Force feedback pneumatic prototype for Lyta
These notes are going to be quite brief for the time being, relative to what we have learned, but will endevour to place more complete rendition here in the near future.
Images
Movies:
Experiential Notes
Design prototypes force feedback.
Sense touch pressure at each taxel (tactile pixel).
Transmit touch to opposing taxel..
Force may be conveyed rigidly or compliantly by opposing taxel.
Opposing taxel extends significantly (by up to 7 cm or so).
Touched taxel relaxes to an equilibrium position.
A surprising range in the quality of response is possible, depending on:
Hardware configuration (air pressure, leak rate, spring stiffness)
Software settings (response shape, response time, relaxation time)
Prototype system response time limited by:
Serial communication rate with Atmel micro.
Prototype protocol inefficiencies.
Actuator response rate, which depends on:
Sound
A relatively high-frequency noise is produced
For fixed hardware, this depends on: air pressure, leak rate, valve state
Amount and quality of the noise which is produced depends heavily on the shape of the leaking valve, and on any materials which may be near to it.
Technical Notes
Actuators
Control heirarchy
Mini control board with electronics (Merlin)
8-bit microprocessor (Atmel)
Serial connection to PC (Keyspan USB serial adapter)
ASCII command protocol over RS232.
Responsive interaction design (Max/MSP)
Sensors
Other
Dimensions