Over the last semester, Cornell student [Ope Oladipo] had the chance to combine two of his passions: engineering and photography. He and teammates [Sacheth Hegde] and [Jason Zhang] used their time in [Bruce Land]’s class to build a motorized camera dolly for shooting time-lapse sequences.
The camera, in this case the one from an iPhone 6, is mounted to an off-the-shelf robot chassis that tools around on a pair of DC motors. The camera mount uses a stepper motor to get just the right shot. A PIC32 on board the ‘bot takes Bluetooth commands from an iOS app that the team built. The dolly works two ways: it can be controlled manually in free mode, or it can follow a predetermined path at a set speed for a specified time in programmed mode.
Our favorite part of the build? The camera’s view is fed to a smart watch where [Ope] and his team can take still pictures using the watch-side interface. Check it out after the break, and stick around for a short time-lapse demo. We’ve featured a couple of dolly builds over the years. Here’s a more traditional dolly that rides a pair of malleable tubes.
Continue reading “Motorized Camera Dolly Rolls With the Changes”
When you want to play around with a new technology, do you jump straight to production machinery? Nope. Nothing beats a simplified model as proof of concept. And the only thing better than a good proof of concept is an amusing proof of concept. In that spirit [Eric Tsai], alias [electronichamsters], built the world’s most complicated electronic gingerbread house this Christmas, because a home-automated gingerbread house is still simpler than a home-automated home.
Yeah, there are blinky lights and it’s all controlled by his smartphone. That’s just the basics. The crux of the demo, however, is the Bluetooth-to-MQTT gateway that he built along the way. A Raspberry Pi with a BTLE radio receives local data from BTLE sensors and pushes them off to an MQTT server, where they can in principle be read from anywhere in the world. If you’ve tried to network battery-powered ESP8266 nodes, you know that battery life is the Achilles heel. Swapping over to BTLE for the radio layer makes a lot of sense.
Continue reading “Raspberry Pi Home Automation for the Holidays”
Fast-forward to the end of the talk, and you’ll hear someone in the audience ask [Ray] “Are there any Bluetooth locks that you can recommend?” and he gets to answer “nope, not really.” (If this counts as a spoiler for a talk about the security of three IoT locks at a hacker conference, you need to get out more.)
Unlocking a padlock with your cellphone isn’t as crazy as it sounds. The promise of Internet-enabled locks is that they can allow people one-time use or limited access to physical spaces, as easily as sending them an e-mail. Unfortunately, it also opens up additional attack surfaces. Lock making goes from being a skill that involves clever mechanical design and metallurgy, to encryption and secure protocols.
In this fun talk, [Ray] looks at three “IoT” locks. One, he throws out on mechanical grounds once he’s gotten it open — it’s a $100 lock that’s as easily shimmable as that $4 padlock on your gym locker. The other, a Master lock, has a new version of a 2012 vulnerability that [Ray] pointed out to Master: if you move a magnet around the outside the lock, it actuates the motor within, unlocking it. The third, made by Kickstarter company Noke, was at least physically secure, but fell prey to an insecure key exchange protocol.
Along the way, you’ll get some advice on how to quickly and easily audit your own IoT devices. That’s worth the price of admission even if you like your keys made out of metal instead of bits. And one of the more refreshing points, given the hype of some IoT security talks these days, was the nuanced approach that [Ray] took toward what counts as a security problem because it’s exploitable by someone else, rather than vectors that are only “exploitable” by the device’s owner. We like to think of those as customization options.
Finding a product that is everything you want isn’t always possible. Making your own that checks off all those boxes can be. [Peter Clough] took the latter route and built a small Bluetooth speaker with an LED visualization display that he calls Magic Box.
A beefy 20W, 4Ohm speaker was screwed to the lid of a wooden box converted to the purpose. [Clough] cut a clear plastic sheet to the dimensions of the box, notching it 2cm from the edge to glue what would become the sound reactive neopixel strip into place — made possible by an electret microphone amplifier. There ended up being plenty of room inside the speaker box to cram an Arduino Pro Mini 3.3V, the RN-52 Bluetooth receiver, and the rest of the components, with an aux cable running out the base of the speaker. As a neat touch, neodymium magnets hold the lid closed.
Continue reading “Bluetooth Speaker With Neopixel Visual Display!”
Last week, the latest and greatest member of the Bluetooth family of wireless specifications was announced to the world: Bluetooth 5! What main changes are in store? Read the FAQ (PDF), or dig into the full spec (bigger PDF) at 2,800 pages.
Their big-print selling points include “up to 4x the range, 2x the speed, and 8x the broadcasting message capacity” to power the Internet of Things. Etcetera. [Akiba] pointed out via Twitter that they get the fourfold increase in range by adding an extra zero to the “Maximum Output Power” spec, going from 10 mW maximum power to 100 mW. That would do it.
In less snarky news, they’re also allowing for a lower-bitrate mode that will also increase range without simply boosting the power. The spec is actually being changed to let the user work out their optimal blend of power, range, and bitrate. We’re down with that. But you’re not getting 4x the range and 2x the speed without paying the bandwidth piper. That’s just physics.
If you use the beacon mode in Bluetooth Low Energy (BLE), you’ll be happy to hear that they’re lengthening the beacon packet from 31 bytes to 255, so you can send a bunch more data without consuming too much power. That’s the “8x”. Bluetooth 5.0 is also backwards compatible with Bluetooth 4.2, so you don’t have to redo anything if you don’t want to take advantage of the newer features. Your current BLE beacons will keep working.
Finally, there’s some contention-detection and other bandwidth optimizing going on, which is welcome in our crowded 2.4 GHz office spectrum. Our guess is that’s where the “2x speed” is largely coming from, but there are about 2,750 pages that we haven’t read yet, so if you’re digging into the spec, let us know what you find in the comments.
Thanks to [Akiba] for tipping us off to this via Twitter. Go check out his great talk on getting hacker stuff in Shenzhen that was presented at the SuperCon.
There’s an iconic scene from the movie Big where [Tom Hanks] and [Robert Loggia] play an enormous piano by dancing around on the floor-mounted keys. That was the first thing we thought of when we saw [jegatheesan.soundarapandian’s] PC joystick rug. His drum playing (see the video below) wasn’t as melodious as [Hanks] and [Loggia] but then again they probably had a musical director.
At the heart of the project is, of course, an Arduino. An HC-05 provides a Bluetooth connection back to the PC. We thought perhaps an Arduino with USB input capability like the Leonardo might be in use, but instead, [jegatheesan] has a custom Visual Basic program on the PC that uses SendKeys to do the dirty work.
The switches are more interesting made with old CDs, foil, and sponges. The sponge holds the CDs apart until you step on them and the foil makes the CDs conductive. He uses a lot of Fevicol in the project–as far as we can tell, that’s just an Indian brand of PVA glue, so Elmer’s or any other white glue should do just as well.
Continue reading “Game Controller Cuts the Rug”
Your eyes are cool, but they aren’t very loud. You can remedy that with this build from [Sam Freeman]: a pair of Bluetooth speaker goggles. Combine a pair of old welders goggles with a Bluetooth receiver, a small amp and a couple of cheap speaker drivers and you’re well on your way to securing your own jet set radio future.
[Sam] found a set of speaker drivers that were the same size as the lenses of the goggles, as if they were designed for each other. They don’t do much for your vision, but they definitely look cool. [Sam] found that he could run the speakers for an hour or so from a small Lithium Ion battery that’s hidden inside the goggles, along with a large lever switch for that throwback electronics feel. The total cost of this build is a reasonably-low at $40, or less if you use bits from your junk pile.
The real trick is watching them in action and deciding if there’s any motion happening. Don’t get us wrong, they look spectacular but don’t have the visual feedback component of, say, the bass cannon. Look for yourself in the clip below. We might add a pair of googly eyes on the speakers that dance as they move, but that would get away from the more serious Robopunk look that [Sam] is going for. What would you add to build up the aesthetic of these already iconic goggles?
Continue reading “Make Your Eyes Louder With Bluetooth Speaker Goggles”