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???
03/10/08 08:14
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 		 #152057 - Many, many reasons!
Responding to: ???'s previous message
Jprao said:
While reading ADC, there is a significant flucuation in the reading. What may be the reason?

With no details of either your software or your hardware, we can only guess; but some possible guesses are:

  • The input signal is actually fluctuating. If you're just measuring it with a meter, that will be showing an average - it cannot respond to rapid fluctuations.
    You need to check it with an oscilloscope.

  • Your analogue input circuitry is noisy, and is causing the fluctuatioins.
    Again, you need to check with an oscilloscope at the ADC's inupt pin

  • Your I2C is faulty, and is corrupting readings.

  • Some other fault in your software is corrupting (or misinterpreting) the readings.

  • etc, etc,...

    Possibly a combination...

    • List of 5 messages in thread
    TopicAuthorDate
    Problem with 89C668 I2C ADC reading            01/01/70 00:00      
       Many possible reasons, but ...            01/01/70 00:00      
       Many, many reasons!            01/01/70 00:00      
          did you read            01/01/70 00:00      
             Thanks Eric            01/01/70 00:00      

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