The joys of overengineering a simple gift. [Joren] wanted to create a dress for his daughter’s fourth birthday that would react with lights in sequence for a song from Frozen. The dress and an LED strip, along with a digital microphone and a battery were easy to procure. But how to make it all work? An ESP32 did the trick.
While the project’s name–Olaf–sounds like it was from Frozen, according to the GitHub page it actually means Overly Lightweight Acoustic Fingerprinting. Right. However, as the name implies, it can learn to identify any sound you want.
Continue reading “Olaf Lets An ESP32 Listen To The Music”
We see all manner of electronics enclosures pass through these hallowed pages. Lasercut wooden builds with fancy kerf bending, expertly prepared acrylic boxes, and even the occasional device cast in concrete. [Mike Kohn] decided that all of these were too permanent, however, and chose a different material – ice.
[Mike] shares the ups and downs of his experiments with electronics and frozen water. Initial tests with a circuit sealed in DAP Ultra Clear were largely successful. A tilt sensor was installed to allow the batteries to remain undrained during the freezing process, and once freed after a few hours of thawing, the circuit was operational. Later builds required some more work – the RC car in particular took a few attempts to avoid the mold leaking. The ice hands are a particular highlight, though – created with rubber gloves, these would be a remarkably spooky decoration come Halloween.
It’s a study in the techniques required to work with this ephemeral material, and there’s a few lessons to learn. Sealing electronics is good, and the best results are with simple circuits with a few LEDs that make everything glow nicely.
If you’re looking for other ideas, you could always create a frozen lens for photographical purposes. Video after the break.
Continue reading “Electronics On Ice”
Frustration is tough to deal with. When driven to the point of tears it’s sometimes a short step to lashing out irrationally. Focus in these situations helps, channeling your frustration into something useful. [Yi-Fei Chen] has done that — quite literally — by designing a gun that fires her shed tears.
The gun’s design manifested following a strenuous midterm presentation. Her insistent tutor drove her to tears as frustration clashed with the deep cultural values of her native Taiwan which prevented her from speaking up against authority.
A silicone cup resting against her cheek collects the tears which flow into a chamber of the gun to be frozen. Removing the safety slide preps the round to be fired by the pressure plate trigger on the gun’s rear. It’s simple and it works — tutors beware.
Continue reading “Tear Gun Transmutes Emotions Into Firepower”
When life gives you lemons, you make lemonade. When life gives you freezing cold temperatures and a yard full of snow, you make binary clocks out of ice. At least that’s what [Dennis] does, anyway.
[Dennis’] clock is made from several cylindrical blocks of ice stacked on top of one another. There are six columns of ice blocks. The blocks were made by pouring water into empty margarine containers and freezing them. Once they were frozen, [Dennis] bore a 5/16″ hole into the bottom of each block to house an LED. Wires ran from the LEDs back into the drainage port of a cooler.
The cooler housed the main electronics. The LED controller board is of [Dennis’] own design. It contains six TLC59282 chips allowing for control of up to 96 LEDs. Each chip has its output lines running to two RJ45 connectors. [Dennis] couldn’t just use one because one of the eight wires in the connector was used as a common power line. The main CPU is an Arduino. It’s hooked up to a DS3234 Real Time Clock in order to keep accurate time. The oscillator monitors temperature in order to keep accurate time even in the dead of winter. Continue reading “Binary Clock Fit For Queen Elsa’s Ice Palace”