[sdiy] usb keyboard matrix hack

[Tim Parkhurst]

> -----Original Message-----
> From: Dave Krooshof [mailto:synthos at xs4all.nl]
> Sent: Tuesday, August 10, 2004 5:21 PM
> To: synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] usb keyboard matrix hack
> 
> The 4016 was what I was looking for, but conveiniently enough, I found out
> that the USB keyboard chip is happy with a NAND in stead of a switch as
well.
> Good! Got tons of those, so I can spend the night soldering.
> 
> But problems are only solved one at the time....
> Next issue is: The NANDs I have (I have a lot, I tried different types)
> want to have a real zero on the input and assume a 1 if the pin is
> not connected.
> The switches in my joystick are just simple (but VERY rugged) on/off
switches.
> 
> How would you suggest throwing the voltage to 0 when the switch is off?
> 
> 

A 10k resistor to ground (known as a pull down resistor).



Tim (pulled down) Servo

"Imagination is more important than knowledge." - Albert Einstein




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