Solar

A Solar-Powered Headset From Recycled Parts

Hackaday Solar Hacks -

Solar power has surged ahead in recent years, and access for the individual has grown accordingly. Not waiting around for a commercial alternative, Instructables user [taifur] has gone ahead and built himself a solar-powered Bluetooth headset.

Made almost completely of recycled components — reducing e-waste helps us all — only the 1 W flexible solar panel, voltage regulator, and the RN-52 Bluetooth module were purchased for this project. The base of the headset has been converted from [taifur]’s old wired one, meanwhile a salvaged boost converter, and charge controller — for a lithium-ion battery — form the power circuit. An Apple button makes an appearance alongside a control panel for a portable DVD player (of all things), and an MP4 player’s battery. Some careful recovery and reconfiguration work done, reassembly with a little assistance from the handyman’s secret weapon — duct tape — and gobs of hot glue bore a wireless fruit ready to receive the sun’s bounty.

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Taking the initiative to go green using solar power– taken literally — could also result in getting into hydroponic gardening.


Filed under: hardware, how-to, portable audio hacks, solar hacks

Solar Controller Reverse Engineered In Both Directions

Hackaday Solar Hacks -

[Jared Sanson] has a solar power setup on his beach house, consisting of 6 panels and a 24V battery bank, supplied by Outback Inc. Their chargers and inverters pair over a seemingly proprietary connection with a controller known as the MATE. The MATE has a standard serial output which gives some details about the operation, but [Jared] wasn’t getting the detailed information they could get from the controller’s screen. This meant it was time to reverse engineer the proprietary connection instead, which [Jared] calls MateNET.

The controller interfaces with the chargers over a Cat5 cable. [Jared] initially suspected RS-485, but it turned out to be regular serial at 0-24V logic levels, at 9600 baud, 9n1. To figure out the pinout, [Jared] went through the MATE circuitry with a fine-toothed comb, discovering an ATMEGA32. Since both the MATE’s user output & its connection to the other equipment are both serial, a logic mux is used to split the ATMEGA32’s single UART between the two serial connections. With the physical layer sorted, it was time to figure out how the protocol worked.

The first step was to capture some packets from the running system, with the MATE connected to an MX charge controller. There was some difficulty in that the MateNET system uses the 9th bit to indicate the start of packets – [Jared]’s PC sniffing setup ignored this as a parity bit. By matching the contents of the captured packets with what was displayed on the screen, it was possible to determine fields containing status, battery voltage, and solar panel voltage. The rest of the packet wasn’t easily understood, however, and [Jared] decided to change tack.

Using Python to emulate the MX charge controller, packets were sent to the MATE with varying contents, and the screen monitored for changes. This spoofing approach made the contents of the packets much easier to determine. It was important to note the checksum used in the packets to make sure the MATE considered the data valid. [Jared] went further, trying to spoof other hardware with his Python code. The MATE helped out, indicating when packets from different hardware were shorter than expected, or otherwise malformed, helping them to guess the proper format. This work all got wrapped up into pymate, a Python emulator of a MATE controller.

With the protocol figured out, it was time to wrap the project up. Running pymate on a Carambola2 Linux board, the packets get processed and eventually stored in a PostgresSQL database on a remote server. Combining this with the stunning Grafana open-source graphing library allows [Jared] to view his system’s status with some very pretty graphical aids, by way of a Github fork that allows the library to grok SQL.

It’s a tidy project with a very professional-looking end product and allows [Jared] to easily monitor his solar setup remotely. Power monitoring hacks are very popular – we’ve even seen it done with webcams monitoring power meters with Python.


Filed under: solar hacks

Get Ready for the Great Eclipse of 2017

Hackaday Solar Hacks -

On August 21, 2017, the moon will cast its shadow across most of North America, with a narrow path of totality tracing from Oregon to South Carolina. Tens of millions of people will have a chance to see something that the continental US hasn’t seen in ages — a total eclipse of the sun. Will you be ready?

The last time a total solar eclipse visited a significantly populated section of the US was in March of 1970. I remember it well as a four-year-old standing on the sidewalk in front of my house, all worked up about space already in those heady days of the Apollo program, gazing through smoked glass as the moon blotted out the sun for a few minutes. Just watching it was exhilarating, and being able to see it again and capitalize on a lifetime of geekiness to heighten the experience, and to be able to share it with my wife and kids, is exciting beyond words. But I’ve only got eight months to lay my plans!

Where and When

First, the basics. Totality will cross the Pacific coast at 17:15 UTC just north of Depoe Bay, Oregon. It will proceed across southern Idaho into Wyoming – Grand Teton and Yellowstone visitors will have quite a treat – then Nebraska, a tiny corner of Kansas, Missouri, small slivers of Illinois and Kentucky, across Tennessee and a fraction of North Carolina, finally heading out to sea between Charleston and Myrtle Beach, South Carolina at 18:49 UTC. Need to see how close you are to totality and when you can expect the eclipse to start? NASA has put together a handy interactive Google Map for just that purpose.

 NASA eclipse web siteThe Eclipse of 2015. Source: NASA eclipse web site

Your first task is to decide where you’re going to watch events unfold. Assuming you want to witness totality, quite a few major cities are in or very near the path – Salem, Oregon; Boise, Idaho; Lincoln, Nebraska; Kansas City and St. Louis; and Nashville, Tennessee. Viewing opportunities will abound in and around these cities, so it won’t be much of a chore to step outside at the appointed hour. However, I’ve heard that the sight of the moon’s shadow racing across the land is especially exciting if you can get somewhere elevated. So on the 21st you’ll find me sitting on the top of Menan Butte outside of Rexburg, Idaho, watching the shadow approach across the plains to the west.

It’s worth noting that the path of totality east of the Mississippi is within a reasonable day’s drive of about half the population of the United States. If you need to travel to get to totality, you’ll need to think ahead, because you’re going to be competing with a lot of other eclipse watchers in addition to the usual summer travelers. Destination locations, like national parks and major resort areas, are likely to be booked. In fact, it may be too late already — I can’t find a hotel room in Idaho Falls for that weekend to save my life. Looks like we’ll be camping by the side of the road.

How to Observe  Sky and TelescopeEclipse glasses are a must. Source: Sky and Telescope

Once you decide where to be and make the appropriate sacrifices to the weather deity of your choice for clear skies, what are you going to do? Most people will be content with just watching, but no matter where you go there are likely to be a ton of people and a party atmosphere, so be prepared to be sociable.

For direct viewing before totality, you’ll want to think about eye safety. At more populated viewing sites, vendors will no doubt be doing a brisk business selling eclipse glasses at incredible markups, so you might want to order yours ahead, and maybe have a few extras to share with unprepared watchers. A shade 14 welding helmet filter will also do the trick, as will fully exposed and developed black and white photo film, as long as it’s a silver-based film. Pinhole cameras are a good choice too, but you’ll need at least a meter focal length to project a decent image. If you don’t feel like toting a refrigerator box around, projecting the image from a telescope or binoculars onto a screen is a good way to go too.

And don’t forget to bring a flashlight – it’ll be as dark as night for the few minutes that it takes for the moon’s shadow to pass.

Eclipses Aren’t Just for Watching

Hackers and space geeks might not be content to just watch, of course. Personally, I’ll be tending an array of cameras to capture the event, as I suspect many others will. Many ham radio operators will be trying to use daytime ionospheric skip to work long-distance contacts during the eclipse, and there are some coordinated efforts to conduct experiments during the eclipse. Others with a scientific bent and the right resources might choose to replicate Sir Arthur Eddington’s confirmation of Einstein’s General Relativity during a 1919 solar eclipse; the bright star Regulus in the constellation Leo will be close enough to the sun to allow measurement of the gravitational lensing Einstein predicted. And you might even be able to get funding for public outreach efforts to enhance the viewing experience.

No matter how you choose to spend Eclipse Day 2017, enjoy it. If you do happen to miss it, don’t worry — the US gets treated to another total eclipse in 2024.

And if you happen to find yourself on Menan Butte outside of Rexburg, Idaho, come on over and say hi.


Filed under: Current Events, Featured, news, Original Art, solar hacks
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