The edgetrimmer/DAMPER interface now has a pair of wooden handles. These replace the large ungainly metal poles that were used in the earlier prototype. The new handles are shorter than the old, so that the interface can exert greater force upon the user. Also, due to being wooden it should prove easier to attach sensors.
Have just been playing with the new gyro-enabled SHAKE devices. These are small matchbox sized units that contain 3-axis accelerometers, magnetometer, and now also gyro’s for measuring angular rate. Also included is a 3-way rocker switch, two capacitive sensors and two pager vibration motors. All of the data is sent over a bluetooth serial connection to the laptop. Currently I’m using Processing to parse the serial stream and also to create a basic display to show the readings. This is shown above; from left to right you’ve got the two capacitive sensors, the acceleration, gyro’s, magnetometer and then compass heading which is calculated in hardware and sent over (unfortunately at a rather slow rate).
The next step is to update the code for the air-scratch interface, so that you can scratch a sample any-which-way…
Ok, here’s the first real prototype of the edge-trimmer, which is a little more solidly constructed than the chair leg version… It currently isn’t hooked up to make any noise, although it has been tested with an unmodulated damping force. It’s pretty heavy, so it looks like it may have to be used in a similar manner as a cello and rest on the ground or a convenient table. As it doesn’t have a built in resonance chamber, a table would be useful in amplifying the sound produced.
Just started a prototype of a new interface. A ‘Shake’ device containing accelerometers, magnetometers, bluetooth and capacitive sensors is strapped to the center of a 10″ record, allowing the user to perform vertical wireless scratching… At the moment the angle of rotation is computed as shown in the animation, but currently this isn’t hooked up to the circular sound-wave shown above. More to follow soon.
A very very rough prototype of a new instrument which may resemble an edge-trimmer has been made. So far this consists of an ergonomic handle (not a chair-leg!) connected to a magneto-rheological-fluid brake controlled by an Arduino board. Basically, the brake is switched on and off rapidly causing the handle to vibrate when pushed back and forth. A potentiometer connected to the Arduino allows the user to simultaneously change the frequency of the pulses, and hence the pitch of the note produced.
The next step is to attach two real handles, so the user can use both hands.