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To stick to ATmega 328 datasheet (atmel.com/images/… p313), I'd say that anythng below 1.5V (0.3 x Vcc) is cnsidered LOW, and anythng above 3.0V (0.6 x Vcc) is considered HIGH.

jfpoilpret
– jfpoilpret

2015-02-06 06:35:09 +00:00
Commented Feb 6, 2015 at 6:35
... and of course, anything in-between is undetermined, i.e. sometimes HIGH sometimes LOW.

jfpoilpret
– jfpoilpret

2015-02-06 06:35:53 +00:00
Commented Feb 6, 2015 at 6:35

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