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Opt Isolator needed?

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kentken

New Member
I am building a bale stroke counter for a farmer. It has a wire running from the cab to the magnetic switches on the baler. I am using PortB with pull-ups on a 16F872. Would it be a good idea to put in a optical isolator between the switch and the Pic???

Thanks
 

Nigel Goodwin

Super Moderator
Most Helpful Member
If you're running long wires about, it's probably always a good idea. However, presumably the baler uses a diesel engine , and it isn't as noisy an enviroment as using a petrol engine.
 

kentken

New Member
What is long to you? 6', 12' Most have diesel engines some in the front some in the center. Is there anything else to consider?

Kent
 

Nigel Goodwin

Super Moderator
Most Helpful Member
kentken said:
What is long to you? 6', 12' Most have diesel engines some in the front some in the center. Is there anything else to consider?

I would tend to try it and see what happens, using screened leads will help reduce any potential problems as well. Although using opto-isolators won't do any harm, and if you were designing a PCB for the circuit, you may as well include it on the board - then it's always available if needed.
 

motion

New Member
Magnetic switches? Are these sensors powered like those inductive proximity switches? In which case, they usually output a signal from 0Volt to 12V-24V. Unless they are the open-collector type without any other load, you may have to use optoisolators to bring the signal down to 0V-5V levels.
 
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