Overview
- Object ID : 2735 (2013-06-17)
- Author : Clive Wakeham | added by Archiver
- Content : Code
- Microcontroller : P1
- Language : SPIN
- Category : Human Input
- Licence : Other
Content
Updated version of my 74C922 4x4 keypad chip driver and buffer.
This version works with the 74C922 and the 74C923.
This version has the following methods; start, stop, read last key, read the size of the buffer, clear the buffer, and search the buffer for a specific key value.
Added a feedback function to drive an LED or buzzer (via transistor etc).
Datasheet for the 74C922/74C923 is included.