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Automatic Pet Feeder

Automatic Pet Feeder. Robert Fleming Vishak Ganesh Vu Tang Viet Nguyen Kevin Clark. What it is. Modified automatic pet feeder Wireless beacon on a pet collar. http://www.terrificpets.com/pet_supplies/dog/bowls-feeders/auto-feeders/14429.asp

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Automatic Pet Feeder

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  1. Automatic Pet Feeder Robert Fleming Vishak Ganesh Vu Tang Viet Nguyen Kevin Clark

  2. What it is • Modified automatic pet feeder • Wireless beacon on a pet collar http://www.terrificpets.com/pet_supplies/dog/bowls-feeders/auto-feeders/14429.asp http://www.dobiedetectives.com/dogtraproducts.html

  3. What it does • Automatically feeds pet upon approach • Activated by collar device • Dispenses food based on time • Limits pet food intake

  4. Why • Automatic feeding • Specialized diet • Prevents feeding of strays • Keeps food fresh

  5. How it works • Beacon device attached to pet collar broadcasts at 10 second intervals • Matched receiver detects beacon at short ranges • Microcontroller dispenses food based on user settings and time interval

  6. Collar Beacon http://www.linxtechnologies.com/Documents/TXE-xxx-KH2_Data_Guide.pdf

  7. Collar Beacon TXE-418-KH2 Powered by coin cell battery We want small duty cycle on transmitter 555 timer circuit controls transmit enable pin on TXE-418-KH2 chip C1: 10 uF, R1: 100K R2: 1M, Diode: 1N4148, 9.1% duty cycle, 11 second period

  8. TXE • TE goes high, TXE chip transmits • Address specified by pins A0-A9 • Range controlled by LADJ

  9. RXD • RXD-418-KH2 chip is matched receiver for TXE chip • VT goes high when a signal from transmitter with matching address lines is detected • D0-D7 replicate their analogs on the TXE chip http://www.linxtechnologies.com/Documents/RXD-xxx-KH2_Data_Guide.pdf

  10. Dog Feeder • Matched receiver chip receives signals from collar beacon • Microcontroller input is connected to valid transmission (VT) pin on RXD chip • Microcontroller turns on drive motor in dog feeder • Motor remains on for a length of time governed by user settings

  11. Microcontroller

  12. Microcontroller Code MinimumFeedAmount=10 MaximumFeedAmount=20 StartOfLoop: IsRXDChipVTPin high? ->Yes, Goto PrepareToFeedDog ->No, Wait 5, GoTo StartOfLoop PrepareToFeedDog: FeedAmountPerDay=(MaximumFeedAmount-MinimumFeedAmount)*DIPSwitchValue+MinimumFeedAmount TimeSinceLastFeeding=Now-TimeLastFed MotorRunTime=TimeSinceLastFeeding/1Day * FeedAmountPerDay Relay Control Pin=high Wait MotorRunTime Relay Control Pin=low Wait 10 minutes GoTo StartOfLoop

  13. Feeder • Motor is powered by normal AC power • Power to motor is controlled by relay • Relay is controlled by microcontroller Relay controlled AC motor with auger to feed food through at a constant rate

  14. Prototype Costs

  15. Production Costs

  16. Current Progress • Working prototype collar beacon • Working receiver circuit configuration • Cypress Microcontroller (CY8C29466) • Working feeder with reservoir and dispenser

  17. Collar Beacon

  18. Receiver

  19. Microcontroller

  20. Feeder

  21. Problems • Antenna directionality • Lack of built in timer in microcontroller

  22. Future Work • Gain increased understanding of Cypress microcontroller • Program microcontroller • Design battery status indicator • Fit battery to transmitter prototype • Power receiver from Cypress EVAL board

  23. More than 140 million dogs and cats in the united states- every one of them eats!

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