Michael Hearn wrote:

> I just want to check whether it is true that the PIC models that can
> deal with analogue ports can only be blown once.
> I am doing a project at school that involves making a robot that can
follow
> a white line made of masking tape (MicroMouse by the IEE) and I was
> wondering what sort of motor we should use. We have a choice between DC
and
> stepper motors but it seems to us that the 16C84 (the chip we use at the
> moment) cannot deal with analogue signals. Is this true and what other
> chips can do this? Also, is it true that the chips that can do this are
> blow once? I just wanted to clear up a few inconsistencies.

The PIC16C84 or F84 are the only PIC's with EEPROM program memory. (BTW:
Microchip announced more)
The PICx8x family has no AD circuitry on board. However you can easily
create an AD convertor with a resistor and a capacitor. This is explained
in AN552.

Otherwise, use a member of the PIC16C7x family. They have an AD converter
on-board, but are OTP (one time programmable. For testing and development
in this case; use a windowed version witch is UV erasable.

Success