A PIC Ammeter

[PeterDove]

Hi All,

I have finally built myself a very nice constant voltage, constant current power supply based on the L200C chip.

Now what I want to do is using Potentimeters is allow the voltage and current to be adjusted by the user and displayed using LCD numeric display. I have a few books on PIC programming though I havent yet got a programmer to start experiementing. I have read the books though. I will have a PIC programmer arriving soon.

So there is a sample in the book of making a Voltmeter... my question is.. how would the PIC measure the current? Anyone got any suggestions?

Thanks

Peter

 

[eng1]

my question is.. how would the PIC measure the current? Anyone got any suggestions?

It can't measure the current directly. If the current flows through a known resistance (fractions of ohm), then you can sense the voltage drop, amplify it and feed it directly to the ADC of your PIC.