I have 5 4x4 matrix Keypads (Grayhills), and I have 5 74C922N IC's (Keypad Interfaces)
Now I am trying to use them but they want to use a few capacitors and other IC's in conjuction with the 922 Chip, What I would like is to only have the 922 chip, keypad, and PIC. If this is possible. I have not found good schematics for this, and am unsure what schematic would be best. I was hoping to use the Data Available pin to the INT (RB0) and tie the 4bit to (? PortC 0-3) I could use any pin as the data received. I can use the keypad.bas and tie the keypad strait to the PIC, but I would rather use these chips.
So what should I use a direct Keypad-PIC connection and software code keystrokes? or Use the 922 Chips with Supporting Chip & Capactors? or Other options someone here may provide.
My layout of code in my head right now appears like this.
on INT(RB0) set Variable X = PortC
send data received to 922 chip
continute program, program now uses variable X
PS, im only trying to use 1 keypad, I just noted that I have 5
Now I am trying to use them but they want to use a few capacitors and other IC's in conjuction with the 922 Chip, What I would like is to only have the 922 chip, keypad, and PIC. If this is possible. I have not found good schematics for this, and am unsure what schematic would be best. I was hoping to use the Data Available pin to the INT (RB0) and tie the 4bit to (? PortC 0-3) I could use any pin as the data received. I can use the keypad.bas and tie the keypad strait to the PIC, but I would rather use these chips.
So what should I use a direct Keypad-PIC connection and software code keystrokes? or Use the 922 Chips with Supporting Chip & Capactors? or Other options someone here may provide.
My layout of code in my head right now appears like this.
on INT(RB0) set Variable X = PortC
send data received to 922 chip
continute program, program now uses variable X
PS, im only trying to use 1 keypad, I just noted that I have 5