Usb Foot switch

Discussion in 'The Projects Forum' started by Soundshark, Jul 20, 2009.

  1. Soundshark

    Thread Starter New Member

    Jul 19, 2009
    6
    0
    Hi

    I have posted another qustion regarding this project and another issue but this could solve the problem all together :)

    Iv built a proto type foot switch for starting stoping and skiping tracks in a media program when im singing on stage using an old keyboard controller. Now it works well but the computer sees it as a keyboard obviusly :) and all the comands the computer recives are recived as key storkes which can cause some issues with some programes ( hence the other post regarding driver editing)

    Now the other option i have is to build my own 3 button controller from scratch iv done some digging and as of yet found no details on how to do this everyone just sugests using existing game pads and existing units. Could someone please help me with building a unit from scratch

    Thanks anthony
     
  2. GetDeviceInfo

    Senior Member

    Jun 7, 2009
    1,571
    230
    If you reduce your old keyboard controller down to 3 keys, and that doesn't work, what then do you require as input from your device that would represent the 3 functions?
     
  3. bertus

    Administrator

    Apr 5, 2008
    15,645
    2,344
    Hello,

    Perhaps use a USB numeric keyboard as used for a laptop.

    Reduce the number of keys to your needs.

    Greetings,
    Bertus
     
  4. Soundshark

    Thread Starter New Member

    Jul 19, 2009
    6
    0
    yeah thats what i have done i have removed the contoller from the keyboard and soldered 3 push to makes switches to it creating 3 key strokes which i can then assighn functions in the software i use so it works great but if there is anything else open that uses thouse keys it will input 2,3 or a space depending on the function i use im currently trying to develop my own driver that will allow me to load the controler as a custome device but if that fails id like to build a whole controler from scratch mainly just so i can say i have and its my own device not just another companies guts lol in my case
     
  5. GetDeviceInfo

    Senior Member

    Jun 7, 2009
    1,571
    230
    you could use one of many controllers that have USB device capabilities, then emulate the USB's HID class (of which keyboards fall under), then do the same thing.

    All the USB device capable manufacturers that I am aware of offer software that will perform such functions.
     
  6. RiJoRI

    Well-Known Member

    Aug 15, 2007
    536
    26
    Yeah, a keyboard is kinda universal!
    I'd look at an Arduino board, or a Parallax Stamp. The code would be relatively simple:


    Loop
    ..Read Port
    ..Debounce Port
    ..Decode Port
    ..Send Info to Computer
    ..Wait for Key Release
    End Loop

    You can decide if you want to allow simultaneous key presses or not. You should also consider if you want repeating keys or nnnnot. The PC program will need to read the port (RS-232 or USB) and take action on what it receives.

    HTH,
    --Rich
     
  7. jj_alukkas

    Well-Known Member

    Jan 8, 2009
    751
    5
    Hey I have built an IR remote control reciever for PC on USB using a circuit I found over the net.. Its a cool and interesting project and I enjoyed a lot building it... It is based on the Atmel AT90S2313 microcontroller and with a bit modifications, you could easily turn it into a wired device utilizing USB for commands.. The commands are controlled by a software program called girder and the drivers for this device are also available on this site.. If you find this circuit complex, you could try using the RS232 version of the same project which only uses a TSOP 1738 for IR reception and a zenner and resistor.. You can mod it and wire it or for some hi tech, you could make your whole project wireless using IR.. The software can emulate exisiting keys, automate programs or generate any new command for any code recieved.. It was originally meant for a multimedia home theatre PC.. Give it a shot..

    www.cesko.host.sk
     
  8. Soundshark

    Thread Starter New Member

    Jul 19, 2009
    6
    0

    this is fantastic just help me develop my idea to the next stage :) a wireless setup i may be getting ahead of my self but hey no fun in doing things the easy way lol
     
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