Connecting 3*3 keypad to pic18f4520

[KhaledOsmani]

Hi,

How can 1 Kohm resistor with each row of a keypad can protect from having corrupted numbers on the output (lcd) and do we take the input of rows to the pic directly after the resistor as a method of connection, or do we connect the resistors to ground and take input to pic in between the terminal of the resistor and the ground??

Can we apply 5,9V to such PIC? Harmless or damaging?

Thank you

 

[ud23]

9v or 5.9v both are damaging for your pic. and you can see many matrix keypad circuit in this forum and on the google.
https://www.edaboard.com/threads/247406/

 

[KhaledOsmani]

Hello,

The output of the 5V regulator is giving 5,9v not 5, even though i have branched 0.33 uf to the regulator input pin and 0.22 uf to the output the regulator.

 

[ud23]

try with 100uf at input and 10uf at output your regulator might damaged.What is your input voltage?Try with the new regulator.