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Topic: What is the voltage at the RX pin of the Arduino Nano? (Read 115 times) previous topic - next topic

DryRun

Hi,

I want to connect an ESP8266 to an Arduino Nano 3.0 but i am wondering what is the voltage at the RX pin of the Nano:
1. when data is NOT being transferred from the ESP
2. when data is being transferred from the ESP at 3.3V logic level voltage?

DrAzzy

5v, from the tx pin of the attached serial adapter.

Esp8266 pins are 5v tolerant (per Espressif posts and tests by users - theres a nice writeup of a guy who verified that there is no excessive current when a pin is connected to 5v) - this wasnt widely known until recently due to the shoddy documentation for the esp8266.

There is generally a resistor in series with that pin, so when its directly connected to something else, that will be able to overpower the setial interface chip.
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