AU2016100138A4 - Swimmer Supervision System - Google Patents

Abstract

A system to detect water disturbance caused by an incapable swimmer and alert a supervisor who can then attend to the swimmer having been alerted. The system detects water disturbance using movement sensors including accelerometers attached to pool skimmer boxes or floating objects as well as water level measurement sensors, which are reported to a supervisor's mobile computing device and alarm system. The alarm may be cancelled upon supervisor response. Additionally, the system can monitor the opening of a gate report or alarm on the detection of the gate opening and the combination of the gate open event and other sensor detections can trigger an alarm. o6 SM'TptAYZ 4+00 C14ECK WAT r 2 2o 4-1 L+10

Description

SWIMMER SUPERVISION SYSTEM TECHNICAL FIELD [0001] The subject matter disclosed herein generally relates to protecting incapable swimmers by warning a supervisor that they are in the water or have opened a pool gate. Specifically, the present disclosure addresses systems and methods to perform detection of water disturbance in a pool. SUMMARY [0002] A system to detect water disturbance caused by an incapable swimmer and alert a supervisor who can then attend to the swimmer having been alerted. The system detects water disturbance using movement sensors including accelerometers attached to pool skimmer boxes and other objects, which are reported to a supervisor's mobile computing device and alarm system. The alarm may be cancelled upon supervisor response. Additionally, the system can monitor the opening of a gate report or alarm on the detection of the gate opening. DETAILED DESCRIPTION [0003] Each year many children and adults drown in swimming pools. Especially tragic is the death of children who enter swimming pools without any supervisors being aware. Children or disabled people, or anyone who cannot swim on their own or through medical conditions lose the ability to swim are referred to in this disclosure as an "incapable swimmer", while people who can assist such people are referred to as "supervisors". After falling or entering the pool there is only a short amount of time before the incapable swimmer will drown or suffer physical damage. The described system uses radio devices with sensors attached to objects which are disturbed 1 by water when someone, (in this case the incapable swimmer) enters the water. The sensors including accelerometers sense movement and the processor is either awoken by a hardware interrupt upon the sensing of movement or the processor checks the sensors for movement regularly. The sensors are coupled to a processor which also has a low power Radio frequency transmitter. The sensors coupled to processor are attached to objects that are moved by water disturbance or can measure the movement of water. Examples of objects that are moved by water disturbance and can detected include but are not limited to the "skimmer hinged weir assembly" ( skimmer flap weir) and a floating object ( where the floating object may also be affixed to the side of the pool or encaged but able to float freely under the influence of the water ). [0004] In the case of the "skimmer hinged weir assembly" primarily horizontal ( but with some lesser vertical movement ) may be experienced by the weir and so measured by the sensor. The magnitude and frequency of accelerometer movements may be used determined if the disturbance is slight perhaps caused by the wind or more pronounced and so caused by the "incapable swimmer". [0005] In the case of a floating object to which a processor, with radio and accelerometer is connected, primarily vertical up and down accelerometer as the water moves it up and down. [0006] Floating objects may including a floating ball, play equipment or floatation safety devices. [0007] In the case of sensors measuring the movement of water, these can include a water level sensor such as a resistive or capacitive moisture / water sensor which may be fixed vertically to measure the water height and may measure frequency and amplitude and other patterns of movement of water waves from water disturbance. 2 [0008] The accelerometer may be one, two or three dimensional. [0009] The radio communication link maybe any low power Radio frequency, including BLUETOOTH m Low Energy (Smart). [0010] In all cases, when the sensor movement experienced by the check against a sequence of movements patterns or statistical values along with algorithms to determine if the water disturbance is caused by someone entering the pool. [0011] Upon detection of water disturbance, a message is sent to a the supervisor mobile computing device and if the supervisor is present, a signal is received from a mobile computing device within a set timeframe indicating the presence of the supervisor. If there is no response / or signal from a supervisor user then an alarm may be sounded near the pool area. [0012] In one configuration, the signal is sent simultaneously to the an alarm device which can produce a loud noise to alert people and also to a mobile computing device of one or more supervisors ( for example all parents at the house). If there is no response to the signal sent to the supervisors after a countdown on the alarm device the alarm generates a noise. If however a supervisor responds, a signal is sent to the alarm device, or if a signal has been recently sent from the supervisors mobile computing device to the alarm device then no alarm is sounded. [0013] In addition to measuring of water disturbance to warn a supervisor that an incapable swimmer is in the pool water, the detection of the opening of the pool gate may be used to send a message to a the supervisor mobile computing device or receive a signal from a mobile computing device within a set timeframe indicating the presence of the supervisor. If there is no response / or signal from a supervisor user then an alarm may be sounded near the pool area. 3 [0014] If the supervisor's mobile computing device is moved as measured by the mobile computing device's accelerometer, then this movement can be used to trigger the sending of a signal to the alarm device ( for example attached to pool gate ) and / or the water disturbance monitoring processor to indicate the presence of the supervisor, who because of the movement of the mobile computing device is actively holding the device. [0015] In place of a movement sensor such as an accelerometer, a range of movement sensors may be used including inertial based sensors, gyroscopes, tilt, contact and vibration sensors. [0016] In one instance the radio communications link between the processor measuring the water disturbance and an alarm device or mobile computing device may be a BLUETOOTH TM Low Energy device. The proximity service of the BLUETOOTH TM Low Energy devices may be used to determine the level of separation of the supervisor's mobile computing device and the water disturbance sensing device so that an alert to the mobile computing device is only sent if the distance greater than a safe distance from which supervision can be carried out. [0017] The gate sensing can also be combined with other measurements for water disturbance, if considered only significant if gate was also open ( for example because there is no other way to enter that through the gate). [0018] The system is described as follows. [0019] Referring to figure 1, [0020] The Entity Detection Device 100 consists of a processor 102 with software 103 which can run programs, including but limited to monitoring inputs, aggregation, storage and communication of measures and receiving of 4 status, as well as communicate using lower power RF Bluetooth, and Bluetooth Low Energy (Bluetooth 4) using an antenna 104 and powered by a battery 101 that is often but not limited to being small batteries such as a coin battery and may also be charged using a solar panel. The sensor device has any of the following sensors including a magnetometer 106 sensors and/or passive infrared sensor 107 and/or light sensor 108 and/or contact switch 109 and/or movement sensor (including vibration, accelerometer, tilt switch ) 110, electrical interface to sensor for water level determination including capacitive sensor 111. Components of the entity detection device 100 are wired to the processor 102 by the electrical contact wire 105. Any number and type of sensors can be connected to the sensor device. The entity detection device 100 may also include an analogue to digital converter which may be interfaced to read sensor values. [0021] With reference to the entity detection device 100 at the time of writing this description the Texas Instruments cc2540 is one example processor 102 which also includes a software stack for Bluetooth Low Energy which is a component of the overall software 103. [0022] The Entity Detection Device 100 can also be equipped with an accelerometer, temperature, magnetometer, passive infrared sensor (PIR), contact switch (for example the opening and closing of an electrical circuit) and other sensor devices. These can be used to provide a signal that wakes up the processor to avoid the processor needing to wake up periodic to check these sensor devices. [0023] The entity device is equipped with a processor which can use different amounts of power depending on whether it is in the listening for devices, receiving, transmitting, sustaining a pairing or bonded connection, or sleeping. When the device is in sleep mode it uses limited power and can be "woken" from the sleep state by a timer or movement sensor such as an accelerometer, which can be used to tailor the frequency with which the device wakes up and so uses more energy based on the circumstance, risk level and so reasonable 5 frequency or amount of time to wait between each time the processor wakes ups and listens or transmits. In the case of the Entity Detection Device 100 it is optimal to choose a monitoring mode wherein the Entity Detection Device 100 minimized transmissions and performs listening in by polling at a certain frequency between which the processor sleeps and in this configuration only transmit when an event occurs. When the processor wakes up the sensor value can be checked and transmitted if desired to the mobile computing device. [0024] Typically, for an entity detection device using low power RF such as Bluetooth 4, to transmit takes most power, to be listening or receiving less power and to sleep till woken up by sensors such as accelerometer 110, still less power including the accelerometer 110 or other such input / output devices power needs, while sleeping and awaking on a timer the least. Transmitting with Pairing or bonding typically has a bonding time of at least ten seconds and so uses more energy and is to be avoided if one of the other strategies can be utilized [0025] The Strategy is to reduce the time awake (not in sleep mode), limit receiving, polling for listening time, really reduce transmission time which uses the most power including a higher peak load. Accelerometers 110 described include one dimensional axis, two dimensional axis or three dimensional axis. [0026] [0027] In some embodiments, some or all of the components 106, 107, 108, 109, 110, 111 may be included in the device. [0028] Referring to figure 2, [0029] A mobile computing device 200 consisting of a processor and radio 201, software 202, display 203, keyboard 204, antenna 205 and accelerometer / gyroscope 206. Functions described in this disclosure involve information 6 being sent, received or processed may be implemented by the software 202. The processor and radio and antenna shall be able to communicate in or by, but not limited to, low power RF such as Bluetooth, and Bluetooth Low Energy (Bluetooth 4) as well as be able to communicate using other forms of WiFi, mobile network communication, internet, SMS, and wire and cable as some non limiting examples. The Mobile Computing Device 200 also includes a battery. Example mobile computing devices 200 can include but are not limited to iPhone, Android, Smart Watches, Tablets, laptops and the like. [0030] Functions described in this disclosure involve information being sent, received or processed may be implemented by the software 202. The processor and radio and antenna shall be able to communicate in but not limited to low power RF such as Bluetooth, and Bluetooth Low Energy (Bluetooth 4). The Mobile Computing Device 200 also includes a battery. Example mobile computing devices 200 can include but are not limited to iPhone, Android, smart watches, tablets, laptops and the like. [0031] The mobile computing device 102 can also be iWatch, smart watch, iPhone, iPod, iPod, tablet, Android, Windows or other operating system based device or other such devices. [0032] Referring to Figure 3, [0033] A person incapable of swimming 303, or of limited swimming ability is at risk of drowning in a pool water 300. [0034] Persons who are incapable of swimming 303 (or need careful supervision when swimming including children and disabled people) may enter a swimming pool area 399 and enter pool water 300 and need assistance 7 from a supervisor user 304 who is capable to monitor, assist or rescue the incapable swimmer 303 out of the pool water 300 or out of danger. [0035] The pool area 399 may have gate 301 and fence 302 surrounding the pool water 300. The pool may also relate to a swimming pool. The pool may have a pool skimmer hinged weir assembly 307 (also known as a skimmer flap weir, skimmer flapper, being part of a pool skimmer assembly). The side of the pool 380 bounds the pool water 300. [0036] The supervisor 304 may be inside the pool area 399 able to observe the incapable swimmer, or outside the pool area 399 and incapable of noticing the condition of the incapable swimmer 303 who may be unable to able to assist or monitor the user. A supervisor user 304 is responsible for making sure a person incapable of swimming 303 is safe from drowning. The objective of this invention is to ensure that supervisor user 304 (or other users) are alerted when the incapable swimmer 303 enters the swimming pool water 300 and / or enters through the pool gate 301. [0037] The supervisor 304 has a mobile computing device 312 ( as described by 200) with him. Optionally, this device 312 may include an movement detector such as an accelerometer which is capable to sense if the supervisor 304 is moving the mobile computing device 312 and so is likely to be actual present with the mobile computing device 312 as opposed to simply leaving the mobile phone 312 inside the pool area 399 but actually being outside of the pool area , or perhaps inside but aslepp, and so not supervising the incapable swimmer 303 having left the mobile computing device 312 behind in the pool area 399 ( and so as detected by the accelerometer on device 312 as not moving). [0038] An entity detection device 306 ( as described by 100) including an accelerometer 110 is attached to a pool skimmer hinged weir assembly 307 (also known as a skimmer flap weir, skimmer flapper, being part of a pool 8 skimmer assembly). The entity detection device 306 includes an accelerometer sensor to detect movement. [0039] The pool post 320 has a gate post 301 which it opens and closes in relation to. The pool gate 301 may also optionally have a magnet or light source 321 on it. The pool gate post 320 has an entity detection device 309 ( as described by 100) which can perform several functions. Firstly, it can receive radio communications 308 (including by WiFi , Bluetooth or Bluetooth Low Energy, or low power RF) indicating movement of the skimmer flipper or weir 307 from entity detection device 306. The entity detection device 309 has a loud audio alarm or siren 310 ( and also optionally also light display ). The device 309 may optionally also be powered by a solar cell 311. When the a signal 308 is received by device 309 it can sound the audio alarm 310. The device 309 can also receive signals from other entity detection devices connected to other entities or objects that change state in response to the displacement of pool water 300 or the movement of the incapable swimmer 303. In some cases a combination of signals such as 308 from a combination of entity detections devices detecting movement of the incapable swimmer 303 may be require to trigger the activation of the alarm 310. A timer may be employed in software on the device 309 to wait a period of time to for a message from a mobile computing device 312 to cancel the alarm or a signal to request a response from a supervisor user 304 on their mobile computing device 312 may be received indicating that an alarm will sound after a period of time if a cancel signal 314 is not received. [0040] In another embodiment, the devices 309, 310 and 311 may be placed on the gate 301 opening and closing of the pool gate 301 detected by the use of an accelerometer 110 on the device 309. [0041] Alternatively when the mobile computing device 312 is moved at any time ( or when in the pool area 399 ) then a signal to indicate that the supervisor is present and to cancel any alarms 314 is sent. 9 [0042] Before an alarm 310 is generated a signal 315 may also be sent to a mobile computing device 312 to which the user via their mobile computing device 312 may respond by cancelling the generation of the alarm before an alarm is sounded. [0043] The cancellation signals 314 ( or presence signal telling the alarm not to fire) can be generated periodically by time or movement or a combination when the mobile computing device is within a certain range, or the by giving the transmission signal a certain strength. [0044] The pool gate 301 opens and closes relative to the pool gate post 320 which has the entity detection device 309, 310 and 311 mounted to it. The entity detection device 309 may have a contact switch which is opened and closed by the gate butting against it as one non limiting example. The opening and closing of the gate may also be detected with a the entity detection device 309 coupled to a magnetometer or reed switch as some non limiting examples which detect the magnetic field strength from a magnet 321 increasing and decreasing ( or in the case of the reed switch closing a circuit) or by a light sensors coupled to device 309 measuring a light from a light source 321 or the blocking of light on the light sensor by the gate. The magnet or light source 321 is mounted on the gate. [0045] In this way if the mobile computing device 312 and hence supervisor 304 is close to the swimmer 303 then an alarm from device 309 will be surpressed or cancelled. [0046] Alternatively the alarm cancel signal 314 (which may also be thought of a supervisor present - ignore detections signal) can be sent to the water displacement measurement device such as 306, 331, 332. [0047] The entity detection device 309 is coupled electrically to an alarm or siren 310. The device 310 may also be a separate entity detection device 10 incorporating a alarm or siren and the device 309 activates the alarm 310 in this case by radio communication. [0048] The mobile computing device 312 can know to send a periodic signal 314 as described above ( at set intervals or when the mobile computing device 312 is moved) or be listening for a signal sent from a water displacement detection device such as an entity detection device 306 connected to the pool filter box weir / flapper 306 by using GPS, wifi, radio detection, radio triangulation or other techniques, including also BLUETOOTH TM low energy to determine the location of the mobile computing device and hence whether to transmit or listen. [0049] Secondly, the entity detection device 309 checks when the pool gate 301 is opened and generates an alert such as an audible noise/alert by alarm 310 via 309 whenever the pool gate 301 is opened at any time, or when the pool gate 301 is opened a signal 315 is sent to a user 304 via their mobile computing device 312 and if the user does not respond 314 to an alert 315 from the mobile computing device 312, or when the user's mobile computing device 312 can be detected by it generating a radio signal indicating it's presence 314 which can be received by the mobile computing device 312 either generate at time intervals, or when the mobile computing device 312 detects from radio signal detection including from GPS the presence of the device 312 within the pool area 399, or when the mobile computing device 312 detects acceleration from an accelerometer coupled to the device. [0050] Thirdly, the entity detection device 309 checks when the pool gate 301 is opened and sends an alert 315 to the supervisor user's 304 mobile computing device 312. [0051] When the incapable swimmer 303 enters the water 300, the skimmer flapper 307 is moved by the water displaced or disturbed 305 by the incapable swimmer's 303 entry into the pool water 300. The movement of the skimmer flapper 307 is detected by, as one non limiting example, an accelerometer which is attached to entity detection device 100. When one or more 11 acceleration values are sensed they are compared to a set of one or more sets of acceleration values, including comparison techniques including correlation and fuzzy set matching, or other matching, comparison or statistical methods as some non limiting examples. [0052] When a comparison or detection of movement is made by device 306 that indicates the flapper 307 has been moved by displaced water 305 then the system can perform in different modes. [0053] Firstly, in the preferred mode of operation, upon detection of flapper / weir 307 movement corresponding to movement of displaced water 305 , an alert signal 308 is sent to entity detection device 310 and also to mobile computing device 312. A timer in the software on the entity detection device 309 begins to countdown to a time at which the software 103 will activate the alarm 310. If an alert cancellation signal 314 is received by device 309 the software can cancel the alarm before activation. The cancellation signal 314 would in one instance be generated by the supervisor 304 in response to receiving the alert signal 308 sent and viewed on the mobile computing device 312. It would indicate that the supervisor is aware of the swimmer 303 in the pool. Optionally a time delay may be built into the system at various points to prevent detection or warning for a time period following the initial detection, warning or acknowledgement of alert. [0054] Secondly, in one mode of operation, at a point before receiving the detection of flapper / weir 307 movement corresponding to movement of displaced water 305 , as an alert signal 308 sent to entity detection device 310 a cancellation signal 314 is sent from the mobile computing device 312 either at a regular interval or when the device 312 measures acceleration indicating that the user is actively handling the mobile computing device and so still in an area close to the pool water 300 so that if the supervisor user 304 is present, the software receiving the signal 314 will not activate an alarm. [0055] Thirdly, at the point of detection of water displacement 305, either the entity detection device detecting the displacement (such as 306) or after 12 subsequent communication of an alert 308, the entity detection device 309 which generates the alarm 310 attempts to contact the mobile computing device 312 and give the user the opportunity to cancel the alarm by sending a signal to either of devices 306 or 309. [0056] Fourthly, at the point of detection of water displacement 305, the entity detection device 306 sends an alert to device 309 which generates the alarm 310. [0057] In addition to the entity detection device 306 attached to a flapper / skimmer 307 in order to detect water disturbance 305, an entity detection device 331 coupled to an accelerometer sensor attached to, or inside a floating object 330 that can move up and down on the water and so detect water disturbance 305. The floating object may secured to the side of the pool in some fashion. [0058] In addition to the entity detection device 306 attached to a flapper / skimmer 307 in order to detect water disturbance 305, an entity detection device 332 coupled to a water level sensor 333 can measure the water level move up and down and so detect water disturbance 305. The water level sensor 333 may consist of a capacitance, electrical resistance, or hall effect detection of water level at instantaneous points in time to detect up and down variations in water level indicating water disturbance 305 in response to the water movement caused by an incapable swimmer 303 wherein a supervisor 304 should be made alert by mobile computing device 312 or alarm 310 that the water has been disturbed by the incapable swimmer 303 and so they should be alert to watch the incapable swimmer to make sure they are safe. [0059] In any of the instances described, the entity detection devices 306, 331, 332, 309 the devices may be powered by solar power cell. 13 [0060] In any of the instances described, the entity detection devices 331, 332 the devices may send and receive communications in a similar fashion to 306 including signals 313, 308, 360 and whether mobile computing device 312 is inside or out of the area 399. [0061] In some embodiments, upon detection, if the user is unable to cancel the alarm or respond to the alarm, or in other ways indicate their presence by sending signals indicating presence or by listening for requests to known if a mobile computing device is present then the alarm 310 will be generated by entity detection device 309 [0062] In any other the previous recitations, the alarm 310 is only generated if the gate 301 has been detected to have been opened by entity detection device 310. [0063] In any of the previous recitations, the closeness between the mobile computing device 312 and the entity detection device 310 can also be determined by proximity services so that the alarm is only cancelled if the devices 312 and 310 are close. [0064] All described radio communication including by WiFi , Bluetooth or Bluetooth Low Energy, or low power RF) between to mobile computing device 312 and the entity detection devices including devices including 309, 312, 306, 331, 332. [0065] As weather such as wind or rain can cause water disturbance 305 the entity detection devices 306, 331, 332 can also filter out these anomolies with recorded sensor values that correspond to these false positive disturbance patterns. [0066] The accelerometer may operate in one, two or three dimensions. 14 [0067] The entity detection device 100 may be in a low power usage sleep state until the sensor including an accelerometer detecting movement generates a hardware interrupt. [0068] Referring to Figure 4 and 3, [0069] As described in figure 3, in one configuration an entity detection device 306 connected to pool box skimmer weir 307 sends a message upon the detection of water displacement 305 to an entity detection device 309 connected to a gate and a mobile computing device 312. [0070] The entity detection devices 306 and 309 and the mobile computing device 312 each have a software component. [0071] In figure 4, [0072] The software in the entity detection device 306 connected to the skimmer flapper 307 is described in section 400. [0073] The software in the entity detection device 309 connected to the alarm 310 is described in the section 410 [0074] The software in the mobile computing 312 is described in section 420. [0075] With reference to the software 400 running in the device 306, the software starts 401 then moving to check for water disturbance 402 a decision is made 403 which if found causes an alert 405 to be sent 404 to the entity detection device 309 triggering software in device 309 to begin software setting a time count 411 and also causes an alert 406 to be sent to a mobile computing device 312 to begin software displaying an alert for acknowledgement 421. 15 [0076] The software in the mobile computing device 312 receives a signal 406 and displays an alert to the user to confirm it has acknowledged the alert 421 and when acknowledged 422 sends 423 an acknowledgement signal 424. [0077] The software in device 309 begins by setting a time count 411, then decrementing the count 412, waiting for a period of time 413, listens for radio signal 414 from mobile computing device 312 cancelling the alarm, and a decision 415 if a cancel message 424 is received stops the count 416 but if a cancel message 424 is not received the software 410 then checks 417 the count is zero an alarm is generated 418 otherwise returns to step 412 until the count is decremented to zero 417 at which point the alarm is generated 418. [0078] In some embodiments, the gate 301 may also be an entrance to a kindergarten, school, nursing home, or any area that needs to have entry controlled. The access to the gate can be controlled in two modes. Firstly, when the gate is open, or opened, the a alert message 315 can be sent one or more supervisors 304, and as previously described if the message is not replied to cancel 314 an alarm 310 may be generated. [0079] Secondly, at the time of the gate opening, or prior to opening, the entity detection device 309 receives signals from a user's mobile computing device 312 sent as signal 315 or responds 314 to a request to authenticate their presence 315. If the device 312 cannot be identified including also by the checking an identification known by both the devices 309 and 312 and alarm or alert to another mobile computing device 312 may also generate to alert them that an un authorised user has opened the gate. The identification signal 314 or listening to a request for authentication 315 can be enable when a GPS or other radio signal tell the mobile computing device 312 that it is in the area to begin transmitting or receiving. 16 [0080] In any of the above descriptions, movement indicators not limited to but including accelerometer, tilt switches, vibration and inertial positioning systems can be used measure the movement of objects in response to water disturbances. [0081] In some embodiments, the swimmer 303 may have a movement detection device ( of type 100 ) including an accelerometer 110 as one non limiting examples of a movement sensor which either reports all movements 393, or reports when movements stops 393. In the case of reporting when movement stops, the device 309 will regard this stopping in the same way as a water disturbance event 308. In the case of all movements being reported, the device 393 will send a signal 392 whenever movement occurs so that if the device 309 must monitor for when the signal 392 disappears and regard this stopping in the same way as a water disturbance event 308. In another mode the device 393 issues a regular signal 392 so that when the signal disappear, this stopping is regarded in the same way as a water disturbance event 308. [0082] In some embodiments, the pool area may be monitored by a movement detection device ( of type 100 ) including an passive infrared detector 107 which detects infrared emissions / movement 371 from the incapable swimmer moving, and as for 306 generates and receives the same signals and interactions 313, 360, 308. [0083] In some embodiments the pool area may be monitored by passive infrared detectors which detect movement in the pool area 371 from the incapable swimmer moving or also from gate open events. The opening and closing of the gate may also be detected with the entity detection device 309. Movement detections 308 caused by water disturbance from the incapable swimmer may only trigger an alarm if they occur combined with the detection of the gate as open or recently opened so as to limit false positive detections. 17 [0084] In some embodiments the radio communications links 409, 410, 411,412, 413 may be a BLUETOOTH m Low Energy, BLUETOOTH Tm, low power RF, WiFi, 3G / 4G or other such radio communications protocols. 18

Claims (7)

1. A swimmer supervision system consisting of: a water disturbance sensor device incorporating a processor and at least one sensor selected from group consisting of a movement sensor and water level sensor disposed to measure water movement in a swimming pool; a mobile computing device; a low power radio frequency communication link between said water disturbance sensor device and said mobile computing device; wherein said processor communicates water disturbance events to said mobile computing device using said low power radio frequency communication link.

2. The system of claim 1, further consisting of an audio alarm device incorporating an audio alarm and processor, and wherein said water disturbance events are communicated to said mobile computing device and said audio alarm device using said low power radio frequency communication link, and wherein upon the elapsing of a time interval the said audio alarm device will generate an audio alarm if no signal to cancel the said audio alarm is received from said mobile computing device via said low power radio frequency communication link.

3. The system of claim 1, further consisting of an audio alarm device incorporating an audio alarm and processor, and wherein said water disturbance events are communicated to said mobile computing device and said audio alarm device using said low power radio frequency communication link, and wherein said mobile computing device generates an audio alarm cancellation signal if movement of said mobile computing device is detected or the proximity of said mobile computing device to said water disturbance sensor device is close, and 1 wherein upon the elapsing of a time interval the said audio alarm device will generate an audio alarm if no said audio alarm cancellation signal is received from said mobile computing device via said low power radio frequency communication link.

4. The system of claim 1, wherein said at least one sensor is selected from the group consisting of accelerometer, gyroscope, inertial, vibration, compass and tilt switch attached to an entity influenced by water disturbance selected from the group consisting of pool skimmer hinged weir assembly, pool hose and floating object.

5. The system of claim 1, wherein said at least one sensor is selected from the group consisting of capacitance water level sensor, electrical resistance water level sensor or hall effect water level sensor attached to the side of the pool in such a way that said at least one sensor can measure instantaneous changes in water level to detect said water disturbance events.

6. The system of claim 1, further consisting of a gate sensor device disposed to measure the opening of the pool gate, and wherein upon opening of a pool gate an open gate signal is communicated to said water disturbance sensor device or said mobile computing device, and wherein a water disturbance event is only displayed if both said open gate signal and said water disturbance event have been generated.

7. The system of claim 1, further consisting of a gate sensor device disposed to measure the opening of the pool gate, and wherein upon opening of a pool gate an open gate signal is communicated to said mobile computing device. 2