LED BarGraph Display and Remote Relay Control using ESP8266 through WebSocket
IoT module which show water level information on LED bargraph and turn on/off relay depending on data received from server. This module is using NodeMcu (ESP8266 12E)and Websocket for communication.
http://www.techzonemind.com/led-bargraph-and-relay-controll-using-esp8266-through-websocket/