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Published byJuliana Garrett Modified over 9 years ago
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DISSOLVED OXYGEN MONITOR TEAM MEMBERS: ANDREW BEOUGHER ANTHONY SWOPE HAO WANG I-CHUN CHAO BING BAI COLIN HICKS Senior Design Dec1211 Dec1211
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DISSOLVED OXYGEN MONITOR Measures the concentration of dissolved oxygen (DO). Applications Waste water treatment Marine ecologies Fermentation Dec1211
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DESIGN OBJECTIVES Re-engineer current design by removing or changing existing components. Lowering power consumption Adjusting system timing of the sensor Dec1211
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DESIGN REQUIREMENTS Functional Microcontroller shall determine the dissolved oxygen level over 1 second Local and remote control operation Long battery life during discontinuous operation 5 samples every 5 minutes Operating duration of at least 30 days Dec1211
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DESIGN REQUIREMENTS Non-functional Water resistant monitor unit enclosure Water proof sensor probe Local multi-character LCD Handheld / Portable Dec1211
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SYSTEM CURRENT DESIGN Dec1211
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SYSTEM PROPOSED DESIGN #1 Dual Supply System Dec1211
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SYSTEM PROPOSED DESIGN #2 Single Supply System Dec1211
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HARDWARE PROPOSED COMPONENTS Microcontroller ATXMega128 LED Current Driver MAXIM - MAX3699 TI - TPS61042 Linear Devices - LT1932 DC-DC Converters ADP - ADP150/151 TI - TPS61006 MAXIM - MAX1763 Dec1211
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HARDWARE LED CURRENT DRIVERS Why drive with current and not voltage? Dec1211
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HARDWARE BATTERY CONFIGURATIONS 3 potential configurations Dec1211
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SOFTWARE CURRENT SENSOR TIMING Dec1211
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SOFTWARE PROPOSED SENSOR TIMING Dec1211
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TESTING COMPONENTS Power System: Power efficiency Current output LED driver: Startup times PWM output Actual vs. computed current output Microcontroller: Power consumption of different modes Dec1211
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TESTING SYSTEM Full System Test: Long term battery duration Dec1211
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TESTING SYSTEM Dec1211
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PROJECT CURRENT STATUS Evaluate system operation Update customer requirements Perform component testing Create preliminary circuit board revisions Dec1211
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PROJECT FUTURE PLANS Finalize new circuit board revisions Assemble new circuit board Perform long term battery duration tests Perform application and calibration testing Test programming modifications Re-integrate wireless communications Dec1211
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Questions? Dec1211
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