As an example of what you can do ... Some things only live on the diagram, like a timer or a connection to an Arduino. But some things live on both like switches, LEDs, graphs, and so on.

In short, your backpack is based on PCF8574T and the address connections (A0-A1- A2) are not bridged with solder it will have the slave address 0x27. Reference circuit diagram of an Arduino-compatible ...

You’ll find the voice recognition diagram after the break as well. You could try to go completely graphical with this project. There’s the option of programming the Arduino side of the project ...