Kinetis Microcontrollers中的主题 Re: KL25z + 4x4 matrix keypad

KL25z + 4x4 matrix keypad

xabiergarciarui — Wed, 27 Mar 2013 16:49:55 GMT

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

erikmalund — Sat, 30 Mar 2013 16:24:17 GMT

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

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

mjbcswitzerland — Sat, 30 Mar 2013 20:16:36 GMT

Regards

Mark

Monica — Tue, 09 Apr 2013 21:15:21 GMT

Hello Xabier!

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

Best regards,

Monica.

xabiergarciarui — Thu, 11 Apr 2013 20:24:23 GMT

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

Best regards,

Xabier.