This video is a showcase for a versatile ESP8266 I/O Board which directly runs with AC mains power supply and can be use in the verity of the ways for different purpose. in this video it is been used as a Security Alarm System. We can connect different type of sensors with is I/O Board. in this video i am using a PIR sensor and a Reed Switch based door and window sensor for the demonstration of this project.

$4.9 for 10 PCBs From Seeed Fusion: https://www.seeedstudio.com/fusion.html