First open ESP8266_Code.ino file from Duino coin repository
Fill your WiFi name
WiFi password
username of Duino wallet
and optimal rig name
Check Generic ESP8266 Module from board manager
Check used com port, for me its COM3
Upload sketch to your board
After sketch uploads, open Serial monitor and choose port speed 500000.
If all OK then you will see hashrate.
For ESP8266 and Duino coin miner 2.74, average hashrate is 4.62 kH/s
Video
user13