I am trying to use inbuilt ADC of PIC 18F4520.

The input is a voltage signal by an analog sensor whose output varies with temperature. It comes to be about 5.2 V at a certain temperature.

Now, I am getting fluctuating values of ADC output (I checked the ADC output by printing the result with 4 seven segment display unit). When the output seems to be 65 it fluctuates between 60-70. I am unable to understand the cause of this fluctuation. As I intend to measure temperature via the output of this analog sensor, the fluctuation in ADC output is causing trouble. What can be the reason and please provide its solution also.

Also, is there a way to know the output that 10 bit ADC will show for a particular input?

Image source: Microchip - PIC18F2420/2520/4420/4520 Data Sheet

I am also confused that if I had set the reference voltage bit VCFG0 to VDD i.e. 5 V. and VCFG1 to VSS i.e. 0 . So will my ADC be able to measure 5.2 or any voltage above 5 V ?

I am trying to use the built in ADC of a PIC 18F4520.

The input is a voltage signal from an analog sensor whose output varies with temperature. It comes to be about 5.2 V at a certain temperature.

I am getting fluctuating values from the ADC output (I checked the ADC output by printing the result with 4 seven segment display unit.) When the output seems to be 65 it fluctuates between 60-70. I am unable to understand the cause of this fluctuation.

As I intend to measure temperature via the output of this analog sensor, the fluctuating ADC output is causing trouble.

What can be the reason and a solution?

Is there a way to know the output that 10 bit ADC will show for a particular input?

Image source: Microchip - PIC18F2420/2520/4420/4520 Data Sheet

I am also confused that if I had set the reference voltage bit VCFG0 to VDD i.e. 5 V. and VCFG1 to VSS i.e. 0, will my ADC be able to measure 5.2 or any voltage above 5 V?

I am trying to use inbuilt ADC of PIC 18F4520.

The input is a voltage signal by an analog sensor whose output varies with temperature. It comes to be about 5.2 V at a certain temperature.

Now, I am getting fluctuating values of ADC output (I checked the ADC output by printing the result with 4 seven segment display unit). When the output is 60 it fluctuates between 60-70. I am unable to understand the cause of this fluctuation. As I intend to measure temperature via the output of this analog sensor, the fluctuation in ADC output is causing trouble. What can be the reason and please provide its solution also.

Also, is there a way to know the output that 10 bit ADC will show for a particular input?

Image source: Microchip - PIC18F2420/2520/4420/4520 Data Sheet

I am also confused that if I had set the reference voltage VFG0 to VDD i.e. 5 V. and VFG1 to VSS i.e. 0 . So will my ADC be able to measure 5.2 or any voltage above 5 V ?

I am trying to use inbuilt ADC of PIC 18F4520.

The input is a voltage signal by an analog sensor whose output varies with temperature. It comes to be about 5.2 V at a certain temperature.

Now, I am getting fluctuating values of ADC output (I checked the ADC output by printing the result with 4 seven segment display unit). When the output seems to be 65 it fluctuates between 60-70. I am unable to understand the cause of this fluctuation. As I intend to measure temperature via the output of this analog sensor, the fluctuation in ADC output is causing trouble. What can be the reason and please provide its solution also.

Also, is there a way to know the output that 10 bit ADC will show for a particular input?

Image source: Microchip - PIC18F2420/2520/4420/4520 Data Sheet

I am also confused that if I had set the reference voltage bit VCFG0 to VDD i.e. 5 V. and VCFG1 to VSS i.e. 0 . So will my ADC be able to measure 5.2 or any voltage above 5 V ?

I am trying to use in built ADC of PIC 18F4520. The input is a voltage signal by an analog sensor whose output varies with temperature. It comes to be about 5.2 V at a certain temperature. Now, i am getting fluctuating values of ADC output (I checked the ADC output by printing the result with 4 seven segment display unit). When the output is 60 it fluctuates between 60-70. I am unable to understand the cause of this fluctuation. As i intend to measure temperature via the output of this analog sensor the fluctuation in ADC output is causing trouble. What can be the reason and please provide it's solution also. Also, is there a way to know the output that 10 bit ADC will show for a particular input?  

I am also confused that if i had set the reference voltage VFG0 to VDD i.e. 5 V. and VFG1 to VSS i.e. 0 . So will my ADC be able to measure 5.2 or any voltage above 5 V ? Please answer, thanks in advance.

I am trying to use inbuilt ADC of PIC 18F4520.

The input is a voltage signal by an analog sensor whose output varies with temperature. It comes to be about 5.2 V at a certain temperature.

Now, I am getting fluctuating values of ADC output (I checked the ADC output by printing the result with 4 seven segment display unit). When the output is 60 it fluctuates between 60-70. I am unable to understand the cause of this fluctuation. As I intend to measure temperature via the output of this analog sensor, the fluctuation in ADC output is causing trouble. What can be the reason and please provide its solution also.

Also, is there a way to know the output that 10 bit ADC will show for a particular input? 

Image source: Microchip - PIC18F2420/2520/4420/4520 Data Sheet

I am also confused that if I had set the reference voltage VFG0 to VDD i.e. 5 V. and VFG1 to VSS i.e. 0 . So will my ADC be able to measure 5.2 or any voltage above 5 V ?