TI Chronos watch monitor your sleeping infant

[Bill] wants a little piece of mind when his infant is sleeping in the other room. For him, the audio-only baby monitor could use some improvement. His proof-of-concept is that blue patch Velcroed on the swaddled infant. It monitors movement, orientation, and temperature and alerts you when something’s amiss.

Inside the pouch you’ll find a TI Chronos eZ430 wristwatch with the band removed. It’s a nice hardware choice because it includes an accelerometer, temperature sensor, and RF link to a USB dongle. [Bill's] code sends a data packet to the PC about once a second. The PC watches to make sure there’s slight motion, indicating the baby is breathing. This part doesn’t work all that well as the accelerometer doesn’t pick up tiny movements all too well, but it does have potential. In the video after the break you can see the functions which make sure the baby doesn’t roll onto its belly, and that she’s not too cold do work extremely well.

We wonder if the accelerometer would pick up more motion if the watch was hung from a string inside of a small enclosure. This way it would swing back and forth with small movements. But perhaps that would make the whole thing too bulky?

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A resistor’s fiery death used to launch fireworks

Check out this control center which [Awesome0749] built for launching fireworks. From the looks of his stash he’s going to be doing quite a bit of celebrating. The control console is clean and offers some safety features, and he just upgraded to an interesting ignition technique.

He’s using CAT5 cable to connect to the fireworks. At the top of the enclosure you can just make out the edge of the almond-colored wall plates which offer three jacks each. The two keys on the controller must be turned on to power the device. There is also a safety toggle switch in the middle.

The ignition is cause by running 70 VDC through a 1/4 Watt 24 Ohm resistor. As you can see in the demo after the break this results in flames quite quickly. One other thing we saw in the demonstration is that only the LED for the button which is hooked up comes on when the system is armed. We didn’t see a schematic, but he must have wired this so the system checks for continuity to ensure there’s something wired to the business end of the button.

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Roller coaster simulator for the Redbull creation contest

[Dave] and [Martin], otherwise known as Ballistic Locomotive, sent in their entry for the Redbull creation contest. It’s a roller coaster simulator that can emulate the twists, turns, and drops of a roller coaster in your living room.

The simulator is built around a plywood roller coaster car mounted on a 2 DOF table. With a few first-person roller coaster videos and the speed, roll, and tilt data provided. Ballistic Locomotive had a functioning roller coaster simulator.

Of course, watching a 1st-person shot of a roller coaster just isn’t the same experience without the wind blowing through your hair. To simulate this aspect of a roller coaster ride, so the Ballistic Locomotive team connected a relay to the bullduino and connected a carpet drying fan.

Not only did Ballistic Locomotive build something awesome with their bullduino, they also manage to make a great ride for one of the builder’s son’s birthday party this weekend. You can check out the demo and a few videos after the break.

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Fifa looks at electronic augmentation

The [Fédération Internationale de Football Association] is joining the growing list of professional sports that is adopting technological means in an attempt to help the human referees. After a botched call in 2010 the organization called for a system that would work day or night, with 100% accuracy and the ability to report to the Refs in less than 1 second. The applicants have been weeded out and it comes down to two systems, both of which use a piece of personal hardware we’re quite familiar with. [Fe80], who sent in the tip, recognized the TI Chronos eZ430 watch in the image above.

The two systems both use the watch as an interface, but work very differently. The first, called GoalRef, uses a sensor suspended inside the ball. This detects a magnetic field made up by the goal posts. We’d guess it’s an inductance sensor that is triggered when it passes a coil in the goal posts (we didn’t find much in the way of technical info so please do your own speculation in the comments). The second system is very familiar. It’s the Hawkeye camera system used by the APT (Tennis) in all the major tournaments.

Kansas City MakerFaire: Greentechweekly’s coverage

We hadn’t been at the MakerFaire long when we ran into a couple hackaday fans lugging around camera equipment and microphones. I agreed to a quick interview for their show greentechweekly.tv which was fairly painless, then we all went our separate ways. [EcoGeeco] later sent me the footage and I couldn’t help but think… these guys did a better job than I did!  They asked some great questions, got some great footage, somehow managed to get decent audio too!

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The most surprising game of Simon you’ve every played

How does one take a game of Simon and make it extremely awesome? The folks at the North Street Labs — a Hackerspace in Portsmouth, Virginia — have found the secret and it’s all in the execution. They turned this chair-desk into a coin-operated Simon game that hides a huge surprise.

We suppose you should be able to guess the secret. Most coin-operated sidewalk attractions are rides, and so is this. As their Red Bull Creation entry the team built a base for the desk around a 2000 Watt floor buffer. These are the kind of things that you’d see a janitor in the 1980′s using to polish the tiles of your middle-school.  This one just happens to shake the bejesus out of a player who makes a mistake. To help suck you into the game this won’t happen right away. You have to make it past at least four rounds before making the mistake.

The rest of the game is as expected. The playing area is nicely milled from a piece of wood with acrylic windows serving as the buttons. Apparently the biggest problem with that part of the build is finding a way to hold everything together despite the intense vibrations. See for yourself in the clip after the break.

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Ask Hackaday: Who wants to build a function generator?

[tari] sent in a tip about a MAX5214 DAC evaluation board AVNET is giving away this summer.  The MAX5214 / MAX5216 is a neat little chip providing a 14 or 16 bit DAC with a serial interface in a tiny 8-pin package. [tari] thinks this eval board could be hacked into a function generator, and we’ve got to agree. Now, who wants to build one?

It’s entirely possible to take the MAX5214 chip and put it in a circuit with a small ARM uC, a display, and a few knobs, but that seems like a waste of time given function generators of this caliber are already available for about $60. It seems the most efficient hack of this dev board will be simply adding an amplifier to this board’s output and possibly programming a better interface than the current LabView software available.

If you want to tinker around with some free hardware and make something useful in the process, have a go at making a function generator out of this dev board. Be sure to send it in when you’re done.