The Baby Protector: Baby Monitor to protect against dogs

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The Baby Protector Baby Monitor to protect
against dogs

• Ermin E. Arias
• Advisors Professor Hassib
• Professor Hedrick
• March 1, 2008.

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• What is this project about?

• In this project I modified a baby monitor
  to A) Prevent a dog from getting into the
  infants crib.
• B) Notify the parent that their pet is in the
  childs room.

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Motivation

• My sister recently had a baby
• In the United States thirty-nine percent1 of the
  households own a dog.

http//www.hsus.org/pets/issues_affecting_our_pets
/pet_overpopulation_and_ownership_statistics/us_pe
t_ownership_statistics.html
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My Idea

• To modify a commercially available baby monitor
  by combining it with an invisible dog fence. This
  will train the pets to remain within a specified
  distance from the infants crib.

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Performance Criteria

• The dog collar will produce a shock if the dog is
  within 12 ft.
• Wirelessly notify parents unit up to 600 ft away
  when shock is triggered.

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Cons of todays monitors

• Interference
• Static
• Battery power
• It can only MONITOR, it does not provide any
  immediate assistance.

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Disclaimer

• The safety and effectiveness of modern electronic
  training devices are supported by The Humane
  Society of the United States, The American
  Society for the Prevention of Cruelty to Animals
  (ASPCA) and the International Association of
  Canine Professionals, among others.1
• 1 The Facts About Modern Electronic Training
  devices
• http//www.discount-pet-superstore.com/repeated_im
  ages/Truth20about20static20shock.pdf

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Invisible Dog Fences

• Protects pets
• Protects owners furniture and space
• How does it work?
• A transmitter
• A lightweight receiver worn on your pet's collar

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Fence usedIndoor Innotek Zones Instant Pet
Barrier

• Features
• The transmitter runs on batteries
• It works for cats and dogs
• Adjustable Correction Zone - Adjustable boundary,
  set the correction field from a few feet all the
  way up to 12 feet.

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Monitor used

• Evenflo Whisper Connect 900-Mhz Tria 3-Way
  Monitor

Product Description 3-way communication has a
walkie talkie feature Range of up to 650ft
Out-of-range indicator and alarm 7 levels of
sound lights Low battery indicator
Rechargeable batteries included Parent unit
finder
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How my idea works
If pet doesnt leave area
Transmitter placed near babys crib sends RF
signal.

• Receiver in collar picks up the signal that the
  transmitter is sending if pet is too close.

Collar emits a shock. Shock signal causes second
transmitter to notify parent.
Shocks and parents notifications continue.
If pet leaves
End
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Transmitter-Receiver Frequency
Figure 2 Frequency graph of the transmitter, it
shows that the transmitter is transmitting at
6.25 kHz frequency. Note Peaks are ringing
caused by the inductance on the antenna
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Testing the collar results
Figure 1 As we can see by the figure above, the
shock is emitted in fast pulses. Each pulse
consist of an ON time of 15 microseconds, this
continues for 6 seconds.
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The 555 Timer

• Trigger pulse at pin 2 initially sets the 555
  internal flip flop on by comparing the input
  pulse to 1/3 of the supply power to a second
  comparator.
• 555 stays on until this timing cycle turns it
  off by resetting the control flip flop.
• tw 1.10RAC
• (Where tw is the resulting time)

http//www.williamson-labs.com/pu-aa-555-timer_fas
t.htm
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Stretching the Signal
Figure 3 Signal as received from the comparator
into the 555 timer. Each pulse has an ON time
of 15 microseconds

• Figure 4 Signal after going thru timer.
• Note Signal has expanded to last 8 milliseconds

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Detailed Block Diagram
Transmitter next to monitor continuously sends RF
signal
Shock triggers the comparator
Receiver in dog collar receives signal and
generates shock IF necessary
555 Timer
Transistor Inverter
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Detailed Block Diagram Cont
Signal received by receiver, goes thru third
comparator add hysterisis to get rid of
instability
Transmitter sends a signal to the receiver in the
parents unit
Signal goes into microprocessor
Voice signal produced and injected into monitors
microphone
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Complete System Circuit Diagram
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Getting rid of instability
Figure 5a Signal from the receiver before going
through the comparator.
Figure 5b Signal from the receiver after going
through the comparator.
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Basic StampTransmitter and Receiver

• Single-board computer that runs the Parallax
  PBASIC language interpreter in its
  microcontroller.
• Parallax 433.92 MHz RF transmitter
• Parallax 433.92 MHz RF receiver
• Fast data transfers

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Conclusion

• The device prototype has been tested and it meets
  the performance criteria.
• Sends a wireless notification to the parent unit
  up to 650ft away if dog collar triggers shock.

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Future Work

• Make it more user friendly
• Design and manufacture a printed circuit board.

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Acknowledgement

• Gene Davidson

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References

• http//www.consumersearch.com/www/family/baby-moni
  tor-reviews/index.html?referreryahoo_ssp
• http//www.howstuffworks.com/question333.htm
• http//home.howstuffworks.com/pet-fence6.htm
• http//www.amazon.com/Evenflo-Whisper-Connect-Nurs
  ery-
• Monitor/dp/B000CDNECQ
• http//www.rfdigital.com/index.htm - radio info
• http//www.howstuffworks.com/radio-spectrum.htm -
  receiver
• http//www.acornpetco.com/index.php?crn213rn460
  actionshow_detail
• http//www.semiconductorstore.com/Pages/asp/search
  .asp
• http//www.wireless-dog-cat-fence.com/Indoorwirele
  ssdetails.html
• http//www.williamson-labs.com/pu-aa-555-timer_fas
  t.htm

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Questions?