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Posted in Misc Hacks, Peripherals Hacks Tagged keyboard, led, ps2 Post navigation Although turning on a light is fun, we could see this being used as an expedient method to control a relay for automation purposes. Although the article doesn’t fully address it, a very similar method can be used to send data back to the keyboard for such purposes as tuning on a “capslock” or “numlock” key. Most of these codes are 8-bit, but some special symbols use a longer code. A schematic of the whole project is given here as well as a detailed bill of materials.Īs for how the PS/2 keyboard works, each keystroke is encoded into a binary number or “scan code”. The system displayed below uses a PIC controller to display the letter or number pressed. The tutorial also includes quite a bit of theory behind it. How they work, however, is a bit more complicated than “one button, one input.” has a great tutorial about building a PS/2 keyboard interface with a 7-segment LED display (video after the break).

Anyone reading this post has undoubtedly used a keyboard.

Ps2 scan codes