Reading curnt consumption with 16F877A

[comwarrior]

what you mean a pic needs 2.5-3 volts? It doesn't say that in the datasheet...

[Ioannis]

Not all PIC ADCs are the same. Look carefully in the data sheets of the specific ADC. You cannot have a voltage spn of 1,7 volt an expct the PIC ADC to have full scale on 0-1,7. The PICs reference voltage has a minimum and this is what you have to look for.

Ioannis

[comwarrior]

ahhh, i see... in that case if i use normal 5V REF and just subtract the low ADC from the high ADC...

After adding in all the software last night, i compiled it... 250 ish lines of pic basic... allmost 1200 words used once compiled

Runs slightly slower, and i still not added in the unfinished auto tune sub routine...

So, looks like i'm going to have to take the core of the control system and drop it to my pic18 and use a 16f877 to do all the maths and the display...
Raises the question of whats the fastest way of getting them to talk without using up bucket loads of IO lines... and preferably without interupts...