Category Archives: misc hacks

Particle Sniffer For Pollution Point Sources

When measuring air quality, particulate matter is an important metric to watch. The PM2.5 rating refers to particulate matter that has a diameter of less than 2.5 micrometers. While it’s often measured by authorities on a city-wide basis, [rabbitcreek] wanted a way to track down point sources indoors.

The tool …read more

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Posted in misc hacks, particulate, particulate analysis, particulates, pm2.5 | Leave a comment

Ammo Can Battery; 50 Ah LiFePO4 Clad in Army Green

For the price of a mid-range Android phone, [Kenneth Finnegan] turned a 50 caliber ammo can into a 50 amp-hour portable power supply. The battery pack uses four 3.5 V LiFePO4 cells wired in series to achieve a nominal 12 V supply that stands in for a traditional lead-acid …read more

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Posted in ammo can, ammo can power box, battery management system, bms, LiFePO4, Lithium-ion battery, misc hacks | Leave a comment

Put Down New Roots From Home With A Free-Form Tree Of Life

Mandalas are meditative objects that mean many things to myriad religions. Psychologist Carl Jung equated them with the concept of the Self as a whole, and put forth the notion that an urge to create mandalas signifies a period of intense personal growth.

[Sander van de Bor] took up the …read more

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Posted in art, Circuit Sculpture, led, lifehacks, mandala, misc hacks, tree of life | Leave a comment

Bee Counter Will Have You Up to Your Nectar In Hive Data

While we admit that free honey sounds pretty good, beekeeping is not some set-it-and-forget-it hobby where you can just put bees in a box and come back in a month to collect the goods. With the world’s bee population in decline, it’s more important than ever to monitor the health …read more

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Posted in bee hive, beekeeping, bees, Feather, header, ir leds, ItsyBitsy, Microcontrollers, misc hacks | Leave a comment

Thermochromic Display Tells You the Temperature Despite Your Current Mood

Readers who survived the 1970s will no doubt remember the “mood ring” fad, where a liquid crystal mounted to a ring would magically reveal your current emotional state to all and sundry by changing color. This nifty thermochromic display is based on the same principle, and while it might not …read more

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Posted in dht22, heater, liquid crystal, misc hacks, pcb, resistive, SAMD21E18, thermochromic | Leave a comment

“Glixie” Puts a New Spin on Glow-In-The-Dark Displays

For as many projects as we see using Nixie tubes in new and unusual ways, there’s a smaller but often very interesting cohort of displays that fit into the “Nixie-like” category. These are projects where something other than the discharge of noble gasses is being used to form characters. This …read more

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Posted in dot matric, glow in the dark, led, misc hacks, nixie, phosphorescent, uv | Leave a comment

Rubber Bands Can Secure Your Sanity

One of the greatest joys of being a child was figuring out that rubber bands make awesome sounds when they are plucked, and that the sound is easily changed by stretching the band to different lengths. For those of us who need firsthand experience to truly understand how the world …read more

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Posted in broom handle, diy instrument, misc hacks, musical hacks, piezo, piezo disk, rubber band, rubber band bass | Leave a comment

Using Additives For Better Performing Epoxy

Epoxy resins are an important material in many fields. Used on their own as an adhesive, used as a coating, or used in concert with fiber materials to make composites, their high strength and light weight makes them useful in many applications. [Tech Ingredients] decided to explore how combining basic …read more

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Posted in Additive, Chemistry, chemistry hacks, epoxy, misc hacks | Leave a comment

Digital Designer Teaches High School

We wish we had met [Mr. Mueller] when we were in high school. After 20 years as a digital design engineer, he decided to teach a digital electronics class at the high school level at LASA high school in Austin, Texas. He’s been doing it for seven years and has …read more

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Posted in basic electronics, course material, curriculum, digital design, education, high school, misc hacks | Leave a comment