DIY Smartwatch Based On ESP8266 Needs Classification

Building your own smartwatch is a fun challenge for the DIY hobbyist. You need to downsize your electronics, work with SMD components, etch your own PCBs and eventually squeeze it all into a cool enclosure. [Igor] has built his own ESP8266-based smartwatch, and even though he calls it a wrist display – we think the result totally sells as a smartwatch.

His design is based on a PCB for a wireless display notifier he designed earlier this year. The design uses the ESP-12E module and features an OLED display, LEDs, tactile switches and an FT232R USB/UART interface. Our beloved TP4056 charging regulator takes care of the Lithium-ion cell and a voltage divider lets the ESP8266’s ADC read back the battery voltage. [Igor] makes his own PCBs using the toner transfer method, and he’s getting impressive results from his hacked laminator.

Together with a hand-made plastic front, everything fits perfectly into the rubber enclosure from a Jelly Watch. A few bits of Lua later, the watch happily connects to a WiFi network and displays its IP configuration. Why wouldn’t this be a watch? Well, it lacks the mandatory RTC, although that’s easy to make up for by polling an NTP time server once in a while. How would our readers classify this well-done DIY build? Let us know in the comments!

Stretchable Traces for Flexible Circuits

Electronic components are getting smaller and smaller, but the printed circuit boards we usually mount them on haven’t changed much. Stiff glass-epoxy boards can be a limiting factor in designing for environments where flexibility is a requirement, but a new elastic substrate with stretchable conductive traces might be a game changer for wearable and even implantable circuits.

qxMo1DResearchers at the Center for Neuroprosthetics at the École Polytechnique Fédérale de Lausanne are in the business of engineering the interface between electronics and the human nervous system, and so have to overcome the mismatch between the hardware and wetware. To that end, [Prof. Dr. Stéphanie P. Lacour]’s lab has developed a way to apply a liquid metal to polymer substrates, with the resulting traces capable of stretching up to four times in length without cracking or breaking. They describe the metal as a partially liquid and partially solid alloy of gallium, with a gold added to prevent the alloy from beading up on the substrate. The applications are endless – wearable circuits, sensors, implantable electrostimulation, even microactuators.

Looks like progress with flexibles is starting to pick up, what with the conductive silicone and flexible phototransistors we’ve covered recently. We’re excited to see where work like this leads.

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Conductive Silicone Makes Flexible Circuits

Flexible circuits and wearables seem to be all the rage these days. We’ve got conductive paint, glue, and even thread. So how about conductive silicone? Well, as it turns out — it’s not that hard to make.

[Andrew Quitmeyer] has been researching flexible circuits for a while now, and recently stumbled upon an expired patent for flexible ignition cables, using carbon fibers mixed with a conductive silicone. He started playing around with it, and discovered that by dissolving pieces of carbon fiber in rubbing alcohol, letting it dry, and then mixing it into a 2-part silicone you get pretty good electrical conductivity. In fact, in the range of 40-150ohms, which is actually pretty darn impressive!

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Jellyfish Inspired LED Skirt for Burning Man

[Lumilectric] is getting ready for Burning Man and made herself this fantastic fiber optic LED skirt.

She’s always been fascinated by fiber optics and the effect they create, so she wanted to try using them in a project, and this was just the ticket. The tricky part was figuring out how best to couple cheap fiber optic strands off eBay with a strip of RGB LEDs.

In the end she figured out a way to make rudimentary fiber optic coupling joints using vinyl tubing. She managed to fit 17 strands of 0.5mm diameter fiber into a 6mm diameter vinyl tube. To improve light transfer when it’s all together, you can gently melt the ends of the fiber optics together to glaze the plastic into a single clear surface — don’t melt the vinyl though!

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Hackaday Prize Entry: Wearable Robotics Toolkit

The Internet overflows with prosthetics projects, and to a large extent this is somewhat understandable. Prosthetic devices are ultimately a custom made for each user, and 3D printers are trying to find a purpose. Put two and two together, and you’re going to get a few plastic limbs.

The electronics required for advanced prosthetics are a bit harder than a 3D scanner and a printer. If you’re designing a robotic leg, you will need to pump several hundred watts through an actuator to move a human forward. For the last few years, [Jean-François Duval] has been working on this problem at the MIT Media Lab Biomechatronics group and has come up with his entry for the Hackaday Prize. It’s a motor and motor control system for wearable robotics that addresses the problems no other project has thought of yet.

The goal of the FlexSEA isn’t to build prosthetics and wearable robotics – the goal is to build the electronics that drive these wearables. This means doing everything from driving motors, regulating power consumption, running control loops, and communicating with sensors. To accomplish this, [Jean-François] is using the BeagleBone Black, a Cypress PSoC, and an STM32F4, all very capable bits of hardware.

So far, [Jean-François] has documented the hardware and the software for the current controller, and has a few demo videos of his hardware in action. You can check that out below.

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The Raspberry Pi Wearable Revolution

With the human URL [will.i.am] serving as Chief Creative Director of 3D Systems, and [Martha Stewart] selling her own line of 3D printer filament through MakerBot, more and more celebrities are piling onto the hacker, maker, and DIY revolution. Now, the partnership we’ve all been waiting for: the Raspberry Pi Foundation and [The Artist Formerly Known As Prince_logo] are teaming up to produce a line of Pi-based wearable electronics. The first product from this new, fashionable line of electronics is beyond anything you would expect. It’s called the Raspberry Beret, and it’s shaping up to be a Revolution in wearables.

The wearable Raspberry Beret is exactly what you would expect: a habadasher’s masterpiece that pairs equally well with figure skating costumes and skin-tight cloud print suits. Inside, though, is a new piece of hardware based on the Raspberry Pi compute module. This module includes a Bluetooth module that will sync with any Windows phone. The Raspberry Beret also includes enough sensors that will blow away everything from a Fitbit to the new Apple Watch. The Raspberet will keep track of your heart rate, activity, and exercise routine.

The Raspberry Beret is just the beginning; the Pi Foundation and [The Artist Formerly Known As Prince_logo] are also teaming up with OSH Park to produce a limited, special edition Raspberry Pi 2. This board will be clad in the beautiful OSH Park purple soldermask and sports 4GB of eMMC Flash. This Flash will not be usable; instead it will contain a remastered edition of Purple Rain that will play as a startup chime. There will be no option to skip the chime.

Pancakes.

Self-Charging Jacket Eliminates Forgetfulness

Certain parts of the Northern Hemisphere are very, very cold right now. For those of us living in these colder climates, [Aaron] has a simple yet effective hack for keeping your hands warm when you go out for a walk in the brisk cold. He’s wired his jacket up for USB charging so he can make sure his hand warmers are always working.

[Aaron] bought a set of handwarmers that conveniently charge over USB, but he always forgot to actually plug them in once he got home, ensuring that they were always dead. To make his forgetfulness a non-issue, he built the USB charger for the handwarmers into his jacket, but he didn’t just run a wire out of the pocket. The USB charging circuit runs through the coat hanger, using some conductive cloth and steel thread in the inside of the jacket’s shoulders. From there, the cloth makes contact with the metal arms of the hanger and runs out of the hanger to the wall outlet.

This is a great cold-weather hack that might help any forgetful people on the north side of the planet keep warm. You could even use this method to charge batteries used in other wearable electronics. This project is a great reminder that sometimes the best hacks are the simple ones that no one’s thought of yet!