MikroC Pro, ADC and external voltage source

[Veketti]

Dear All,

I was wondering that how to read ADC correctly in MikroC Pro when external voltage reference is applied? In MikroC help it says that ADC_Read -function doesn't work if external voltage reference is used. One of my projects where I'm using LM35 temperature sensor I added MCP1525 precise 2.5V voltage reference to pic and used ADC_Read function. I got senseful readings. Now I'm wondering that is those readings somehow wrong or why does it say in help that it doesn't work?

Thank you in advance.

 

[Easyrider83]

Simply remove external reference and you will see the same results.
Write your own ADC_Read function where external reference will be used.

 

[milan.rajik]

Only if registers are configured to use Vref+ and Vref- pins for reference voltages the ADC will use it else it uses internal Vref+ and Vref- of 5V and 0V.