Home › Forums › Ideas / Suggestions / Feedback › SMMw Hazarai Mod – preset footswitch

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  • June 15, 2010 at 10:39 pm #80366
    DWBH
    Member

    I really like my SMMH. And I think it’d be great to have an extra footswitch to cicle all the saved presets (instead of reaching down, turning the knob and clicking it).

    If EHX would do that mod, would pay for it.

    June 16, 2010 at 5:30 am #109497
    julian
    Moderator

    I bet you could do it with a bit of hacking an arduino. EHX won’t mod their pedals sadly :(

    June 16, 2010 at 6:33 pm #109516
    DWBH
    Member

    Well, it’s not an easy thing to do.

    First, it’s a 4 layer pcb – full of that cool digital wizardry. Then, without a schematic, we aren’t going anywhere.
    Hazarai has that JTAG connector which is used to upload the software.
    Being it digital, it could be easily programmed to accept an extra footswitch.

    June 16, 2010 at 7:42 pm #109520
    julian
    Moderator

    I understand that. But I think there’s a way to hack it.

    The hazarai knob is a rotary encoder:

    http://en.wikipedia.org/wiki/Rotary_encoder

    All you have to do is make an addon box (Which would have a lot of wires feeding to the SMMH) that is wired up in parallel with the onboard rotary encoder. The PWM functions of the Arduino could emulate the rotary encoder’s square waves.

    You could program it a way to use one switch to perform all the functions, or you could use multiple switches, which would be easier.

    June 16, 2010 at 7:50 pm #109521
    DWBH
    Member

    Yeah, I was trying to figure out the solder connections to the pcb in a gutshot but no luck. May have to peek inside my pedal this weekend.

    June 16, 2010 at 8:04 pm #109524
    julian
    Moderator

    If you can access where the hazarai knob is soldered in, it’s definitely doable.

    I’d bolt a nano or an XO sized enclosrure to the side, and rewire the input jacks to be in the additional enclosure. Wire up power, and wire an arduino and a switch or two or three in.

    The arduino you’d have to program of course, but the software is free. . . the board costs 25-30 bucks, and hooks up VIA USB.

    June 16, 2010 at 8:22 pm #109529
    DWBH
    Member

    Yes, I’m familiar with the Arduino thingie… I was hoping I didn’t have to resort to other ‘devices’.
    Another problem is that besides being able to chosing the mode I want (what the encoder does), it has to activate the saved preset (that’s what the switch does).

    Darn, it’d be nice if it wasn’t to tricky. I’ll take a lot at it this weekend.

    June 16, 2010 at 10:10 pm #109532
    julian
    Moderator

    Well that function is just a momentary switch. You could have a 2nd momentary switch on the same unit, or program the arduino to emulate a momentary switch hit a couple milliseconds after it emulates the encoder.

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