In this instructable I'm going to show you how to send notifications to your phone from your when programing with Arduino IDE.
Picture of Servo Control
Arduino IDE NodeMCU Digital Input Basics | Henry's Bench
Arduino is a microcontroller based prototyping board that runs on small DC power. A Relay is a device that helps microcontrollers (or microcontroller based boards) like Arduino to switch on or off different household appliances like motors, lights, water heaters, television and fans etc.
Have you imagined you project to last on regular AA batteries for almost 5 years? This is possible with the ESP32 chip. Find this and other hardware projects on Hackster.io.