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  • Author Author: phoenixcomm
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How to add old ps/2 keyboard interface to an Arduino

phoenixcomm

imageHow many PS/2 keyboards do you have? More than one, I'd bet. Well, stop trying to hang them on your tree, and use them not the whole thing just the encoder. BTW that's the little black thing on the rear. 

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1----DATA
3----GROUND
4----+5 V DC at 275 ma
5----CLLK

Of the six pins, we will only use four (4) of them. So what do we need? This will use an Arduino. and get this library.
Reference > Libraries > Ps2keyboard
This library is compatible with all architectures and boards.

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Lib Code My Code

PS2Keyboard keyboard;
void setup() { delay(1000); keyboard.begin(DataPin, IRQpin);
Serial.begin(9600);
Serial.println("Keyboard Test:"); }
void loop() { if (keyboard.available()) { // read the next key char c = keyboard.read(); // check for some of the special keys
if (c == PS2_ENTER) { Serial.println(); }
else if (c == PS2_TAB) { Serial.print("[Tab]"); } else if (c == PS2_ESC) { Serial.print("[ESC]"); }
else if (c == PS2_PAGEDOWN) { Serial.print("[PgDn]"); }
else if (c == PS2_PAGEUP) { Serial.print("[PgUp]"); }
else if (c == PS2_LEFTARROW) { Serial.print("[Left]"); }
else if (c == PS2_RIGHTARROW) { Serial.print("[Right]"); }
else if (c == PS2_UPARROW) { Serial.print("[Up]"); }
else if (c == PS2_DOWNARROW) { Serial.print("[Down]"); }
else if (c == PS2_DELETE) { Serial.print("[Del]"); }
else { // otherwise, just print all normal characters Serial.print(c); } } }

#include const int DataPin = 8;
const int IRQpin = 5;

void setup() { delay(1000); keyboard.begin(DataPin, IRQpin);
Serial.begin(9600);
 }

keyboard()check for some of the special keys
switch (keycode)

case ENTER:{ doLine();}  // Send line to the processor.
break;
case CAPS: // USE AS ALPHA
default:{ // Keys that are not defined
}break;
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