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group3:group3final 2008/12/08 21:13 group3:group3final 2008/12/09 01:15 current
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===== 5.Completed Product ===== ===== 5.Completed Product =====
-The completed product can be seen below, or, in more detail, in the photos above.  The parts list for components used is contained in the budget list. The important and critical devices involved include the laser, the p channel MOSFET, the computers with serial cables, the Mounting and aligning equiptment, the Tube and filter for noise reduction, the lens for focusing the light, the AC filter for signal isolation, the Comparator for Analog to Digital conversion, and the Inverter for inverting the signal. The total cost for construction is a theoretical $63.90. +The completed product can be seen below, or, in more detail, in the photos above.  The parts list for components used is contained in the budget list. The important and critical devices involved include the laser, batteries to supply power, the p channel MOSFET, the computers with serial cables, the Mounting and aligning equipment, the Tube and filter for noise reduction, the lens for focusing the light, the AC filter for signal isolation, the Comparator for Analog to Digital conversion, and the Inverter for inverting the signal. The total cost for construction is a theoretical $63.90. 
{{:group3:dsc00042.jpg?800x600|}} {{:group3:dsc00042.jpg?800x600|}}
 +
 +Close-ups of some of the components are shown below.
==== Transmit Circuit ==== ==== Transmit Circuit ====
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===== 6.Demonstration and Evaluation ===== ===== 6.Demonstration and Evaluation =====
The Demonstration and Evaluation of the project was done over two testing days. The first was an indoors test, and the second was an outdoors test. On both days, the test was a complete success. For the indoor test, the alignment was fast and the project worked right away and only malfunctioned when people walked across the beam during transmission of a file. When this occurred, the photo sent would contain Grey rows where information was lost. For the outdoors test, the alignment was more difficult due to low temperature conditions. The beam spot was also difficult to see due to the failure of 2 lasers the day before the test and the use of a high divergence laser on the day of testing. Nevertheless, the alignment was completed and the project worked again despite the higher amount of background light. This proved that the tube and the red filter were sufficient for blocking light. The Demonstration and Evaluation of the project was done over two testing days. The first was an indoors test, and the second was an outdoors test. On both days, the test was a complete success. For the indoor test, the alignment was fast and the project worked right away and only malfunctioned when people walked across the beam during transmission of a file. When this occurred, the photo sent would contain Grey rows where information was lost. For the outdoors test, the alignment was more difficult due to low temperature conditions. The beam spot was also difficult to see due to the failure of 2 lasers the day before the test and the use of a high divergence laser on the day of testing. Nevertheless, the alignment was completed and the project worked again despite the higher amount of background light. This proved that the tube and the red filter were sufficient for blocking light.
- 
===== 7.Budget ===== ===== 7.Budget =====
Parts purchased for the project: Parts purchased for the project:
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{{:group3:group_3_budget_2.jpg|}} {{:group3:group_3_budget_2.jpg|}}
-Total Cost: $134.64+Additionally, there was a shipping cost of $2.67 for the Digikey order, and a shipping cost of $4.00 for the Newark order. Therefore, the total cost of the project would then be: 
 + 
 +**Total Cost: $141.31** 
 + 
 +The cost to construct the system is a different matter, where only the parts used are included. Essentially the figure is an estimation of the cost to reconstruct the system on a mass scale. Also, shipping costs from Digikey and Newark would not be included, since many sets of parts could be purchased at the same shipping cost.
-Cost to Construct: $63.90+**Cost to Construct: $63.90**

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