https://www.baldengineer.com/tag/pushbuttonRecent content in pushbutton on Bald EngineerHugoen-USSat, 16 Dec 2017 01:18:22 +0000https://www.baldengineer.com/arduino-keyboard-matrix-tutorial.htmlFri, 15 Dec 2017 14:00:26 +0000https://www.baldengineer.com/?p=6830As a kid, I got the book " Upgrading and Repairing PCs." (Now in its 22nd edition.) It was the first book to explain to me the PC architecture. I considered, how were there so few pins on an AT-style keyboard connector when there were 101 keys on the keyboard? That is when I first learned about the keyboard matrix. Intel_P8049_AH_controller The keyboard matrix itself did not amaze me, but instead the idea there was an entirely separate 8-bit microcontroller inside of the keyboard. Early keyboards may have used the P8049AH, which, there is still some stock available to purchase. I was fascinated with the idea an entire computer was necessary to run the keyboard, to use my “real” computer. Why did it take something as complicated as a microcontroller?