An alarm anti-loss device

Abstract

This utility model relates to the field of near-field information communication and personal safety protection technology, and discloses an alarm anti-loss device, including an alarm shell, electronic components fixedly installed on the right side of the alarm shell, and a buzzer fixedly installed on the back of the alarm shell. The electronic components include a main control module, an alarm module, a low-power Bluetooth positioning module, and a signal transmission module, and each module is electrically connected through a PCB circuit board. This alarm anti-loss device integrates the alarm module and the low-power Bluetooth positioning module, retaining the near-range sound and light object finding and deterrent functions of the alarm, while also having long-range location tracking capabilities. It can cope with various scenarios such as forgotten items and suspected theft, achieving multiple uses in one device. It adopts low-power Bluetooth positioning technology, and the module only broadcasts signals periodically, greatly reducing power consumption. It can achieve long battery life with a small-capacity battery. At the same time, the shell size is strictly controlled to maintain miniaturization, which can easily adapt to the carrying needs of personal items such as keys and backpacks.

Description

Technical Field

[0001] This utility model belongs to the field of near-field information communication and personal safety protection technology, specifically, it relates to an alarm anti-loss device. Background Technology

[0002] In the field of near-field communication and personal safety protection, the demand for anti-loss and security protection of personal belongings (such as keys and backpacks) and valuables (such as electronic products and jewelry) is becoming increasingly prominent. However, existing related devices have obvious shortcomings in terms of functionality, power consumption, and portability, making it difficult to meet the comprehensive needs of users. Specific problems are as follows:

[0003] On the one hand, existing alarm devices have limited functionality, only providing short-range alerts and lacking location tracking capabilities. These devices typically rely on lights and sounds to issue alarms. When items are out of the user's sight, such as being left in an unfamiliar place or taken away by someone else, the user can only determine the general direction of the item through the alarm sound. Once the sound weakens or disappears, it becomes impossible to further pinpoint the item's location, significantly increasing the difficulty of finding the item and making it unsuitable for long-distance loss prevention scenarios.

[0004] On the other hand, most existing anti-loss devices use GPS positioning technology, which suffers from high power consumption, large size, and short battery life. To ensure positioning accuracy and real-time performance, the GPS module needs to continuously communicate with satellites, requiring extremely high battery capacity. This results in devices needing large-capacity batteries, making them bulky and heavy, and difficult to fit small personal items such as keys and earphones. At the same time, the high power consumption means that the devices generally have short battery life, requiring frequent charging. This not only increases the burden on users but may also cause the positioning function to fail due to depleted battery, affecting the anti-loss effect. Summary of the Invention

[0005] The purpose of this invention is to provide an alarm anti-loss device to solve the problems mentioned in the background art.

[0006] An alarm anti-loss device includes an alarm housing, an electronic component fixedly mounted on the right side of the alarm housing, and a buzzer fixedly mounted on the back of the alarm housing;

[0007] The electronic components include a main control module, an alarm module, a low-power Bluetooth positioning module, and a signal transmission module, and each module is electrically connected through a PCB circuit board.

[0008] The main control module uses an STM32L4 series low-power microcontroller and is communicatively connected to the alarm module, the low-power Bluetooth positioning module, the signal transmission module, and the power supply unit. The alarm module includes surface-mount LED beads. The low-power Bluetooth positioning module uses a Nordic nRF52832 chip and is electrically connected to the main control module. The signal transmission module is electrically connected to the low-power Bluetooth positioning module and the main control module. The power supply unit uses a 140mAh lithium polymer battery and is electrically connected to the main control module.

[0009] In a preferred embodiment of this utility model, the alarm housing is made of ABS plastic, and an alarm trigger button is provided on the surface of the housing. The button is electrically connected to the main control module. Pressing the button can send an alarm trigger signal to the main control module, and the main control module controls the alarm module to start after receiving the signal.

[0010] In a preferred embodiment of this utility model, a USB-C female charging interface is provided at the bottom of the alarm housing. The charging interface is electrically connected to the lithium polymer battery of the power supply unit through a wire to replenish the battery.

[0011] In a preferred embodiment of this utility model, the surface-mount LED beads are disposed on the front of the alarm housing, and the housing has a light-transmitting hole corresponding to the position of the LED beads; the sound pressure level of the buzzer is ≥100dB, and when the alarm module is activated, the LED beads emit red flashing light, and the buzzer emits an alarm sound simultaneously.

[0012] In a preferred embodiment of this utility model, the low-power Bluetooth positioning module supports the Bluetooth 5.3 protocol, operates in a frequency range of 2400MHz-2483.5MHz, and can periodically broadcast Bluetooth signals at preset intervals of 1-10 seconds; the signal transmission module can receive Bluetooth broadcast signals collected by nearby smart devices.

[0013] In a preferred embodiment of the present invention, a steering seat is fixedly installed on the left side of the alarm housing, a rotating shaft is rotatably connected inside the steering seat, and a clamp is fixedly installed on the outside of the rotating shaft. The clamp can rotate around the rotating shaft and is used to clamp and fix the alarm anti-loss device to clothing, backpack straps or keychains.

[0014] In a preferred embodiment of this utility model, the overall dimensions of the alarm housing are ≤60mm in length, ≤30mm in width, and ≤15mm in height. An installation chamber for the electronic components and battery is reserved inside, and each component is fixed in the chamber by screws or clips.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] 1. This alarm anti-loss device integrates an alarm module with a low-power Bluetooth positioning module, retaining the short-range sound and light locator and deterrent function of the alarm while also having long-range location tracking capabilities. It can handle various scenarios such as forgotten items and suspected theft, achieving multiple uses in one device.

[0017] 2. This alarm anti-loss device uses low-power Bluetooth positioning technology. The module only broadcasts signals periodically, which greatly reduces power consumption. It can achieve long battery life with a small-capacity battery. At the same time, the size of the shell is strictly controlled to keep it small, which can easily adapt to the carrying needs of personal items such as keys and backpacks.

[0018] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings. Attached Figure Description

[0019] In the attached diagram:

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the rear structure of the present invention;

[0022] Figure 3 This is a schematic diagram of the steering structure of this utility model.

[0023] In the diagram: 1. Alarm housing; 2. Electronic components; 3. Steering seat; 4. Shaft; 5. Clamping plate; 6. Buzzer. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this utility model.

[0025] like Figures 1 to 3 As shown, an alarm anti-loss device includes an alarm housing 1, an electronic component 2 fixedly installed on the right side of the alarm housing 1, and a buzzer 6 fixedly installed on the back of the alarm housing 1.

[0026] Electronic component 2 includes a main control module, an alarm module, a low-power Bluetooth positioning module, and a signal transmission module. Each module is electrically connected via a PCB circuit board.

[0027] The main control module uses an STM32L4 series low-power microcontroller, which is connected to the alarm module, the low-power Bluetooth positioning module, the signal transmission module, and the power supply unit. The alarm module includes surface-mount LED beads. The low-power Bluetooth positioning module uses a Nordic nRF52832 chip and is electrically connected to the main control module. The signal transmission module is electrically connected to the low-power Bluetooth positioning module and the main control module. The power supply unit uses a 140mAh lithium polymer battery and is electrically connected to the main control module.

[0028] The alarm housing 1 is made of ABS plastic. An alarm trigger button is located on the surface of the housing. This button is electrically connected to the main control module. Pressing the button sends an alarm trigger signal to the main control module, which then activates the alarm module upon receiving the signal. A USB-C female charging port is located at the bottom of the alarm housing 1. This charging port is electrically connected to the lithium polymer battery of the power supply unit via a wire, used to replenish the battery's power.

[0029] The surface-mount LED beads are set on the front of the alarm housing 1, and the housing has a light-transmitting hole corresponding to the position of the LED beads; the sound pressure level of the buzzer 6 is ≥100dB. When the alarm module is activated, the LED beads emit red flashing light, and the buzzer 6 emits an alarm sound simultaneously.

[0030] The low-power Bluetooth positioning module supports the Bluetooth 5.3 protocol and operates in the frequency range of 2400MHz-2483.5MHz. It can periodically broadcast Bluetooth signals at preset intervals of 1-10 seconds. The signal transmission module can receive Bluetooth broadcast signals collected by nearby smart devices.

[0031] A steering seat 3 is fixedly installed on the left side of the alarm housing 1. A rotating shaft 4 is rotatably connected inside the steering seat 3. A clamping plate 5 is fixedly installed on the outside of the rotating shaft 4. The clamping plate 5 can rotate around the rotating shaft 4 and is used to clamp and fix the alarm anti-loss device to clothing, backpack straps, or keychains. The overall dimensions of the alarm housing 1 meet the requirements of length ≤ 60mm, width ≤ 30mm, and height ≤ 15mm. The interior has reserved mounting chambers for the electronic components 2 and batteries. Each component is fixed in the chamber by screws or clips.

[0032] The alarm housing 1 is made of ABS plastic, with overall dimensions of 55mm (length), 28mm (width), and 12mm (height) (meeting the requirement of ≤60mm (length), ≤30mm (width), and ≤15mm (height)). An internal cavity is reserved for the installation of the electronic components 2 and the power supply unit, with dimensions of 50mm (length), 25mm (width), and 10mm (height). The housing surface is IPX4 waterproofed (achieved through sealing rings and a waterproof coating). First, the rotating base 3 is fixed to the left outer wall of the alarm housing 1 using M2 screws. Then, the rotating shaft 4 is inserted into the rotating groove of the rotating base 3. The outer side of the rotating shaft 4 is secured with an interference fit clamp 5, ensuring that the clamp 5 can rotate 360° around the rotating shaft 4 without jamming. Next, the buzzer 6, with a sound pressure level of 100dB and a frequency response of 20Hz-20kHz, is fixed to the inner back wall of the alarm housing 1 using a snap-fit ​​structure. The pins of the buzzer 6 have pre-drilled interfaces for soldering to the PCB circuit board.

[0033] Prepare a PCB circuit board with dimensions of 48mm × 24mm, and solder the various modules onto the board according to the circuit design:

[0034] The main control module uses an STM32L431RCT6 low-power microcontroller, which is soldered to the middle of the PCB circuit board. Its IO pins are reserved for communication interfaces with the alarm module, the low-power Bluetooth positioning module, and the signal transmission module.

[0035] The surface-mount LED beads (model: 0603 red high brightness) of the alarm module are soldered to the edge of the PCB circuit board, ensuring that the center of the LED bead is aligned with the pre-set light-transmitting hole (3mm in diameter) on the front of the alarm housing 1;

[0036] The low-power Bluetooth positioning module uses a chip adapted to the Bluetooth 5.3 protocol, compatible with the Nordic architecture, with an operating frequency of 2400MHz-2483.5MHz. It is soldered to the left side of the PCB circuit board, and its SPI interface is electrically connected to the corresponding pin of the main control module to ensure an unobstructed transmission distance of ≥20 meters.

[0037] The signal transmission module is integrated into the Bluetooth positioning chip and communicates with the main control module through the chip's UART interface. It also includes an iOS 15.1 and above compatibility program, supporting only Apple phones and tablets.

[0038] The power supply unit's 140mAh lithium polymer battery is sized to fit the reserved space in the chamber. It is soldered to the power interface of the PCB circuit board via wires, with a wire length of 5mm reserved to ensure that the battery can be stably placed into the battery slot inside the casing.

[0039] The soldered PCB is fixed in the mounting chamber inside the siren housing with four M1.5 screws, ensuring that the LED beads are aligned with the front light-transmitting hole and that the buzzer pins are soldered to the corresponding pads on the PCB. Then, the siren trigger button (touch button, model: TS-1185) is embedded into the pre-set button hole on the surface of the housing, and the button pins are soldered to the trigger interface on the PCB. Finally, a USB-C female connector hole is opened at the bottom of the siren housing, and the USB-C female connector (model matching charging requirements) is fixed and soldered to the charging circuit on the PCB. The upper and lower covers of the housing are closed and double-secured with clips and screws to complete the overall assembly.

[0040] Pressing the trigger button on the surface of the alarm casing sends a low-level trigger signal to the main control module (STM32L431RCT6). Upon receiving the signal, the main control module immediately outputs a high-level command to the alarm module, controlling the LED beads to flash at a frequency of 1Hz, with a red light brightness ≥5000mcd. Simultaneously, the buzzer emits a continuous 100dB alarm sound, with a frequency response covering 20Hz-20kHz. Pressing the trigger button again causes the main control module to receive a stop signal, and the alarm module stops working. The debugging results show that the alarm function response time is ≤0.5s, and the alarm function is normal during the waterproof test.

[0041] Location function debugging:

[0042] Step 1: Pair the LT-T93 alarm anti-loss device with an Apple phone running iOS 15.1 or later via Bluetooth. Complete the device binding in the Apple Find My app. The binding process is achieved through Bluetooth communication between the signal transmission module and the phone.

[0043] Step 2: Set the broadcast interval of the low-power Bluetooth positioning module to 5 seconds. This can be achieved through the software configuration of the main control module. Take the alarm anti-loss device to an open outdoor area and test the Bluetooth unobstructed transmission distance to ensure that the signal is uninterrupted within a range of 20 meters.

[0044] Step 3: Another connected iOS device within a 20-meter radius (iOS 15.1 or later) with the Find My Network feature enabled will automatically collect the Bluetooth broadcast signal from the alarm anti-loss device, including the device's unique MAC address, and upload the signal along with its own GPS location information (error ≤ 5 meters) to Apple's Find My server.

[0045] Step 4: Users can refresh the "Find" APP by binding their mobile phones to view the real-time location of the alarm anti-loss device (display error ≤ 8 meters), and the location data is updated every 5 seconds to verify that the broadcast and signal transmission functions of the low-power Bluetooth positioning module are normal.

[0046] After fully charging the 140mAh lithium polymer battery, the alarm anti-loss device is put into normal working condition. Only the low-power Bluetooth positioning module broadcasts periodically without triggering the alarm, and the battery life is continuously recorded. The debugging results show that the device tag can standby time up to 3 months, which meets the design target. When the battery power is lower than 10%, the main control module controls the LED beads to flash at a frequency of 2Hz to indicate charging. The charging time is ≤1.2 hours when connected to a 5V / 1A charger through the USB-C female interface. During the charging process, the charging circuit automatically realizes overcharge protection and there is no abnormal heat generation.

[0047] Working principle: Taking key anti-loss as a typical use case, the specific application method of the alarm anti-loss device of model LT-T93 is explained: Rotate the clamp on the left side of the alarm housing to open the clamp to a 15° angle and clamp it on the metal ring of the key ring. After releasing the clamp, the clamp remains fixed under the damping action of the rotating shaft, ensuring that the alarm anti-loss device is carried synchronously with the key and there is no risk of falling off. The IPX4 waterproof design can cope with carrying scenarios in rainy weather.

[0048] When a key is accidentally dropped into a corner of the room, the user can press the alarm trigger button. The flashing LED lights and the loud 100dB alarm sound will quickly locate the key, avoiding a long search.

[0049] When keys are forgotten in the office, users can use the Find My Apple App on an iPhone running iOS 15.1 or later to locate the keys on their way home. Thanks to the 20-meter Bluetooth transmission range and network positioning, there is no need to return to the office to confirm.

[0050] In daily use, the low-power Bluetooth positioning module (Bluetooth version 5.3) only broadcasts signals periodically (power consumption ≤8μA), and the main control module operates intermittently (average power consumption ≤5μA). Paired with a 140mAh lithium polymer battery, it can achieve 3 months of standby time. The overall device has low power consumption and does not require frequent charging. It is only compatible with Apple iOS 15.1 and above devices, which optimizes signal compatibility and functional stability, and solves the pain points of short battery life and poor compatibility of traditional anti-loss devices.

Claims

1. A theft alarm comprising an alarm housing (1), characterised in that: An electronic component (2) is fixedly installed on the right side of the alarm housing (1), and a buzzer (6) is fixedly installed on the back of the alarm housing (1). The electronic component (2) includes a main control module, an alarm module, a low-power Bluetooth positioning module and a signal transmission module, and each module is electrically connected through a PCB circuit board; The main control module uses an STM32L4 series low-power microcontroller and is communicatively connected to the alarm module, the low-power Bluetooth positioning module, the signal transmission module, and the power supply unit. The alarm module includes surface-mount LED beads. The low-power Bluetooth positioning module uses a Nordic nRF52832 chip and is electrically connected to the main control module. The signal transmission module is electrically connected to the low-power Bluetooth positioning module and the main control module. The power supply unit uses a 140mAh lithium polymer battery and is electrically connected to the main control module.

2. The alarm anti-lost device according to claim 1, characterized in that: The alarm housing (1) is made of ABS plastic. An alarm trigger button is provided on the surface of the housing. The button is electrically connected to the main control module. Pressing the button can send an alarm trigger signal to the main control module. After receiving the signal, the main control module controls the alarm module to start.

3. The alarm anti-lost device according to claim 1, characterized in that: The bottom of the alarm housing (1) is provided with a USB-C female charging interface. The charging interface is electrically connected to the lithium polymer battery of the power supply unit through a wire to replenish the battery power.

4. The alarm anti-lost device according to claim 1, characterized in that: The surface-mount LED beads are disposed on the front of the alarm housing (1), and the housing has a light-transmitting hole corresponding to the position of the LED beads; the sound pressure level of the buzzer (6) is ≥100dB, and when the alarm module is activated, the LED beads emit red flashing light, and the buzzer (6) emits an alarm sound simultaneously.

5. The alarm anti-lost device according to claim 1, characterized in that: The low-power Bluetooth positioning module supports the Bluetooth 5.3 protocol and operates in the frequency range of 2400MHz-2483.5MHz. It can periodically broadcast Bluetooth signals at preset intervals of 1-10 seconds. The signal transmission module can receive Bluetooth broadcast signals collected by nearby smart devices.

6. The alarm anti-loss device according to claim 1, characterized in that: A steering seat (3) is fixedly installed on the left side of the alarm housing (1). A rotating shaft (4) is rotatably connected inside the steering seat (3). A clamp (5) is fixedly installed on the outside of the rotating shaft (4). The clamp (5) can rotate around the rotating shaft (4) and is used to clamp and fix the alarm anti-loss device to clothing, backpack straps or keychains.

7. The alarm anti-lost device according to claim 1, characterized in that: The overall dimensions of the alarm housing (1) meet the requirements of length ≤ 60mm, width ≤ 30mm, and height ≤ 15mm. An installation chamber for the electronic components (2) and battery is reserved inside. Each component is fixed in the chamber by screws or clips.

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