control arduino LED-
i use grasshopper try it and it can work(also can control led turn off and turn on).
but why i use same way to connected node it can’t work?
I am no expert but you are feeding a list (albeit it has only one element its still a list) into the Port input. Try giving it just a number.
Ps. Looking at the answer that @Kulkul has provided below it has to do with you forgetting to open the port not with the input type. Anyways, why ask a question like this again, after it was answered before?
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@NIEN-CHIN_WU Is this the same topic Dynamo connected to arduino which you have discussed earlier?
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yes,and today it can work!!
and found problem is software version i don’t why when download new version everything can solved it. 