A02YYUW with ESP8622

The A02YYUW is just a Serial Port sensor. So the sample code of the Arduino could also used on the ESP8266.

wikipage:  https://wiki.dfrobot.com/_A02YYUW_Waterproof_Ultrasonic_Sensor_SKU_SEN0311#target_5

The only problem of this code is that the ESP8266 could not use the software Serial Library that used on the Arduino.

But you could found lots of SoftSerial Library for the ESP32/ESP8266 on the Github.

And here is what I found:

https://github.com/plerup/espsoftwareserial

So you just need to slightly change the sample of the wikipage.(Include the espsoftwareserial library, and Instantiate an object with a class from this library)

That should be good.

I dont know how you are programming your board, but maybe do it with Arduino IDE. Lot of examples 

Sorry I meant ESP 8266 obviously…