Category Archives: led

Chaotic Oscillator From Antique Logic

While working on recreating an “ancient” (read: 60-year-old) logic circuit type known as resistor-transistor logic, [Tim] stumbled across a circuit with an unexpected oscillation. The oscillation appeared to be random and had a wide range of frequency values. Not one to miss out on a serendipitous moment, he realized that …read more

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Posted in chaotic, circuit, hardware, led, logic, oscillator, random, resistor-transistor, RTL, transistor | Leave a comment

Office Status Light Turns “Do Not Disturb” To “Busy”

Open-plan offices with too many desks crammed into them are the scourge of many a tech start-up, and at [Danny Salzman]’s employer, distractions reached an all-time high. His boss instigated a free/busy indicator using coloured cards, but he felt he could do one better and came up with an IoT …read more

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Posted in led, led hacks, particle photon, status light | Leave a comment

Tiny Laser Cutter Puts Micro Steppers to Work

The influx of cheap laser cutters from China has been a boon to the maker movement, if at the cost of a lot of tinkering to just get the thing to work. So some people just prefer to roll their own, figuring that starting from scratch means you get exactly …read more

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Posted in cnc hacks, diode, dvd, ESP32, laser, laser cutter, laser hacks, led, linear drive, stepper | Leave a comment

Dim Hallway Gets Lighting Upgrade

There’s nothing worse than a lightswitch that’s nowhere near where it should be, leaving you fumbling around in the dark. [supersquirrel72] had just this problem, and decided to put an Arduino to work instead.

Rather than using the original mains lighting that was poorly positioned and not enough to light …read more

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Posted in led, led hacks, lighting, rtc | Leave a comment

A Pulse Oximeter From Very Little

Against the backdrop of a global respiratory virus pandemic, it’s likely that more than a few readers have been thinking about pulse oximeters. You may even have looked at one closely and seen that it’s little more than a device which shines light through your finger, and wondered how they …read more

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Posted in ir, led, Medical hacks, oximeter, photodiode, pulse oximeter | Leave a comment

Reverse Engineering Saves Trashed LED Panels

While out riding his bike, [Hammond Pearce] came across a dumpster overflowing with large LED panels. Despite the fact that the model numbers didn’t reveal anything helpful after some online searching, he decided to pedal off with as many as he could safely carry. The COVID-19 lockdown left him with …read more

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Posted in HUB75, led, led hacks, LED panel, LED sign, protocol, reverse engineering | Leave a comment

Fail of the Week: Bright Idea for LED Signs Goes Bad

Typically when we select a project for “Fail to the Week” honors, it’s because something went wrong with the technology of the project. But the tech of [Leo Fernekes]’ innovative LED sign system was never the problem; it was the realities of scaling up to production as well as the …read more

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Posted in animation, ASIC, design for manufacture, Fail of the Week, fotw, invention, led, patent, rgb, scaling, sign | Leave a comment

RGB Kitchen Uses Pots to Stir Up Color

Anyone who has done anything with RGB LEDs knows that their ability to display pretty much any color is somehow both the best and worst thing about them. How do you get it right? How do you make your results repeatable? [Thomas] has the answer. He dug around in the …read more

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Posted in arduino, Arduino Hacks, led, led hacks, lifehacks, potentiometer, RGB LED | Leave a comment

LED Clock Strips Time Down to Pulses of Light

Nietzsche said (essentially) that time is a flat circle — we are doomed to repeat history whether we remember it or not. This is a stark and sobering thought for sure, but it’s bound to dissipate the longer you look at [andrei.erdei]’s literal realization of time as a flat circle. …read more

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Posted in art, clock, clock hacks, ESP-01, ESP8266, fastLED, led, ws2812 | Leave a comment

LED Heart Beats With The Beholder

Many a maker likes to use their craft to create gifts for loved ones. [Jiří Praus] was celebrating having been married for 5 years, and crafted this beautiful LED heart sculpture to commemorate the occasion.

The outer shell was created by first starting with a 3D printed heart shape. This …read more

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Posted in arduino nano, led, led hacks, wireframe | Leave a comment