Have a function but need it to be triggered by another Arduino Board pin

Hey there everyone
Basically I have a Blynk_Write function but I need it to be triggered by another Arduino Board pin, the reason that I am using Blynk_write is because whenever I try to use Blynk syntax outside Blynk_Write it gives an error.
If I remove parameter for Blynk_write and write “V1.asStr()” it also gives an error.

You are describing a Bridge command, but it appears you are using the vPin and parameter command incorrectly… have you followed the Documents and examples sketch for the bridge command?

http://docs.blynk.cc/#widgets-other-bridge