Brochure
Technical Papers
Sickel, J. Levitating Across the River Styx. In: Proceedings of the 4th International Workshop on Plan 9 (IWP9), 21-23 Oct. 2009, Athens, Georgia.
Abstract:
The Styx (9p) protocol has been well documented for use in various distributed systems. Demonstrations have proven that it works for communication with embedded devices. This paper presents an implementation of 9p for the 16-bit dsPIC33 family of digital signal controllers. It is used to collaborate multiple distributed nodes to achieve stable aero-acoustic levitation of a sample by tuning sound pressure levels and managing spin control.
Sickel, J. and Nordine, P. Effective Resonant Frequency Tracking with Inferno. In: Proceedings of the 5th International Workshop on Plan 9 (IWP9), 11-13 Oct. 2010, Seattle, Washington.
Abstract
We describe a digital technique for tracking the resonant frequencies of
piezoelectric transducers used to drive an aero-acoustic levitator.
Real-time sampling of the voltage and current phase difference is used in a
low-priority feedback loop to control drift and stabilization.
The implementation leverages 9p on embedded 16-bit dsPIC33F digital signal
controllers. Data collection and processing are performed with various 9p
clients. This paper describes the use of 9p and Inferno to track, adjust, and
optimize output frequency and sound pressure levels on the instrument.
Sickel, J. To Stream or not to Stream. In: Proceedings of the 6th International Workshop on Plan 9 (IWP9), 20-21 Oct. 2011, Madrid, Spain.