Hi Peter,

Thank you for your reply. Our approach is interesting but

I program with MPLAB. It has no integrated 'PWM'  function. I have to
program a PWM to control the speed of a DC-Motor by using the 16C84 timer.
It seems me difficult to program two independent PWM in the same PIC without
dummy software loop...

Regards
Robert Rivoir

        -----Original Message-----
        From:   Peter Cousens [SMTP:cousens@her.forthnet.gr]
        Sent:   jeudi 24 septembre 1998 00:28
        To:     Rivoir Robert
        Subject:        Re: Cheap PIC analog multimeter

        Rivoir Robert wrote:
        >
        > Hi Peter,
        > Thanks for your reply.
        >
        > I am very interested by your circuit
        > I want to make 'intelligent' battery switcher / solar charger for
my ZAP
        > electric bicycle.
        > Can you send me your schema ?
        >
        > Many thanks in advance
        >
        > Robert Rivoir

        Here is the code and the circuit.
        The 16f84 hooks up to a lcd shown at the top of the schematic and
the
        5M6
        resistors form an attenuator that automatically ajusts from 5 to 40V
        full scale
        Why 5M6 ? I've got thousands of them, I should have put them on
        portb.0,1,2
        it would have made driving the attenuator pins much easier.

        It is simple, I output a voltage with pwm(8bit)on portb.0 then read
        portb.2
        then output a higher or lower pwm voltage depending on if portb.2 is
        high or
        low when portb.2 changes from low to high I know the voltage I'm
        measuring
        is equal to my pwm voltage