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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
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