This document contains instructions for several Arduino projects: 1. Blinking an LED using Arduino by connecting the LED to pins on the Arduino board and uploading a blinking code. 2. Checking voltage variations of an Arduino Uno on the IoT platforms Ubidots and ThingSpeak by connecting sensors to read voltage and uploading programs to send data to the platforms. 3. Making an LED glow using an IR sensor, where the LED turns on when a hand gets close to the sensor, detected by the Arduino reading the IR sensor pin.