It is designed for smart home, internet of thing and others diy project. I programmed the esp to start a portal through which i can derive the relay by triggering. So, there needs to be a transistor in.
The Schematic esp01dualrelay
We developed this board for you to create any automation application with wifi control.
Web What Is It And Why Use The Wifi Esp8266 Relay Board?
I use nothing more than an.