Control A Motor With A Touchpad

There are a surprising wealth of parts inside of old laptops that can be easily scavenged, but often these proprietary tidbits of electronics will need a substantial amount of work to make them useful again. Obviously things such as hard drives and memory can easily be used again, but it’s also possible to get things like screens or batteries to work with other devices with some effort. Now, there’s also a way to reuse the trackpad as well.

This build uses a PS/2 touchpad with a Synaptics chip in it, which integrates pretty smoothly with an Arduino after a few pins on the touchpad are soldered to. Most of the work is done on the touchpad’s built in chip, so once the Arduino receives the input from the touchpad it’s free to do virtually anything with it. In this case, [Kushagra] used it to operate a stepper motor in a few different implementations.

If you have this type of touchpad lying around, all of the code and schematics to make it useful again are available on the project page. An old laptop in the parts bin is sure to have a lot of uses even after you take the screen off, but don’t forget that your old beige PS/2 mouse from 1995 is sure to have some uses like this as well.

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Clear Some Space And Build A Cosmo Clock

Like many of us, [Artistikk] is inspired by astronauts and space travel in general. To keep the inspiration coming, he made the Cosmo Clock — a sleek little clock that changes color whenever an astronaut is launched into space.

As awesome as space is, we’re inspired by the amount of Earth-saving reuse going on in this project. The actual time-telling is coming from a recycled wristwatch movement. [Artistikk] cut a bigger set of hands for it out of a plastic container, and used the lid from another container for the clock’s body.

The launch inquiries are handled by an ESP8266, which uses a Blynk app and some IFTTT magic to get notified whenever NASA yeets an astronaut into space. Then the ESP generates random RGB values and sends them to a single RGB LED. The clock body is small enough that a single LED is bright enough to light up all the parts that aren’t blacked out with thick paper. In case you’re wondering, the pattern around the edge isn’t random, it’s Morse code for ‘sky’, but you probably already knew that, right? Make a dash past the break to take the tour.

Clocks that wind up in space are much more complicated. Check out this tear-down of the clock from a late-90s Soyuz spacecraft.

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Pouring Creativity Into Musical Upcycling Of Plastic Bottles

Convenient and inexpensive, plastic beverage bottles are ubiquitous in modern society. Many of us have a collection of empties at home. We are encouraged to reduce, reuse, and recycle such plastic products and [Kaboom Percussion] playing Disney melodies on their Bottlephone 2.0 (video embedded below) showcases an outstanding melodic creation for the “reuse” column.

Details of this project are outlined in a separate “How we made it” video (also embedded below). Caps of empty bottles are fitted with commodity TR414 air valves. The pitch of each bottle is tuned by adjusting pressure. Different beverage brands were evaluated for pleasing tone of their bottles, with the winners listed. Pressure levels going up to 70 psi means changes in temperature and inevitable air leakage makes keeping this instrument in tune a never-ending task. But that is a relatively simple mechanical procedure. What’s even more impressive on display is the musical performance talent of this team, assisted by some creative video editing. Sadly for us, such skill does not come in a bottle. Alcohol only makes us believe we are skilled without improving actual skill.

But that’s OK, this is Hackaday where we thrive on building machines to perform for us. We hope it won’t be long before a MIDI-controlled variant is built by someone, perhaps incorporating an air compressor for self-tuning capabilities. We’ve featured bottles as musical instruments before, but usually as wind instruments like this bottle organ or the fipple. This is a percussion instrument more along the lines of the wine glass organ. It’s great to see different combinations explored, and we are certain there are more yet to come.

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Make A Vintage-Looking Clock In A Flash

Now that everyone has a phone with a camera, we would bet that fewer people than ever are in the market for a nice vintage flash unit such as the one [lonesoulsurfer] chose for this cool clock build. But here’s something that never goes out of style — a clock that doubles as a conversation piece.

At the heart of this build is a dirt cheap clock unit meant for cars. It also displays the ambient temperature and has a voltage testing mode(!), which could come in handy someday. Although [lonesoulsurfer] didn’t connect a pair of probes, he did cut a wee hole for the temperature sensor to stick out of. He also cut off the SMD buttons and wired new momentaries to the outside of the case.

Although we really like the look of the textured plastic lens over the 7-segments, our favorite part might be the stand and the way [lonesoulsurfer] implemented it. He made a threaded rod by pounding a hex nut into the end of a piece of aluminium tubing, and then dropped a bolt through the bottom of the flash body before closing it up, so it screws on like a camera to a tripod. Take a second and check out the build video after the break.

We love a good clock so much that we just had a contest to find the coolest ways to tell time. In case you missed it, here are the best of the best.

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Espresso Machine Now Powers Plants

This thing has what plants crave! No, not electrolytes exactly — just water, light, and moisture polling every 30 minutes. We think it’s fitting to take something that once manufactured liquid liveliness for humans and turn it into a smart garden that does the same thing for plants.

So let’s just get this out of the way: the espresso machine was abandoned because it was leaking water from a gasket. [The Plant Bot] cleaned it up, replaced the gasket, and got it brewing, and then it started leaking hot water again from the same gasket. We might have gone Office Space on this beautiful machine at that point, but not [The Plant Bot].

Down in the dirt, there’s a soil moisture sensor that’s polling every 30 minutes. If the moisture level falls below the threshold set appropriately at a life-sustaining 42%, the Arduino is triggered to water the plant through a relay board using the espresso machine’s original pump. If the plant is dry, the machine will pump water for two seconds every minute until the threshold is met. [The Plant Bot] tied it all together with a nice web interface that shows plant data and allows for changes over Bluetooth.

[The Plant Bot] started by disconnecting the heating element, because plants don’t tend to like hot steam. But if the cup warming tray along the top has a separate heating element, it might be neat to reuse it for something like growing mushrooms, or maintaining a sourdough starter if the temperature is right.

Via r/duino

The Quest To Find A Second Life For Electric Vehicle Batteries

Rechargeable lithium chemistry battery cells found their mass market foothold in the field of personal electronics. The technology has since matured enough to be scaled up (in both physical size and production volume) to electric cars, making long range EVs far more economical than what was possible using earlier batteries. Would the new economics also make battery reuse a profitable business? Eric Lundgren is one of those willing to make a run at it, and [Gizmodo] took a look at his latest venture.

This man is a serial entrepreneur, though his previous business idea was not successful as it involved “reusing” trademarks that were not his to use. Fortunately this new business BigBattery appears to be on far more solid legal footing, disassembling battery packs from retired electric vehicles and repacking cells for other purposes. Typically EV batteries are deemed “worn out” when their capacity drops below a certain percentage (70% is a common bar) but that reduced capacity could still be useful outside of an EV. And when battery packs are retired due to problems elsewhere in the car, or just suffering from a few bad cells, it’s possible to extract units in far better shape.

We’ve been interested in how to make the best use of rechargeable lithium batteries. Ranging from tech notes helping battery reuse, to a comparison of different types, to looking at how their end-of-life recycling will be different from lead-acid batteries. Not to mention countless project wins and fails in between. A recurring theme is the volatility of mistreated or misbehaving batteries. Seeing a number of EV battery packs stacked on pallets and shelves, presumably filled with cells of undetermined quality, fills us with unease. Like the rest of California, Chatsworth is under earthquake risk, and the town was uncomfortably close to some wildfires in 2019. Eric is quick to give assurance that employees are given regular safety training and the facility conforms to all applicable workplace safety rules. But did those rules consider warehouses packed full of high capacity lithium battery cells of unknown quality? We expect that, like the business itself, standards for safety will evolve.

Concerns on safety aside, a successful business here would mean electric vehicles have indeed given battery reuse a profitable economy of scale that tiny little cell phone and laptop batteries could not reach. We are optimistic that Eric and other like-minded people pursuing similar goals can evolve this concept into a bright spot in our otherwise woeful state of e-waste handling.

From Fail To Wail: Guitar Picks Made From 3D Printed Waste

Between failed prints and iterative designs that need a few attempts before you nail them down, a certain amount of wasted material is essentially unavoidable when 3D printing. The good news is that PLA is a bioplastic and can be broken down via industrial composting, but even still, any method that allows you to reuse this material at home is worth taking a look at.

In a recent video, [Noah Zeck] details one potential use for your scrap plastic by turning his failed 3D prints into guitar picks. The idea here could really be applied to anything you can make out of thin plastic sheeting, but the fact that you can easily and cheaply produce picks with a commercially available punch makes this application particularly appealing.

The first step in this process is about as low-tech as it gets: wrap your scrap printed parts in rags, and beat them with a sledge hammer. This breaks them up into smaller and more manageable pieces, which is important for the next step. If the parts are small enough and you’ve got a decently powerful blender you don’t mind devoting to plastic recycling, we imagine that would make short work of this step as well.

Once suitably pulverized, [Noah] puts the plastic on a piece of glass and gets it warmed up with a heat gun. PLA has a fairly low glass transition temperature, so it shouldn’t take much time to soften. Then he puts a second piece of glass on top and squeezes them together to get a thin, flat sheet of plastic. Once cooled, he punches his guitar picks out of the sheet, with bonus points if the colors swirled around into interesting patterns. If you’re not musically inclined, we’ve seen a very similar method used to produce colorful floor tiles.

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