sylwester

Hello, I'm just building my own MIDIBox SEQ v4 and have some trouble with the DIN (Digital Input) modules from SmashTV's Shop. The first two modules are working without any trouble, but a 3rd module doesn't work and all other DIN modules also stop working. I've checked for short-circuits, but I couldn't find any. I've also tried terminating the last DIN module + DOUT module with the resistor + capacitor terminator without any success. My wiring looks as following: - Core32 -> DIN(1) J1 outer pins - DIN(2) J2 inner pins -> DIN(3) J1 outer pins - DIN(3) J2 inner pins -> RC-Terminator The two first DIN modules work perfectly - every button press / logical state change is recognized properly. I'm powering the board via a 7.5V adjustable stabilized transformator power supply. This problem was caused by a wrong resistor network in R31. I had a 10K resistor network instead of 5 x 220 Ohm. Now everything is perfect. Thanks, Sylwester This is how the actual "test" looks like: http://midibox.org/forums/index.php?app=gallery&module=user&user=8354&do=view_album&album=81

Thanks for your answers. Seppoman, I agree with you that OSC/Ethernet is rather a "Playground" feature than some feature that is going to be used "in production" by practical users. I really like the modularity of the project. I rather had this in mind for my rear-panel layout and was thinking that there might be somebody sharing my idea ;) PS: Today I've soldered the STM32-based core and 3 x DIN4X modules. As soon as I'm not ill any more I'll start working on the DOUT module and the front panel wiring. Any suggestions where I can get a 2x40 LCD with backlight for cheap? Got about 20-30pcs of 2x40 LCDs w/o backlight in case somebody needs one for experimenting (HD44780).

Hey, I've been thinking about making some PCB which contains both the ENC28J60-based Ethernet Interface and a SD-Card adaptor (think of putting this on the rear side of a MidiBox Seq v4 etc.). What do you personally think about such an idea? I've seen the existing solutions (e.g. using an old floppy adaptor cable as a socket for prototyping, using a "break out board") but I'm looking for some kind of "solid-state" solution. Best regards, Sylwester PS: Right now I'm building my first MIDIBox device -- the STM32-based MIDIBox Seq v4. Today I've ordered the front panel from Schaeffer (which probably is the most expensive part of the sequencer. I've ordered PCB kits from SmashTV, due to lack of time. It seems like the german customs have stopped them from arriving here. But hopefully I can show you some results soon.