Magic Bottle Trick

Effect: 

The magician asks for a volunteer from the audience who looks inside a bottle to make sure it's a normal, empty container. 

The volunteer returns the bottle and then examines a magic wand to ensure it is normal. 

The magician drops the wand into the bottle (noting how easily it falls in).

He/she turns bottle over and lets go of the wand.  

The wand magically remains suspended in the bottle.

Supplies:

~a magic wand (could use a pencil instead) that is taller than the bottle (when you drop the wand into the bottle, part of it should still be sticking up through the opening.
~a bottle that has an opening large enough to fit the wand in (but not too big).  The bottle cannot be see-through
~an eraser

If you don't have a bottle that is dark, you can put some dark paint inside the bottle and shake it around so the inside is painted.

Cut a piece off the eraser, just large enough to wedge the wand into the opening of the bottle.  The eraser is what makes the trick work!

Secret:

Pass the bottle to the volunteer and ask them to make sure its empty.

Take back the bottle and give your friend the wand.  Meanwhile, slip the piece of eraser into the bottle without anyone seeing (you can have it in your pocket until this point).   You'll need to practice this a few times.

Take the wand back and drop it into the bottle.

Pick up the wand and bottle and turn them VERY SLOWLY upside down (mumble all sorts of enchantments while you're doing this).  Pull on the wand slightly when the bottle is turning over so the piece of eraser gets wedged into the opening (you'll need to practice this a few times too).

Let go of the wand... PRESTO!  It doesn't fall out.

Slowly turn upright again.  Let go of everything and PRESTO the wand remains suspended in the bottle (it doesn't fall back down).

To remove the wand, push it slightly to release the rubber and then take it out.

Coin Trick

Effect: 

The magician shows a glass, upside down, and a coin on a sheet of colored paper. 

He puts a handkerchief over the glass and moves it over. 

He pulls the handkerchief off and Abracadabra! the coin has disappeared. 

Supplies: 

A sheet of construction paper (1), a clear glass, a handkerchief and a coin. 

Preparation:  

Trace the glass onto the sheet of paper and cut the circle out.  Then tape it to the glass so when you put it onto a piece of paper the same color it blends in.

Secret: 

When you do the above put the glass onto a piece of paper and just basically move the paper covered glass over the coin while the whole thing is under the handkerchief so the glass covers the coin.  Pull off the handkerchief.  The coin will have "disappeared.

heap OLED display for your TI Launchpad

The guys over at the 43oh forums have been working on an OLED display booster pack for the TI Launchpad. The booster pack is now available in the 43oh store and is pretty cheap to boot.

The TI Launchpad is an awesome little dev board with a ravenous fan base. We’ve seen a lot of projects on Hack a Day use a Launchpad – everything from intervalometers to chicken coops. Unfortunately, the MSP430 doesn’t have the market penetration of the ‘board that shall remained unnamed,’ so it’s not very common to see a new Launchpad “shield.”

[bluehash] on the 43oh forums has been hard at work for the past month to put together his OLED booster pack. The display is 128×64 pixels with an incredible amount of brightness that we would expect from an OLED display. The software for the display is based on the SSD1306 driver with two font packs – Courier New large and small. Not a bad little piece of kit for an under appreciated dev board.

alculating Pi to 10 Trillion Digits; the last number is 5

In August, 2010, [Alexander Yee] and [Shigeru Kondo] won a respectable amount of praise for calculating pi to more digits than anyone else. They’re back again, this time doubling the number of digits to 10 Trillion.

The previous calculation of 5 Trillion digits of Pi took 90 days to calculate on a beast of a workstation. The calculations were performed on 2x Xeon processors running at 3.33 GHz, 96 Gigabytes of RAM, and 32 Terabytes worth of hard drives. The 10 Trillion digit attempt used the same hardware, but needed 48 Terabytes of disk to store everything.

Unfortunately, the time needed to calculate 10 Trillion digits didn’t scale linearly. [Alex] and [Shigeru] waited three hundred and seventy-one days for the computer to finish the calculations. The guys used y-cruncher, a multithreaded pi benchmarking tool written by [Alex]. y-cruncher calculates hexadecimal digits of pi; conveniently, it’s fairly easy to find the nth hex digit of pi for verification.

If you’re wondering if it would be faster to calculate pi on a top 500 supercomputer, you’d be right. Those boxes are a little busy predicting climate change, nuclear weapons yields, and curing cancer, though. Doing something nobody else has ever done is still an admirable goal, especially if it means building an awesome computer.

ANT+ networks using an MSP430 chip and Android phone

Jbremnant] wanted to try his hand with ANT+ wireless networks. This protocol is designed for light-weight and low-power consumer electronics, like heart rate chest straps and bicycle computers (Garmin brand devices for example). There are already libraries out there for Arduino, but [Jbremnant] found that most of them were written as slave-only code. He set out to use an MSP430 to drive a fully functioning ANT network including a computer and an Android phone.

The TI Launchpad is used as the master node in the network. [Jbremnant] chose the smaller of the two MSP430 processors that came with the dev platform. After starting down this road he realized that chip didn’t have a hardware UART needed to communicate with the SparkFun ANT board (based on the nRF24AP1 radio chip). Rolling with the punches, he used a software UART he had previously worked with. Now he’s able to transmit test data from the Launchpad. It is picked up by both a USB dongle on his computer and the Android phone seen above. Check out his demo video after the break.

http://www.youtube.com/watch?feature=player_embedded&v=ck9I86ENKLI

Mark your Territory

Although Dogs and other animals love to mark their territory with urine, this technique has been generally ignored by human beings. Despair no more, fellow homo sapiens, we have now developed the ability to check-in on foursquare through your information stream. This device is descriptively called “Mark your Territory.”

Although this is not currently available to buy in stores (although apparently $10,000 will get you one built), [Instructables] user [blorgggggg] has furnished directions on building your own. The system is powered by an Arduino and an Android phone. The urine tags have both a pointed end for sticking in grass and the like, and a sticky back to be used in a “more urban settings.”

The video after the break gives quite a bit of background trying to justify such a system in terms of communicating in the physical world, animals, et cetera, but it’s doubtful that this excuse will get you out of a public urination charge. You’ve been warned.

http://www.youtube.com/watch?feature=player_embedded&v=rRdfeb7vDWg

G35 LED Christmas Light Review and Teardown

[Todd Harrison] took a slew of pictures in his quest to loose all the secrets of the G-35 Christmas Lights. These are a string of 50 plastic bulbs which house individually addressable RGB LEDs. We’ve seen a ton of projects that use them, starting about a year ago with the original reverse engineering and most recently used to make a 7×7 LED matrix. But most of the time the original control board is immediately ditched for a replacement. It’s become so common that you can now buy a drop-in board, no hacking needed. We enjoy the hard look that [Todd] took at the electronics.





The stock controller uses a single layer, single sided board. There’s a resin-blob chip, but also an SOP-20 microcontroller. Since [Todd's] using several strings of lights on his house, he wondered if it would be possible to improve on the controller in order to synchronize the strands. His investigation showed that the board was designed to host a crystal oscillator but it is unpopulated. Unfortunately you can’t just add those parts to improve the timing of the chip (firmware changes would also be requires). He found that there’s a spot for a push-button. Quickly shorting the pads cycles through the effects, shorting them for a longer time turns off the string of lights. There is wireless control, but it seems that the only functionality it provides is the same as the unpopulated switch.

We enjoyed the close-up circuit board photos, and we like the spacing jig he used to attach the lights to his fascia boards. We’ve embedded a lengthy video about his exploits after the break.