4x Relay Switch + Arduino + Wifi + MQTT with Home Assistant

A by-product of days and nights of reading, watching tutorial videos, and getting my hands dirty :-) For Parts, Project Sketch, MQTT and Home Assistant settings - go to https://community.home-assistant.io/t/arduino-relay-switches-over-wifi-controlled-via-hass-mqtt-comes-with-ota-support/13439/4 where I published and shared my work back to the community.