Use this forum to chat about hardware specific topics for the ESP8266 (peripherals, memory, clocks, JTAG, programming)

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By TeleHstu
#54543 Hi,

I have recently purchased a Wemos D1 to play around with, and although I realize it is a very powerful chip, I've decided to communicate my sensors with it via an Arduino UNO (UART).. Now, my question is do I still need to power my UNO with a 3.3v to allow it to communicate safely with Wemos? Or can I just power the UNO with 5v and Wemos will do the rest for me?

Any help would be great