The Trans-atlantic Battery Bunny Divide

This somewhat frightening armature is the base for the iconic energizer bunny. While we love seeing the guts of popular robotics, this brings up an interesting fact. In Europe, the bunny is the symbol for Duracell. There’s an interesting story where Duracell had used the bunny for years in europe, only to inspire Energizer to copy them stateside in 1989. This one will be available on ebay shortly.

Catch a Duracell battery after the break

Continue reading “The Trans-atlantic Battery Bunny Divide”

Project J.A.R.V.I.S.

[brightcove vid=76029544001&exp3=16977198001&surl=]

Project J.A.R.V.I.S. is an attempt to create a digital life assistant, or DLA. The name comes from the version in the movie Iron Man. While the details of the build are pretty slim, you can see that he’s using a mac mini for the base with an Arduino controlled RFID reader at his door. What is really interesting is how functional he has actually made it. Watch the video on the site to see a pretty good explanation of features.

[via Gizmodo]

Teletype Twitter Frontend

The folks from NYC Resistor got their hands on a teletype machine and hacked it to monitor Twitter. This eighty-year-old beast bangs out messages that it receives at 45.45 baud. This isn’t a project that turns something into a teletype, but rather finds a different way to feed the machine data. In this case, a python script parses Twitter and sends the data it finds to an Arduino board. The Arduino in turn formats the message into the serial format necessary to communicate with the device. To the left you can see a trend plotter, learn more about both in the video after the break.

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Fully-automated Golf Ball Gun

If you get in the line of fire this golf ball launcher is gonna leave a mark, or worse. It’s based on the same premise as the sausage gun, but now everything is automated and no meat products are used.

A hopper stores a row of golf balls. When it comes time to load, a ball falls into the chamber, starter fuel is sprayed into the combustion area with the aid of a fan, and after both chambers are sealed the propellant is ignited.

We’ve embedded two videos below for your amusement. It looks like [Chrille] and his friends are being careful with their creation. We’re glad for that because this is about as dangerous as the high-velocity ping-pong ball launcher. Continue reading “Fully-automated Golf Ball Gun”

Logic Clock Without An On-board Oscillator

[Lucassiglo21] developed this logic clock without using a crystal oscillator or a resonator. Instead, he’s letting the incoming electricity keep the time for him. The supply is AC at 50 Hz so he’s using some 4017 decade dividers to reduce that down to a 1 Hz signal. From there it keeps track of the ticks just like the last digital logic clock we saw.

If you’ve used AC line frequency as the clock source in your project we’d like to hear about it. Send us a tip and make sure your writeup includes a schematic. We’re especially interested to see if anyone has a good way of using this method with inexpensive microcontrollers.