Peter, from Rossum's Posterous, asks the musical question:

Can you make an iPhone out of an AVR? No. Can you get a surprising amout of functionality out of a humble 8-bit processor and a cheap touch LCD? Yes.

AVR homebrew device with iPhone aspirations [via Peter Horvath's Twitter feed]

Here's an interesting take on a coil gun, by Russian YouTube user fuckertrezv. Not content to simply make a high-power electromagnetic device, he designed his to be portable and run on batteries. Once charged, he claims it is capable of accelerating metal rings to over 200 meters per second. It looks well-built, however no instructions are provided. [via hacked gadgets]

We had a great contest this year, with tons of awesome projects, and frankly we had a heckuva time picking winners. But the votes are all in now, and with the scores finally tabulated, I am pleased to announced the winners of the Make: Halloween Contest 2009.

The envelope please....

Third runner-up: Everett Bradford's "Prometheus Device"

Everett has won an F1 Evaluation Platform (valued at $39.99), plus a $50 Maker Shed gift certificate.

Second runner-up: Eric Kingston's "Silly String Shooting Pumpkin"

Eric has won a PICKIT 3 (valued at $69.99), plus a $50 Maker Shed gift certificate.

First runner-up: Ian Fagan's "Ghostbusters Proton Pack"

Ian has won a PICDEM Lab (valued at $124.99), plus a $50 Maker Shed gift certificate.

Grand Prize Winner: Jared Martin's "Mr. Bones and the Gourditos"

Jared has won a Microchip Starter Kit Bundle (valued at $600.00) which includes a PIC18 Starter Kit, a PIC24F Starter Kit, a dsPIC DSC Starter Kit, a PIC32 Starter Kit, a Memory Starter Kit, an F1 Evaluation Platform, and a PICKIT 3.

Congratulations to all our winners and, indeed, to everyone who entered! And thanks to our sponsor, Microchip Technology, for making the whole thing possible!

Happy Halloween!

Wish you had a skylight, but don't have the ability to cut a hole in your roof? MAKE subscriber Chris did to, and wrote in to share his solution to the problem: a pv+led-based 'fake' skylight. The concept is pretty simple, but with a nice result. He had some unused capacity on his PV (photovoltatic) solar panel, and basically hooked up a bunch of high power LEDs directly to it. To achieve the 'skylight' look, he built a custom metal box with a glass diffuser screen, and mounted the diodes inside of it. He has a nice write-up on his site, along with a calculator to determine how the LEDs should be connected. Excellent work!

A reader just sent me a link to servodatabase.com, which lists RC servo specifications and provides user reviews, a comparison engine, and various forms of sorting. Looks like a very good resource. [Thanks, Phil!]

Care to hand control of your playlist over you to an Arduino?

Awhile back I was working on a project that that I wanted to be able to start music the on my mac through the IR receiver. After a while of looking around I found this library  which allows you to use your arduino as an Apple Remote. I integrated it in to my project and it worked great! So the other day I decided to make an Apple Remote shield for my arduino.

You can get 'em from the Evil Mad Scientist Laboratories webstore. Update: Also available from The Maker Shed.

David King built this stoplight costume for his oldest daughter. It's his first Arduino project. Besides flashing the expected red, green, and yellow lights, it incorporates an Adafruit WaveShield to play music. [Thanks, David!]

In the Maker Shed:

Arduino WaveShield Kit

Need a reminder to hook your capacitors up correctly? Try watching this video by Dave of EEVblog, exploding capacitors in high speed. Taking advantage of his new high speed camera, he filmed the thermal breakdown caused by reverse biasing on a number of different types of polarized capacitors. Neat effect,, but certainly not something I would want to happen next to a freshly designed circuit board.

Eric Lowry built this sweet WoW magic-user costume for his son. It has LED health and mana bars, LED magic power in the gloves, and an LED, er, "touch-sensitive fairy companion." There's one Arduino for the gloves and status bars, and another for the companion.

MAKE subscriber Justin fused the convenience of digital music with the feel and playback functionality of a cassette -

It is a cassette tape adapter and a micro usb port hooked up to a tiny mp3 player that I picked up at target. Its a simple build and only took an evening. Its an on going project I started a while back.

In July, 1969, a ham radio operator named Larry Baysinger, from Louisville, KY, used a 20-year old radio from an army tank and a homemade folded dipole antenna array to listen to the Apollo 11 astronauts on the moon. This page is an archive with the original newspaper piece, photos, PDFs of a couple of radio hobby mags and books of the time, and a sort of where are they now update. MP3 of Baysinger's recordings of the audio are also there. Fascinating stuff.

Lunar Eavesdropping in Louisville, Kentucky

John Russell made this fantastic haunted house prop. In his own words:

Two aliens contained in suspended animation chambers. A central control unit monitors and sustains life support functions. The control screen is a looping flash animation. Every few minutes, a malfunction state is triggered. Sound and graphics announce the error, and a Make Controller board is used to trigger emergency flasher lights and a fog machine (simulates a cryogenic coolant leak).

The video shows the system going into its "malfunction state." Awesome work, John!

Make: Halloween Contest 2009

There's still time left to enter the Make: Halloween Contest 2009! Deadline is 11:59 PM PST, November 3rd. Show us your embedded microcontroller Halloween projects and you could be chosen as a winner.

Fred points out this schematic for a rather interesting radiotelephone transmitter instantaneously powered by the operator's voice -

One of the neatest minimalist amateur radio transmitter circuits around - this one is voice powered - it provides DSB, (double side band)modulation and power from an ordinary 8-ohm speaker - if are in doubt that the circuit works, the maker has the contacts and the voice recordings to prove it!

This is the second revision of my PIC based LED binary clock. The original version was the first PIC project I attempted, it used a PIC16F84A to do both the timekeeping and control the display matrix, unfortunately it didn't keep good enough time and gained about a minute every week.

In the Maker Shed:


In the Maker Shed: DIY Design Electronics Kit

Have a broken robotic toy that you want to bring back from the dead? Why not follow the lead of Morten Skogly, and re-animate it with a toy synthesizer? The FrankenDog looks like a good way to get some use out of an old toy, at least until you get around to pulling the motors out of it. I like the control 'switches' built by sticking conductive tape at the edge of the plastic piano keys.

RFID card readers becoming passé? Maybe what you need to guard the door to your high-tech lair is a secret knock detecting door lock. Using an Arduino and a bunch of parts found around the lab, Steve Hoefer built a device that unlocks your door when it receives a certain knock pattern. It works by counting the time between successive knocks, and can be re-programmed at the touch of a button.

Of course, this system is susceptible to a replay attack, because anyone can listen to the knock pattern and then know how to get in. If you are planning to use something like this, I would recommend either incorporating a timestamp into the message, or using a series of one time knocks, in order to make it harder to break into. Actually, that might make it more secure than a regular lock.

The beginnings of an Aliens-style (except, you know, without all the actual bullets and killing and so forth) automatic sentry gun from diederick. The tracking platform is obviously flexible, but I think he intends to mount an AirSoft gun. Build details and code downloads are available from his website.

It's the '60s, and you don't have access to a semiconductor fab to make piles of cheap memory for you, so how could you store data on your computer?

Well, MAKE subscriber Steve points us to one possible solution, courtesy of vintagecalcuators.com: delay line memories. Rather than having a bunch of individual units that store a bit each, these memory devices work by storing data in sound (compression) waves. The device consists of a long length of wire, with an actuator on one end to vibrate the wire, and a reader on the other end to pick up vibrations. Because the vibrations don't travel very fast along the wire, you can make a whole bunch of them before the first one reaches the end of the wire, and that becomes the 'size' of the memory. Data can be read back by looking for a vibration at a particular time- if there is one, that corresponds to a '1', and if there isn't, it would be a '0'.

It sounds a bit weird, so I like to think of it like this. If you had a hard time remembering things for very long, and happened to live in a cave, you could just shout out what you didn't want to forget, and a few seconds later you would hear an echo to remind you. Of course, the problem with this is that an echo doesn't stick around for long, so you would have to shout again every time that you heard the echo, so that you could remember again in a few seconds. Assuming you could keep this up, you would never forget your idea. Of course, that would get really tiring after a while, so you would be much better off just writing it down.

The memory shown above is from a Monroe Epic 3000 calculator, which was apparently the first programmable calculator with a printer built in.

Really sweet Mario costume with built-in classic sound-effects from Adafruit forum member djmacatack. It uses an Arduino with an Adafruit WaveShield. [Thanks, Becky!]

Make: Halloween Contest 2009

There's still time left to enter the Make: Halloween Contest 2009! Deadline is 11:59 PM PDT, November 3rd. Show us your embedded microcontroller Halloween projects and you could be chosen as a winner.

Here's what comes in each kit:

• 3.5'' LCD (320hx240v 16bpp TFT) with Touch Screen
  
• Texas Instruments TSC2100 Programmable Touchscreen Controller with Stereo DAC
  
• Plastic Front Bezel
  
• Gasket
  
• Aluminum Frame
  
• 4 x Screws to attach Aluminum Frame to Front Bezel
  
• 350MHz Freescale iMX21 MC94MX21DVKN3 ARM9 controller Motherboard Circuit Card Assembly with Samsung 64MB SDRAM on 32-bit data path and Hynix HY27US 64MB NAND Flash ROM
  
• Kionix KXP74-1050 3-axis accelerometer
  
• Daughtercard Circuit Card Assembly
  
• Three USB 2.0 full speed ports, one internal, two external
  
• Chumbilical Flex Cable from Daughter card CCA to Motherboard CCA
  
• Wifi Riser Circuit Card Assembly
  
• USB Wifi Dongle based on the Xterasys 3135G 802.11g USB Wifi adapter (ralink chipset)
  
• Flex Cable for Wifi Riser CCA to Motherboard CCA
  
• 3 x Screws for Wifi Riser CCA to Motherboard CCA
  
• 3 x Standoffs for screws for Wifi Riser CCA to Motherboard CCA
  
• 2 x 2W StereoSpeakers
  
• 4 x Screws for Speaker to Plastic Speaker Holder
  
• Plastic Speaker Holder
  
• Switch for Bend Sensor
  
• Plastic Switch Holder
  
• 2 wire cable with 2 pin connector (from Daughterboard CCA to switch)
  
• 2 x Screws to Attach Switch to Plastic Switch Holder
  
• 12 V DC 1A Power Supply
  
• Built-in microphone

(Note: actual parts may vary slightly due to manufacturing and availability)

Guilherme Martins built this "talkie walkie" in response to a challenge to build a robot using only one servo. It responds to sound in real time, automatically controlling the movements of a lip-syncing paper mouth. [via Hack a Day]

Chiphacker is a collaboratively edited question and answer site for electronics hackers – regardless of platform or language.

This is very cool - Dann Green of 4ms Pedals has posted schematics, code, and parts list for the Autonomous Bassline project. The ATtiny84 based module is also available in kit form with an optional heavy-duty enclosure. And if this thing wasn't awesome enough as is - an infrared clock signal can be used to drive the unit.

Ian Lesnet submitted this cool hack-'o-lantern to our Make: Halloween Contest 2009. There's an Instructable here, a Flickr set here, and YouTube video here. It's a color-changing pumpkin full-court media press! The build uses a ShiftBrite RGB LED module, IR receiver, universal remote control, and a PIC18F2550 as the brains of it all.

Make: Halloween Contest 2009

Microchip Technology Inc. and MAKE have teamed up to present to you the Make: Halloween Contest 2009! Show us your embedded microcontroller Halloween projects and you could be chosen as a winner.

Samuel Seide brings us this animatronic talking skull Instructable. It's motion-activated and uses a Waveshield kit for sound. [Thanks, Sam!]

More from Sam Seide:

• Interactive Punch-Out arcade dummy
• Tiny arcade machine is tiny

In the Maker Shed:

Arduino WaveShield Kit

Make: Halloween Contest 2009

Microchip Technology Inc. and MAKE have teamed up to present to you the Make: Halloween Contest 2009! Show us your embedded microcontroller Halloween projects and you could be chosen as a winner.

From YouTuber peaugh. No details on the build, unfortunately. [Thanks, Billy!]

Make: Halloween Contest 2009

Microchip Technology Inc. and MAKE have teamed up to present to you the Make: Halloween Contest 2009! Show us your embedded microcontroller Halloween projects and you could be chosen as a winner.

First up is my "Scariest Pumpkin Ever" build. I had a great time testing this project out on the neighborhood kiddies! HONK! Check out the link for complete build instructions. Just a word of warning, you neighbors are going to hate you! Trust me, I know. A big thanks to everyone who sent me links to your own builds inspired by this project. I really appreciate it!

Next up is my Gakken Mechamo Crab build with a few additional creepy parts. Again, this was a lot of fun to make, and has been very popular when I bring it to Maker Faire. Check out the link for another video of this creepy-crawler in action. Eeeeeeek, eeeek, blip, blip!

My last Halloween inspired build was the Animated Ghost kit from the Maker Shed. It's a really easy kit to make, and it always manages to freak-out anyone that gets too close! Remember, it's never too early to start working on next year's projects!

Speaking of Halloween, don't forget to enter our contest! Do it, or Robot Zombie Cat is going to come after you!

Make: Halloween Contest 2009

Microchip Technology Inc. and MAKE have teamed up to present to you the Make: Halloween Contest 2009! Show us your embedded microcontroller Halloween projects and you could be chosen as a winner.

Sebastian built an experimental record/looper circuit, resulting in some interesting sample contortionism -

This circuit currently has a few ways to manipulate audio. These are:

A record button allows the user to sample incoming audio to a RAM buffer

A potentiometer sets the input level

A potentiometer sets the sample rate / pitch for playback. The changing of sample rate can be recorded if desired, by physically changing the position of the pot during recording.

The address lines A0 - A18 can be manipulated ie. moved around, removed, replaced, giving a wide range of effects such as stuttering, repeating and basic granulation.
Although this does not sound like heaps of manipulation, keep in mind that this circuit can absolutely mangle a sound beyond recognition. The ADC is running at its maximum speed, and as such the sample rate can be varied greatly for example.

MAKE subscriber Ian writes in to share his Halloween project, a remote-control, color changing pumpking. To control the pumpkin, he built an infrared remote decoder, which allows him to use a regular TV remote to change the color of the pumpkin. The project also has an 'angry pumpkin' mode, which flashes a red color to scare away onlookers. Full source code, schematic and writeup are available on his website.