transistors - Switching a 3V led series with an Arduino uno with 5V supply - Electrical Engineering Stack Exchange
DIY- Powering a 3 volt LED from a 4.5V supply | Electricians Forums | Electrical Safety Advice | Talk Electrician Forum
Simple Basic LED Circuit (How to Use LEDs) : 4 Steps - Instructables
led - Resistor requirement for 3.3 V supply - Electrical Engineering Stack Exchange
Finding the right resistor for your circuit | by Rodrigo Sousa Coutinho | Arduino Playground | Medium
Simple Basic LED Circuit (How to Use LEDs) : 4 Steps - Instructables
LED Resistor Calculator
LED Resistor Calculator
Choosing the Resistor to Use With LEDs : 3 Steps - Instructables
Can you power a 3.3 led with an arduino 5v output? - Electrical Engineering Stack Exchange
5mm Cool / Clear White Breathing / Fading LED - Super Bright
How To Run Mini Led In 3v,5v,8v,12v,18v,24v,220v Using Resistor. - YouTube
How to select resistor value for LED with simple calculation (Ohm's Law) - YouTube
5volt to 3.3volt|how to use 5v to 3v DC Resistance or Diode|Electronics project by Punit Kumar| - YouTube
L1: Turning on an LED - Physical Computing
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Basics: Picking Resistors for LEDs | Evil Mad Scientist Laboratories
Connect LED to 12v 5v and 3.3v PCI power box upgrade - YouTube
How to Reduce Voltage with Resistors
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How To Calculate LED's Resistor and Watt of it of12v & 5v Or any other volts | Electronics Teaching - YouTube
Amazon.com: 5mm 6v Pre-Wired Red LED - Ultra Bright (3v, 4v, 5v, 6v) (Pack of 5) : Industrial & Scientific
Revisiting Volts | All About LEDs | Adafruit Learning System
The resistor
Stak - Resistors for use with LEDs - 3.3V, 5V, 6V, 9V, 12V - 100 pack