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Arduino Interrupt Tutorial: Find out how many external there are on an Arduino Uno - The answer is more than two!
Switch debounce: Three different ways to debounce input push switches with one amazing method that you can't miss.
A tutorial on using the ADS1115 precision 16 bit ADC for low power use.
With the ADXL345 acellerometer you can detect up to 16g! You can also find out how to use it for tap detection and more.
ESP8266 Webserver: This code shows you how to use lua to create a webserver using html button inputs to contrtol an LED on the ESP module.
How to flash nodemcu firmware into a ESP8266 so you can use the LUA scripting language.