Arduino suddenly stops taking input

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while working on robot, did several tests. in of them worked fine. however, suddenly, arduino uno stopped accepting input controller. 6 pins used accept input. double checked voltage make sure not putting in much. wasn't. how can fix problem? there no other available pins me use.

hi,have tried reprogramming uno, or programming uno simple input/output debug program test inputs.
if have dmm can check inputs on uno getting highs , lows when program not responding?

tom....... :)


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