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Articles 1 - 30 of 48
Full-Text Articles in Engineering
Application Of Wireless Power For Charging The Battery Of A Wireless Mouse, Jacob Keast, Vincent Jison
Application Of Wireless Power For Charging The Battery Of A Wireless Mouse, Jacob Keast, Vincent Jison
Electrical Engineering
Electronic devices are a part of all modern homes, but restricted by available outlets and the hassle of wires. With the modern wireless mouse, this is also the case. When the battery is low the consumer has several options: it is replaced with a new battery, it can be recharged using a USB wire, or the mouse is placed on a charging dock. This project provides an alternative to these options and allows the mouse’s battery to be charged via wireless inductive coupling. The wireless power charging system that was implemented in this project was successful in its ability to …
Energy Harvesting Of Human Kinetic Movement, David Marusiak, Julia Carrillo
Energy Harvesting Of Human Kinetic Movement, David Marusiak, Julia Carrillo
Electrical Engineering
Development of kinetic energy scavenging applications from the human body necessitates additional research to assist in designating a mounting position for a potential device. A data acquisition system adequately provides a parametric average power comparison among four locations on the body (waist, upper arm, hand, and calf) for both a male and female subject. Experimentally, the hand-held device provided the highest average power. Thus, subsequent investigation at set speeds provides further analysis of the output’s characteristically linear behavior. The physical energy-harvesting device features a plastic tube casing wrapped with the stationary coiled wire through which a neodymium magnet oscillates. While …
Single-Phase High Efficiency Motor Testing, Marc Henry Perez
Single-Phase High Efficiency Motor Testing, Marc Henry Perez
Electrical Engineering
A three-phase induction motor has higher efficiency than the single-phase motor counterpart. It is possible to run a three-phase motor with a single-phase source to develop a single-phase high efficiency system. The single-phase high efficiency motor, or SHE-motor, uses capacitor banks to operate at a balanced three phase induction motor using a single phase source. Unfortunately, this design has been limited, as it can only be balanced for one load configuration at a time. This provides the system to have maximum system performance. Due to this limitation in operations, it has proven to be non-ideal in commercial applications. It is …
Active Diesel Soot Measurement By Laser Opacity, Jonathan Audish, Brian Ko, Edward Ma, Travis Mcdaniel
Active Diesel Soot Measurement By Laser Opacity, Jonathan Audish, Brian Ko, Edward Ma, Travis Mcdaniel
Electrical Engineering
This project looks into understanding the concentration of soot being omitted by a diesel engine through the creation of an innovative opacity sensor. The system contains a receiver circuit implementing a photodiode, laser with wavelength of 405±10nm, and a microcontroller with analog-to-digital (A/D) converter. As the laser pulsates, the microcontroller collects and processes the data to calculate the amount of soot within the exhaust system. The opacity sensor in our tests will be used on an Isuzu 1.9 liter diesel engine. The elegant design of the system can be integrated into conventional manufacturing molding or casting processes for new exhaust …
Radio Link Analysis And Characterization Of Past And Future Cal Poly Cubesats, Brian Gilbert Tubb
Radio Link Analysis And Characterization Of Past And Future Cal Poly Cubesats, Brian Gilbert Tubb
Electrical Engineering
Cal Poly's satellites design team, PolySat, has three satellites in Low Earth Orbit (LEO) and four more planned to launch within the next two years. Radio communication of past and current orbiting satellites has been an exercise in frustration, prompting significant research into the satellite-side of the radio link by several other Senior Projects and Thesis papers. However, minimal effort has been spent on evaluating why these problems were discovered only once the satellites reached orbit. This paper details the downfalls of relying heavily on link budgets and improper long range test setups, then experimentally determines the sensitivity of PolySat's …
Residential Grid-Tied With Battery Backup Photovoltaic System, Thomas Stobuagh
Residential Grid-Tied With Battery Backup Photovoltaic System, Thomas Stobuagh
Electrical Engineering
When power outages occur, many homes are left without power for some time as they are dependent on the power grid. This project aims to design a residential grid tied battery backup photovoltaic system that will provide up to 7.2kW in an area that gets 5.36-5.49 kWh/m2/day [1] to support a home with an average daily usage of 28.4 kWh/day. To effectively use this system the house remains connected to the electric utility at all times, so any power needed above what the solar system can produce is simply drawn from the utility. It includes battery backup or uninterruptible power …
Water And Energy Conservation Grow System: Aquaponics And Aeroponics With A Cycle Timer, Roger Hancock
Water And Energy Conservation Grow System: Aquaponics And Aeroponics With A Cycle Timer, Roger Hancock
Electrical Engineering
What some experts call the “blue gold”; water is a major issue in this world. There is only so much water and the reliability and cleanliness of water is what many developing countries are dealing with today. Countries around the world are facing problems with reliable water to grow enough food for their villages and homes. Is there is a way to minimize water consumption while optimizing growth in plants for food? One solution can be seen through both Aeroponics and Aquaponics. This project explores the potential of providing larger quantities of food to areas where water may be in …
Optical Mode Study Of Galium Nitride Based Laser Diodes, Douglas Cattarusa
Optical Mode Study Of Galium Nitride Based Laser Diodes, Douglas Cattarusa
Electrical Engineering
This paper focuses on the optical mode analysis of laser diodes to improve light emission. Under the mode analysis, we compare the optical confinement factor (OCF) percentage of the emitting light from the LDs. There are two structures which we analyze: a basic GaN waveguide structure and an InGaN waveguide structure. The second structure has additional InGaN waveguides and is analyzed under two additional design variations: the concentration of Indium and the thickness of the top waveguide layer. The results of this study indicate introducing InGaN waveguide layers correlates with lower order modes (zero and first order) and increase the …
3.5 To 30 Mhz Automatic Antenna Impedance Matching System, William Blodgett
3.5 To 30 Mhz Automatic Antenna Impedance Matching System, William Blodgett
Electrical Engineering
Two-way communications using 3 to 30 MHz, high-frequency (HF) radio, also known as shortwave radio, provides worldwide coverage with no infrastructure required between stations. Amateur or “Ham” radio operators apply this advantage to long distance communications and to provide disaster relief communications. Optimum frequencies for long distance propagation are time-of-day variant necessitating an operating frequency range of 3 to 30 MHz. HF half wave dipole antenna length varies from 15 to 150 ft over this range. Fixed-length antenna impedance varies with frequency due to physical dimension dependent capacitance and inductance. Maximum transmitter to antenna power transfer occurs when the transmission …
Iphone Breathalyzer: Point Oh Wait!, Gurpal Bhoot
Iphone Breathalyzer: Point Oh Wait!, Gurpal Bhoot
Electrical Engineering
This final year project combines hardware and software components to create an alcohol breathalyzer that is compatible with the iPhone. The final design of the circuit and the iPhone application is original and combines multiple components to create the final product. Most of those components are seen in a simplified version of a breathalyzer, while the added components take care of the interface to the iPhone.
High Efficiency Audio Amplifier, Grant Moore
High Efficiency Audio Amplifier, Grant Moore
Electrical Engineering
This project combines the advantages of high efficiency of power electronics with the existing high fidelity of audio amplifiers. The result will be functionally equivalent to existing amplifiers but will use considerably less energy. A complete system was designed, simulated, built and tested in a period of three quarters. The end result is an amplifier that functions, but would not be suitable for commercial marketing. Suggestions to improve the performance are provided.
Portable Solar Powered Charging Station, Jordan Bonner
Portable Solar Powered Charging Station, Jordan Bonner
Electrical Engineering
The portable solar powered charging station uses a solar powered mat that can be folded for portability. The device has the ability to charge small electronics during both day and night. When sunlight is available, the charger charges two C batteries in series and at the same time it charges any electronic device that can be connected via USB or cigarette lighter. At night the charger will charge the same electronic devices from the onboard batteries. The charging station must be able to interface with electronic devices using USB and a car cigarette lighter to charge the device’s battery.
Pulsed Class-G Rf Amplifier System, Kevin Maulhardt, Kevin Haskett
Pulsed Class-G Rf Amplifier System, Kevin Maulhardt, Kevin Haskett
Electrical Engineering
No abstract provided.
Printed Electroluminescent Display, Christopher (Chris) James Nixon, Veronica Kopp
Printed Electroluminescent Display, Christopher (Chris) James Nixon, Veronica Kopp
Electrical Engineering
Electroluminescent displays are part of an emerging technology known as printed electronics. Most identify printed electronics with purely electronic purposes such as the Radio frequency identification (RFID). Now the electronics and graphic communication industries have come together to create of new forms of products that interact with customers. Flexible, electronic circuits use functional inks and traditional printing methods such as screen printing, gravure, and inkjet. Printed electronics are perfect for low performance applications, such as displays, labels, clothing and batteries. This paper focuses on creating an interactive electroluminescent (EL) display. In selling a product, displays are important because most customers …
12 Volt Wall Outlet For The Dc House Project, Dylan Van Lant, Chenxi Zhang
12 Volt Wall Outlet For The Dc House Project, Dylan Van Lant, Chenxi Zhang
Electrical Engineering
The purpose of this project is to build a DC-DC converter for the wall outlet of the DC House. This report focuses on the development of the DC -DC converter, and explains the design process as well as summarize the final results. The proposed system using the Buck or Step Down topology takes input voltage of 48V and output 12V at 100W. Results show the ability of the converter to fulfill such tasks while maintaining efficiency about 90% at all load.
Dc House Model Design And Construction, Mark Cabaj
Dc House Model Design And Construction, Mark Cabaj
Electrical Engineering
Approximately 1.6 billion people currently live without electricity. The only sensible solution to their energy problems is the use of renewable energy in an off-grid, autonomous home which is powered directly by direct current, rather than alternating current coming from a power line, which probably cannot be found nearby. The purpose of this project is to construct a prototype of the DC House. More specifically, this project focuses on the development and construction of the power distribution system of the DC House. The system will be put in place starting from the source side model down to the load side …
An Overview Of Binary Arithmetic Architectures & Their Implementation In Dsp Systems, Joseph Waddell
An Overview Of Binary Arithmetic Architectures & Their Implementation In Dsp Systems, Joseph Waddell
Electrical Engineering
This project gives looks at different binary adder and multiplier architectures and how they are implemented in a DSP system as a digital filter. Testing is performed in the Digilent Nexys2 FPA board and filters are implemented using various realizations including normal direct form I and cascade direct forms I and II. Signal filtering is performed in real time at various frequencies and results are provided on an oscilloscope and with a stereo speaker.
"Auto-Tuned" Stereo, Daniel Montes
"Auto-Tuned" Stereo, Daniel Montes
Electrical Engineering
The purpose of this project is to determine the capability of introducing delay and gain to audio signals to synthesize a “tuned” experience. The project uses audio operational amplifiers, field effect transistors, a class D amplifier, microphones, speakers, a 32-bit microcontroller for design and testing. When implementing the MOSFET into the all pass filter, the phase delay occurs by varying the transistor resulted in minimal change in phase. MOSFETs are used as variable resistors to vary the phase change and gain. By modifying the gain the synthesized distance from each speaker can be adjusted. Varying the phase change provides the …
Gamecube To Nintendo 64 Controller Converter, Andrew Jia-Haur Lee
Gamecube To Nintendo 64 Controller Converter, Andrew Jia-Haur Lee
Electrical Engineering
No abstract provided.
Compulsator Design For Electromagnetic Railgun System, Bryan Bennett
Compulsator Design For Electromagnetic Railgun System, Bryan Bennett
Electrical Engineering
This project designed, fabricated, and partially tested a compensated pulsed alternator (compulsator) to power an electromagnetic rail gun (EMRG) in a multidisciplinary team. The EMRG team includes two master’s AERO students, two senior EE students, and three senior ME students. Design of the compulsator began with research through conference and research papers. This design was changed throughout the project as system analysis and component testing exposed unforeseen system limitations. While original specifications were not met, all fabricated components but one, the stator, were completed using Cal Poly’s facilities and the project’s limited available budget. Experimental verification of calculations and system …
Ignitron Trigger Circuit, John F. O'Hara Iii
Ignitron Trigger Circuit, John F. O'Hara Iii
Electrical Engineering
No abstract provided.
Ultra-Capacitor Based Electric Bicycle Regenerative Braking System, Alex C. Bronstein
Ultra-Capacitor Based Electric Bicycle Regenerative Braking System, Alex C. Bronstein
Electrical Engineering
An experimental regenerative braking system was designed and installed on an electric bicycle. The braking system relies on electric double-layer capacitors (EDLC), also known as ultracapacitors, to store the braking energy from the electric bicycle hub motor.
Hearst Hydroelectric Generation Facility, Anthony Schifano, Richard Wright, Nick Buchanan, Corey Nakai, Joshua Rutheiser
Hearst Hydroelectric Generation Facility, Anthony Schifano, Richard Wright, Nick Buchanan, Corey Nakai, Joshua Rutheiser
Electrical Engineering
This project proposes a power plant design that provides a supplemental source of electricity for appliances, machinery, and lighting at Hearst Castle and Ranch. The design concept includes a turbine-generator combination to convert kinetic and gravitational potential energy from the existing water distribution system to electrical energy: also known as a hydroelectric plant. The electrical distribution system from the plant to the local grid takes advantage of power flow techniques utilized in current research and industry.
802.15.4 Low Intermediate Frequency Radio Receiver, Sanjay Avasarala
802.15.4 Low Intermediate Frequency Radio Receiver, Sanjay Avasarala
Electrical Engineering
This project involves the design, building, and testing of a low intermediate frequency 802.15.4 receiver that uses an FPGA to perform final demodulation to baseband.
Cell Phone Charger For The Dc House Project, Andrew Hefner, Antonio Magdaleno
Cell Phone Charger For The Dc House Project, Andrew Hefner, Antonio Magdaleno
Electrical Engineering
The goal of this project is to create a multiple output cell phone charger for the DC House project. The cell phone charger is essentially a DC-DC converter. The converter takes an input of 48 volts from the outlet in the DC House and decreases the voltage level to 5 volts; the input voltage level of all cellular devices. By designing an isolated flyback converter with initial specification in LTSpice simulation software, a converter was created. By monitoring the input and output voltage and current using the multi-meters and electronic load, we determined the charger to be 71% efficient when …
Rfid Check-In System For Safe Routes To School At Hawthorne Elementary, Paul Banel
Rfid Check-In System For Safe Routes To School At Hawthorne Elementary, Paul Banel
Electrical Engineering
The system uses a low frequency Radio Frequency Identification (RFID) reader and passive RFID tags to help the Safe Routes to School program at Hawthorne Elementary in San Luis Obispo track the number of children who participate in the program. Children will carry passive RFID tags and scan them at the reader each morning that they walk or bike to school. The system tracks the total number of students that walk and bike each day, as well as the number of times each individual child participates over the course of many days. The Safe Routes program hopes to use this …
Human Powered Generation - Seesaw: A Dc House Project, William Varsh, Jeffrey Healy
Human Powered Generation - Seesaw: A Dc House Project, William Varsh, Jeffrey Healy
Electrical Engineering
This project is a proof of concept work, where playground equipment is implemented for power generation. In using a seesaw design, this project was able to show how a simple mechanical motion could be transformed in electrical power. A seesaw power generator was designed and constructed to demonstrate its feasibility. Results show that with some modification and improvement to the current design, the seesaw me indeed provide a viable method to produce electricity.
All-In-One Aprs Transmitter, Justin Kenny
All-In-One Aprs Transmitter, Justin Kenny
Electrical Engineering
The Automatic Packet Reporting System (APRS) is a digital radio system that allows transmission of data using an analog FM radio link. APRS allows position, brief messages, and other data to be distributed across a network, independent of infrastructure, making it ideal for applications such as search and rescue, asset management, and event tracking, while maintaining low cost and operating even when cellular and internet services are unavailable. This project encompasses the design, build, and test of a compact, low-cost APRS transmitter, which will include a 5W radio, GPS, and LCD-based user interface, to allow full utilization of APRS.
Digital Graphic Equalizer Implemented Using An Fpga, Anthony Giardina
Digital Graphic Equalizer Implemented Using An Fpga, Anthony Giardina
Electrical Engineering
A graphic equalizer is a device that adjusts the tonal quality of an audio signal. When sound is converted from a digital format to analog sound waves, there are amplification and transducing steps in-between the two formats. Common devices to perform these tasks are speakers, amplifiers, DACs, etc. Many of these devices exhibit a non-uniform frequency response over the range of human hearing. Thus, it is possible that certain frequency ranges of the audio signal will be amplified and others will be attenuated. To counteract this, an audio equalizer can be used to boost and attenuate certain frequency ranges within …
Hardware And Software Study Of Active Noise Cancellation, Riggi Aquino, Jacob Lincoln
Hardware And Software Study Of Active Noise Cancellation, Riggi Aquino, Jacob Lincoln
Electrical Engineering
Noise cancellation involves removing an unwanted noise while keeping the source sound. The source sound may consist of speech, music played from a device such as an iPod or a computer, or no sound at all. The objective of this project is to study the process of noise cancellation both as hardware and as software. The hardware will consist of building a noise cancelling circuit that uses headphones as an output, a microphone to pick up the noise to be cancelled and, if desired, a source sound. The software portion of the experiment will use MATLAB to simulate the hardware …