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May 7, 2007

Brett Hamilton Hardware, GUI, Sensor. Mateusz Wyganowski Microcontroller, PCB, Hardware. Kodin Taylor GUI, Web Site. Portable Low Cost Optical Spectrometer. GUI and Interface. Electronics. Microcontroller: Atmel Atmega8 RS-232 Driver: Dallas Maxim MAX232A

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May 7, 2007

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  1. Brett Hamilton Hardware, GUI, Sensor Mateusz Wyganowski Microcontroller, PCB, Hardware Kodin Taylor GUI, Web Site Portable Low Cost Optical Spectrometer GUI and Interface Electronics Microcontroller: Atmel Atmega8 RS-232 Driver: Dallas Maxim MAX232A Power Regulator: Linear LT3461A Sensor: TSL1401R The GUI interface runs on the Windows operating system on top of the .NET framework. It is responsible for displaying the data from the sensor in a tabulated and graphical form. Each bar in the spectrograph is colored based on that particular wavelength. The program also enables the user to store data for later retrieval. May 7, 2007 Purpose Recently, easy to use linear-array light detectors have become available at very low cost. By designing circuitry and software for the interfacing to these sensors a portable and low-cost spectrometer was made. Background A spectrometer is used to measure the properties of light over a specific wavelength range. it consists of a slit, a light dispersing element (prism or grating), lenses, and a light detector. The slit creates a beam of light which is dispersed by the prism or grating over the detector. Graphical Interface The software is also responsible for configuring various operational parameters of the microcontroller such as the sensor clocking frequency or serial communication parameters. The parameters names and values are read from the microcontroller dynamically. Lenses are typically used to further focus the light rays. The light detector is interfaced to digital electronics which may be used to filter, analyze, and/or store the information for later retrieval. Overview This project has multiple facets of design and implementation: Controlling the Sensor The sensor is controlled by two digital inputs – a clock and a signal. The sensor outputs an analog value for each of the 128 photodiodes on the chip at a rate of about 8 kHz. Arrangement of optics Microcontroller Configuration Lastly, the software features facilities to automatically calibrate the normalization values in order to compensate for the sensor’s uneven response to varying wavelengths. This requires as input a known set of data for an element, and the current reading of the same element. Costs Electronics: $107.00 Commercial Enclosure $450.00 Total $557.43 PCB with Microcontroller And supporting hardware Lenses, photosensors and prism User Interface

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