Custom Lightbulb Firmware

October 1, 2017 by Lewin Day 15 Comments

The Internet of Things is developing at a rapid pace, as hobbyists and companies rush to develop the latest and greatest home automation gear. One area of particular interest to some is lighting – yes, even the humble lightbulb now comes with a brain and is ripe for the hacking.

[Tinkerman] starts by doing a full disassembly of the Sonoff B1 lightbulb. It’s a popular device, and available for less than $20 on eBay. Rated at 6 watts, the bulb has a heatsink that is seemingly far larger than necessary. Inside is the usual AC/DC converter, LED driver and an ESP8285 running the show. While this is a slightly different part to the usual ESP8266, it can be programmed in the same way by selecting the correct programming mode.

This is where it gets interesting – [Tinkerman] flashes the device with a custom firmware known as ESPurna. This firmware enables greater control over the function of the bulb, from colour choice, to speaking to the bulb over MQTT.

[Tinkerman] does a great job of walking through the exact steps needed to disassemble and reprogram the bulb, and touches upon the added flexibility given by the custom firmware. We love to see projects like this one, that give greater control over IoT devices and enable users to better integrate them with other systems.

LED Princess Dress Also Lights Up Girl’s Face

September 30, 2017 by Kristina Panos 14 Comments

We’re pretty sure that [Luke] took Uncle of the Year last Halloween when he made an RGB LED princess dress for his niece. He recently found the time to document the build with a comprehensive how-to that’s just in time for Halloween ’17.

[Luke] made the system modular so that his niece could use it with any dress. The RGB LED strips are actually fastened down the inside of a petticoat — a fluffy, puffy kind of slip that’s worn underneath the dress. The LEDs face in toward the body, which helps diffuse the light. [Luke] first attached the strips with their own adhesive and then spent a lot of time sewing them down so they stayed put. At some point, he found that hot glue worked just as well.

The coolest part of this project (aside from the blinkenlights of course) is the power source. [Luke] used what he already had lying around: an 18V Ryobi battery pack. He wired a step-converter to it using a printed cap from Shapeways that’s designed to connect metal clips to the battery contacts. This cap really makes these packs useful for a lot of projects that need long-lasting portability.

These batteries are rated for 240W, which is overkill considering the load. But there’s a reason: it keeps heat to a minimum, since the electronics are hidden inside a cute little backpack. Speaking of cute, you can see his niece model the dress after the break.

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Modern Strongman Games Test Your Speed Instead

September 30, 2017 by Steven Dufresne No comments

Step right up! What would a Makerfaire be without some carnival games? And being a Makerfaire, they could of course be modernized versions. In [avishorp]’s case, he made a series of games that test your speed and look very much like the old strongman game, aka high striker or strength tester.

In the strongman game, you smash a lever with all your might using a hammer. A puck on the other end of the lever then shoots up a tower, hopefully high enough to hit a bell, winning you a prize. In [avishorp]’s games the puck, tower and bell are all replaced with an LED strip. In the swipe game, the faster you swipe your hand sideways over two optical proximity sensors, the higher the LEDs light up. In the drum game, the speed with which you drum on a rubber disk with embedded accelerometer, the higher the LEDs light up. The chase and response games both involve buttons that you have to rapidly hit, to similar effect.

For the brains, each game is controlled by an Adafruit Trinket board. [Avishorp] chose to use the PlatformIO IDE instead of the Arduino IDE to write them, preferring its modern editor, but he didn’t like that it doesn’t print and that it doesn’t tell you the final file size. The latter issue caused him to overwrite the bootloader, something that he understandably considered a major inconvenience.

Check out his page for more details, Fritzing diagrams, links to code, and all game videos. Meanwhile we’ve included clips of the drum and swipe games below.

And if it’s more carnival games you’re looking for, how about this adult-sized Sit ‘n Spin made using a rear differential and axle assembly out of an old car or truck. Or maybe you prefer something less likely to make you woozy, in which case you can try fishing with the Bass Master 3000.

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Giant D20 Is A Critical Hit In More Ways Than One

September 24, 2017 by James Hobson 18 Comments

[Mikael Vejdemo-Johansson] is a member of the NYC Resistor hackerspace and an avid fan of a D&D themed improv theatre called The Campaign. To show his appreciation, he decided to gift them a Christmas present: a giant D20. The original plan called for integrated LEDs to burst alight on a critical hit or miss, or let out pulses if it landed on another face. Cool, right? Well, easier said than done.

[Vejdemo-Johansson] figured a circle of 4 tilt sensors mounted on the one and twenty face would be enough to detect critical rolls. If any of the switches were tilted beyond 30 degrees, the switch would close. He mounted eight ball-tilt switches and glued in the LEDs. A hackerspace friend also helped him put together an astable multivibrator to generate the pulses for non-critical rolls.

This… did not work out so well. His tilt sensor array proved to be a veritable electronic cacophony and terribly sensitive to any movement. That and some other electronic troubles forced a shelving of any light shows on a critical hit or miss. [Vejdemo-Johansson] kept the pulsing LEDs which made for a cool effect when shining through the mirrored, red acrylic panes he used for the die faces. Foam caulk backer rods protect as the die’s structure to stop it from being shattered on its first use.

Before The Campaign’s next show, [Vejdemo-Johansson] managed to stealthily swap-out of the troupe’s original die with his gift, only for it to be immediately thrown in a way that would definitely void any electronic warranty. Check out the reveal after the break (warning, some NSFW language)!

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Need A Night-Light?

September 19, 2017 by Lauren Faris 36 Comments

[Scott] created an LED candle in preparation for the big mac daddy storm (storms?) coming through. Like millions of other people in Florida, he was stuck at home with his roommates when an oncoming hurricane headed their way. Worrying about blundering about in the dark when the power inevitably went out, they set off to gather up all of the candles they had lying around. Realizing the monstrous pile of candles and matches looked more and more like a death wish, the decision was made to create a makeshift light out of what components they had on hand. Now, not having access to any outside sources for parts means that you are going to have a bare bones model.

That being said, this straightforward light only takes a couple of seconds to put together. Jury rig a couple of AA or AAA batteries up, then slap on a resistor, LED, and jumper to get that sucker running. Wrap electrical tape around the whole thing, or even try duct tape, whatever gets the job done. A little paper hat on top of it will diffuse the light and bada bing, bada boom, you’re all done. Generally though, soldering directly onto a battery is not a wise idea. So, if you want to get fancy, perhaps a better alternative is to have a battery casing as shown below.

This LED candle is a clear option if your home isn’t a micro warehouse for electronic components (apparently it is frowned upon to clog up your garage for projects), and you have limited time. However, if you have a number of extra minutes lying around before your windows blow in, see if you can top the brightest flashlight ever made (thus far). Continue reading “Need A Night-Light?” →

A Lightsaber, With Rave Mode

September 16, 2017 by James Hobson 21 Comments

How often after being exposed to Star Wars did you dream of having your own working lightsaber? These days — well, we don’t quite have the technology to build crystal-based weapons, but tailor-made lightsabers like redditor [interweber]’s are very much real.

Piggybacking off the Korbanth Graflex 2.0 kit — a sort of bare-bones lightsaber ready to personalize — [interweber] is using a Teensy 3.5 to handle things under the hilt. Instead of taking the easy route and cramming everything into said handle, a 3D printed a cradle for the electronics and speaker keep things secure. The blade is made up of two meters of APA102 LEDs.

As well as all the sound effects appropriate to ‘an elegant weapon for a more civilized age’, a cluster of buttons handle the various functions; , playing and cycling through music(more on that in a second), changing the color of the lightsaber — Jedi today, Sith tomorrow — enabling a flickering effect that mimics Kylo Ren’s lightsaber, color cycling, and a…. rave mode?

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We Are Now At DEFCON 2

September 16, 2017 by James Hobson 18 Comments

If you had a working DEFCON meter that reported on real data, would it be cool or distressing?

Before we get ahead of ourselves: no, not that DEF CON. Instructables user [ArthurGuy] is a fan of the 1983 movie War Games, and following a recent viewing –hacker senses a-tingling — he set to work building his own real-time display.

Making use of some spare wood, [ArthurGuy] glued and nailed together a 10x10x50cm box for the sign. Having been painted white already at some point, the paint brilliantly acted as a reflector for the lights inside each section. The five DEF CON level panels were cut from 3mm pieces of coloured acrylic with the numbers slapped on after a bit of work from a vinyl cutter.

Deviating from a proper, screen-accurate replica, [ArthurGuy] cheated a little and used WS2812 NeoPixel LED strips — 12 per level — and used a Particle Photon to control them. A quick bit of code polls the MI5 terrorism RSS feed and displays its current level — sadly, it’s currently at DEFCON 2.

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