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mxmxmx edited this page Apr 11, 2019 · 30 revisions

main board:

building the module should be straightforward; just follow the silkscreen ...

NB:

  • the unmarked passives are 100n
  • the resistors labelled "LED" are ... for the LEDs. as per the BOM, use ultrabright LEDs and correspondingly large resistor values (typically, that'll be something > 10k, depending on preference)
  • voltages to check (once populated): does the LM1117 output 5V? does the ADP150 output 3.3V? does the LM4040 output -10V?

top side, populated:

bottom side, populated, w/ teensy 3.2 attached:

prepare the teensy:

  • you have to cut one trace, to separate V_USB and the external/eurorack PSU. this is the trace:

control board:

  • there's just one (ummarked) passive on there, that's the resistor for the "learn" LED. (again, the value will somewhat depend on your preferences / choice of LED).
  • LED anode (long leg) < > square pads.
  • ignore the electrolytic cap on the very top of the board (near the top-most potentiometer); or if you have, you can put in a subminiature 1uF or the like (> 25V).
  • also: don't forget you need two stereo (!) jacks for the midi input and output; and (as always) it'll make sense to fit the panel first before soldering the jacks/pots.

firmware:

  • There are two ways of getting the firmware onto your module:

    • Method A: upload a/the pre-compiled HEX file. this is easy and quick. or
    • Method B: install the Arduino IDE and the Teensyduino add-on, and compile the code yourself.

  • either way, you’ll need: a micro-usb cable (make sure this isn’t for charging only, but data transfer).

  • NB: the following steps assume that you have cut the usb trace (which is a safe thing to do), see above.

Method A.

step 1): download the teensy loader app.

step 2): download the hex file: releases.

step 3): load the file.

  • make sure a USB cable is connected to the Teensy, and that the module is powered up
  • press the program push switch on the Teensy board (on the back of the module)
  • (you should briefly see a progress bar as the firmware is uploaded)
  • if not, click the program icon, or choose program from the operation menu in loader app.
  • that should be it.

Method B.

step 1): get the IDE + teensyduino add-on.

  • if you don’t have it already, you need to install the arduino IDE as well as the teensyduino add-on.

step 2): clone or download the firmware source code repository to your computer.

  • clone from https://github.com/mxmxmx/CV2Midi or download the .zip file. use the master branch (which is the default); the develop and other branches contain code which may or may not contain bugs.

step 3): compile

  • open the file called C2M_X.ino. now make sure you:

    • select teensy 3.2/3.1 in Tools > Board. and
    • select 120MHz optimized (overclock) in Tools > CPU Speed. and
    • select Faster (= o2) in Tools > Optimize, then
    • hit compile ... and download to your board

step 4): calibrate

  • if this is a newly built module, proceed to calibration.

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