Since we now have the script monitoring the shutdown button all the time, we can add extra buttons/switches/jumpers to be monitored at the same time. This will allow us to trigger specific programs or set up particular states just by changing the inputs. The following example allows us to easily switch between automatic DHCP networking (the default networking setup) and using a direct IP address, as used in the Networking directly to a laptop or computer recipe of Chapter 1, Getting Started with a Raspberry Pi 3 Computer, for direct LAN connections.
Add the following components to the previous circuit:
- A 470 ohm resistor
- Two pin headers with a jumper connector (or, optionally, a switch)
- Breadboard wire (solid core) ...
