polosid Posted May 17, 2009 Report Share Posted May 17, 2009 i need to control only one dout module..i connected only the pins 1,11,12,13,14(crystal)31,32pin 19,21,22 to the doutand midi in at pin 26my pic works on a common pcb, but not on my vectorboard!!!all the connections to the pic and to the optocoupler are right, the power level is ok... what am i missing? Quote Link to comment Share on other sites More sharing options...
nILS Posted May 17, 2009 Report Share Posted May 17, 2009 What are you missing? Some parts maybe?The pins you list are correct and should be sufficient, but it's really hard for us to guess what the problem is without further info. Do you get an upload request? Did you do the MIDI troubleshooting? Do you have pics? Quote Link to comment Share on other sites More sharing options...
polosid Posted May 17, 2009 Author Report Share Posted May 17, 2009 ok, i added this connections6 to 1kohm to 5v18 to 10k to 5v20 to 10k to 5vand it works.... Quote Link to comment Share on other sites More sharing options...
polosid Posted May 17, 2009 Author Report Share Posted May 17, 2009 i wonder what is the very minimum configuration for the core, when a dout nly has to be controlled... Quote Link to comment Share on other sites More sharing options...
nILS Posted May 17, 2009 Report Share Posted May 17, 2009 That's interesting - I build a proto one without the additional pullups and it worked...That _is_ the minimum config. You could get rid off the pullups if you by modding MIOS or just go with a way smaller chip (PIC16F88 comes to mind). Smaller chip would mean more programming though as MIOS won't run on it. Quote Link to comment Share on other sites More sharing options...
lylehaze Posted May 17, 2009 Report Share Posted May 17, 2009 I have seen that kind of failure when RB5/PGM/Pin 38 is allowed to float during programming, but here it is supposed to go to the LCD, which some people leave disconnected anyway.The CMOS inputs will _usually_ float high all by themselves, but it not reliable. RB5 low can make the chip enter "Low Voltage Programming Mode" during initial programming.If I were adding pullup resistors, that would be the first one, ESPECIALLY on a programmer board.. those few moments between erasing a chip and re-flashing it with the "LVP Disabled" option are the trickiest. Quote Link to comment Share on other sites More sharing options...
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