Diode help... HELP!

From: Bill Sudbrink <bill_at_chipware.com>
Date: Tue Feb 22 18:15:27 2000

> Chuck McManis gave me a circuit diagram...

Hmmm... Here's what I was trying:

[*] for connection

[D] for diode like this: -*->|-*
                               |


Binary

   1-------*----|----D----|----D----|----D
           | | | | | | |
           | | | | | | |
   2-------|----*----D----|----|----D----D
           | | | | | | |
           | | | | | | |
   3-------|----|----|----*----D----D----D
           | | | | | | |
           | | | | | | |
           | | | | | | |
           \ \ \ \ \ \ \
           *----*----*----*----*----*----*----GND
Switch: 1 2 3 4 5 6 7

Or, to put it in flat english:

switch 1 to binary pin 1, direct connect

switch 2 to binary pin 2, direct connect

switch 3 to binary pin 1 through diode
switch 3 to binary pin 2 through diode

switch 4 to binary pin 3, direct connect

switch 5 to binary pin 1 through diode
switch 5 to binary pin 3 through diode

switch 6 to binary pin 2 through diode
switch 6 to binary pin 3 through diode

switch 7 to binary pin 1 through diode
switch 7 to binary pin 2 through diode
switch 7 to binary pin 3 through diode

This should let me detect any one switch closed or
all switches open. What I get is the ability to
detect switches 1, 2 and 4 and no others... which
leads me to the conclusion that the diodes are a problem.
Received on Tue Feb 22 2000 - 18:15:27 GMT