Contact arduino and excel

How can sending functions frome arduino to excel?

You should check out this topic

Have used it here and found it to be exceptionally useful.

Are you using the online editor as this section mainly deals with that software ?

Bob.

Could you take a few moments to Learn How To Use The Forum.
Other general help and troubleshooting advice can be found here.
It will help you get the best out of the forum in the future.