Kristofer S.J. Pister (Advisor)

Research Advised by Professor Kristofer S.J. Pister

Pister Group:  List of Projects | List of Researchers

CMOS Based Chemical Sensors

Dharmesh Bhalchandra Jani
Kristofer S.J. Pister
Detection of chemical species using solid state sensors is of great practical importance. The niche for chemical microsensors exists in places where continuous measurement of a chemical concentration is required from a number of locations. Microsensors...

CotsBots: An Off-the-Shelf Platform for Distributed Robotics

Sarah Bergbreiter
Kristofer S.J. Pister
David Culler

This thesis presents the CotsBots – inexpensive and modular robots built entirely from commercial off-the-shelf components. These robots provide a convenient platform on which to investigate algorithms, cooperation and distributed sensing in large (greater than 50) robot networks. Each robot is small (13cm x 6.5cm base) and costs approximately $200 in quantity. Each is equipped with on-board processing, radio communication, and a base platform...

Crystal-Free Wireless Communication with Relaxation Oscillators and its Applications

David C. Burnett
Kristofer S.J. Pister
Ali M. Niknejad
Lance J. Kriegsfeld

For the last decade, the size of complete 2.4GHz wireless modules containing everythingbut power have stagnated at ~1cm x 1cm. This is despite continued advances in semiconductorprocesses due to components needed by the core communication IC. Breaking this size barrier (which also sets a power and cost barrier) by eliminating all off-chip components is the goal of the Single-Chip Mote project, of which this dissertation is a part. The major componentsto be eliminated are antenna, battery, and crystal...

Articulated Mechanisms and Electrostatic Actuators for Autonomous Microrobots

Richard Yeh
Kristofer S.J. Pister
Roger T. Howe
Dorian Liepmann

Enabled by advances in both integrated circuit technology and micro electromechanical systems (MEMS), the continuing miniaturization and integration of electronics, sensors, and actuators and mechanisms will make it feasible to create insect-sized autonomous microrobots. We propose to create a class of autonomous crawling microrobots the size on the order f 1cm^3 and equipped with a power source, low-power CMOS controller, sensors, wireless communications devices and motorized articulated legs. The work presented here demonstrates how articulated insect legs could be created from rigid...

BPN560: Video Over Wireless Sensor Networks: From Camera to Smartphone

Fabien Chraim
Thomas Watteyne

To this date, Wireless Sensor Networks are still largely characterized by non-intensive applications, which means that they are mainly used to gather relatively small amounts of data. This project aims at pushing the limits of Sensor Networks to the point of transmitting video in real-time. The crucial advancement that enabled this application was the introduction of Time-Synchronized Channel Hopping which made communication more robust on unreliable wireless links. In addition to using the camera as a sensor, this project is concerned with interfacing smartphones with low power...

Gimballed Electrostatic Microactuators with Embedded Interconnects

Lilac Muller
Albert P. Pisano
Roger T. Howe
Kristofer S.J. Pister
A microgimbal with an integrated in-plane electrostatic microactuator was designed, fabricated, and tested. The microgimbal structure provided pitch and roll compliance between the microactuator and ground, and thus offered mechanical isolation from external disturbances, such as vibration and temperature variations. ...

Hinged Polysilicon Structures with Integrated CMOS Thin Film Transistors

Kristofer S.J. Pister
Roger T. Howe
Before Micro Electro Mechanical &stems (MEMS) can achieve their full potential, design tools for these systems must be made available to members of other disciplines, and not restricted only to those with the...

Liquid to Vapor Phase Change in Constant Cross-Section Silicon Microchannels

Brenda Haendler
Albert P. Pisano
Dorian Liepmann
Kristofer S.J. Pister
This paper presents research on the evaporation of methanol/water mixtures in uniformly heated, constant cross-section, serpentine silicon microchannels for potential application as a fuel injection system for a MEMS rotary engine. The phase change of a variety of mixtures of methanol and water was observed, characterized and compared to the phase change both of pure water and pure methanol. Seven different fluids were tested: pure water, pure methanol and five different molar fractions of methanol mixed with water....

Solid Propellant Microrockets

Dana Teasdale
Kristofer S.J. Pister
Albert P. Pisano

This paper details the design, fabrication and testing of millimeter scale solid propellant rockets for use as one-time deployment platforms carrying communication-equipped MEMS sensor systems, known as Smart Dust. Each rocket assembly is an integrated system, incorporating a combustion chamber, composite propellant grain, nozzle, igniter, and thermoelectric power converter. Solid propellant is advantageous for a millimeter-scale single-use device because of its simple implementation, unlike liquid propellants, which...

Algorithms for Position and Data Recovery in Wireless Sensor Networks

Lance Doherty
Kristofer S.J. Pister
Kannan Ramchandran

Networks of hundreds or thousands of sensor nodes equipped with sensing, computing and communicationability are conceivable with recent technological advancement. Methods are presented in this report to recover and visualize data from wireless sensor networks, as well as to estimate node positions. Acommunication system is assumed wherein information from sensor nodes can be transferred to acentralized computer for data processing, though suggestions are made for extensions to distributed computation. Specifically, this...