gi_joe Posted June 4, 2006 Report Share Posted June 4, 2006 hi.. i know the topic doesn't quite explain what the problem is, but the fact is that i don't know what the problem is either ;)i made a test setup of my sequencer, with 2 lcd's 1 din and ofcourse a core.. everything worked alright, so i decided it was time to mount everything in a case (in my case, mount the buttons/lcd's/encoders on top of a sheet of metal and screw the rest of the boards underneath it, untill i had a proper case)so i did, and after a few days of hard work it's done, but now my setup doesn't show any signs of life! :'(there's not even a midi message on startup, the lcd's don't work, nothing. i am a bit scared that i messed up my pic in the process of mounting everything.. could this be? i probably have some shorts here and there (on the interconnections between boards/lcds, not on the boards themselves), but can that result in a pic not putting out *anything* on powerup? also i'd like to measure some voltages on the boards, but i'm scared i might mess up things even more by accidentally short-circuiting things. at what points will i measure voltages on the core to see if my pic is still alive? could it be that it's not my pic that's causing this behaviour? please help me out. Quote Link to comment Share on other sites More sharing options...
gi_joe Posted June 4, 2006 Author Report Share Posted June 4, 2006 gosh. forgot to mention i'm a total newbie. i disconnected the din's and now it's working.. ::)oh well. ;) Quote Link to comment Share on other sites More sharing options...
gi_joe Posted June 4, 2006 Author Report Share Posted June 4, 2006 instead of opening a new thread with new troubles i'll just stick it in here, hoping someone will read it ;) i'm having some weird behaviour with my lcd and din's now. - my lcd displays weird random characters, with some of the original message partly there sometimes, this wasn't the case earlier today- my din's don't seem to work like they should.. when i hook up only the first 2 dins, the display lights up and i get a party messed up startup screenwhen i only hook up the first one, i don't get anything when i power up. (about the scenario i descibed in the first post. could anyone enlighten me on the way this works? why does my lcd 'respond' to how many din's i have connected, and why is it in an unlogical manner? and ofcourse, what's the quickest way to a working mbseq from here? ;)i have kind of spoiled my credits i believe by starting topics wich i figure out 5 minutes later.. but i guess everybody has to start somewhere. ::)please help me out cause i'm absolutely puzzled.. Quote Link to comment Share on other sites More sharing options...
smashtv Posted June 4, 2006 Report Share Posted June 4, 2006 Sometimes they will act this way if you are using an AC power pack and a metal/non-isolated jack to connect it. More info about your power supply please! :)BestSmash Quote Link to comment Share on other sites More sharing options...
gi_joe Posted June 4, 2006 Author Report Share Posted June 4, 2006 ahh.. well, i'm using a standard external ac/dc 9v 700mA.. i guess the jack that goes into my power-bus is isolated (i mean it isn't metal, but plasticcy) btw i solved the lcd troubles, it was (as always) a loose wire on the core, so no big deal..i'm still stuck on the din thing though.. Quote Link to comment Share on other sites More sharing options...
moxi Posted June 4, 2006 Report Share Posted June 4, 2006 maybe you forgot to sold a bridges on a din module?or that could probably be a short (maybe between a leg of a led and the terminal of a buton in your case, or some metal part)... Quote Link to comment Share on other sites More sharing options...
gi_joe Posted June 4, 2006 Author Report Share Posted June 4, 2006 i found out the cause of the problem: on the non-working board, i mounted the shiftregisters in the sockets the other way around. i got sent 2 brands of registers, one with the little 'dot' on one side, and one with the little dot on the other side.. i got mixed up.. so stupid to find out it is something so small after a full day of cursing at your non-working setup ;)it's working now, except for 1 din, the last one. i know it should be something in the way i hooked up to the 'second' one in the row, or with the shift registers. is it necessary to remove unused shiftregisters? or perhaps should i connect certain unused pins to ground?is it necessary to ground encoders and buttons to the board they are actually connected to? so for instance, i have encoders of step 1-12 connected to DIN2, and 13-16 to DIN3, will i need to connect the ground of steps 13-16 to the DIN3 board? if i'm informed right this doesn't matter, but maybe it does? a little addition to the problem: when i turn the step #16 encoder, the second lcd displays a bunch of 'new' notes. it's quite unexplainable. also the note changes, for some strange reason, while the others don't respond at all. any idea what this could mean? :)also, totally off topic; moxi.. would you mind if i email or message you regarding your 'fabrication de boutons'? ;) i'm quite interested in how you did it. :) Quote Link to comment Share on other sites More sharing options...
moxi Posted June 5, 2006 Report Share Posted June 5, 2006 about button:i will explain all what you need to know, i plan to do a new tutorial but for the while , no more bucks.. Quote Link to comment Share on other sites More sharing options...
gi_joe Posted June 5, 2006 Author Report Share Posted June 5, 2006 alright then.. i'll drop you a line as soon as i find out wtf is causing that last din to not-work. if i hook up the problematic din directly to the core (leaving the other 2 out of the chain) it is working.. so there must be a problem with the connection between 2 of the din's. where do i look? any suggestions? :) Quote Link to comment Share on other sites More sharing options...
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