Gert Jan Schoneveld / keypad

Fork without short circuits

Dependents:   SaveKeypad

Fork of keypad by HM Yoong

No extra hardware is needed besides the wires and switches. The columns are outputs configured with open drain. The rows are inputs configured with pull up resistors. A key press pulls down its row. With scanning the column is determined thereafter.

See SaveKeypad for an example usage.

Files at this revision

API Documentation at this revision

Revision 3:ecd4bb97a033, committed 2012-01-30

Comitter:
yoonghm
Date:
Mon Jan 30 09:56:15 2012 +0000
Parent:
2:2e4900821a28
Child:
4:b24cd656a23d
Commit message:
Documentation

Changed in this revision

keypad.h Show annotated file Show diff for this revision Revisions of this file 
--- a/keypad.h	Mon Jan 30 09:55:13 2012 +0000
+++ b/keypad.h	Mon Jan 30 09:56:15 2012 +0000
@@ -28,9 +28,7 @@
 
 /**
  * An interrupt-based interface to 4x4 keypad.
- *
  * You also need to import FPointer library by Andy Kirkham
- *
  * On each key pressed on a keypad, the index of the key is passed to a
  * user-defined function. User is free to define what to be done with the
  * input.