Some good points Roman. You know what battery-powered
electric motor circuits can be like - crap everywhere. And this
is a particularly noisy motor too

I've added a 470R series resistor into AN0 and a 1N5819 +
10n from AN0 to ground and it's at least stopped latching, so
maybe this PIC will have a long and happy life. For "belt and
braces" sake though I think I will add those zeners, it's cheap
insurance. After some similar experiences with solenoid
drivers I've found that giving each relay its own diode-isolated
energising cap is a big help, makes far less of a mess of the
PSU when the relay switches as the coil can draw on the cap

If that warning about sub-Vss voltages was in the F877 manual
instead of the Mid-range manual maybe I wouldn't have lost a
PIC pin. Lesson - read damn everything

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