Sensors

As I have mentioned elsewhere, I am thrilled by the fact that various sensing technologies are getting so cheap that they are incorporated everywhere. As could be seen from the presentation of Apple’s new iPhone, it includes an accelerometer to sense tilt of the device (and also movement if they decide to use that for anything), a proximity sensor (ultrasound?) to turn off the display when the phone is put to the ear and a light sensor to change the brightness of the screen (?). ...

This video shows WiiMote used as a mouse on windows.

A group of German students are working on a project called Stekgreif where they include a number of popular sensors built as lego-blocks. Adding power through the lego bricks makes it possible to build instruments and other fun things entirely out of lego.

{#image292}Nick Rothwell reviews the Gypsy MIDI controller in Sound on Sound. An excerpt from his conclusion: I know some artists who could build great live performances around a Gypsy MIDI suit, and others who would merely look like plonkers. As to the first question, here at Cassiel Central we’ve been through all manner of MIDI controllers and sensing systems, from fader boxes (motorised and not) through accelerometers, ultrasound systems, camera tracking, joysticks, game controllers and Buchla devices, and some common issues emerge. Conventional controllers such as keyboards and mixers have controls which can be physically moved, so that they can be operated by touch and inspected visually. If the controls do not move and offer no visual feedback, then a layer of cognitive support disappears, and one tends to lose accuracy and/or sophistication. If the controls cannot even be seen, then even more accuracy is lost. So, the Gypsy MIDI is always going to be a low-resolution controller compared to traditional devices, but whether this matters depends on what you’re trying to do with it. On the other hand, controlling sound (or for that matter, video) by moving one’s arms and wrists is really rather fun. ...

Last weekend we participated (again) with a stand at a big science fair down in the city centre of Oslo during the Norwegian Research Days. The most interesting thing, and also what I have spent the most time on lately was a “music troll” I have been making together with Einar Sneve Martinussen and Arve Voldsund. The troll is basically a box with four speakers on the sides, and four arms sticking out with heads with included sensors. ...

Nokia 5500 is a new sport phone with a built in pedometer and the ability to use gestures (well, only tapping so far) for controlling music playback. As accelerometers get cheaper I expect to see lots of new gesture-controlled devices.

{.imagelink}Eduardo Miranda and Marcelo M. Wanderley have just released a new book called New Digital Musical Instruments: Control and Interaction Beyond the Keyboard. The chapters are: - Musical Gestures: Acquisition and Mapping Gestural Controllers Sensors and Sensor-to-Computer Interfaces Biosignal Interfaces Toward Intelligent Musical Instruments So far most publications in this field have been in conference proceedings, so it is great to have a book that can be used in teaching.

For some experiments we are conducting on piano playing I have been looking for a way of measuring muscle activity, or electromyography as it is more properly called: Electromyography (EMG) is a medical technique for evaluating and recording physiologic properties of muscles at rest and while contracting. EMG is performed using a instrument called an electromyograph, to produce a record called an electromyogram. An electromyograph detects the electrical potential generated by muscle cells when these cells contract, and also when the cells are at rest. ...

Apple and Nike has teamed up and released the Nike+iPod package, which allows for using an iPod Nano as a pedometer and share the training information online. It is based on a wireless accelerometer (1.37 x 0.95 x 0.30 inches, 0.23 ounce, using a proprietary protocol at 2.4GHz) and a receiver that connects to the iPod (Size: 1.03 x 0.62 x 0.22 inches, 0.12 ounce). Suggested price is US$29, which is very cheap thinking about the included accelerometer.

{.imagelink}The installation Spatial Sounds (100dB at 100km/h) by Marnix de Nijs and Edwin van der Heide. Spatial Sounds 100 dB at 100 km/h was set up at Usine-C during the Elektrafestival. A speaker is mounted on a metallic arm, rotating around at different speeds dependent on the people in the room. Ultrasonic sensors detect the distance to people in the space and changes the sound being played as well as speed of rotation (more technical info here). Sometimes it is moving slowly, but most of the time (probably because there were always quite a lot of people in the space) it is spinning quite fast. A quite simple concept, but it was suprisingly powerful. However, considering the large forces involved, I was mostly thinking about what would happen if the arm broke with all those people around…