74C92X Keypad Buffer and Driver

Warning message

The Propeller Object Exchange system is decommissioned and replaced with a GitHub repository to house the same existing and future Propeller objects. As of 12/5/2019, this site is read-only. You can continue to browse and download objects from here for a limited time; however, please begin using the Parallax Propeller repository for future reference.
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0
Request group membership
By: created: 2011-03-22 | updated: 2013-06-17

 

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.
 
Original File Upload
AttachmentSize
Package icon 74C92X_Object.zip350.88 KB