The objective of this post is to explain how to use a 4×4 matrix keypad with the ESP8266. For simplicity, we will assume the use of the ESP8266 integrated in a NodeMCU board.
The objective of this post is to describe a cheap rain sensor that can be used to detect rain with microcontrollers such as the Arduino or the ESP8266.
This post lists some ICs commonly used in electronic projects and explains how to buy them for cheap prices at eBay.
This post lists some basic components for creating projects that require soldering and explains how to buy them for cheap prices at eBay.