Voltage input on digital pin (Arduino Uno)

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Tortun:
Hello all :slight_smile:

What is the lower limit of voltage, the Arduino Uno will register on one of the digital pins?

For example, a curcuit is connected trough Arduino 5V and GND and have a output at only 0,5 volt. Will the digital input pin register that?

Thanks :slight_smile:

Those values are best defined and explained in the Atmel ATmega329p datasheet along with all the other electrical specifications for the chip.

Lefty