We can extrapolate our previously designed logic with more than one switch.
There are many ways to use multiple switches, and, in general, multiple inputs on the Arduino. We're going to see a cheap and easy first way right now. This way doesn't involve multiplexing a lot of inputs on only a couple of Arduino inputs but a basic one to one wiring where each switch is wired to one input. We'll learn multiplexing a bit later (in the next chapter).
Following is the circuit diagram required to work with multiple switches:
The schematic is an extrapolation of the ...