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USF college of engineering EEL 4906.001 - Engineering Design1 Term & Meeting Info: Spring 2015. M 6:30pm – 9:15pm. Angelina Colannino, John Hook, Kjersti Raabe, Brian Wagner
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Programmable, RFID controlled automatic feeder User defined scheduled feeding time Minimal product management required
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1. RFID Tags must be in range Must operate with material between tag and receiver 2. RFID receiver must operate without tag collisions 3. Timer Interface must be defined by user Must store 3 set times Must take input from interface 4. Motor Circuits triggered by logic circuit/timer 5. Power Supply
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Material must be thin enough to avoid interfering with RF signal. Receiver must be mounted on front of module so that tags can be within 4” range. Receiver must be mounted parallel to front of module in order to receive signal Tags operating on frequency of 125 kHz
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Receiver must sense presence of RFID tags without error The presence of more than one tag may cause tag collisions, which result in receiver error. Test plans include tag collision experiment.
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Timer must be set by interface screen/buttons on front of module. Screen must display current time, as well as interface for setting feeding times. Timer must store up to 3 feeding times.
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Motor circuit must respond to trigger from logic circuit. Logic circuit must take input from RFID receiver as well as timer. Trigger must be produced when both timer signal is present and RFID tag signal is received. Typical servos operate from PCM signals
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Primary: 120 VAC-4.5VDC (regulate between 4-6 V) step down transformer power supply Secondary: Battery Back-up (Alkaline) 4.5 V DC 42 hrs when in active use 10-year shelf life http://www.energizer.com/batteries/energizer-max-alkaline-batteries#d http://data.energizer.com/PDFs/e95.pdf
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Voltage Regulator LM7805 would make most sense for designing/regulating the power supply if using a chip to do so
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RFID Reader 4.5-5.5 VDC Arduino Uno Operating Voltage 5V Input Voltage Limits 6-20V Servomotors 4-6V DC Maximum current draw is 140 +/- 50 mA at 6 VDC when operating in no load conditions, 15 mA when in static state file:///C:/Users/John-Hook/Desktop/28140-28340-RFID-Reader-Documentation-v2.3.pdf https://www.parallax.com/sites/default/files/downloads/900-00005-Standard-Servo-Product- Documentation-v2.2.pdf
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Self contained Subsystems interface with each other RFID serial connection with Arduino Timing Logic Circuit
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RFID sensor Range Interference Tag collisions Timing Circuit Interface operation Produce trigger Storage Servo Motors Respond to trigger Weight/strength
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Arduino Code vs. User Interface Corkscrew vs. “Water Wheel” Dispenser Drawer vs. Door Scale vs. Clear Reservoir Wi-Fi vs. Manual Setting Alarm tone vs. Voice
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RFID sensor Range Interference Tag collisions Timing Circuit Interface operation Produce trigger Storage Servo Motors Weight/strength
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Temperature Place system in extreme temperatures and verify operation. Accessibility Test operation of lid on top of module. Test operation of buttons/screen Capacity Test amount of food reservoir can hold
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Range Read data from RFID receiver, holding tags at several different distances. Interference Read data from RFID receiver when different materials are used for module.
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User-defined Settings Use interface to set 3 separate feeding times. Demonstrate that the feeding times produce a trigger. Storage Demonstrate that feeder will store three feeding times at once.
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Trigger Produce trigger from timing and RFID receiver to demonstrate that motor will respond. Drawers Demonstrate that motor can move the drawer. Refilling mechanism Produce trigger and demonstrate that refilling mechanism operates properly.
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Inherent Overheating Motors Battery Failure Implementation Probability of microcontroller failing (prototyping) Timing Circuit RFID Interference
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Probability (Likelihood) 1 0 Consequence Performance Cost Schedule Potential Degradation Sys Reqt not Achieved Element Increase > 50% System Increase > 40% Element Increase Increase >10% x x x x High Risk – Severe disruption expected to performance, cost, and / or schedule even with risk mitigation plans in place. Moderate Risk –Expected disruption to performance, cost, and / or schedule can be overcome by implementing risk mitigation plans. Low Risk – Little disruption expected to performance, cost, and / or schedule.
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Double checking the code Testing the code before finalizing the feeder
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Probability (Likelihood) 1 0 Consequence Performance Cost Schedule Potential Degradation Sys Reqt not Achieved Element Increase > 50% System Increase > 40% Element Increase Increase >10% x x x x High Risk – Severe disruption expected to performance, cost, and / or schedule even with risk mitigation plans in place. Moderate Risk –Expected disruption to performance, cost, and / or schedule can be overcome by implementing risk mitigation plans. Low Risk – Little disruption expected to performance, cost, and / or schedule.
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Testing of Multiple RFID tags Range of the tags Interference
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