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Re: PNP versus NPN sensors
True, but that's typically the power rails which self protect, not the signal inputs.
Was able to test last night. Unfortunately the web interface had become corrupted and wasn't able to get status messages. I did connect battery voltage (~12V) to the DIO signal line and no smoke occurred. Checked DIO voltage & expected signals afterwards and it was still operating as expected, no apparent damage. Will see if I can get it to talk.
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Originally Posted by texarkana
I would not want the task of devising a system that 50,000 very smart people try to outwit.
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The engineers and mentors provide the "I" in FIRST and FIRST would be nowhere near where it is today without this exceptional leadership shown by so many of these volunteers. - Chris Fultz [more] 
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