Hey arduinians, I was working on a keypad one day when i came up with my own math problem that I could not solve! Keypads are 0-9, I was trying to figure out the least number of digital pins needed using the on/off method rather than the resister/analog method. I call this method, the and-gate-me…

High Level Math Question!

dmxspider June 25, 2010, 8:40pm 3

It seems you are correct!

This might be useful for anyone trying to do something using the least amount of wires. (keypads..).

Topic		Replies	Views
Circuit question Frequently-Asked Questions	4	782	May 6, 2021
keypad with 14 pins Interfacing	6	4207	May 6, 2021
Best way to use less pins with a keypad General Electronics	12	2700	May 6, 2021
Figuring out an unknown keypad. Frequently-Asked Questions	7	1920	May 6, 2021
Matrix keypad Interfacing	3	1592	May 6, 2021