Droplet photography (link translated from French) often produces simple and beautiful images, but timing the exposure can be tricky. Snapping the photo too early or too late can cause you to miss the action, which only lasts a fraction of a second. EquinoxeFR (the people behind the Asus WL500GP audio hack) came up with a solution to this problem using a circuit with an ATmega168 running an Arduino environment. The circuit controls a syringe that contains a liquid and is triggered remotely to release a drop into a darkened chamber. A camera with the shutter open is attached to the chamber, and before the droplet hits, it crosses an IR sensor that triggers the flash to go off a few milliseconds later, capturing the unique crown shape of the impact. No schematic is available as yet, but comments at the bottom of the post suggest one will be coming soon.
Arduino Hacks3047 Articles
GPS Logging Arduino Shield
ladyada continues to produce more and more interesting Arduino shields. This new GPS logger plugs into a standard Arduino board and has support for four different GPS receiver modules. On the backside of the board is an SD card slot where it stores the coordinates in a text file. The total runtime can vary from five hours to twenty depending on how you choose to power the device and how you use the device. How often you read the device and whether you maintain the GPS lock will affect the power consumption. Like all of ladyada’s projects, you’ll find a great construction guide and example code on her site.
AirPiano: Touch Free IR Piano
[youtube=http://www.youtube.com/watch?v=Gh4Ovsh2DZY&hl=en&rel=0&color1=0x3a3a3a&color2=0x999999]
We were excited to learn of [Omer Yosha]’s AirPiano, but being the persnickety nerds we are, we think its more like a theremin than a piano. The device lets users play 24 different notes with a wave of the hand over the AirPiano. The “keys” are arranged in a matrix of three tiers with eight notes per tier; if the user sustains his or her hand over the AirPiano, the corresponding note is sustained.
It’s construction is relatively simple: an Arduino, several infrared sensors, and LEDs corresponding to the notes make up the device. It doesn’t have any built-in audio hardware at all, so it’s most basic use is as a MIDI controller. Still, it is essentially an unspecified input device, so it could theoretically be used for other purposes. For us, it’s fun to just watch the AirPiano in action.
DuinoStamp
We think that in honor of the DuinoStamp’s small size and big power, the post about it should also be small and powerful. About the size of 34-pin DIP, the DuinoStamp is a breakout board that fits in DIP sockets and is Arduino compatible. It features an ATmega 168-20PU chip, a 16MHz resonator, decoupling capacitors and more. It doesn’t come with the necessary 5V power supply or any kind of interface cable, but what do you expect for under $10?
Arduino Environment On ATmega644
Our friend [Zach Hoeken] at NYC Resistor is porting the Arduino environment to an ATmega644 chip. This doesn’t really add new functionality to the ATmega644 as it is already fully programmable, but it does add a user-friendly and familiar environment to the ATmega, allowing users to build their Arduino-based projects with more powerful hardware. The ATmega is, after all, the biggest DIP package AVR makes, featuring 64k flash and 4k RAM (both four times as much as an Arduino) and 32 I/O pins, which is 12 more than an Arduino. The video is only proof of concept, so we will let you know when [Zach] releases more details.
[via NYC Resistor]
Twittering Teddy Bear
This may be the deathblow that kills Nabaztag: using text-to-speech software, this animatronic bear speaks a Twitter stream aloud and in real time.
The gurus at My Home 2.0 made the bear talk by replacing its integrated circuit board with an Arduino loaded with custom software. A Bluetooth audio adapter was added as a channel for the bear’s voice, and a circuit with an H bridge chip was added to address power issues. The Arduino translates the income audio signal into movement. From there the process moved to the computer that feeds the bear audio data, they parse the Twitter stream and use OSX’s built in “say” command to generate the voice stream that’s sent to the bear via Bluetooth.
Giant Fabric Keyboard
[ladyada] pointed us in the direction of this giant fabric keyboard built by [Maurin Donneaud]. The construction of it looks fairly simple, like the buttons used in [fbz]’s WiFi detecting backpack strap, but on a larger scale. We’ll take you through its construction, pictures and all, after the break.
