Keyboard Hacking - A First Part II


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Posted by Malberg on 18, 2000 at 1:47 PM:

In Reply to: Re: Keyboard Hacking - A First posted by Jim K on 17, 2000 at 11:07 PM:

Thanks Jim K:

Your reply was quick and helpful.

I just want to clarify a few things, maybe I miss LED(No pun intented!! hehe) you on two of my three points, my wording was wrong!!! OOpps.

1)The multimeter has 2 ends one of which goes to one of the leads on the pcb board and where does the other one go? I know you mentioned the key, but where on the key? Are you talking about the mylar contact under the actual keyboard button?

2)If I start by using a wire to test 2 contacts on the pcb(1st method) or use the multimeter(2nd method) how will I know the dimension of matrix?
For example as I mentioned to you earlier that my pcb is 20 x 8, but your saying that this may not be the case. This is the way I see it I will put one end of the wire on the first lead of 20 and the other end on the first lead of 8, and then the second lead of 8 etc etc. Isn't this going to give me a 20 x 8 matrix? Please correct me if I'm wrong.

3)What I meant was that because the LEDs are not on the pcb, but on the keyboard itself, is something bad going to happen when I start connecting the leads to determine my matrix? I diffently do NOT want to fool around with LEDs.

Regards -

Malberg


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