Navigation Thing: Four Days, Three Problems, and Fake Piezos

The Navigation Thing was designed and built by [Jan Mrázek] as part of a night game activity for high school students during week-long seminar. A night-time path through a forest had stations with simple tasks, and the Navigation Thing used GPS, digital compass, a beeper, and a ring of RGB LEDs to provide a bit of “Wow factor” while guiding a group of students from one station to the next. The devices had a clear design direction:

“I wanted to build a device which a participant would find, insert batteries, and follow the beeping to find the next stop. Imagine the strong feeling of straying in the middle of the night in an unknown terrain far away from civilization trusting only a beeping thing you found. That was the feeling I wanted to achieve.”

The Navigation Things (there are six in total) guide users to fixed waypoints with GPS, a digital compass, and a ring of WS2812 LEDs — but the primary means of feedback to the user is a beeping that gets faster as you approach the destination. [Jan] had only four days to make all six units, which was doable. But as most of us know, delivering on a tight deadline is often less about doing the work you know about, and more about effectively handling the unexpected obstacles that inevitably pop up in the process.

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We Declare The Grandmaster Of Pokemon Go GPS Cheats

Since Pokemon Go blew up the world a couple of weeks ago we’ve been trying to catch ’em all. Not the Pokemon; we’ve been trying to collect all the hardware hacks, and in particular the most complete GPS spoofing hack. We are now ready to declare the first Grandmaster GPS spoofing hack for Pokemon Go. It broadcasts fake GPS signals to your phone allowing the player to “walk around” the real world using a gaming joystick.

Just about everything about this looks right to us. They’re transmitting radio signals and are doing the responsible thing by using an RF shield box that includes a GPS antenna. Hardware setup means popping the phone inside and hooking up the signal generator and GPS evaluation hardware. Google Earth then becomes the navigation interface — a joystick allows for live player movements, coordinates are converted to GPS signals which are transmitted inside of the box.

Now, we did say “just about right”. First off, that RF shielding box isn’t going to stop your fake GPS signals when you leave the lid open (done so they can get at the phone’s touchscreen). That can probably be forgiven for the prototype version, but it’s that accelerometer data that is a bigger question mark.

When we looked at the previous SDR-based RF spoofing and the Xcode GPS cheats for Pokemon Go there were a number of people leaving comments that Niantic, the devs responsible for Pokemon Go, will eventually realize you’re cheating because accelerometer data doesn’t match up to the amount of GPS movement going on. What do you think? Is this app sophisticated enough to pick up on this type of RF hacking?

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Pokemon Go Cheat Fools GPS with Software Defined Radio

Using Xcode to spoof GPS locations in Pokemon Go (like we saw this morning) isn’t that much of a hack, and frankly, it’s not even a legit GPS spoof. After all, it’s not like we’re using an SDR to spoof the physical GPS signal to cheat Pokemon Go.

To [Stefan Kiese], this isn’t much more than an exercise. He’s not even playing Pokemon Go. To squeeze a usable GPS signal out of his HackRF One, a $300 Software Defined Radio, [Stefan] uses an external precision clock. This makes up for the insufficient calibration of the HackRF’s internal clock, although he points out that this might also be fixed entirely in software.

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Analog Guts Display GPS Velocity in this Hybrid Speedometer

A digital dash is cool and all, but analog gauges have lasting appeal. There’s something about the simplicity of a purely mechanical gauge connected directly to a vehicle’s transmission. Of course that’s not what’s hapenning here. Instead, this build is an analog display for GPS-acquired speed data.

The video below does a good job at explaining the basics of [Grant Stephens]’ build. The display itself is a gutted marine speedometer fitted with the movement from a motorcycle tachometer. The tach was designed to take a 4-volt peak-to-peak square wave input signal, the frequency of which is proportional to engine speed. To display road speed, [Grant] stuffed an ATTiny85 with a GPS module into the gauge and cooked up a script to convert the GPS velocity data into a square wave. There’s obviously some latency, and the gauge doesn’t appear to register low speeds very well, but all in all it seems to match up well to the stock speedo once you convert to metric.

There’s plenty of room for improvement, but we can see other applications where an analog representation of GPS data could be useful. And analog gauges are just plain fun to digitize – like these old meters and gauges used to display web-scraped weather data.

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Doc Brown’s Security Briefcase Needs Speed

If you just wait around long enough, the future becomes the past. And that’s happened to the “Back to the Future” future, as you probably all remember. But BttF-themed projects are still pouring in.

[ossum] sent us the link for his build of Doc Brown’s briefcase that only opens above 88 mph. His writeup is fantastically detailed, and worth a look if you’re interested in working with a GPS unit and microcontrollers, driving seven-segment LEDs with shift registers, or just driving too fast in an old Jetta. And there’s a video demo just below the break if you’re not a believer.

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Hackaday Dictionary: The Global Positioning System (GPS)

One of the fundamental technologies of modern gadgets is the Global Positioning System (GPS). Using signals from satellites orbiting the earth, a GPS receiver can pin down its location with remarkable accuracy: the latest generation of Civilian Navigation Signals (CNAV) sent by the US GPS system has an accuracy of less than half a meter (about 3 feet). These signals also contain the time, accurate to within milliseconds, which makes it perfect for off-line dataloggers and systems that require very accurate timing. That’s a powerful combination that has made GPS one of the main technologies behind the mobile revolution, because it lets gadgets know where (and when) they are.

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Show a Quadcopter Flight on Google Earth for Under Ten Bucks

[Joop Brokking] wanted to know where his quadcopter was and had been. He thought about Google Earth, but assumed it would be difficult to get the GPS data and integrate it with Google’s imagery. But he discovered it was easier than he thought. He wound up spending around $10, although if his ‘copter didn’t already have GPS, it would have been more.

Hardware-wise, [Joop] made a pretty straightforward data logger using a small Arduino (a Pro Mini) and an SD Card (along with an SD breakout board). With this setup, NMEA data from the GPS comes in the Arduino’s serial port and winds up on the SD Card.

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