Just a quick question: what voltage rnge can I apply to digital input for HIGH on a 5V or a 3.3V Arduino? I would like to use a RTC using 5V and a OLED display using 3.3V If the RTC takes 3.3V as HIGH and the microcontroller@3.3V takes 5V as HIGH without problems, I needn't use a logic level shifte…

Voltage range for logic level

JoeN November 28, 2012, 6:51pm 3

This has been linked before but it is well worth adding to your bookmarks if you haven't yet:

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