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???
01/31/07 18:48
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 		 #131826 - LCD's vary, and contrast voltage is NEGATIVE!
Responding to: ???'s previous message
I've only seen one example in the past 15 years, where a voltage more positive than -2 volts produced sufficient contrast. I often use a 20K pot to the -10 or so available from the MAX-232 or equivalent that's already present.

RE

List of 70 messages in thread
TopicAuthorDate
LCD Help needed            01/01/70 00:00      
   as replied in parallel thread            01/01/70 00:00      
   try this...            01/01/70 00:00      
      Not this bit            01/01/70 00:00      
         I do both software and hardware.            01/01/70 00:00      
            diffference            01/01/70 00:00      
   What assembler??            01/01/70 00:00      
   No Initializatoin            01/01/70 00:00      
      Wait There it is.            01/01/70 00:00      
   Ah lcd problems!            01/01/70 00:00      
   Hardware problem?            01/01/70 00:00      
      Well i think its the Hardware + Software problem            01/01/70 00:00      
         Half of display            01/01/70 00:00      
            8 bit initialization            01/01/70 00:00      
               This is New Program            01/01/70 00:00      
                  nothing new            01/01/70 00:00      
                     Well sir Erik there is my code commented            01/01/70 00:00      
                        sparsely and nit using <pre> and </pre>            01/01/70 00:00      
                           It's not that difficult            01/01/70 00:00      
                              Well its not being good            01/01/70 00:00      
                                 OK, down to brass tacks and babysteps            01/01/70 00:00      
            Right Sid of LCD is Fading            01/01/70 00:00      
         normal?            01/01/70 00:00      
      LCD's vary, and contrast voltage is NEGATIVE!            01/01/70 00:00      
         sometimes            01/01/70 00:00      
            I heard that once ...            01/01/70 00:00      
         HUH?            01/01/70 00:00      
            guilty as charged            01/01/70 00:00      
               two            01/01/70 00:00      
                  I reuse mine            01/01/70 00:00      
   try this one            01/01/70 00:00      
      why try something that can not be unbderstood            01/01/70 00:00      
   Solve            01/01/70 00:00      
      Nothing is happining with New LCD also            01/01/70 00:00      
         Sorry guys...            01/01/70 00:00      
         Try            01/01/70 00:00      
            Well sir I am using HD44780            01/01/70 00:00      
               sloooow down coders            01/01/70 00:00      
   TESTED code for LCD            01/01/70 00:00      
      It may be tested..            01/01/70 00:00      
         blame            01/01/70 00:00      
            Circuit configuration for LCD interfacing            01/01/70 00:00      
               P1.x control?            01/01/70 00:00      
                  No problem with pin configuration            01/01/70 00:00      
                     Well i have changed Pin configuration back            01/01/70 00:00      
                        Pullups on P1.0,1            01/01/70 00:00      
                           about P1.0 and P1.1            01/01/70 00:00      
                        Does your micro work at all?            01/01/70 00:00      
                           to be specific...            01/01/70 00:00      
                        my issue            01/01/70 00:00      
      debugging            01/01/70 00:00      
   Finally i have did it.....            01/01/70 00:00      
      go high            01/01/70 00:00      
   Code for 8-Bit LCD (HD44780)            01/01/70 00:00      
      perfect            01/01/70 00:00      
         Perfect for some...            01/01/70 00:00      
            it is important with the at89c2051            01/01/70 00:00      
               i am noob, so dont worry about pins :-)            01/01/70 00:00      
                  no encryption required            01/01/70 00:00      
               Real world            01/01/70 00:00      
                  answer            01/01/70 00:00      
                     Is this true?            01/01/70 00:00      
                        To some people it seems            01/01/70 00:00      
                           kindof            01/01/70 00:00      
                              You can get by with this some of the time            01/01/70 00:00      
                              Point missed            01/01/70 00:00      
                                 check this            01/01/70 00:00      
                                    You didn't take the challenge            01/01/70 00:00      
   why should you            01/01/70 00:00      
   Help on LCD code            01/01/70 00:00      

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