Millivolt Meter Nixie Clock

October 25, 2011 by 9 Comments

Surprisingly, up until a year ago, [Jimmy] hadn’t seen a Nixie tube. Awful we know, but he has come around to the beauty of glowing numbers in a tube. He recently found an old millivolt meter in a junk pile that used Nixie tubes. The wondrous orange glow beckoned him, so [Jimmy] decided to build a clock.

Just about all of the Nixie clocks we’ve seen (including non-clock builds) rely on building a controller for the Nixie tubes. The controllers range from Nixie Arduino shields to the good ‘ol 74141 IC. [Jimmy] realized he didn’t need to bother with controlling the tubes in an already functional millivolt meter – he only needed to send the right voltage.

For his clock build, [Jimmy] used an Arduino to output a voltage through a bunch of resistor dividers. For example, if the time is 12:30, the output voltage will be 12.30mV. Using this technique, the values for the needed resistors don’t exist, so a little bit of PWM means the Arduino keeps fairly good time.

There’s one added bonus of [Jimmy]’s clock – because the voltage varies around 0.01mV, the finished project acts like a digital version of Lord Vetinari’s clock. It may not be perfect, but at least a nice piece of equipment was saved from the trash.

Halloween Hacks: Death Throws A Party

October 25, 2011 by 3 Comments

If you him the Grim Reaper, Azrail, Magere Hein, or simply, ‘Death,’ he sure throws a good party. [Victor] has an anatomical model of a skeleton at his job named [Hein], and for his birthday party, his coworkers decided to throw [Hein] a party.

[Victor]’s first skeleton-based build was last summer. The twinkle of the summer sun in [Hein]’s eye socket made for a great occasion to dress the skeleton up in some summer garb. [Hein] was dressed in a fashionable Hawaiian shirt and put in a window along a corridor. Of course, a skeleton is no good if there’s no element of surprise, so [Hein] held disposable camera that flashed every time someone walked by.

[Hein]’s birthday spectacular required something a bit more shocking. A blowout whistle was added to [Hein]’s mandible. With a PIR sensor and a TI Launchpad, [Hein] was commanded to blow the whistle every time someone walked by.

[Victor]’s builds may not have the shock value – or even be as scary as Halloween necessitates – but he’s got a few good ideas for what could become a great yard display. Check out the video after the break to see [Hein] greeting [Victor]’s coworkers.

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Minimalist DIODER Hack Requires No External Microcontroller

October 25, 2011 by 10 Comments

pic_dioder_hack

Hackaday reader [chrysn] picked up a 3-button RGB model DIODER light from IKEA and thought he might as well take it apart to see what he could do with it. Having seen several DIODER hacks featured here, he knew it was easily hackable, but he didn’t want to simply rehash what other had already done.

All of the DIODER hacks we have come across thus far incorporate some sort of AVR chip or add-on board to expand its capabilities. [chrysn] saw that the controller already had a PIC16F684 inside, and thought that installing his own firmware onto the existing hardware would be a far more simple solution. He installed a small programming cable onto the DIODER’s control board, and using his PICkit2 programmer, flashed the chip with a custom firmware image.

His modifications worked great, and [chrysn] says that there is plenty potential in the existing hardware to have all sorts of fun with it. Even so, he notes that there are several AVR-flavored drop-in replacements that can be used if that happens to be your microcontroller family of choice.

You Want How Much For A Phone Charger?

October 24, 2011 by 68 Comments

People quickly find out that I am a dork, and their next question typically is “why do you own that old as dirt dumb phone?”. Well to be honest, I don’t like phones. After a decade of Palm Pilots and Windows CE devices, I really don’t like touch screens either (fat man fingers and a bad habit of chewing nails does not help). I also do not like that in order to get a fancy PDA with a radio you usually have to sign up for a data plan, or pay for the thing in full.

Now get off my lawn! Seriously though, I really only need my phone to do two things, make phone calls, and send SMS messages. If I had a wishlist the only other things I would like is mass storage for MP3 files, and Bluetooth. Naturally when I started my new day job I found the geek in the department and shortly there after I got asked about my basic LG flip phone.

After a few days of interrogation I jokingly snapped back with “well since you are so worried about it why don’t you give me a better phone!” With a little hinting around and a bribe of a “Swiss Roll” at lunch, I was given an old HTC phone with Windows Mobile 5.

While it is not exactly an iPhone or an Android,  it is much more featured than what I had, and it has a mini SD card slot and Bluetooth! The only catch was, he could not find the charger. We did not know if the thing even worked (he had never seen the thing turned on) , or what condition the battery was in.

As a good little hacker I took it anyway,  join me after the break to see me get it fired up and save a quite a bit of change in the process.

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Laser Cut 3D Sculptures Remind Us Of An Old Playstation

October 24, 2011 by 21 Comments

[Paul] a.k.a. [VoidFraction] put up the source and documentation for his sculptures made with laser cut polygons.

For computing his triangles, [Paul] developed LcAgl, an algorithm that transforms a 3D model into the AutoCAD file needed to cut a whole bunch of triangles and connectors. This file was shot over to a laser cutter and after a confusing assembly, [Paul] can make just about any low polygon count model he wants.

For his sculptures, [Paul] uses Coroplast, a type of corrugated plastic commonly used in political campaign signs. Coroplast is lightweight and flexible, a bonus when [Paul] is fitting his triangles together. The connecting tabs are made from acrylic – a very rigid material, so the triangles are held tightly in place.

Since the models in most 3D games are just a bunch of polygons anyway, this technique reminds us of the first 3D console games. [Paul]’s rhino looks like it walked off the set of a low polygon game like Virtua Fighter or Jumping Flash!.

Giving Siri The Keys To Your House

October 24, 2011 by 30 Comments

We haven’t really covered many hacks having to do with Apple’s newest iPhone feature Siri. We’d bet you’ve already heard a bunch about the voice-activated AI assistant and here’s your chance to give it the keys to your house. This project uses Siri to actuate the deadbolt on an entry door in a roundabout sort of way.

This is really just a Siri frontend for an SMS entry system seen in several other hacks. The inside of the door (pictured above) has a servo motor mounted next to, and attached via connecting rod with, the lever-style deadbolt. An Arduino equipped with a WiFly shield controls that servo and is waiting for instructions from the Google app engine. But wait, they’re not done yet. The app engine connects to a Twilio account which gives it the ability to receive SMS messages. Long story short; Siri is sending a text message that opens the door… eventually. You can seen in the demo after the break that the whole process takes over twenty seconds from the time you first access Siri to the point the bolt is unlocked. Still, it’s a fine first prototype.

There’s a fair amount of expensive hardware on that door which we’d like to see converted to extra feaures. [CC Laan] has already added one other entry method, using a piezo element to listen for a secret knock. But we think there’s room for improvement. Since it’s Internet connected we’d love to see a sensor to monitor how often the door is opened, and perhaps a PIR sensor that would act as a motion-sensing burglar alert system.

Don’t need something this complicated? How about implementing just the secret knock portion of the hack?

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Washing Machine Powered Bike

October 24, 2011 by 62 Comments

[Ameres Valentin] was looking for a less expensive way to get around after spending in excess of 100 Euros a month on public transportation in Munich. His solution is an electric bicycle powered by a washing machine motor. It’s a 300 Watt motor that runs on 24 Volts, capable of around 3000 RPM. We’re used to seeing hub motors or chain drives on electric vehicle hacks, but it looks like [Ameres] is using a flywheel on the motor shaft to drive the rear wheel of the bike through direct contact.

Inside the saddle bag you’ll find two 12 volt 12 amp hour sealed lead acid batteries which are used in series. It looks like he charges these with a wall wart (that we think might use a switching power supply) modified with a couple of large alligator clamps. A push button mounted on the handlebars makes it go.We wonder if he’s still able to pedal when the batteries are running low? We don’t see a way to disengage the motor from the rear wheel so we’d bet this is something of an issue. Then again, if that charge actually works you’re never far from an opportunity to top off the batteries.

Check out a quick clip of the motor spinning the wheel embedded after the break.

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