Datasheet

Serial pins

RX and TX are the serial control and bootloading pins, and are how you will spend most of your time communicating

with the ESP module.

The TX pin is the output

from

the module and is 3.3V logic.

The RX pin is the input

into

the module and is 5V compliant (there is a level shifter on this pin)

The pins are available in two places, one set is on the right side breakout. The same pins are also at the bottom on the

"FTDI/Serial" breakout