Newbie Seq4 problems

MIDIbox SEQ
1

Hi,

so I’m all fairly new to this midibox stuff, so please bare with me.

I’ve completed building my seq4 but am having some difficulties.

When I power on all seems good with the stm32. I’ve loaded the latest hex file, it reads the sd card and seems well.

However the din and dout doesn’t seem to be working at all. No encoders, buttons or leds do anything. The douts and dins are getting power.

The boards are bought from smashtv, so I don’t think that is a problem. I’ve looked for shorts etc and have so far found nothing. I’ve tried unplugging various parts of the din’s and try and get just one section interacting, but know luck.

I’m sure I’m missing something very simple. Could it be that I have not copied the correct MBSEQ_HW.V4 file into the sd? I must admit that I was struggling on how to correctly get that file onto my SD and probably did it wrong..

Anyway, hope that wasn’t to much of a ramble.

Any suggestions would be appreciated!

Cheers

Al

p.s. my soldering iron just literally blew up, the cable got so twisted it shorted itself. Woops!

2

Hi Al,

If you take out the SD card, it starts with initial settings.

Are you shure you have got power, if not you have to put a jumper next to R31 array to select 3.3V or 5V

Lots of succes.

Greetings, Pim

3

as synthy, test without sd card if you got the initial settings

also test (multimeter bipbip mode) that S1/S0 of J8/9 go were they are supposed to.

4

Did you install the 220 Ohm resistor array R31a/b/c/d on the MBHP_CORE_STM32 module?

Best Regards, Thorsten.

5

Hi,

thanks for the tips.

So I took the SD card out and checked that S0/S1 go to the right places. I do have power selected. I have the 220 ohm resistor network (although I made my own with 4 resistors as I haven’t got an array).

On 4th(or 5th, lost count!) inspection I saw a couple of grounds were missing.

The result: after powering on the firmware loads and now some leds light. Every 4th led of the step leds (1st, 5th, 9th and 13th) are lit.

On power up Track 1 led flashes a few times then goes out. Layer A is lit as is Edit led.

Apart from this there is no change, the encoders and buttons do nothing.

I feel like I’m getting closer though. Any ideas?

Thanks again

Al

6

mastomo had similar problems it was bad wiring :

continue to check using bipbip :thumbsup: (continuity of ground / 5V lines + no short circuits)

be sure about your wiring and hwcfg.v4 file

do you use a matrix like wilba or not ?

7

Hi,

my design is based on the seqv3/4 layout, not wilba’s.

I’m not sure about the hwcfg.v4 file. Is that the one I’m supposed to put on the sd card?

Thanks

Al

8

if you followed TK basic design you don’t need sdcard to test. the card is just used to store patterns or sessions for example.

TK basic design :

buttons http://www.ucapps.de/midibox_seq/mbseq_v3_din.pdf

leds http://www.ucapps.de/midibox_seq/mbseq_v3_dout.pdf

9

Yes, the 2 examples are the way I wired it, or meant to wire it!

I’m trying to find an error in wiring right now. To narrow down any errors would it work to unplug all the din’s apart from one jumper and test the encoders or pots that are connected to that jumper?

That way it might eliminate errors that might be elsewhere…Or does everything have to be connected for it to work?

Also I’m assuming vs is common throughout. Is that correct?

Cheers

Al

10

unplug all the din’s apart from one jumper

yep

I’m assuming vs is common throughout. Is that correct

Gnd is gnd, 5V is 5V. that’s all. You are correct

I remember that some DIN modules of Smash TV (R3 ?) were false on their labels for D0 … D7. Check his “datasheet”

11

check that every encoder and switch has at least +5V at one pin, that every LED is connected to ground for its small lead (anode)

and not very sure that a DIN can be connected to a DOUT. You need to do an Y cable from the corefalse a DIN can connect a DOUT (at least for R5)

did you swap the shift registers ?

12

Hi,

so I checked the din’s and they are correctly labeled. But in doing so I found my error. S1 on the din “in” is not labeled. So I had wired S1 to S0 on J9. Doh! Now it appears to be working. Wicked!!! On to testing and trying to delve into how much this sequencer seems to offer! Sure I’ll only be scratching the surface though…thanks for your help, sorry for wasting your time with my stupid error!

I do have one more question.

I’m not sure how I’m supposed to copy the correct setup file into the SD card.

Cheers

Al

13

Great! And now have a lot of fun! :slight_smile:

Note: the labels are SI (like serial input) and SO (like serial output)

Best Regards, Thorsten.

14

MISO MOSI for thoses who knows ..

how I’m supposed to copy the correct setup file into the SD card.

edit file for your needs with textedit, save and copy it to the root of SD Card

there are some folders to add :

/sessions

/backup

/sysex

keep an eyes on the walkthrough

and it must be formatted in DOS (fat16)