Microcontroller a d converter

He has 8 years of experience in Customer Support, Operations and Administration. Hi joydeep Thank you so much for your feedback. For more details please contact to Mr. Thanks for spending time to explain ADC to my understanding, but all the tutorial that i have read always rad use voltage supply as voltage reference, please i want explanation on how to use external voltage reference, if possible with circuit diagram.

Your email address will not be published. PIC Microcontroller. ADC Conversion. Comments sir i have a problem with piezoelectric signal recognition interfacing program with pic16fa microcontroller.

Leave a Reply Cancel reply Your email address will not be published. I thought that 10 bit resolution was quite high and there for the numbers should be constant. For example, I would expect to get a fixed reading of 90 in a row, or a variation of at most 1 in the value, between 89 to I'm using the following formula to convert the reading back to the voltage, but I don't think it is correct for calculating the voltage from ADC reading.

NBITS is 10, so the denominator is That's assuming Vref - is 0V. If the reference is 3. I suggest you carefully read the reference manual chapter on the bit ADC as linked here. The data sheet is generally sketchy in the operation of many things.

The ADC numbers you are giving don't make sense - it is a 10 bit ADC - why should a converted number be greater than ? You say that with 1V you get OR Well, neither are valid numbers and it sounds like 1V gives either OR and no value in between. One thing that can cause a bit PIC ADC to return results above is if the conversion is set for a left-justified result.

To see if that's the case you could try something like the following code that I used in something recently:. Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. Asked 7 years, 10 months ago.

Active 7 years, 10 months ago. Viewed times. Is it possible it is already converting to volts? Should I post my code? For example:. In this example, the analog voltage values from 0v to 0. We can say that the resolution of this component is very high. The analog input voltage of 3. Using similar way we can find a binary representation for any desired level of the analog input voltage.

The size of this register is one byte 8 bits. Each bit has an important role in the definition of the component. Here's a breakdown of the bits role:.