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Inputs

How to use the ADC analog inputs in an ESP32

Interrupts on all Arduino pins with PCINT

Adapting 3.3V to 5V (and vice versa) in Arduino with Level Shifter

More accurate analog inputs by measuring Vcc on Arduino

Isolated inputs and outputs with Arduino and optocoupler

Measuring voltages up to 25V with Arduino and FZ0430

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

More outputs/inputs in Arduino with CD74HC4067 multiplexer

16-bit analog input with Arduino and ADS1115 ADC

Touch switch with Arduino and touchless capacitive sensor