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Re: Fertilizer pump fix...

>an LED just light and stay on.

>It might also be possible to use the stepper motor's pulses to pulse the

Both darn good ideas.  Certainly worth a try.  I'll open it up and get 
my tester out and see what the motor is getting.  Sure would be a lot 
easier to use the motor and unit power rather than provide my own.  That 
makes me thing...  How about just wiring up one of the motor wires to the 
ir sensor directly?  Bypass the middleman as it were...