sensors for new musical

instrumentsRoberto Aimi

typical controller system

•sensors

•acquisition system (Icube, PIC, Basic Stamp)

•mapping software (Max, PD, ?)

•output(?)

useful resources

•Fraden, a handbook of modern sensors

•MSI piezo manual

•acroname.com, infusion systems ($$$!!!!)

•Datasheets!

other favorite resources

•Digi key

•American science and surplus

•smallparts.com

•Mcmaster-Carr / MSC industrial catalogs

what to sense?

•position, velocity, acceleration, rotation

•temperature, light, sound

•pressure, torque, bending

•ON/OFF

•?

Switches

•discrete output

•toggle, normally on, off

•can provide visual and tactile feedback

The hands -- Michel Waisvisz

1984 - present

Roland TR-808

Potentiometers•common

types: linear taper, audio taper (log)

•rotary, linear, multiturn

+Vref

GND

Vout

Variable resistors

V output

Variable resistor

R2

R1

Vout = Vref R2/(R1+R2)

Bend Sensor

FSR

•resistance drops when pressed

accelerometers

•inclination, acceleration

Rate Gyros

•Analog devices ADXRS410 or similar

•voltage output proportional to angular velocity

IR distance sensors Sharp GP2D12

(AKA the toilet sensor)

http://www.acroname.com/robotics/parts/R48-IR12.html

Qprox capacitive sensing QT301

circuit

PWM to Analog

http://www.tigoe.net/pcomp/analogout.shtml

Devantech SRF04 Ranger(acroname.com)

•pulse length proportional to distance

Hall effectMagnetic field sensors

Allegro 1321 linearamplifier in chip!

Piezoelectric materials

•PZT

•PVDF

excellent drum triggers,

contact microphones

Musical controllers

derived from pianos, organs

Perception-Production loop

Roland V-drums

Drum triggers

Korg Wavedrum

(Physical Modeling)

Typical percussion controller

Simplified convolution instrument

but not too simple...

Simple example

simple drum pad

Some initial results

QuickTime™ and aMPEG-4 Video decompressor

are needed to see this picture.

prototypes