D. L. Davis wrote:
>
> I built an altimeter with a PIC14000 which I have in bench test now.  I am
> using the 16 bit A/D of the PIC14000 to measure voltage from an air pressure
> sensor.  It is used to control an autopilot, and the PIC runs the autopilot
> servo too.

> I have noticed that the chip measures its own internal reference with good
> accuracy and stability and is nearly insensitive to ambient light (stable to
> about 14 bits).  This much works great, but the measurement of external
> voltages at the pins is hugely affected by light???? (Yes I have checked
> that the voltages at the pins are stable).
>

how about the metal stickers supplied with the floppy disks ?
it's a thin metal layer with adequate glue to keep it anywhere

bye
charley