Email: Password: Remember Me | Create Account (Free)

Back to Subject List

Old thread has been locked -- no new posts accepted in this thread
???
06/23/05 05:16
Read: times


 		 #95670 - Voltage Divder of 10k
Responding to: ???'s previous message
Michael, you are right. Its 10k and 10k = 2.5V at the Board B P0.7.

This looks bad, LOL. This common wire is supposed to be used by BoardA, and BoardB to detect each other presence.

Looks like I have to use 2 more, P0.4, P0.6.

I intend to do it this way.

Board A, P0.5 (1k pull up) to Board B P0.7 (10k pull up)
Board A, P0.4 (10k pull up) to Board B P0.6 (1k pull up)

When Board A VCC is disconnected, Board B 0.7 will read 0.

When Board B VCC is disconnected, Board A 0.4 will read 0.

Both boards will be having a common ground, their grounds will be connected to each other always.

Does this looks promising?



List of 49 messages in thread
TopicAuthorDate
Invalid input voltage?            01/01/70 00:00      
   read the specs            01/01/70 00:00      
      Re:read the specs            01/01/70 00:00      
         Noise margins            01/01/70 00:00      
            Re:Noise margins            01/01/70 00:00      
            MAKE the signal determinate            01/01/70 00:00      
   0 or 1            01/01/70 00:00      
      Fuzzy logic...?!            01/01/70 00:00      
         zone between VIL and VIH            01/01/70 00:00      
         zone between VIL and VIH            01/01/70 00:00      
            The 'grey' zone            01/01/70 00:00      
               Illogical signals help us to having...            01/01/70 00:00      
                  Well, I'm lost!            01/01/70 00:00      
                     Re:Well, I'm lost!            01/01/70 00:00      
                        Scopes            01/01/70 00:00      
                           Re:Scopes            01/01/70 00:00      
                     7 or 9 value logic            01/01/70 00:00      
                  I understand what Mehdi is saying.....            01/01/70 00:00      
                     Ah            01/01/70 00:00      
                     excellent, Michael            01/01/70 00:00      
                        triad            01/01/70 00:00      
                     wow, Mike            01/01/70 00:00      
                     There's the rub            01/01/70 00:00      
                     Detect What?            01/01/70 00:00      
                     Absolutely but!            01/01/70 00:00      
                        a question based on a guess            01/01/70 00:00      
               Not debounce. Hysteresis/schmitt            01/01/70 00:00      
                  Re:Not debounce. Hysteresis/schmitt            01/01/70 00:00      
                     Well, then ADC.            01/01/70 00:00      
         It Could be            01/01/70 00:00      
            "undefined operation"            01/01/70 00:00      
               Undefined            01/01/70 00:00      
                  Exactly            01/01/70 00:00      
   Thanks...            01/01/70 00:00      
      based on the above            01/01/70 00:00      
         Erik:Based on mehdi's emphasis            01/01/70 00:00      
            Thanks            01/01/70 00:00      
            Wow.            01/01/70 00:00      
               I describe it!            01/01/70 00:00      
                  Service            01/01/70 00:00      
                  I will never            01/01/70 00:00      
                     I will always            01/01/70 00:00      
            the missing if            01/01/70 00:00      
   Port 0 output when no power            01/01/70 00:00      
      Port 0 to Port 0.            01/01/70 00:00      
         Voltage Divder of 10k            01/01/70 00:00      
            nope            01/01/70 00:00      
               2 line solution            01/01/70 00:00      
                  I do somethimes my thumbs have another o            01/01/70 00:00      

Back to Subject List