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Topic: Voltage input on digital pin (Arduino Uno) (Read 1 time) previous topic - next topic


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


Unfortunately, that didn't help me  :~

Well, I didn't "say" that, but you asked about "0.5V"
In fact there's a point at which a voltage "must be" a HIGH and a similar point where some voltage "must be" a LOW, but there's a window of uncertainty between the two, a sort of no-man's land which should be avoided.

What voltage is that between? The uncertainty about "HIGH" and "LOW".
If you should say a voltage, were it would not anymore register a value as "HIGH" or the highest voltage you can think off, were it not at all would read it as "HIGH". (at least theoretically?)
Sorry... But I really need some sort of number, since I have made an error with an operational amplifier...
Hope there is some kind of possible answer  :(


Unfortunately, that didn't help me

It's all there in the data sheet.
In what way didn't it help you?
"Pete, it's a fool looks for logic in the chambers of the human heart." Ulysses Everett McGill.
Do not send technical questions via personal messaging - they will be ignored.


For an input to be seen as a logic low it must be below 0.3 * Vcc so at 5V Vcc this is below 1.5V

For an input to be seen as a logic high it must be above 0.6 * Vcc so at 5V Vcc this is above 3V

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