[ask]there is any idea from the old keyboard PCB

Discussion in 'Embedded Systems and Microcontrollers' started by genesiscircuits, Jul 1, 2009.

  1. genesiscircuits

    Thread Starter New Member

    Jul 1, 2009
    sry i'm newbie here.

    i have a lot of old keyboard in my home.
    keyboard PCB has microcontroller inside right?
    there is any idea to change old keyboard PCB to some kind of microcontroller device?

    just my idea:
    -computer software can turn off/on numlock led
    -change the led to some relay circuit
    -connect that relay to other device
    -so i can turn on/off TV or other stuff from my computer (old keyboard use PS/2 port, my keyboard use USB port)

    is my idea can do that?

    any comment?

    (sry if my english bad)
    Last edited: Jul 1, 2009
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    The keyboard will have an encoder IC inside. I did not find a clear explanation of how one works, but it looks for a pressed key and from that input makes a code to send to the computer that stands for that key, plus a signal to tell the computer that a keypress has been detected.

    Here is a link to a company that makes keyboard encoders, so you can see some of the functions - http://www.hagstromelectronics.com/products/modules.html
  3. russ_hensel

    AAC Fanatic!

    Jan 11, 2009
    I have a lot, not clear what to do with them. Make refrigerator magnets, scrabble sets, name tags from the keys? I use the cords for project power cords. see:


    Other parts are highly specific to a keyboard, very small, never have been able to figure out what they are good for. Would love ( good ) ideas.
  4. KL7AJ

    AAC Fanatic!

    Nov 4, 2008
    The most useful organ of a keyboard is the scanner/multiplexer. Any application where you'd need to poll a bunch of devices in rapid sequence, this would be good for.
  5. kammenos

    Active Member

    Aug 3, 2008