Giving Solar Power’s Mortal Enemies A Dusting Without Wasting Water

A prerequisite for photovoltaic (PV) and concentrated solar power (CSP) technologies to work efficiently is as direct an exposure to the electromagnetic radiation from the sun as possible. Since dust and similar particulates are excellent at blocking the parts of the EM spectrum that determine their efficiency, keeping the panels and mirrors free from the build-up of dust, lichen, bird droppings and other perks of planetary life is a daily task for solar farm operators. Generally cleaning the panels and mirrors involves having trucks drive around with a large water tank to pressure wash the dirt off, but the use of so much water is problematic in many regions.

Keeping PV panels clean is also a consideration on other planets than Earth. So far multiple Mars rovers and landers have found their demise at the hands of Martian dust after a layer covered their PV panels, and Moon dust (lunar regolith) is little better. Despite repeated suggestions by the peanut gallery to install wipers, blowers or similar dust removal techniques, keeping particulates from sticking to a surface is not as easy an engineering challenge as it may seem, even before considering details such as the scaling issues between a singular robot on Mars versus millions of panels and mirrors on Earth.

There has been research into the use of the electrostatic effect to repel dust, but is there a method that can keep both solar-powered robots on Mars and solar farms on Earth clean and sparkling, rather than soiled and dark?

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Polaroid Develops Its Pictures Remotely

For those who didn’t experience it, it’s difficult to overstate the cultural impact of the Polaroid camera. In an era where instant gratification is ubiquitous, it’s easy to forget that there was a time when capturing a photograph meant waiting for film to be developed or relying on the meticulous art of darkroom processing. Before the era of digital photography, there was nothing as close to instant as the Polaroid. [Max] is attempting to re-capture that feeling with a modified Polaroid which instantly develops its pictures in a remote picture frame.

The build is based on a real, albeit non-functional, Polaroid Land Camera. Instead of restoring it, a Raspberry Pi with a camera module is placed inside the camera body and set up to capture pictures. The camera needs to connect to a Wi-Fi network before it can send its pictures out, though, and it does this automatically when taking a picture of a QR code. When a picture is snapped, it sends it out over the Internet to wherever the picture frame is located, which has another Raspberry Pi inside connected to an e-ink screen. Once a picture is taken on the camera it immediately shows up in the picture frame.

To help preserve the spirit of the original Polaroid, at no point is an image saved permanently. Once it is sent to the frame, it is deleted from the camera, and the next picture taken overwrites the last. And, for those who are only familiar with grayscale e-ink displays as the integral parts of e-readers, there have been limited options for color displays for a while now, as we saw in this similar build which was painstakingly built into a normal-looking picture frame as part of an attempted family prank.

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Building A Peltier-Powered Cloud Chamber

If you’ve been watching Oppenheimer and it’s gotten you all excited about the idea of radioactive decay, you might want to visualize it. A cloud chamber is the perfect way to do that, and [NuclearPhoenix] is here to show us just how to build one.

The build relies on a Peltier device to cool a 10 cm square copper plate down to temperatures as low as -30 °C (-22 °F). Isopropyl alcohol is evaporated via warming resistors within the cloud chamber, and then condenses in the cooled area, creating a thin layer of fog. Ionizing radiation that passes through the chamber can then be spotted by the the trails it leaves through the fog. It’s even possible to identify the type of radiation passing through by the type of trail it leaves. Alpha particles leave shorter traces, while more energetic beta particles which are difficult to stop tend to streak further.

It bears noting that if you see a ton of activity in your cloud chamber at home, it might be worth making some enquiries. Some cloud chambers you’ll see in museums and the like use a small radioactive source to generate some excitement for viewers, though. Video after the break.

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Vintage Artificial Horizon Is Beautiful In Motion

Attitude indicators are super useful if you’re flying a plane, particularly in foggy conditions or over water. They help you figure out which way the plane is pointing relative to the unforgiving ground below. [Hack Modular] has been toying with a few, and even figured out how to get them powered up!

The attitude indicators use spinning gyroscopes to present a stable artificial horizon when a plane is in motion. Airworthy models are highly expensive, but [Hack Modular] was experimenting with some battered surplus examples. He sets about opening the delicate gauges, noting the seals and other features intended to protect the equipment inside. We get a great look at the gimbals and the reset mechanism used to zero out the device. He then pulls a classic mechanic’s trick, robbing a few screws from Peter to reassemble Paul.

We wouldn’t trust the gauges for flight duty, but they look great when powered up, all lit and spinning. They have the beautiful vintage glow that you only get from filament bulbs and deftly painted instrumentation. While avionics don’t come cheap off the shelf, it’s worth tinkering with cheap older gear if you can find it. The engineering involved, even in older equipment, is truly impressive. Video after the break.

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Dielectric Mirror Shines Bright

We knew the mirrors in our house were not really very good mirrors, optically speaking. Your mirror eats up 20 to 40 percent of the light that hits it. High-quality first-surface mirrors are better, but [Action Lab] has a video (see below) of something really different: a polymer dielectric mirror with 99.5% reflectivity. In addition, it has no Brewster angle — light that hits it from any angle will reflect.

Turns out something that thin and reflective can be hard to find. It also makes a little flashlight if you roll a tube of the material and pinch the back end together. The light that would have exited the rear of the tube now bounces around until it exits from the front, making it noticeably bright. The film comes from 3M, and apparently, they were surprised about the optical properties, too.

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2023 Cyberdeck Challenge: A Ham Radio Cyberdeck

Cyberdecks rock because their homebrewed nature lets them feature all kinds of nifty additional functionality. [Kaushlesh] has built his deck with an eye to ham radio use, and it’s a rugged and impressive thing.

The deck is built into a weatherproof enclosure, with various 3D-printed parts helping to integrate the components into the clamshell enclosure. It runs on a Raspberry Pi 4, with [Kaushlesh] springing for the hefty model with 8GB of RAM. It has a 10-inch LCD screen and a rechargable battery pack with an impressive 20 hour battery life, and is intended for use when [Kaushlesh] is out camping or participating in ham radio field days. To that end, it’s equipped with a USB software-defined radio module and a BNC connector for hooking up an external antenna. It also has a game controller that mounts inside, just in case he desires playing a few games on Retropie while he’s out and about. It’s even got storage for a mouse and rocks a decent-sized keyboard inside.

We’d love to tote this to a hamfest for a bit of hacking on the side. It’s not the first ham-themed cyberdeck we’ve seen, either. Now we just need one built for prosciutto. Video after the break.

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Hackaday Prize 2023: PAROL6 – A GPL Desktop Robotic Arm

Parol 6 is a 3D-printed six-axis robot arm created by [Petar Crnjak] as a combination of the principles from a few previous projects. Aside from a pneumatic gripper, each axis is driven by a stepper motor, with at least a few of these axes being driven through a metal planetary gearbox for extra precision and torque.

From what we can glean from the work-in-progress documentation, there are some belt drives on four of the relevant axes and a mix of NEMA17 format steppers driving either 20:1 or 10:1 reduction boxes. There appears to be a mix of inductive sensors and traditional microswitches used, but it’s not so easy to work out where these are placed. Continue reading “Hackaday Prize 2023: PAROL6 – A GPL Desktop Robotic Arm”