gps

333 Articles

Tiny LoRa GPS Node Relies On ESP32

October 17, 2024 by 10 Comments

Sometimes you need to create a satellite navigation tracking device that communicates via a low-power mesh network. [Powerfeatherdev] was in just that situation, and they whipped up a particularly compact solution to do the job.

As you might have guessed based on the name of its creator, this build is based around the ESP32-S3 PowerFeather board. The PowerFeather has the benefit of robust power management features, which makes it perfect for a power-sipping project that’s intended to run for a long time. It can even run on solar power and manage battery levels if so desired. The GPS and LoRa gear is all mounted on a secondary “wing” PCB that slots directly on to the PowerFeather like a Arduino shield or Raspberry Pi HAT. The whole assembly is barely larger than a AA battery.

It’s basically a super-small GPS tracker that transmits over LoRa, while being optimized for maximum run time on limited power from a small lithium-ion cell. If you’re needing to do some long-duration, low-power tracking task for a project, this might be right up your alley.

LoRa is a useful technology for radio communications, as we’ve been saying for some time. Meanwhile, if you’ve got your own nifty radio comms build, or anything in that general milleu, don’t hesitate to drop us a line!

GPS Tracking In The Trackless Land

October 7, 2024 by 17 Comments

Need a weekend project? [Cepa] wanted a GPS tracker that would send data out via LTE or the Iridium network. Ok, maybe that’s one for a very long weekend. However, the project was a success and saw service crossing the Barents Sea in the Arctic. Not bad.

Apparently, [Cepa] is very involved in sharing tracks to odd and remote places. While you may not have cell service in the middle of the Barents Sea, you can always see Iridium. The device does make some sacrifices to the expense of satellite communications. On LTE, the system pings your location every ten seconds. Without it, it dials up the sat connection once an hour. However, it does store data on a SD card, so — presumably — you get caught up when you have a connection.

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A Lightweight Balloon Tracker For High Altitude Missions

October 3, 2024 by 47 Comments

It’s pretty easy to take a balloon, fill it up with helium, and send it up in to the upper atmosphere. It’s much harder to keep track of it and recover it when it falls back to Earth. If you’re trying to do that, you might find some value in the Tiny4FSK project from the New England Weather Balloon Society.

Tiny4FSK is intended to be a very small solution for high-altitude tracking. As you might have guessed from the name, it communicates via 4FSK—four frequency shift keying. Basically, it communicates data via four separate tones. Based around the SAMD21G18A microcontroller, it’s designed to run on a single AA battery, which should last for anywhere from 10-17 hours. It communicates via a Si4063 transmitter set up to communicate on 433.2 MHz, using the Horus Binary v2 system. As for data, it’s hooked up with a GPS module and a BME280 environmental sensor for location. The balloon can figure out where it is, and tell you the temperature, pressure, and humidity up there, too.

If you’re looking for a lightweight balloon tracker, this one might be very much up your alley. We’ve featured other projects in this vein, too. Meanwhile, if you’re developing something new in the high-altitude ballooning space, you could keep it to yourself. Or, alternatively, you could tell us via the tipsline and we’ll tell everybody else. Your call!

Cyberpack Puts All The Radios Right On Your Back

September 25, 2024 by 28 Comments

A disclaimer: Not a single cable tie was harmed in the making of this backpack cyberdeck, and considering that we lost count of the number of USB cables [Bag-Builds] used to connect everything in it, that’s a minor miracle.

The onboard hardware is substantial, starting with a Lattepanda Sigma SBC, a small WiFi travel router, a Samsung SSD, a pair of seven-port USB hubs, and a quartet of Anker USB battery banks. The software defined radio (SDR) gear includes a HackRF One, an Airspy Mini, a USRP B205mini, and a Nooelec NESDR with an active antenna. There are also three USB WiFi adapters, an AX210 WiFi/Bluetooth combo adapter, a uBlox GPS receiver, and a GPS-disciplined oscillator, both with QFH antennas. There’s also a CatSniffer multi-protocol IoT dongle and a Flipper Zero for good measure, and probably a bunch of other stuff we missed. Phew!

As for mounting all this stuff, [Bag-Builds] went the distance with a nicely designed internal frame system. Much of it is 3D printed, but the basic frame and a few rails are made from aluminum. The real hack here, though, is getting the proper USB cables for each connection. The cable lengths are just right so that nothing needs to get bundled up and cable-tied. The correct selection of adapters is a thing of beauty, too, with very little interference between the cables despite some pretty tightly packed gear.

What exactly you’d do with this cyberpack, other than stay the hell away from airports, police stations, and government buildings, isn’t exactly clear. But it sure seems like you’ve got plenty of options. And yes, we’re aware that this is a commercial product for which no build files are provided, but if you’re sufficiently inspired, we’re sure you could roll your own.

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Pulling Apart An Old Satellite Truck Tracker

September 13, 2024 by 9 Comments

Sometimes there’s nothing more rewarding than pulling apart an old piece of hardware of mysterious origin. [saveitforparts] does just that, and recently came across a curious satellite system from a surplus store. What else could he do, other than tear it down and try to get it humming? 

The device appeared to be satellite communication device for a tracking unit of some sort, complete with a long, thick proprietary cable. That led to a junction box with a serial port and an RJ45 port, along with some other interfaces. Disassembly of the unit revealed it contained a great deal of smarts onboard, including some kind of single-board computer. Comms-wise, it featured a cellular GPRS interface as well as an Orbcomm satellite modem. It also packed in GPS, WiFi, Xbee, Ethernet, and serial interfaces. It ultimately turned out to be a Digi ConnectPort X5 device, used as a satellite tracking system for commercial trucks.

What’s cool is that the video doesn’t just cover pulling it apart. It also dives into communicating with the unit. [saveitforparts] was able to power it up and, using the manufacturer’s software, actually talk to the device. He even found the web interface and tested the satellite modem.

Ultimately, this is the kind of obscure industry hardware that most of us would never come into contact with during our regular lives. It’s neat when these things show up on the secondary market so hackers can pull them apart and see what makes them tick. Video after the break.

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Train Speed Signaling Adapted For Car

September 11, 2024 by 33 Comments

One major flaw of designing societies around cars is the sheer amount of signage that drivers are expected to recognize, read, and react to. It’s a highly complex system that requires constant vigilance to a relatively boring task with high stakes, which is not something humans are particularly well adapted for. Modern GPS equipment can solve a few of these attention problems, with some able to at least show the current speed limit and perhaps an ongoing information feed of the current driving conditions., Trains, on the other hand, solved a lot of these problems long ago. [Philo] and [Tris], two train aficionados, were recently able to get an old speed indicator from a train and get it working in a similar way in their own car.

The speed indicator itself came from a train on the Red Line of the T, Boston’s subway system run by the Massachusetts Bay Transportation Authority (MBTA). Trains have a few unique ways of making sure they go the correct speed for whatever track they’re on as well as avoid colliding with other trains, and this speed indicator is part of that system. [Philo] and [Tris] found out through some reverse engineering that most of the parts were off-the-shelf components, and were able to repair a few things as well as eventually power everything up. With the help of an Arduino, an I/O expander, and some transistors to handle the 28V requirement for the speed indicator, the pair set off in their car to do some real-world testing.

This did take a few tries to get right, as there were some issues with the power supply as well as some bugs to work out in order to interface with the vehicle’s OBD-II port. They also tried to use GPS for approximating speed as well, and after a few runs around Boston they were successful in getting this speed indicator working as a speedometer for their car. It’s an impressive bit of reverse engineering as well as interfacing newer technology with old. For some other bits of train technology reproduced in the modern world you might also want to look at this recreation of a train whistle.

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Misleading GPS, Philosophy Of Maps, And You

September 10, 2024 by 19 Comments

The oft-quoted saying “all models are wrong, but some are useful” is a tounge-in-cheek way of saying that at some level, tools we use to predict how the world behaves will differ from reality in some measurable way. This goes well beyond the statistics classroom it is most often quoted in, too, and is especially apparent to anyone who has used a GPS mapping device of any sort. While we might think that our technological age can save us from the approximations of maps and models, there are a number of limitations with this technology that appear in sometimes surprising ways. [Kyle] has an interesting writeup about how maps can be wrong yet still be incredibly useful especially in the modern GPS-enabled world. Continue reading “Misleading GPS, Philosophy Of Maps, And You” →