Mse%204001%20 Wireless%20 Optical%20 Mouse


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This presentation is a group collaboration of Joseph Koplar, Tony Tenaglier, Sarah Winiarz, and myself about the technology and history of a wireless optical mouse, created for a course on electronic properties.

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  • Mse%204001%20 Wireless%20 Optical%20 Mouse

    1. 1. Wireless Optical Mouse MSE 4001 December 4, 2008 Joseph Koplar, Tony Tenaglier, Adam Wentworth, Sarah Winiarz
    2. 2. Part 1: History
    3. 3. Reasoning Behind the Mouse <ul><li>Douglas Engelbart’s Augmented Human Intellect: A Conceptual Framework </li></ul><ul><li>Goal of this systematic study was to improve methods for solving problems </li></ul><ul><ul><li>Find specific factors that limit human capability </li></ul></ul><ul><ul><li>To develop new techniques, procedures and systems </li></ul></ul><ul><li>Stated 3 processing capabilities </li></ul><ul><ul><li>Human capability </li></ul></ul><ul><ul><li>Artifact executing process capability </li></ul></ul><ul><ul><li>Combination </li></ul></ul><ul><li>In search for methods to simplify and allow for more complex problems </li></ul>
    4. 4. Evolution of the Mouse 1965 2-wheel analog mechanism (SRI) 1984 Apple Lisa 1 Graphical User Interface Microsoft electro-optical 1999 1966 Orbit X-Y Ball Tracker 1968 Englebart’s NLS (first digital) 1973 Xerox Alto 1981 Xerox 8010 Star First Optical 1991 Logitech MouseMan Cordless 1995 Logitech Trackman Marble (optical) Logitech MX1000 Laser Cordless Mouse 2004 Razer DeathAdder Infrared 2006 Sun Microsystems Laser Mouse Gyration Air Mouse 2001
    5. 5. Douglas Engelbart’s Mouse <ul><li>Invented in the 1965’s at the Stanford Research Institute (SRI) by Douglas Engebart and his colleges </li></ul><ul><li>Composed of a 5-button key pad and a wooden box with two wheels </li></ul><ul><li>Users would input a basic command using the key pad and use the wooden box to point to where on the screen the command was to be executed </li></ul><ul><li>Users had to tilt the wooden box off of one wheel to move it in one direction </li></ul><ul><li>Position was tracked by having the wheels turn variable resistors attached to an analog to digital converter </li></ul>
    6. 6. Early Optical Mice <ul><li>Around 1980, two types of optical mice appeared </li></ul><ul><li>Both required special mouse pads to operate </li></ul><ul><li>One type used multiple IR sensors with a special IR absorbing grid on a mouse pad </li></ul><ul><li>The other used an optical sensor with a patterned mouse pad </li></ul><ul><li>The optical sensor had the advantage of not requiring its orientation to be constant, as it used itself as a coordinate reference </li></ul>
    7. 7. Photo Examples of Early Optical Mice Above: Photos of the Xerox 8010 Star Mouse, one of the first optical mice To the right: The optical sensor in a Microsoft IntelliMouse Explorer v1.0 Above and to the right: One version of the nMOS Sensor used in some of the first optical mice
    8. 8. Mechanical vs. Optical <ul><li>Mechanical </li></ul><ul><ul><li>Inverted trackball </li></ul></ul><ul><ul><li>Moving parts </li></ul></ul><ul><ul><li>Low accuracy </li></ul></ul><ul><li>Optical </li></ul><ul><ul><li>Less mechanical failure, no rolling parts </li></ul></ul><ul><ul><li>No mouse pad needed </li></ul></ul><ul><ul><li>Disadvantages </li></ul></ul><ul><ul><li>Cannot track motion on glossy/transparent surfaces </li></ul></ul><ul><ul><li>Higher power usage, only detrimental to wireless mouse </li></ul></ul><ul><ul><ul><li>Power can be saved when not in use by implementing additional low-power states (standby/sleep) </li></ul></ul></ul>
    9. 9. Innovations: Multimedia & Combination Mouse <ul><li>Additional buttons </li></ul><ul><ul><li>play, pause, forward, back, volume </li></ul></ul><ul><li>Uses a combination of infrared and RF technology for greater range </li></ul><ul><li>Resembles a TV/media player remote with added features of a mouse </li></ul>Eizo C@T – one remote control mouse
    10. 10. Innovations: Gaming Mouse <ul><li>High-precision </li></ul><ul><li>Designed for use with PCs and game controllers </li></ul><ul><li>Multiple buttons for added flexibility and functions </li></ul><ul><li>Motion feedback and two-way communication </li></ul>Logitech G7 Laser cordless mouse
    11. 11. <ul><li>Control mouse pointer by waving the mouse in the air </li></ul><ul><li>Patented by Gyration </li></ul><ul><li>Uses miniature gyroscopes </li></ul><ul><ul><li>track the motion of the mouse as you wave it in the air </li></ul></ul><ul><li>Uses electromagnetic transducer and sensors </li></ul><ul><ul><li>detect rotation in two axes at the same time </li></ul></ul>Innovations: Motion-Based Mouse Gyration ULTRA GT Cordless Optical Mouse
    12. 12. <ul><li>Permit only authorized users </li></ul><ul><li>Integrated fingerprint reader either in the receiver or mouse </li></ul><ul><li>Enhances security and adds convenience </li></ul><ul><li>Software registers finger- prints and stores information about authorized users </li></ul><ul><ul><li>can also encrypt and decrypt files </li></ul></ul>Innovations: Biometric Mouse Wireless IntelliMouse Explorer with Fingerprint Reader
    13. 13. Innovations: Tilting Scroll Wheel Mouse <ul><li>Scroll onscreen both horizontally and vertically </li></ul><ul><li>Scroll wheel is positioned on a combination fulcrum and lever </li></ul><ul><li>Another method involves a touch scroll panel that responds to your finger sliding horizontally and vertically </li></ul>Logitech V500 Cordless Optical Notebook Mouse
    14. 14. Future Outlook <ul><li>Interactive interfaces inspired by gaming </li></ul><ul><li>More intuitive and natural technologies </li></ul><ul><li>Motion-based </li></ul><ul><ul><li>Users movements interpreted as commands </li></ul></ul><ul><li>Touch screens </li></ul><ul><ul><li>Microsoft Surface computer </li></ul></ul><ul><ul><li>Touch screen computers </li></ul></ul><ul><ul><li>HP TouchSmart (above) Microsoft Surface (below) </li></ul></ul>
    15. 15. Future Outlook <ul><li>Facial recognition systems </li></ul><ul><ul><li>Emotiv Epoc headset </li></ul></ul><ul><ul><li>Reads neural activity </li></ul></ul><ul><ul><li>uses 16 electrodes to measure conscious thoughts, emotions, facial expressions and the rotation of the head </li></ul></ul>Thought-Controlled Gaming Headset
    16. 16. Part 2: Optical Components
    17. 17. Optical Mouse Basics <ul><li>First optical mouse to not need a mouse pad was introduced by Agilent Technologies in 1999 </li></ul><ul><li>Light emitting diode (or a semiconducting laser) provides surface illumination </li></ul><ul><li>Complimentary metal-oxide semiconductor (CMOS) sensor images the surface at 1500 times a second </li></ul><ul><li>The images get translated into a signal which is sent to the Digital signal processor (DSP) </li></ul>
    18. 18. Optical Mouse Basics The chip with the CMOS image sensor and associated processing electronics is on the top, the L.E.D. is to the right, and the surface beneath the mouse as the CMOS sensor sees it (although the image would be grey scale) is on the bottom.
    19. 19. Light Emitting Diodes (LEDs) <ul><li>A simple LED is a p-n junction </li></ul><ul><li>LEDs capitalize on a charge carrier recombination effect that is normally undesirable in rectifiers </li></ul><ul><li>The color of light emitted by a LED is dependent on the band gap in the semiconducting material and its overall construction </li></ul>
    20. 20. Light Emitting Diodes (LEDs) To the left is a pictorial representation of the band structure in a rectifier or diode. To the right is an example of how the internal construction of an L.E.D. affects its ultimate output. Although the output from this diode is blue and yellow, humans will perceive this output to be white.
    21. 21. The Semiconductor Laser <ul><li>Introduced to the consumer in 2004, laser mice use a infrared semiconducting laser as a light source </li></ul><ul><li>Lasers are a source of coherent light (in phase with the same wavelength) </li></ul><ul><li>Lasers produce speckle patterns that allow resolving of shiny and glossy surfaces </li></ul><ul><li>Lasers work by using self-generated photons to ‘stimulate’ the production of even more photons </li></ul>
    22. 22. The Semiconductor Laser To the left and right: Speckle Patterns created by lasers
    23. 23. MOSFET Transistors <ul><li>MOSFETs or Metal-Oxide-Semiconductor Field-Effect Transistors are a type of electronic voltage valve </li></ul><ul><ul><li>NMOSFETs feature a n-doped ‘channel’ </li></ul></ul><ul><ul><li>PMOSFETs do not have a ‘channel’ </li></ul></ul><ul><li>Both types use an applied electric current between the gate and base to change the charge carrier concentration in the vicinity of the source and drain </li></ul><ul><li>These two devices together create CMOS technology </li></ul>
    24. 24. CMOS Imaging <ul><li>CMOS technology is used for its low power consumption, heat dissipation, and has the sensor and related processing electronics on one single chip </li></ul><ul><li>To be an optical sensor, part of either a NMOSFET or PMOSFET component is used as a photodiode </li></ul><ul><li>A photodiode can be thought of a reverse L.E.D. where current is generated when it the diode is exposed to light </li></ul><ul><li>Commonly, the photodiode is a thin, transparent layer of p-doped semiconducting material on top of a n-doped layer inside a p-doped semiconducting material </li></ul><ul><li>The output from the photodiode can be amplified inside the pixel in what is called an “active pixel” </li></ul><ul><li>Optical mice typically employ a 18 by 18 pixel sensor to take low-resolution, grey-scale images of a surface </li></ul>
    25. 25. CMOS Imaging Above: An advanced CMOS Sensor from IBM, Note the color filters Left: Typical Images from Optical Mice CMOS Sensors Right: The Photodiode Junction commonly found in CMOS Sensors
    26. 26. DSP (Digital Signal Processing) <ul><li>CMOS sends image to DSP </li></ul><ul><li>DSP detects changes in patterns between movements </li></ul><ul><li>DSP then calculates how far the mouse has moved using a coordinate system </li></ul><ul><li>This process occurs over 1,000x a second so it appears to be relatively smooth </li></ul>
    27. 27. Buttons/ Wheels/ Motion Translated into Signals How one parameter depends on another parameter.
    28. 28. Histogram/PMF (Probability Mass Function)/ PDF (Probability Density Function) <ul><li>Histogram </li></ul><ul><li>Displays the number of samples at a particular value. </li></ul><ul><li>PMF </li></ul><ul><li>Estimation based upon the histogram. </li></ul><ul><li>PDF </li></ul><ul><li>Shows that the signal can take on a continuous range of values. </li></ul>
    29. 29. Accuracy and Precision <ul><li>Ways to describe the error. </li></ul>
    30. 30. DSP Steps DSP DSP Architecture
    31. 31. DSP <ul><li>Main use is to convert the signals to digital forms through algorithms. </li></ul><ul><li>Separates information from background noise. </li></ul><ul><li>Has the possibility of reprogrammable hardware. </li></ul><ul><li>Conveying information is more reliable with minimum noise effects. </li></ul>Advantages of DSP
    32. 32. What does all of this mean for Material Scientists? <ul><li>Use of semiconductor applications. </li></ul><ul><li>Transistors and capacitors to perform the needed tasks the electrical engineer desires. </li></ul>
    33. 33. Part 3: Wireless Technology
    34. 34. <ul><li>Uses some form of energy (radio frequency (RF), infrared light, laser light, etc.) to transfer information without the use of wires. </li></ul><ul><li>Telecommunications </li></ul><ul><li>TV/ Gaming controllers </li></ul><ul><li>Radios </li></ul><ul><li>Satellite TV </li></ul><ul><li>Bluetooth </li></ul>Wireless Applications
    35. 35. How Wireless Works <ul><li>Information transmitted without wires using radio frequencies (RF) </li></ul><ul><li>Requires two components </li></ul><ul><ul><li>Transmitter  sends radio signal to receiver </li></ul></ul><ul><ul><li>Receiver  accepts signal from transmitter, decodes signal and sends to computer </li></ul></ul>Transmitter (inside mouse) Receiver (connected to computer)
    36. 36. <ul><li>Wireless communication spans the spectrum from 9 kHz to 300 GHz </li></ul><ul><ul><li>1 Hertz is equal to 1 cycle/period per second </li></ul></ul><ul><li>Wireless mice commonly operate with RF types 802.11b or 802.11g </li></ul><ul><ul><li>Standards set by IEEE (Institute of Electrical and Electronics Engineers) for wireless networking </li></ul></ul><ul><li>Use 2.4 GHz frequency </li></ul><ul><ul><li>Stable </li></ul></ul><ul><ul><li>Rapid transfer of data (6.5 - 11 Mbps) </li></ul></ul><ul><ul><li>Ability to travel through walls </li></ul></ul><ul><ul><li>Lack of interference from other household appliances </li></ul></ul>Frequency
    37. 37. Radio Frequencies, Wavelength, and Applications Image:
    38. 38. <ul><li>Process by which the wireless transmitter </li></ul><ul><li>and receiver are coordinated </li></ul><ul><ul><li>Manual or automatic process </li></ul></ul><ul><li>Requires operating at same frequencies on same channel using same identification code </li></ul><ul><li>Used to eliminate interference </li></ul>Pairing
    39. 39. <ul><li>Allows synchronization of up to 8 devices at once @ 2.4 GHz </li></ul><ul><li>Transmission speeds up to 2.1Mbps (for version 2.0) </li></ul><ul><li>Shorter range (~33 feet) compared to RF mouse (100-150 feet) </li></ul><ul><li>Designed for low power consumption </li></ul><ul><ul><li>Can increase wireless mouse/keyboard battery life by 3-10X. </li></ul></ul>Bluetooth
    40. 40. Bluetooth Security <ul><li>Utilizes frequency hopping </li></ul><ul><ul><li>Data is “chopped up” and sent over 79 different channels (1MHz wide each) to prevent hacking </li></ul></ul><ul><li>Users can establish “trusted devices” that can exchange data without asking permission </li></ul><ul><li>If another device tries to establish a connection, the user has to decide to allow it </li></ul>
    41. 41. Signal/Noise Ratio <ul><li>When transmitting a signal, a wave is created by the emitter with a certain frequency as seen before. </li></ul><ul><li>A receiver will “hear” this wave, decode it and send the signal to be processed. </li></ul><ul><li>Transmitting a signal over double the distance will produce a wave with ½ the amplitude, and amplification is </li></ul><ul><li>needed. </li></ul>
    42. 42. <ul><li>However, the more amplification you need, the more noise will appear in the signal, until a clear signal is not identifiable. </li></ul><ul><li>To fix this problem, the periods of the known wave are precisely “cut up” and summed together. </li></ul><ul><li>The parts of the signal that are of the emitted wave will sum all positive or negative while the noise is random, (i.e. sometimes positive, sometimes negative) and will cancel out when summed. </li></ul>
    43. 43. <ul><li>Once the signal is summed, it is divided by the number of periods n that were summed to provide a clearer signal. </li></ul><ul><li>When you sum n periods, the signal to noise ratio increases by a factor of √ n . </li></ul><ul><li>Transmitters and receivers must therefore run at the same frequency and be equally precise to effectively sum the same period of the wave and produce a meaningful result. </li></ul>Same frequencies Different frequencies (sum ≈ 0)
    44. 44. Questions??