Help with Circuit

[Art]

So now the Volt meter is ok, I'd like to add an Ammeter into the same circuit to
display the current output of whatever device is being used to charge the battery (probably solar).

I've never tried to make an ammeter before. This is a little hint I found off the net:

put a small value precision resistor (like a 0.01 ohm 5-20W)in series with the load and measure the voltage drop across the resistor. Let's say the voltage across the resistor is 1 Volt, then 1V/0.01=100 Amps.

So it sounds like I could read the voltage across the resistor with another
ADC input pin.
This being an independent supply from that powering the pic circuit,
I should be able to connect directly to the resistor?
Thanks, Art.

[Ioannis]

I hope you did not tried it yet!

In that case, think to put this resistor on the ground terminal and not on the + line.

After this an op-amp I think is necessary to amplify the signal by a factor of X to raise the voltage from the resistor (a few mV) up to the max level the ADC will need.

A good op-amp might be the LMC66x series from National or the Microchip's low voltage op-amps (not tried them yet).

Ioannis

[Art]

Thanks for the hint