Hi I have been studying the datasheet of the MM74C922N [https://www.soemtron.org/downloads/disposals/74c922.pdf] , a 4x4 matrix keypad, but I cannot seem to understand how it works under the 'Theory of Operation'. I know it outputs a 4bit binary code depending on the key pressed but other than that, I don't know how it actually works internally. Can anyone explain it in simpler terms? Thanks |
by LilBoy23
November 14, 2021 |
I've been playing with a 4x4 keypad and reading it with an Arduino UNO or NANO. I got it working nicely (and simply) with the Arduino "keypad" library so if you wish I can give you information on that. |
by Foxx
November 14, 2021 |
No answers yet. Contribute your answer below!
You must log in or create an account (free!) to answer a question.
Anyone can ask a question.
Did you already search (see above) to see if a similar question has already been answered? If you can't find the answer, you may ask a question.
CircuitLab's Q&A site is a FREE questions and answers forum for electronics and electrical engineering students, hobbyists, and professionals.
We encourage you to use our built-in schematic & simulation software to add more detail to your questions and answers.
Acceptable Questions:
Unacceptable Questions:
Please respect that there are both seasoned experts and total newbies here: please be nice, be constructive, and be specific!
CircuitLab is an in-browser schematic capture and circuit simulation software tool to help you rapidly design and analyze analog and digital electronics systems.