All About LEDs Created by Tyler Cooper Table of Contents Overview 3 What is an LED 3 All the different sizes and colors 5 What are LEDs used for 7 Changing the brightness with resistors 10 Changing the brightness with voltage 11 Max brightness 13 The LED datasheet 14 Forward Voltage and KVL 15 Quick Quiz 17 Ohm s Law 17 Solving for the current 18 Revisiting Resistors 20 Revisiting Volts 21 Which to Adjust 23 Adjusting Brightness 24 Adafruit Industries Page 2 of 29