4x3 keypad

[docwisdom]

Thanks very much steve.
I have it running and the keys are being read. I tried using low value resistors on the columns but it didnt work, but low value resistors on the rows and it started reading.

One problem though, The first two rows are working perfect, but the second two rows will change values every time I press the button.
these columns.

The two affected rows are connected to the VREF pins on PORTA, is there a disable config for VREF? or is it default disabled?



one more question also while your peeking at this thread. is there a way to make the auto repeat work only on 2 buttons? Two buttons on my kepad are +- adjustments and all the others are command buttons. It would be great to make the +- buttons autorepeat.

[mister_e]

Did you modify your code and include those lines at the top?

ADCON1=$0F    ' Disable AD converters
CMCON =7      ' Disable analog comparator

Comparator voltage reference is suppose to be set to off by default if you refer to the CVRCON POR. AND when you set ADCON1 to 0F, you set VREF- to Vss, VREF+ to VDD... so i can't understand why it doesn't work.

one more question also while your peeking at this thread. is there a way to make the auto repeat work only on 2 buttons? Two buttons on my kepad are +- adjustments and all the others are command buttons. It would be great to make the +- buttons autorepeat

The first thing spring to mind is to set the AUTOREPEAT to ON then read the MyVar value and if it's not one of your two keys... redo the keypad scan until it change.

PS: you're right, i did a mistake, low value resistor must be on ROWs, not colums... DOH!

[docwisdom]

we have operation. thanks very much steve.

it was the ADCON1 register. Do you have any resources to better explain registers and their settings. when I read about them in datasheets is all just a totally different language to me.


I have yet to implement the autorepeat. Ill post again with its results

[docwisdom]

I got my desired repeat with a simple loop comand.

thanks for all your help steve, its been invaluable.

If you feel so inclined, would you mind looking over my code and schematic to check for any changes that could be made for efficiency and design?

thanks
-brian

[mister_e]

You're welcome! Great to know it's working fine now.

No problem, post your stuff here. i'll post my own comments, i hope other will also do it too.

Do you have any resources to better explain registers and their settings. when I read about them in datasheets is all just a totally different language to me.

Sorry, i don't see any other reference. Sure sometimes datasheet are just Chinese to me (or greek depending of your local expression) but by using the trying/debuging/understanding method you'll never find any better reference. The first time is always the hardest... once you hit the wall and bang your head on your keyboard few times, you can't forget it. This is probably why i choosed this picture for my avatar <img src="http://www.picbasic.co.uk/forum/member.php?u=580">