 01 00] Channel 1: Program Change no: 1 00000000035219 ms | [90 00 00] Channel 1: Note On C-1 velocity: 0 00000000035219 ms | [90 7E 40] Channel 1: Note On F#9 velocity: 64 00000000035220 ms | [90 00 0E] Channel 1: Note On C-1 velocity: 14 00000000035221 ms | [90 0B 01] Channel 1: Note On B-1 velocity: 1 I hope i haven't blown the pic up :( If I move sliders or pots on my midi keyboard (through which the core is routed) it comes up correctly in the midi in section. Does this all look ok? Thanks again.

I've quadruple checked all solder junctions, unsoldered them and resoldered them a few times and i am positive that everything is as it should be. MIOS is installed and the MB64 program loaded in. But still i get the top bar of black blocks and half the lower blocks black. They disappear when i move the contrast pot a bit. I checked between VDD and the other points on the core with a multimeter, all except pin5 (r/w) and B+ read as 5.14V I found out that the company i bought it from sent me the wrong pin sheet, so i was right with the gnd and vdd switched around. Any help would be greatly appreciated! ???

Sorry i should've already stated that i have loaded the MIOS and a program. The core sends a bunch of random midi messages as per usual if there are no pots/buttons present

In my last efforts, i switched around VSS and VDD and for some reason, the LCD works but is just displaying black blocks. It was just strange. It says 1 and 2 are VSS and VDD respectivley, but for some reason 2 is VSS and is VDD. Just plain strange. It's probably something wrong with how i did it. Any ideas on the black blocks? should i reverse all wires like with 1 and 2? I've tried changing the trimpots but that just fades them out.