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Tear Analysis Device
A tear analysis device used by the eye care industry in order to diagnose eye diseases. It uses LED emitters and photodetectors to analyze reactions between tears and various assays. The unit contains a full PC keyboard, a 2x40 character LCD, and a custom optical interface. Needle Management SystemThis product provides the necessary power to cut needles as they are inserted into the device and counts the number of cuts completed. At 180 counts the unit flashes a light indicating 180+ cuts. At 200 counts the unit illuminates a red light and turns off the flashing light. The unit is now disabled for further cuts until a new cartridge is inserted into the device. A yellow light illuminates when the battery voltages falls below a set voltage level and the red light illuminates when the battery voltage falls below a second, lower voltage level. At this time, the unit is disabled from any cuts until the battery is fully charged. A green light illuminates when the device is functional for cuts. Digital Motor ControllerThis project includes both hardware and software development of a Digital Motor Controller (DMC) for retrofit to the customer’s manually controlled, motorized test stands. Speed control of the test stand motor is critical because this type of stand is used in potentially sensitive product strength/breakage testing. Actual speed control will be affected through Pulse-Width-Modulation (PWM) techniques, with control decisions based on both shaft encoder inputs, as well as analog readings of motor currents. The Digital Motor Controller is based upon a low-cost, RISC-based microcontroller operating at 20 Mhz. Program instructions are written in a mixture of “C” and assembly language. Efficient coding techniques result in relatively small program code space requirements, which allows the entire program to reside within the microcontroller’s internal ROM space. This eliminates the need for relatively expensive common and inexpensive supporting components such as Analog-to-Digital Converters and Real-Time-Clock/Counters. PC-based software will allow real-time interaction with the Digital Motor Controller, either for control algorithm “tuning,” or Look-Up Table coefficient updates. The Digital Motor Controller supports interaction with an attached PC through standard RS-232 communications. Diagnostic Spirometer Project This project included the electronic design (including hardware and software) of a stand-alone spirometer using the new IEP-developed flow sensor. Included was the development of interface software for a PC running the windows environment. A constant current source, an additional A/D channel, and two (2) D/A channels were included, as well as, an off the shelf display.
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