MIDI Controller Modification

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Re: MIDI Controller Modification

Postby Alexkidd on 26 Dec 2012, 13:22

i'm confused. It is possible or not?! :mrgreen:
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Re: MIDI Controller Modification

Postby Marxon on 26 Dec 2012, 14:07

yeah should be. but in my schematic the led has
wrong polarity >I
it must be:
-----w------I<----_I_-------
---resistor---led---button----
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Re: MIDI Controller Modification

Postby Alexkidd on 26 Dec 2012, 14:34

Ah this is why you're sorry :mrgreen:
Thank you SO MUCH marxon. you've been very helpful. I'll annoy you again as soon as i get my hands on the controller :)
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Re: MIDI Controller Modification

Postby Marxon on 27 Dec 2012, 17:58

but keep working step by step,
please check first the circuit layout like MusicMeister described.
before it's all just guesswork :mrgreen:
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Re: MIDI Controller Modification

Postby MusicMeister on 28 Dec 2012, 20:05

Marxon wrote:yeah should be. but in my schematic the led has
wrong polarity >I
it must be:
-----w------I<----_I_-------
---resistor---led---button----


Actually, it might not be the wrong polarity. ;)

Depends on if the values are switched hot or switched ground. ;) And if the voltage/current across the pad is sufficient to drive the LED.

Of course, you could always use a secondary power source for the LED... But if that's even necessary is all dependent on the existing circuit and the specifics...

The easiest thing to do would be to use a double pole switch and use the second set of poles to activate the LEDs when you push down. Now the trick would be getting arcade buttons that are double pole instead of single pole.
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Re: MIDI Controller Modification

Postby Alexkidd on 28 Dec 2012, 20:15

That one was really confusing. how much do these switches cost? In what case do i need them? sanwa arcade buttons are double pole buttons?
How can i test my circuit to see if the leds will light up?
Last edited by Alexkidd on 18 Apr 2013, 20:40, edited 1 time in total.
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Re: MIDI Controller Modification

Postby MusicMeister on 28 Dec 2012, 23:32

cinq wrote:That one was really confusing.

Sorry about that - didn't mean for it to be confusing.

Part of my comments are driven because I'm more paranoid than most. :)
cinq wrote:Can much do these switches cost?

I have no idea if they're even available or what they cost.

cinq wrote:In what case do i need them?

If the existing circuit is incapable of supporting the power necessary to light the LED's but there is more than one way to skin a cat or to make the LED's light up. ;)

cinq wrote: sanwa arcade buttons are double pole buttons?

No idea... but if I had to guess they're:
SPST NO Momentary

Single Pole Single Throw Normally Open Momentary switches. :D

cinq wrote:How can i test my circuit to see if the leds will light up?

Start by measuring the voltage - and then with proper polarity see if you can get an LED to light up. You'll need to use a fairly low wattage LED though because current is limited. You want to make sure if you hit all the buttons at once you don't cook anything.

If you're using the USB port only to power this circuit then you'll need to keep the total current for the entire device to under 500mA (1/2 Amp) - but it's hard to tell how much it's already drawing. For that you'd have to hack a USB cable and measure the current.

There are LOTS of ways to get what you want and in all honesty, I think I got into the weeds and I shouldn't have.

Start by making the buttons work. :)

Then worry about the LED's. ;)
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Re: MIDI Controller Modification

Postby Alexkidd on 29 Dec 2012, 01:13

Step by step then. one thing at a time. :mrgreen:
I'll probably do a live log or some in this topic in order to help and get helped.
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Re: MIDI Controller Modification

Postby Marxon on 01 Jan 2013, 02:01

Maybe with realtime support via Teamview, Skype, rtpMIDI :mrgreen:

:mrgreen: :mrgreen: :mrgreen:

Happy new year!
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MEMBER OF:

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iPad 4
---------------
Midibox SEQUENCER V4
http://midibox.org/forums/gallery/album/164-marxon%C2%B4s-seq-v4/
Midibox SID V2 Synth
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Re: MIDI Controller Modification

Postby Alexkidd on 01 Jan 2013, 02:20

Marxon wrote:Maybe with realtime support via Teamview, Skype, rtpMIDI :mrgreen:

:mrgreen: :mrgreen: :mrgreen:

Happy new year!


happy new year with great mixes!

Why not?! this sounds great! helpful and easy
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