> I have a circuit where I have a pic16f877 that commands four water pumps.
> The connections between the pic and the pumps is made this way:
> PIC -> 5k6 resistor -> Bc337 transistor -> relay -> contactor -> pump
> I start the pumps in secuence and when a presure sensor signals, I shut 
> down
> every pump one by one.
> When the last pump stops, the pic resets, and it should not.

How are you getting the power for the PIC? It could be that a power spike 
due to the pump turning off resets the PIC. 

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