Matrix Keypad routine

[Squibcakes]

Hi Steve,

What value do you use for the Pull Up resistors?

What value do you use for the series resistors?

Cheers
J

[mister_e]

Could be almost everything but usually i use 10K as pull-up, serie resistor could be remove but usualy 100-300 ohm is perfect.

[Srigopal007]

Hi Steve,

With the code that you have posted, Will this be able to recognize if the user presses more than one button at a time, or is it limited to only one button pushed at a time. If the later is true, then how can I implement a 4x4 matrix so that it allows multiple button pressed at one time .


Srig

[mister_e]

Hi Srig!

Long time we didn't heard from you

I do remember you asked that question awhile back but, sorry, only one button at the time for that one.

But as pushing two button exacty at the same time is an impossible human thing, we can modify the actual one and add some feature to. It will have to check once a button is press, wait few ms, set a flag, then RESCAN the whole keyboard and see if things changed. Not impossible.

I'll check what i can do with it somewhere next week. I have some project for some user here (those who pay for ) and i promise to deliver by the end of this weekend... Mister_E rule#1 : always respect delay even if i must stop to sleep, avoid beer and ladies.

Sure i'll have an eye on it next week. See ya!