Matrix keyboard problem

[mister_e]

Set PORTB to input, place all 8 wires of the PORTB in parrallel with the actual design, and read all 16 keys results to PORTB, write your results to internal EEPROM, LCD or else. That's the only thing i can see. BUT i'm really not 100% sure that the reading of the keys will always be the same... worth to try.

Something like

TRISB=255
a var byte

start:
     a=PORTB
     LCDOUT $FE,1,"PORTB= ",HEX2 a
     pause 200
     goto start

[MegaADY]

Hmmm.... Interesting ideea. It might work . I'll test this in two days and I'll post reply here. But I feel like something is missing me . Not sure what exactly , but ... if the main system scans lines, and at the time t0 it scans line 3 and I am shorting line 1 column 1 , the result will be different than if the system scans other line and I am shorting line 1 column 1. right ? Not sure but ... I'll try this. Thank you very much.

[mister_e]

My assumption was good. it's working fine. i just finish to test it. Have fun.

[MegaADY]

Thank you very much ... it works fine !

[mister_e]

hi MegaADY,

nice to know it's working for you!