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Thread: How to self-made a knob to control volume

  1. #1
    Variable Bitrate Frigor's Avatar
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    How to self-made a knob to control volume

    I know there are a lot of rotary knob like PowerMate, but they are too expansive and often too big...

    I'd like to embed it in place of the cigar lighter knob

    I looked around and found this:
    http://www.phidgetsusa.com/viewproduct.asp?SKU=1052

    But, how to integrate it in a working system? has anybody done something similar?

    Thank you...
    BMW E36 Project [ =======§== ]
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    Lilliput 7" Touchscreen - Epia M-10000 - HQCT 1.0 FM Radio - 2.5" 80Gb - USB GPS
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  2. #2
    I'm sorry, and you are....? frodobaggins's Avatar
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    yes they have, seen a few, don't know the links
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  3. #3
    MySQL Error jcdillin's Avatar
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    if I remember correctly someone just modified the scroll wheel from a mouse, I dont know if you want to get that deep into it, and I think they used girder to map the function to volume
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  4. #4
    Variable Bitrate drait's Avatar
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    http://www.mp3car.com/vbulletin/sear...earchid=751821

    There have been a number of posts concerning the use of Phidgets and rotary encoders as volume knobs (and other functions as well). One of the easiest way to obtain a volume knob is with an older scroll wheel mouse that still uses a mechanical (rotary) encoder for the scroll wheel. You remove the one on the PCB and replace it with a higher quality one like the ALPS and use Girder to capture the MWHEELUP and MWHEELDN events. Send those to the system volume and you've got volume control (Girder even has a nice OSD for vol control). You can also capture the mouse click from button 3 (or whichever it is on your mouse) and use it to mute or pause.

  5. #5
    ddn
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    Variable Bitrate
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    3 Easy Steps:

    1. Buy Phidgets rotary encoder.
    2. Find and glue knob on.
    3. Install in dash.

    What is so hard? It says right on the site:
    Rotary Encoder. With dedicated USB cable for small form factor applications.

    Our encoder is a prepackaged solution needing no other hardware to run. Simply plug into the USB port and go!

    16 clicks for the full rotation.
    Doesn't get any easier than that.

  6. #6
    Variable Bitrate rubicon's Avatar
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    FWIW, I got an optical encoder from Digikey; planning to hook it up to the parallel port of my M10k (since its not doing anything anyhow).

    If anyone's interested, I can post pics/schematics/code when I'm done.

  7. #7
    Nic
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    yes please schematics pics and code would be awesome
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  8. #8
    Variable Bitrate rubicon's Avatar
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    Quote Originally Posted by Nic
    yes please schematics pics and code would be awesome
    Ok, as soon as I get all the parts and get it (nominally) working, I'll post some info. Should be sometime next week, unless I get the parts in time for the weekend.

  9. #9
    Variable Bitrate rubicon's Avatar
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    Alright, so I couldn't wait.

    Parts list:

    1x Grayhill 61C11-01-08-02 (32-position optical encoder w/switch)
    1x Spiffy aluminum knob for the encoder
    3x 10kOhm resistors (pull-up; one for each output + switch)
    1x PC Parallel port + mating d-sub plug
    various connectors, pieces of a CAT-5 cable, solder + burned fingers, etc.

    So, I'm using a variant of the circuit shown on the 2nd page of this PDF document.

    For +5V, I'll be using a GPO off of my (soon to be had) Matrix Orbital VK204-25 display, since it'll be right next to the encoder.

    For the data acquisition, I'll be writing a small C program to (for now) poll the parallel port. Since the encoder almost always has at least one of its outputs high, I don't think an interrupt-driven scheme will work here - would *constant* interrupt servicing be any better than polling?

    FYI, most of the daemons I'll be writing for this project will be in perl, with C for the speed-critical stuff.

    Circuit diagram + more info to come.

  10. #10
    Variable Bitrate Frigor's Avatar
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    Quote Originally Posted by drait
    One of the easiest way to obtain a volume knob is with an older scroll wheel mouse that still uses a mechanical (rotary) encoder for the scroll wheel.
    Where can I find a mouse like this? I knew that all the mouse wheels were optical...
    BMW E36 Project [ =======§== ]
    Hardware:
    Lilliput 7" Touchscreen - Epia M-10000 - HQCT 1.0 FM Radio - 2.5" 80Gb - USB GPS
    Software:
    FrodoPlayer 1.10 & MapMonkey with FriBruMet Skins by Frigor.

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