arduino and pulse sensor

[sasa]

why my pulse sensor and processing visual does not work properly?
i'm do not understand the programming code well.
it always said error "was not declared in this scope"
how to declared it in arduino program?

[Idris]

Hi sasa,

Could you share some photos about your hardware wiring, error message and your programming code? A few clear photos will help a lot.

[Ali_Challenger]

I guess you got this error due to wrong adding the libraries to the arduino directory path, or maybe adding them in different names.