📄️ Room Sensors
Multiple devices with identical configurations, differing only by name (e.g., thermometers spread across your home).
📄️ Shift Registers
You can build a PLC-like device with many inputs and outputs using 74HC165 and 74HC595 shift registers. This is ideal for scenarios where you need dozens of GPIO pins for switches, sensors, or actuators, but have limited physical pins on your microcontroller.