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Brain Jr Buttons Overriding Each Other

edited August 2014 in Hardware

I am putting together a simple Brain Jr project and I am having trouble with the buttons overriding each other.

  • I would like to use 12 momentary buttons to activate 12 tracks in Ableton Live.
  • The buttons have built in LEDs that I have working using local control.
  •  I have soldered my connections to a LED matrix board and I'm using that to go to terminal strips.
  • "brainjr_213_BL.hex" firmware has been installed onto the Brain Jr board.

When button one is triggered and released I get the proper MIDI signal. Same with button two. When I trigger and hold either button and trigger the other button it "releases" the held button and does not trigger itself.

https://dl.dropboxusercontent.com/u/59599357/BrainJrConfig.jpg

Please let me know if you need any other information, screen grabs, photos. Thanks for your help.

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Comments

  • You'll need to connect a diode between the (-) side of each button and the BR connection on the shield. This will fix your issue. Its being documented now, very sorry for the confusion!

  • Thanks for the response.

    Should the diode be in a particulate direction? Is there a recommended part?

  • edited August 2014

    This is working.

    I found that cathode needs to be towards the board and anode towards the button on the (-) side of the button loop. Both rectifier and silicon diodes work.

    Thanks for your help.

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