How can I use Interrupt ?

[Ksirirux]

Board: KC868-A8S
platform : Platform IO on vscode

My Project require Interrupt Signal .. about water flow rate from flow meter 
Can I connect some gpio for interrupt process ? 

Thank you so much.

[admin]

you can connect to digital input port.

[Ksirirux]

Excuse me. Do you have example?
What gpio that INT pin of the PCF8574 is connect?

Thank you

[admin]

you can firstly use "GPIO" in photo.
DI1-DI8 use by PCF8574, so the speed limited by PCF8574 bus scan speed.
   

[Ksirirux]

Is it gpio 14 alright?

[admin]

yes