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05/25/03 01:40
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#46575 - 40 Character keypad
Hi members,

I have a requirement for a table top instrument in which the client would like to save different pump configurations ( for testing ) with a descriptive name and recall it as desired.

This has resulted in a alphanumeric keypad to be there. However space is at a premium and I propose to design it as part of the front facia of the instrument - about 400x125mm available totally.

So the keypad will have 0-9,A-Z,INC,DEC,ENT,and SHFT keys - in all 40.

In the matrix mode I think I will need a minimum of 14 port pins for scanning. The question is : Is there any other means of handling this more elegantly ? Open to ideas with dedicated chips also as the project is in design stage.

Thanks a lot.

Raghu

List of 26 messages in thread
TopicAuthorDate
40 Character keypad            01/01/70 00:00      
   RE: 40 Character keypad            01/01/70 00:00      
      RE: 40 Character keypad            01/01/70 00:00      
         RE: PC keypad is the way to go!            01/01/70 00:00      
         RE: 40 Character keypad            01/01/70 00:00      
   RE: 40 Character keypad            01/01/70 00:00      
   RE: 40 Character keypad            01/01/70 00:00      
      RE: 40 Character keypad            01/01/70 00:00      
         RE: 40 Character keypad            01/01/70 00:00      
         RE: 40 Character keypad            01/01/70 00:00      
   RE: 40 Character keypad            01/01/70 00:00      
   RE: 40 Character keypad            01/01/70 00:00      
      RE: 40 Character keypad            01/01/70 00:00      
   RE: 40 Character keypad            01/01/70 00:00      
      RE: 40 Character keypad            01/01/70 00:00      
         RE: 40 Character keypad            01/01/70 00:00      
            RE: 40 Character keypad            01/01/70 00:00      
               RE: 40 Character keypad            01/01/70 00:00      
                  RE: 40 Character keypad            01/01/70 00:00      
   RE: 40 Character keypad            01/01/70 00:00      
      RE: 40 Character keypad            01/01/70 00:00      
         RE: 40 Character keypad            01/01/70 00:00      
   RE: 40 Character keypad            01/01/70 00:00      
      RE: 40 Character keypad            01/01/70 00:00      
         RE: 40 Character keypad            01/01/70 00:00      
            RE: 40 Character keypad            01/01/70 00:00      

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