[sdiy] usb keyboard matrix hack

[Scott Gravenhorst]

I think what you want is either a 4016 or a 4066.  It's a "floating" CMOS
switch, current can pass through it in either direction and it's controlled
by a single logic level input line.  Get the datasheet for full details, the
logic level input requires logic levels at or near Vss or Vdd for "open" and
"close".  A pulse (false-true-false) on the switch control logic input will
momentarily close and then open the switch.

Dave Krooshof <synthos at xs4all.nl> wrote:
>Hellew
>
>I'm trying to merge a USB numeric keyboard with a oldkool joystick
>(with 4 switches). The goal is that the joystick is electronically pressing
>the numbers on the keypad.
>The phisical keys of the keypad are allready in the trash.
>I made a logic circuit to convert the 9 positions of the joystick to
>pulses on 9 different wires.
>
>So I wondered... Just to keep things simple...
>Is there a logic gate that behaves like relais, so I can fake the keys?
>
>Something that behaves like this:
>I put 5 volts on pin 1, and pin 2 gets connected to pin 3.
>or:
>I put 5 volts on pin 1, and the voltage on pin 2 is copied to pin 3.
>
>Does it exist?
>
>
>-- 
>--
>
>groets,
>
>_          >^v<        _
>
>website http://www.dendriet.nl
>

---------------------------------------------------------
- Where merit is not rewarded, excellence fades.
- Hydrogen is pointless without solar.
- What good are laws that only lawyers understand?
- The media's credibility should always be questioned.
- The only good terrorist is a dead terrorist.
- Governments do nothing well, save collect taxes.

-- Scott Gravenhorst | LegoManiac / Lego Trains / RIS 1.5
-- Linux Rex         | RedWebMail by RedStarWare
-- FatMan: home1.gte.net/res0658s/FatMan/
-- NonFatMan: home1.gte.net/res0658s/electronics/
-- Autodidactic Master of Arcane and Hidden Knowledge.