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Thread: DIY USB Volume Controll Knob - How? Help?

  1. #1
    Variable Bitrate we87's Avatar
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    DIY USB Volume Controll Knob - How? Help?

    I have searched both here and google and I still havent found what I'm looking for... All I have seen is pages on how to hack up a mouse with a scroll wheel, but I dont want to use a mouse since I already have two pointer devices on my setup (Touchscreen plus Wireless USB Keyboard/Mouse) and I'm afraid to add another mouse as I feel it will confuse things....

    All I want to do is build a Volume Knob that hooks up via USB to control the volume in my frontend, which is in my case MobileImpact (built ontop of Windows Media Player). Plus I want to be able to push the volume knob in for Mute. So it would have to be a volume side to side, then button for mute.

    I would think it would be fairly easy to get a potentiometer and the right software and get this done, but I havent actually found this anywhere. I have found a way to use a potentiometer to control the volume between the PC and the AMP by cutting the audio cable inbetween both and using a potentiometer there, but I dont want to do that. I want to control the volume digitally in Windows, not physically between my AMP and PC.

    Something like the Phidget's USB knob would be great, but in a DIY fashion...

    Sorry for being so picky. But I figured before I do something that I dont want, I should ask if what I do want is out there first

    Thanks in advance for any help.
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    Raw Wave Rob Withey's Avatar
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    Quote Originally Posted by we87 View Post
    Something like the Phidget's USB knob would be great
    You answered your own question. If you think that you can just hook a potentiometer to a USB port and write some software, you are sadly mistaken. You need a circuit in between that handles A-D conversion, and the USB protocol.
    Make it easy on yourself, get a Phidget.

    If you really insist on going this route, get a USB/serial board and hook it up to a PIC to manage the A-D.

    USB/serial board : http://cgi.ebay.co.uk/USB-Serial-int...QQcmdZViewItem
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    Get an analogue joystick on USB.

    You get 2 pots + 2 switches.

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    Fusion Brain Creator 2k1Toaster's Avatar
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    Another idea would be to take the POT in line with a A2D chip TTL/CMOS standard converter and ouput that to the parrallel or serial port and write your own crude program. Definately not the best way to go.

    And why not just use the phidget?
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    MGD
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    Get the griffin powermate. works perfect for that.

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    Variable Bitrate we87's Avatar
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    Thanks guys for all of the replies....

    I dont want to "buy" anything. I feel its a simple project that I can wrap my head around and build it myself. (its more fun that way ) So the Phidget and Griffin is out....

    The USB Serial board is an idea, only because I would like to play around with that and see what are the possibillities out of it.

    I'd rather not use the A2D chips inline with the parallel because I have no clue on how to code....


    The analog joystick is a good idea, but it would be the kinda knob I want it to be.

    -----

    Thanks alot guys, but I guess my one track mind has to open itself a little and just go with the mouse idea. I'll just have to rig it up somehow so I can still use the button off of it. Whatever I end up doing I'll post it in my thread. thanks again!
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    Quote Originally Posted by we87 View Post
    The analog joystick is a good idea, but it would be the kinda knob I want it to be
    Replace the joystick pots with a nice looking volume pot and knob. 3 wires to solder

    Cant remember the name of the software that allows you to map hardware device to control the volume control, Im sure some of the guys here know.

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    High Voltage blk02si's Avatar
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    Hacked wheel mouse + volumouse software works great for me even with my other input devices.
    Build Things, it keeps your brain busy.

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  9. #9
    Variable Bitrate
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    I got the USB phidget from phidets USA or something, and it came with the board and the knob, all you have to do is write the code in Java (my friend did it) and their website gives you some coding too...it worked fine, until my friend walked on it and it bent...

  10. #10
    FLAC strohj's Avatar
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    Quote Originally Posted by we87 View Post
    Thanks guys for all of the replies....

    I dont want to "buy" anything. I feel its a simple project that I can wrap my head around and build it myself. (its more fun that way ) So the Phidget and Griffin is out....

    The USB Serial board is an idea, only because I would like to play around with that and see what are the possibillities out of it.

    I'd rather not use the A2D chips inline with the parallel because I have no clue on how to code....


    The analog joystick is a good idea, but it would be the kinda knob I want it to be.

    -----

    Thanks alot guys, but I guess my one track mind has to open itself a little and just go with the mouse idea. I'll just have to rig it up somehow so I can still use the button off of it. Whatever I end up doing I'll post it in my thread. thanks again!

    if you cant code.. I suggest going with something already built etc... one more thing you have to a A-D conversion to use USB.. since it uses a digital signal and your pot.. is a analog signal...

    anyways.. let us know what you did and how!!
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