Hi there ,

I was wondering if any of u guys are familiar with ADC programming . I am currently using a Pic 18f46k20 . My project involves measuring my battery voltage where when it reaches a certain level , the PIC recognizes it and turn on the charging circuit for the battery. I am having a 12V power supply. I have scaled down the voltage from 12v to 3v using a voltage divider circuit but i am not sure on the ADC conversion part. I would be really grateful if anyone decided to help out. Thank u

 

Well, post your code.. Did you already look what datasheet reports about ADC operations?

 

I'd recommend using a voltage regulator rather than a simple voltage divider circuit for bringing down the voltage as the rest of your circuit that you would like to power may affect the voltage it receives.

 

Note to self: We really could use a tutorial on D2A accuracy and resolution.

Try to write one, OK?

 

I'd recommend using a voltage regulator rather than a simple voltage divider circuit for bringing down the voltage as the rest of your circuit that you would like to power may affect the voltage it receives.

I think OP is talking about the analog input being scaled down. So, if the battery is at 6V, the analog input will be 1.5V, etc.