Compact M&M Sorter Goes Anywhere
Let’s face it — eating different colored candy like M&Ms or Skittles is just a little more fun if you sort your pile by color first. The not-fun part is …read more Continue reading Compact M&M Sorter Goes Anywhere
Category Archives: CdS cell
[Emily]’s Eerie Educational Electric Eyeball Entertains
Like many of us, [Emily’s Electric Oddities] has had a lot of time for projects over the past year or so, including one that had been kicking around since late …read more Continue reading [Emily]’s Eerie Educational Electric Eyeball Entertains
Co41D 2020 MIDI Theremin Sounds Pretty Sick
As the pandemic rages on, so does the desire to spend the idle hours tinkering. [knaylor1] spent the second UK lockdown making a sweet Theremin-inspired noise machine with a low parts count that looks like a ton of fun.
It works like this: either shine some light on the photocells, …read more
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Tiny Circuit Sculpture Keeps the Night Watch
If you’re planning to get into circuit sculpture one of these days, it would probably be best to start with something small and simple, instead of trying to make a crazy light-up spaceship or something with a lot of curves on the first go. A small form factor doesn’t necessarily …read more
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Score Big Against Boredom with Tabletop Bowling
Bowling has been around since ancient Egypt and continues to entertain people of all ages, especially once they roll out the fog machine and hit the blacklights. But why pay all that money to don used shoes and drink watered-down beer? Just build a tabletop bowling alley in your spare …read more
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Lovebox Gives Infinite Treats Sweeter Than Chocolate
Want to make a special Valentine’s Day gift that keeps on giving well past the holiday? We do too, especially if it’s something as cute as [Marcel Stör]’s Lovebox. This is a relatively simple build, but it’s the kind that lets you make someone’s day over and over again.
The …read more
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Make A Mean-Sounding Synth From Average Components
A while back, [lonesoulsurfer] stumbled upon a mind-blowing little DIY synth on YouTube and had to make one of his own. We don’t blame him one bit for that, ’cause we’ve been down that cavernous rabbit hole ourselves. You might want to build one too, after you hear the deliciously …read more
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Shedding A Bit Of Light On Some Logic
When it comes to logic technologies, we like to think we’ve seen them all here at Hackaday. But our community never ceases to surprise us with its variety and ingenuity, so it should be a surprise that [Dr Cockroach] has delivered one we’ve not seen before. Light logic doesn’t use the conventional active devices you’d expect such as transistors, tubes, or even relays. Instead, it uses LEDs and CdS cells to make rudimentary switches. So far there is a NAND, a NOR, and a set-reset latch that appears in the video below the break, and it is not inconceivable that …read more
Intuitive Musical Books Accompany Alzheimer’s Patients’ Memories
If you have a loved one with Alzheimer’s, you know how difficult it can be to hold a conversation with them that doesn’t constantly go in circles. A good way to keep them focused is to use conversation pieces like pictures and familiar objects from their past. Something particularly poignant might uncork a flood of memories.
Adding familiar music to these images can be doubly beneficial. [Annelle] found this out when she showed her mother a musical children’s book that plays nursery rhymes. Her mother’s face lit up with joy when she heard those well-known tunes, and her reaction inspired …read more
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Lasers, Mirrors, and Sensors Combine in an Optical Bench Game
Who would have thought you could make a game out of an optical bench? [Chris Mitchell] did, and while we were skeptical at first, his laser Light Bender game has some potential. Just watch your eyes.
The premise is simple: direct the beam of a colored laser to the correct target before time runs out. [Chris] used laser-cut acrylic for his playfield, which has nine square cutouts arranged in a grid. Red, green, and blue laser pointers line the bottom of the grid, with photosensors and RGB LEDs lining the grid on the other three sides. Play starts with a …read more
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