Programming Forums > Application Development > Assembly

brkstf · Mar 15th, 2005, 3:09 PM

I'm working on a keyboard reader project for the PIC platform. I'll be using an AT/PS2 style keyboard to give instructions to some sort of robot.

Anyway, I did a lot of searching to find pin-outs and such, and found what i thought was decent info. Here's my problem:

Even though I have hooked up 5 volts supply voltage and ground, I'm not getting any signal at all from the keyboard. Shouldn't I be able to at least get a blip on my o-scope from the clock out and data out when i press a character, or am i missing something?

tempest · Mar 15th, 2005, 9:33 PM

Maybe you should ask on a computer engineering forum? You might get a better response there, i'm willing to put money on it that there aren't many people here who can help you.

Madman · Mar 16th, 2005, 12:26 AM

Simply do a search on google for Keyboard Interfacing. You'll find everything you need
there

brkstf · Mar 16th, 2005, 12:25 PM

i thought some snazzy assembly nerds would be up to the challenge. but thanks anyway. i'll keep at it.

lostcauz · Mar 16th, 2005, 2:53 PM

After checking around I believe you may have an incorrect pinout. I went to 3 different sites and got 3 different pinouts for the AT/PS2.

brkstf · Mar 16th, 2005, 3:42 PM

this page is really nice for anyone who needs a pinout.

http://www.networktechinc.com/technote.html

and thanks for the heads-up, lostcauz.

Madman · Mar 17th, 2005, 3:42 AM

Arent you using something similar to the intel 8042 keyboard controller to read
your keys?

You're not describing a assembly problem but more of a electronics problem.

I can help you when you know your hardware is working

brkstf · Mar 21st, 2005, 3:48 PM

nah, i'm not using an 8042. i just wanted to make an input device which will allow me to use an old keyboard to program and control a bot. i'm using a pic16f629 to control serial input.

i think i might be better off posting my question to the piclist, but i thought i'd try here, just in case. for me, the coding is always the easy part. the circuitry is always the problem.

Mar 15th, 2005, 3:09 PM	#1
brkstf Programmer Join Date: Feb 2005 Posts: 89 Rep Power: 4	Interfacing with a Keyboard I'm working on a keyboard reader project for the PIC platform. I'll be using an AT/PS2 style keyboard to give instructions to some sort of robot. Anyway, I did a lot of searching to find pin-outs and such, and found what i thought was decent info. Here's my problem: Even though I have hooked up 5 volts supply voltage and ground, I'm not getting any signal at all from the keyboard. Shouldn't I be able to at least get a blip on my o-scope from the clock out and data out when i press a character, or am i missing something?

Mar 15th, 2005, 9:33 PM	#2
tempest Programming Guru Join Date: Oct 2004 Posts: 1,041 Rep Power: 5	Maybe you should ask on a computer engineering forum? You might get a better response there, i'm willing to put money on it that there aren't many people here who can help you. __________________

Mar 16th, 2005, 12:26 AM	#3
Madman Newbie Join Date: Mar 2005 Posts: 4 Rep Power: 0	Simply do a search on google for Keyboard Interfacing. You'll find everything you need there Last edited by Madman; Mar 16th, 2005 at 12:27 AM. Reason: Spelling

Mar 16th, 2005, 2:53 PM	#5
lostcauz Hobbyist Programmer Join Date: Nov 2004 Location: 1691 miles East of L.A. Posts: 159 Rep Power: 4	After checking around I believe you may have an incorrect pinout. I went to 3 different sites and got 3 different pinouts for the AT/PS2. __________________ -- lostcauz Stepped in what?... Behind whose barn?... I didn't even know they had a cow!

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Mar 16th, 2005, 12:25 PM	#4
brkstf Programmer Join Date: Feb 2005 Posts: 89 Rep Power: 4	i thought some snazzy assembly nerds would be up to the challenge. but thanks anyway. i'll keep at it.

Mar 16th, 2005, 3:42 PM	#6
brkstf Programmer Join Date: Feb 2005 Posts: 89 Rep Power: 4	this page is really nice for anyone who needs a pinout. http://www.networktechinc.com/technote.html and thanks for the heads-up, lostcauz.

Mar 17th, 2005, 3:42 AM	#7
Madman Newbie Join Date: Mar 2005 Posts: 4 Rep Power: 0	Arent you using something similar to the intel 8042 keyboard controller to read your keys? You're not describing a assembly problem but more of a electronics problem. I can help you when you know your hardware is working

Mar 21st, 2005, 3:48 PM	#8
brkstf Programmer Join Date: Feb 2005 Posts: 89 Rep Power: 4	nah, i'm not using an 8042. i just wanted to make an input device which will allow me to use an old keyboard to program and control a bot. i'm using a pic16f629 to control serial input. i think i might be better off posting my question to the piclist, but i thought i'd try here, just in case. for me, the coding is always the easy part. the circuitry is always the problem.

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Programming Forums > Application Development > Assembly

Interfacing with a Keyboard