A few months ago Hackaday covered the xNT crowdfunding campaign which aimed at making an NTAG216 based NFC implant for different purposes. I actually backed it, found that standard NFC readers don’t perform well and therefore decided to try using a standard coil as an antenna for better reading performances.
Most NFC readers typically only have a small sweet spot where implant reading is possible. This is due to what we call coupling factor which depends on the reading distance and reader & NFC tag antenna geometries. Having a smaller antenna diameter increases the coupling factor and makes implant positioning easier.
In my detailed write-up you’ll find a good introduction to impedance matching, a process where a few passive components are added in series/parallel with an antenna to bring its complex impedance close to a RF signal transmitter’s. This usually requires expensive tools but allows optimal power transmission at a given frequency.
You may find our xNT coverage here.
Next time you’re strutting down the block with that hi-fi on you shoulder, don’t subject yourself to the limitations of a radio station’s tight playlist or the short run time of a cassette tape. Pack your tunes on your wrist and beam them directly with this wearable FM transmitter. No wires… it’s like the future is now!
The Raspberry Pi has proven itself to be a dependable FM transmitter. This project follows in those footsteps but moves the goal line a few leaps further. The build has a full user interface which will make it easy to adapt to just about any application you can imagine. And the added twist is shown in the latter third of the video after the break. [Navic209] has included a microphone in the design which allows the wearer to transmit voice to an appropriately tuned radio. It gives the device a very Dick Tracey-esque feel.
Continue reading “Feed That Shoulder Boom Box with a Wrist Tune Transmitter”
In June of 2014, [Afrdt] spent two weeks on a boat as an artist-in-residence in Linz, Austria. During that time, she created a dress that detects EMF waves and outputs them to vibration motors and a headphone jack.
[Afrdt] started by making two EMF coil antennas and sewed them to cuffs that snap together. She crafted fashionable fabric stripes that both conceal and carry the cables from the coils to an Adafruit FLORA that’s sewn into the body of the dress. The wearer experiences haptic feedback via vibration motors in the chest, and sonic feedback from a mini female headphone jack built into the collar. The zipper functions as a low-pass filter and volume control for the jack. One side bears resistive tape and runs to the FLORA, which is programmed to play an 800Hz tone. The other side runs to the headphone jack via conductive thread. As the zipper is opened, the pitch increases to toward the maximum pitch of 880Hz.
She drew inspiration for this project from [Aaron Alai]’s EMF detector project and built the code on top of it. Broader documentation and many more pictures are available both at [Afrdt]’s site and the residency program’s site.
This project is an official entry to The Hackaday Prize that sadly didn’t make the quarterfinal selection. It’s still a great project, and worthy of a Hackaday post on its own.
[Greg’s] been playing around with wearable hacks for quite some time now, and he’s decided to add a new twist for his latest LED light suit (Mk 4) — An ancient NES Power Glove to control it.
He was inspired by the band Hypercrush who had a music video where one of the guys was wearing a laser-shooting power glove — awesome. Having already made light suits before, he thought it’d be fun to do something similar.
The suit is controlled by an Arduino Pro Mini which has been hacked into the Power Glove for ultimate button pushing capabilities. He’s using 5 meter LED strips of the classic WS2812 RGB variety, which allow for individual LEDs to be addressed using a single pin. It’s powered by a 5V 2A USB battery pack, and he’s made all the components very modular, you could even say it’s “plug and play”!
Continue reading “Prototype LED Light Suit runs off of a NES Power Glove”
There are three types of booths at Maker Faire. The first is the strange corporate booth, like Pepsi ‘revolutionizing fluid intake’ or some such nonsense. That one had the longest line of any booth, in case you’re wondering. The second type of booth is the people you would expect to be there – Atmel, TI, and Makerbot all came out in full force.
The third type of booth were a little hard to find. They’re the ‘show and tell’ spirit of Maker Faire, and [Stephen Hawes] was one of the best. Why? Wrist-mounted flamethrower, that’s why.
The flamethrower is fueled with a propane bottle originally meant for a camping stove, with a microcontroller and pot setup taking care of the height of the flame. Buttons underneath [Stephen]’s thumb takes care of the propane flow and
tazer-based ignitor. The wrist measurement sensor can rescale to adjust the height of the flame to how far the wearer can move their wrist.
All in all, a great project for the Faire, although we did feel a little sorry for the NYC fire marshal that was assigned to [Stephen] for the entire faire. As an aside, we’re applauding [Stephen] for not referencing whatever comic book character has fire shooting out of his hand.
The Hackaday Prize has had a few medical devices make the semifinalist cut, and of course wearables are on the list. How about implantables? That’s what Bionic Yourself 2.0 (or B10N1C) is doing with an implantable microcontroller, battery, and sensor system.
The hardware in B10N1C includes a electromyography sensor for measuring muscle activity, an accelerometer, a vibration motor, RFID reader/writer, temperature sensor, and – get this – a LED bar graph that will shine a light through the skin. That’s something we’ve never seen before, and if you’re becoming a cyborg, it’s a nice feature to have.
As with anything you would implant in your body, safety is a prime consideration for Bionic.the Lithium battery can be overcharged (yes, through a wireless charging setup) to 10V without a risk of fire or explosion, can be hit with a hammer, and can even be punctured. The enclosure is medical grade silicone, the contacts are medical grade stainless steel, and there’s a humidity sensor inside that will radio a message saying its time to remove the device if the moisture level in the enclosure increases.
Because the device is implanted under the skin, being able to recharge and update the code without a physical connection is the name of the game. There’s a coil for wireless charging, and a lot of work is going into over the air firmware updating. It’s an astonishing project, and while most people probably won’t opt for a cyborg implant, it will look really cool.
The project featured in this post is a quarterfinalist in The Hackaday Prize.
While there is lots of hype about a big company launching a new wearable product, we’re more interested in [Walltech]’s open source OLED Smartwatch. This entry into The Hackaday Prize merges a collection of sensors and an OLED screen into a wearable device that talks to your smartphone over Bluetooth Low Energy.
The device is based on the IMUduino BTLE development board. This tiny Arduino clone packs an inertial measurement unit (IMU), a Nordic nRF8001 Bluetooth radio, and an ATMEGA32u4 microcontroller.
The 1.5″ OLED display comes from [miker] who makes an OLED module based on the SSD1351. A STP200M 3D pedometer provides activity monitoring in a tiny package.
On the hardware side, packaging all these components into something that will fit on your wrist is quite difficult. The prototype hardware is built from mostly off the shelf components, but still manages to be watch sized.
At this point, it looks like the code is the main challenge remaining. There’s a lot of functionality that could be implemented, and [Walltech] even mentions that it’s designed to be very customizable. It even supports Android; the Apple Watch can’t do that.
The project featured in this post is a quarterfinalist in The Hackaday Prize.