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Topic: PS/2 keyboard (Read 3 times) previous topic - next topic

James C4S

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I striped the wire, and used the wikipedia article
http://en.wikipedia.org/wiki/Ps2_connector
Since you cut the connector anyway, have you verified with your meter's continuity tester to verify the pinout / colors?  I wouldn't rely on the wikipedia article.

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And nothing shows up in the Serial Monitor.
Nothing?  Not even the "Keyboard Test" message you have in your setup()?  You might add a serial.println() after the if "(keyboard.available())."  Then you'll at least know your if-else-cases are being checked.

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According to my volt meter, the 5V is being delivered, but te CLK and DATA are dead.
Keep in mind that CLK and DATA are both open-collector outputs from the keyboard.  So without a pull-up resistor, you probably won't see them change.  (From what I can tell, the libraries enable the internal pull-ups, so you don't need to worry about this.)

Start by verifying you have the pin-out of your connector correct.  Like I said, don't rely on the Wikipedia's color code for the wires.
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Osgeld

#6
Sep 19, 2010, 10:31 pm Last Edit: Sep 19, 2010, 10:31 pm by Osgeld Reason: 1
heh last ps/2 keyboard I tore apart the wire colors were random AND the silkscreen was wrong

wire colors are a horrid way of figuring out connections anyway, they mean nothing and no one has ever stuck to whatever people seem to think they should be

baum

Question 1: I stripped the main, thick, black, cable ( that comes out of the keyboard itself), to find five more inside. 4 were colored (as I have mentioned), one was uninsulated. Wikipedia claimed that red was Vs, yellow was GND, green was clk, white was data. There was no mention of the uninsulated one. I tested these wires, using wikipedia's chart for reference. None seemed to be working.
2. Before I stripped the main cable, I plugged it in to a computer, and it worked. Then I stripped it.
3. I didn't confirm, I only reference the chart on wikipedia's PS/2 connector article (which I have posted the link somewhere)
4. At the beginning of the program, the Arduino outputs "Keyboard Test" to the Serial monitor. This came up, just nothing else did.

Just a side note....
The PS/2 plug has 6 pins--- but only 5 wires. The four I have told you are pins 1, 3, 4, 6, but no one seems to know what pins 2 and 6 do. So since I have 5 wires, one of them could be the wire for pin 2 or 6.
I don't know.

The problem can't be software-- this library has worked for others. So it must be hardware/wiring.

Also-- the problem is not only trying to get the data to the arduino-- it seems as though the keyboard isn't getting power. The caps, num, and scroll lock lights won't light up when pressed as they did when plugged into a computer.

baum

I looked at the plug, and I tried the following connections:
Yellow is CLK
Green is DATA
Red and White are power
I'm not sure what the uninsulated is, nothing happened when I connected it to ground or 5Vs.

baum

How do you suggest I figure out the wires?

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