Help in ESP8266

hello everyone

my project is about connect ultrasonic TO ESP8266 to send data to Arduino NaNO.

the problem is how can I connect ultrasonic to esp8266 without Arduino Device and to connect Esp8266 to Arduino nano or UNO can I connect Rx from ESP8266 TO Tx of arduino Directly and vise versa also where I can find ESP8266.h Library

What's that "ultrasonic" thing's full name? or even better, it's datasheet?

It's HC-SR04

edit your FIRST post. change the title to UNO to ESP8266 communication.

or just google exp8266 UNO and do some reading.