Total idiot can’t work things out - midi controller - multiple usb out

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Bobfossil1

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Hi there

These are all probably stupid questions and I'm really sorry - I’m a musician not an electronics/programming expert....

I want to make a midi foot controller to control 3 guitar pedals, a switcher and (maybe) an amp. I want to have a big display and potentially send DMX signals too, so I was thinking about using a raspberry pi running pure data in addition to the teensy, using the teensy just for generating midi signals and the rpi for the rest.

I think I understand how to program the teensy (although I’m struggling with expression pedals!) and do a button & led matrix.

I’m currently struggling to work out how to get the midi signal out to the rpi and to the pedals and powering the teensy. Would a powered usb hub work with the teensy as host or not? Are there simple ways to achieve this? I’m totally clueless and don’t understand technical terms I’m afraid....

Any help gratefully received.

Thanks (and sorry for being thick!)

Bobfossil1
 
I should add - I only need one usb out for the pedals (I think) - was going to use a usb to midi converter then a midi splitter to feed them. Oh - and I don’t intend for the teensy to receive midi information. Just send.

Thanks
 
Bobfossil1 said:
Are there simple ways to achieve this?
Click to expand...

Yes, there are ways, some rather simple, some less simple...

But to answer your question, I need to know a little more about what "this" means. MIDI can be done in a few different ways. There's traditional serial MIDI with 5 pin DIN connectors. USB MIDI can be USB device or USB host.

I realize you may not know these details. But if you could even just show us the specific pedal and other stuff you're using, photos or links to clear info would go a long way towards understanding what you need.
 
Cool - thanks

I’m looking to send PC and CC messages only to:

an ES8 switcher https://www.boss.info/global/products/es-8/
a gt100 https://www.boss.info/us/products/gt-100/
2 x line 6 m5 https://uk.line6.com/m5/
and (when I can afford it) a BluGuitar amp1 http://www.bluguitar.com/english/AMP1.html

Via a Roland um1 https://www.roland.com/us/products/um-one_mk2/
and a powered midi splitter http://www.kentonuk.com/products/items/utilities/m-thru-5.shtml
and by usb direct to the rpi

I expect there are better ways of doing it, but I already own the um1 and the splitter. One problem I foresee is that the um1 is bus powered.

All 4 pedals/switcher are din only (5 pin although 3 pin would probably suffice). The amp uses a trs connection for midi but if I do buy it I can get an adapter which will work fine.

Thanks for your help!
 
Sorry for being a total dimwit, but what value resistors do I need? I see that they should be 47ohm, but what wattage? Thanks and apologies!
 
Yes, use at least 1/4W.

If the resistor connected to 3.3V gets shorted to ground, it will dissipate 0.23 watts (3.3 * 3.3 / 47), so you probably don't want to use less than 1/4W rated parts if you want this failure mode covered. Of course, the power should be minimal (approx 0.04W peaks, only during ~half the data) in the normal cases where the cable doesn't fail.
 
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