Does the resistor need to go before the LED? - YouTube
When and Why do LEDs Need Current Limiting Resistors? | Waveform Lighting
How to select resistor value for LED with simple calculation (Ohm's Law) - YouTube
How to Calculate the Value of Resistor for LEDs Circuits?
Which Resistor Should I Use with my LED? – Kitronik Ltd
What Resistor Do I Need For an LED | DigiKey Electronics
Why does every LED need a resitor - General Electronics - Arduino Forum
Don't Burn Out! Calculating LED Current Limiting Resistor | Benc
Breadboard Layout | Arduino Lesson 2. LEDs | Adafruit Learning System
How do I calculate what resistors I need for RGB LEDs with 3.7V? - Electrical Engineering Stack Exchange
LED Resistor : Circuit Diagram, Working and Example Problems
How to Calculate Resistor Value for LED Lighting | Simply Smarter Circuitry Blog
Arduino: LEDs and resistors
Which Resistor to Use with this LED? | Electronics Repair And Technology News
Basics: Picking Resistors for LEDs | Evil Mad Scientist Laboratories
Why Do You Need Load Resistors for LED Turn Signal Lights - YouTube
Why do LEDs need resistors? - Electronic Guidebook
Guide to LEDs and resistors
Basics: Picking Resistors for LEDs | Evil Mad Scientist Laboratories
Sensors and leds. This need resistors? and how? - Arduino Stack Exchange
Choosing the Resistor to Use With LEDs : 3 Steps - Instructables
How to Calculate the Value of Resistor for LEDs Circuits? | Resistor, Led, Circuit
What Are Resistors Used For? - dummies
LED Light Load Resistor Kit - LED Turn Signal Hyper Flash & Warning Fix | Super Bright LEDs
