This PCB is designed to be a flexible way of building wireless modulair sensor and switching devices capable of sending and receiving data over various protocols. The heart of this PCB is the amazing ESP wifi chip. This board gives you access to most of its GPIO pins, as well as the I2C protocol and the ADC. It's possible to program the ESP while it is soldered to the board. While it is possible to program the ESP using the Arduino IDE I strongly advice you to check out the open source ESP firmware EasyESP. This makes programming a breeze since it utilizes a browser based programming option wich contains a lot of pre installed sensors. You just have to activate them. It's also capable of sending/receiving data to and from different home automation controllers via different protocols including MQTT and HTTP. This is the firstPCB i designed without any training to do so. So please keep me alive in the comments.