Uploaded September 2015 | Updated September 2026, 15 hours ago

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In this video, I demonstrate two different ways to dim an LED, along with electrical analysis of the circuits using a multimeter and an oscilloscope.

Skip to 9:39 for the bit about Arduino PWM.

3d printed lithophanes: createthis.com/products/lithophane

Here is the Arduino gist, as promised in the video: gist.github.com/anonymous/cfb6ff9558f754698b72

These are the products I use or mention in the video:
LED light strip (not the one in the video, but similar and less expensive - this is what I would buy today, personally): [amazon affiliate] amzn.to/1IOkHBN

Arduino Uno Ultimate Starter Kit -- Includes 72 page Instruction Book: [amazon affiliate] amzn.to/1N7pVyB

SainSmart UNO, ATmega328P *USB CABLE Included* for Arduino: [amazon affiliate] amzn.to/1IOkiz6

Fluke 87-V Digital Multimeter: [amazon affiliate] amzn.to/1JGSwIG

Extech EX430 True RMS Autoranging Multimeter with K Type, Capacitance, Frequency, and Duty Cycle: [amazon affiliate] amzn.to/1N7qb0D

RIGOL DS2072A: [amazon affiliate] amzn.to/1N7qf0p

Rigol DS1054Z: [amazon affiliate] amzn.to/1IOkBtR