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Digital

Interrupts on all Arduino pins with PCINT

Isolated inputs and outputs with Arduino and optocoupler

Switching Loads with Arduino and Solid State Relay

More digital pins with Arduino and PCF8574 I2C I/O expander

More outputs/inputs in Arduino with CD74HC4067 multiplexer

Handling loads of more than 220V with Arduino and relay output

Using MOSFET as a digital switch with Arduino and IRF520N

Controlling Large Loads with Arduino and MOSFET Transistor

Touch switch with Arduino and touchless capacitive sensor

Higher power outputs with Arduino and BJT transistor