I want to extend my Midibox SEQ V4 with CORE_STM32F4 and V4+ firmware that is based on wilba CS frontpanel with midiphy PCBs. But I did not find schematics to check the connector pin signals, if they are compatible. From first sight it looks like it may be possible. Specifically I want to use:
RES-SD PCB to add a SD-card socket (this one is not super important)
MIDI8 PCB instead of using the longer-size 2xMIDI_IO
I2C PCB for 4 MIDI extra outs (I guess multiple of these boards could be used for more midi outs as described here: http://www.ucapps.de/mbhp_iic_midi.html ?)
LINETX PCB for the line transmission to eurorack extension
Eurorack modules (I read they should be compatible somewhere)
Are the connectors on these boards compatible to the CORE_STM32F4 connectors? Is there a documentation on the board schematics (especially the connectors pinout)?
I will have to construct a backplate (drill holes etc.) anyways for all the conectors and only have one MIDI_IO with 4 ports for testing at the moment, so using the new and space-efficient midiphy pcbs makes sense for me, as I need more Midi outs etc. anyways and I am located in Germany, so ordering is easyer.
Looking at the I2C PCB , there are 4 flat-cable connectors at the bottom at the board, what are they good for? I need more Midi outs, not ins, so maybe sticking with the MIDI_IO and using two I2C PCB to get 8 outs may make more sense (especially space wise), the Heidenreich case has not so much space.