Grading criteria

• High fidelity transmission over a range between 5 and 20 feet without any adjustment to the electronics (i.e. potentiometers)
• Professional looking pacakage and has all of the 'bells and whistles' described above like battery indicator lights, on/off switch, etc.
• The system operates for at least 2 hours

• High fidelity transmission over a range between 5 and 20 feet without any adjustment to the electronics (i.e. potentiometers)
• The system operates less than 2 hours, does not have a professional looking packaging, or is missing the 'bells and whistles'

• High fidelity music transmission but don't meet any other requirements

Project plan

• This milestone will NOT include a presentation.
• The report will include the Functional Specification Document (FSD).
• The report should provide an overview of the system with a block diagram.
• It should also include a test plan. The test plan will describe how the various sections of the project will be tested.
• The report must also include measurement of the various components that were provided to you. The set of measurement should include at least the following.
• Voltage level of the digital-to-analog converter output
• Bit rate of the digital-to-analog converter output
• Rise and fall times of the digital-to-analog converter output
• Measured laser power as a function of supplied current (with a maximum current of 30 mA)
• Minimum spot size vs. distance and corresponding beam divergence
• Remember that you should adjust the lens for each distance
• Be sure to explain what you designate as spot size
• The output current of the photodetector as a function of optical input power. You will use your laser to make this measurement.
• Estimate of the amount of optical power that will be received by the photodetector at 5 feet and 20 feet and the current that will be produced by the photodetector
• Required input voltage levels for analog-to-digital converter
  
• It should also include a description of the different roles of the various members of the group.

1st Design Review

• The report should be a self contained document.  It needs to include a brief overview of the system, specifications, and current status of the project.
• The Concept Generation and Selection Document will have already been turned in to Doug Clifford, but it should also be incorporated into this report.
• Demonstrate that the digital output of the DVD player can be plugged directly into your laser driver and produce an optical signal that matches the shape of the DVD’s digital output. The laser driver needs to be built using discrete components. (You cannot buy a laser driver board.)
• The report needs to contain a project schedule.
• The milestone should also include a design of the receiver. You need to estimate the required gain of the receiver.

2nd Design Review

• The report should be a self contained document.  It needs to include a brief overview of the system, specifications, and current status of the project.
• There must be enough measurements in the report to verify that your complete system is working but the packaging does not need to be in teh final 'professional looking' form. 

• At the completion of this milestone the system must take the analog signal out of a portable audio player, convert it into a modulated optical beam, transmits it through space, and demodulate the signal to be heard on a speaker over a distance of 20 feet 
• Sufficient dynamic range to operate at either 5 feet or 20 feet 
• A plan to fit the systems into the webcam packages. 
• The complete system is due early in the semester to allow you enough time to transfer your receiver and transmitter onto circuit boards. If you desire you can have a commercial board fabricated. Details on this will be discussed later in the semester.

Final Demonstration

• At the completion of this milestone the system must take the analog signal out of a portable audio player, convert it into a modulated optical beam, transmits it through space, and demodulate the signal to be heard on a speaker over a distance of 20 feet 
• The system will first be set up with a separation distance of 5 feet and then moved to a distance of 20 feet
• The system will then be left to play until the music is no longer clear.

• The system will be judged to ensure that it is professional looking and contins the required 'bells and whistles'
  

• The specification document should be a one page document with any necesary specifications

• The operating manual should be clear enough for someone unfamiliar with you rsystem to be able to connect it and get it to operate

• This design review will also include a presentation.

• The presentation, final report, and documents are not due the day of the demonstrations but can be completed the next week.

Other Information

• Simulated frequency response of the transmitter 
• Measure frequency response of the transmitter
• Simulated frequency response of the receiver
• Measured frequency response of the receiver
• Measured power consumption of both the transmitter and receiver
• Measured minimum detectable power of the receiver
• Measured power density at 5 feet and 20 feet (W/cm2)
• Measured alignment sensitivity
• Put eye safety class on your device and in the specification document
• Document the eye safety requirements and specifications
• Distance range over which the system will transmit music (This range should be at least 5 feet – 20 feet.)