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Just thinking that when the board moves close to the big motor a strain is put to the connector / solder joint / etc.
Sounds like you checked all that as I thought you would have.
Do I have this correct? The only problem is -- when board gets to close to the big motor, RA.4 does not receive a signal. Every thing else is working "OK".
Dave
Always wear safety glasses while programming.
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Yes, exactly. When the board gets to close to the big motor, RA.4 does not receive signals coming from the Allegro hall-effect chips.Originally Posted by mackrackit
Anything else is working fine and as expected (serial communication, big motor's position other motors tracking etc. etc.).
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My opinion, whatever that is worth.
You need magnetic shielding, not electrical snubber.
The motor case will provide some shielding, but if the case is thin or low permeability, the field will pass through. You have earth grounds, good cable, good connections, etc. This is all that is left.
Several ways to do the shielding, with out seeing the setup I can only make a couple of suggestions.
Wrap the BIG motor in a material with a high magnetic permeability and/or the same around the enclosure with the hal-effects.
Google magnetic shielding This site looks like it has good info http://www.lessemf.com/mag-shld.html.
Post a picture or two and maybe we can be of more help.
Dave
Always wear safety glasses while programming.
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THANK YOU VERY MUCH for the suggestion.
I will put pictures as soon I will mount another machine.
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