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Topic: Does serial comm with Uno need level shifting? (Read 373 times) previous topic - next topic


Feb 04, 2019, 05:24 pm Last Edit: Feb 04, 2019, 06:07 pm by Byte3
The TX and RX pins on the MKR 1010, if I want to link to the same pins on a Uno: Does it need to be level shifted for it to work?

I think the answer is yes


You can get by without level shifting on the TX pin of the MKR 1010, because the ~3.3 V logic level of the MKR 1010 is high enough to be recognized as a HIGH by the Uno. You're correct that you can't subject the MKR 1010's RX pin to the ~5 V logic level of the Uno, so that pin does need level shifting.

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