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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
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