KL25z + 4x4 matrix keypad

[xabiergarciarui]

Could someone help me with a project KL25z microcontroller???

The problem I have is that I have no idea how to implement a 4x4 matrix keypad.

If anyone has a project that has implemented a keyboard in KL25z could share?

Thanks for your time

[Monica]

Hello Xabier!

Have these been helpful suggestions? Please let us know! :smileyhappy:

Best regards,

Monica.

[xabiergarciarui]

Yes sorry you are right, the information was very useful.

Best regards,

Xabier.

[mjbcswitzerland · Accepted solution]

Hi

There are some extra details her:http://www.utasker.com/docs/uTasker/uTaskerKeypad.PDF

Regards

Mark

[erikmalund]

The problem I have is that I have no idea how to implement a 4x4 matrix keypad.

If anyone has a project that has implemented a keyboard in KL25z could share?

I do not share projects, they are all proprietary, buy I can give you an "how to implement a 4x4 matrix keypad"

for debouncing purposes you do this in a timer ISR (10 ms. is usually good)

pull all columns high

a*

pull column 1 low, if any row low, you have your key

pull column 1 high

repeat from a* for columns 2 3 and 4

Erik

Erik