Multi Layered Pool Intrusion Detection System TEAM G  Orlando Carol  Jay Cueco  Rene Mendoza.

Overview Problem Statement Project Objectives Need Analysis Concept Development End Product Description Block Diagram Intellectual Property Standards Functions and Specifications Project Milestones Work Breakdown Structure (WBS) Budget

Problem Statement The goal of this project is to design and develop a multi-layered swimming pool alarm system capable of detecting unauthorized intrusion in, and around the perimeter of a swimming pool. This product must be robust, marketable, and easily retrofitted. The device must be able to discriminate between a perimeter intrusion and a water surface intrusion.

Project Objectives 1) Detect Intrusions  Detect pool perimeter intrusion  Detect pool water surface intrusion 2) Provide Warning of intrusion  Visible warning of intrusion  Audible warning of intrusion 3) Marketable  Economic  Easily retrofitted into pool area  Weatherproof  User friendly 4) Safe  Unobtrusive to pool area  Electrically insulated from water 5) Reliable  Differentiate between human intrusion versus other objects  Provide warning of intrusion quickly

Needs Analysis The team decided to use the Fishbone diagram technique for needs analysis. This technique helps to determine the root cause of a specific effect. In our case, the effect is the drowning of a child at a swimming pool. The team brainstormed on the possible places, procedures, people, or policies which have an effect on our problem. Three causes were chosen:  Lack of Supervision  Ability of Child to Swim  Implementation of Preventative Measures Survey was conducted to determine the most likely cause. Lack of supervision was determined to be the most likely cause.

Fishbone Diagram

Concept Development Child intrusion prevention of pool side area ElectronicNon-electronic Perimeter based sensors Water surface based sensors Fencing around pool Safety net on pool surface InfraredSonarMicrowave Wave disturbance sensor Wearable electronic Underwater acoustic sensor Battery PoweredDigital Signal ProcessingHydrophoneWaterproof casingWaterproof Casing

Concept Development: Decision Matrix Design ConstraintsPassive InfraredUltrasonicMicrowave C: Must not be susceptible to false alarms due to weather conditions NYY C: Must be able to detect objects at a range of 30m YYY C: Must not interfere with common pool side devices YYN C: Must be cost effective.YYN C: Must be able to be mounted without obstruction to poolside area YYY C: Power must be from battery source YYY C: Must be able to work at degrees NYY Design ObjectivesWeight (%) ScoreWeighted Score ScoreWeighted Score ScoreWeighted Score O: Power conservative O: Simple design O: Fast response time O: Wide temperature range O: Easy to mount O: Low interference emissions Total

End User Product Description  Two outdoor modules representing the perimeter based sensor and the subsurface based sensor.  One indoor receiver capable of receiving incoming signals from the two outdoor sensors.  One indoor alarm module capable of a visual flashing alarm and an audible alarm.

Perimeter Sensor Block Diagram Battery Source Provides remote power for system Ultrasonic Transmitter Transmits constant waveform providing reference for normal environmental conditions Protected Environment Environment provides for dynamic ultrasonic information Ultrasonic Receiver Receives dynamic ultrasonic information Microcontroller Logic circuit needed to check if the ultrasonic sensor detects an intrusion Wireless Transmitter Transmits the signal to turn on the perimeter sensor alarm In House Receiver Receiver needed inside the house to turn on the perimeter alarm Perimeter Alarm Unit contained in the house that will provide the owner with information about the perimeter pool side conditions Perimeter Sensor Block Diagram

Subsurface Sensor Block Diagram Battery Source Provides remote power for system Passive Sonar Device Listens for the underwater acoustic conditions below the surface level Signal Processor Logic unit that will check if the underwater acoustic being received is a possible child Microcontroller Receives the information from the signal processing and sends out the information needed to turn on and off the wireless transmitter Wireless Transmitter Transmits the signal to turn on the surface sensor alarm In House Receiver Receiver needed inside the house to turn on the perimeter alarm Perimeter Alarm Unit contained in the house that will provide the owner with information about the perimeter pool side conditions Surface Sensor Block Diagram

Intellectual Property US Patent and Trademark Office database, patent # 6,642,847 was found to be a patent granted to Sison Co., for a pool alarm device. The patent gives specific information as to the design of the device such as – the means of fastening the device to the pool, the way the detection device and transmitter are coupled, the sensors used for detection (infrared), etc. In finding a suitable approach for design, it is important for the group not to infringe on patented designs.

Standards Consideration 1. Alarm must sound at pool within 20 seconds. 2. Remote alarm must sound at remote location within 20 seconds via a receiver. 3. Alarm must have minimum sound pressure of 85 decibels at 10 feet. 4. Alarm must have an on/off indicator. 5. Alarm must have low-battery indicator. 6. Alarm must automatically reset. In 2002, and at the request of the U.S. Consumer Product Safety Commission, the American Society for Testing and Materials (ASTM) created a standard for swimming pool alarms known as ASTM F :

Functions and Specifications 1 ) Detection of perimeter based intrusion – 30 feet around pool perimeter 2 ) Detection of subsurface object – 15 pounds or heavier (average weight of 2 yr old child) 3 ) Notification of owner – 20 second response minimal delay to allow for immediate action 4 ) Waterproof/Windproof casing – winds of 20 mph (must be able to sustain outdoor elements without false alarm) Notice some specifications are in accordance with ASTM F

Project Milestones 1. Research of possible technologies and selection. 2. Design Initial Prototype.  Perimeter, Subsurface, In-House Receiver 3. Test Initial Prototype  Each section separately followed by full system test.  4. Modification of Prototype.  5. Test Final Prototype  6. Presentation of Device The following accomplishments are the future milestones for the project:

Work Breakdown Structure Build a Multiple Sensor Pool Alarm System Perimeter Sensor Subsystem Subsurface Sensor Subsystem Wireless Transmission and Reception Alarms Ultrasonic Sensor Waterproof Housing Logic Circuit Hydrophone Signal Processing Waterproof Housing Transmitter Receiver Battery Source Visual Perimeter Alarm Audible Surface Alarm Non Terminal Object LEGEND Terminal Object

Budget ComponentsMax $ Labor$17/hr * 15hr/week * 4week/month * 4 months * 3 people Instructor Salary$125 * 1hr/week * 4month/week * 4 months2000 Lab Space$600/month * 1month/4weeks * 1week/168hr * 15hr/week * 4week/month * 4 months 215 Lab Equipment$250/week * 15hr/168hr * 4week/month * 4 month357 Total$15,062