# 16x4 blm with dio-matrix and dout module possible?

**URL:** <https://forum.midibox.org/t/16x4-blm-with-dio-matrix-and-dout-module-possible/18998>\
**Category:** MIDIbox BLM\
**Created:** [April 11, 2015, 4:46pm UTC](https://forum.midibox.org/t/16x4-blm-with-dio-matrix-and-dout-module-possible/18998 "2015-04-11T16:46:55Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Alasdair\_Moon](https://forum.midibox.org/user_avatar/forum.midibox.org/alasdair_moon/32/537_2.png) [@Alasdair\_Moon](https://forum.midibox.org/u/Alasdair_Moon)\
**Post date:** [April 11, 2015, 4:46pm UTC](https://forum.midibox.org/t/16x4-blm-with-dio-matrix-and-dout-module-possible/18998/1 "2015-04-11T16:46:55Z")

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Hi folks,

I saw the wiki of the 16x4 BLM board

[16x4blm [MIDIbox]](http://www.midibox.org/dokuwiki/doku.php?id=16x4blm)\_pcb

and got my hands on one from a bulk order …

but I was wondering .. could I build my own BLM 16x4 by using standard dio and dout boards??

If I read the wiki well I need 2 DIN shift registres and 6 DOUT shift registers .. so I could use

one DIO Matrix board and a second DOUTx4 board too, right? ..

Seeing this pdf from the dio wiki page I’m unsure if not only one dio module is enough

[http://www.ucapps.de/mbhp/mbhp\_dio\_matrix\_8x16buttons\_8x8leds.pdf](http://www.ucapps.de/mbhp/mbhp_dio_matrix_8x16buttons_8x8leds.pdf)

Do I really need the dual color leds?? Hmmm .. maybe if tracks have different lenght ..

My question is .. could someone show me how I should tconnect the buttons and led to the shift registers?? .. best in form of the nice pdf files tk provides us with.

Advantage for me would be that I can bring the buttons in line with the Seqv4 wilba design and also use the same switches …

Or would it be much easier to use the MBBLM via Lemur .. for Lemur now is available on Android too???

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<div class="post-metadata">

**Author:** ![latigid\_on](https://forum.midibox.org/user_avatar/forum.midibox.org/latigid_on/32/107_2.png) [@latigid\_on](https://forum.midibox.org/u/latigid_on)\
**Post date:** [April 11, 2015, 5:54pm UTC](https://forum.midibox.org/t/16x4-blm-with-dio-matrix-and-dout-module-possible/18998/2 "2015-04-11T17:54:43Z")

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Did you want to build your own BLM PCB (either fabbed or on Veroboard)?&nbsp;

&nbsp;

If so, it’s more than possible but involves some work:

&nbsp;

[http://www.ucapps.de/mbhp/button\_duoled\_matrix.pdf](http://www.ucapps.de/mbhp/button_duoled_matrix.pdf)

[http://www.midibox.org/midibox\_seq\_blm\_ext/](http://www.midibox.org/midibox_seq_blm_ext/)

&nbsp;

&nbsp;

But if you have the PCB already, you have everything you need to make it work, the SRIO chain is onboard via SMDs.

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**Author:** ![Alasdair\_Moon](https://forum.midibox.org/user_avatar/forum.midibox.org/alasdair_moon/32/537_2.png) [@Alasdair\_Moon](https://forum.midibox.org/u/Alasdair_Moon)\
**Post date:** [April 12, 2015, 1:26pm UTC](https://forum.midibox.org/t/16x4-blm-with-dio-matrix-and-dout-module-possible/18998/3 "2015-04-12T13:26:15Z")

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Exactly that pdf i was looking for … 64 button + duo led .. ty

And yes .. I wanted to use dot matrix boards for the switches, leds and diodes .. wire them as matrix with verowire or copper wire like this

> **[BLOCK TRANSFORMATOREN 100-g enamelled copper wire on coil, Ø 0.28 mm |...](https://www.reichelt.com/de/en/shop/product/100-g_enamelled_copper_wire_on_coil_0_28_mm-57179)**
>
> 100-g enamelled copper wire on coil, Ø 0.28 mm Enamelled copper wire by BLOCK TRANSFORMATOREN - Reliable delivery ✓ favourable prices ✓ For business and private ✓ Order online at reichelt elektronik now!

So if i use one dio matrix and one dout .. i have all the SR i need and only need to alter the blm part of the config file .. great