CN101290346A - Wristband Positioning Device - Google Patents

Abstract

The wristband positioning device is an automatic detection and tracking device for the movement and static position of objects in the venue. It adopts short-distance broadband radio frequency technology and wristband structure design. It is a set of receiving and sending signals. Integrated wrist strap positioning device. The device comprises a control module (1), a wireless module (2), an acceleration sensor (3) and a power supply module (4); the output terminal of the acceleration sensor (3) is connected to the signal input terminal of the control module (1), and the control module (1) ) is connected with the wireless module (2) through the SPI bus, and various positioning signals are sent by the wireless module (2); wherein, the control module (1) adopts a model of C8051F9XX or MSP430FXXX series control chips, and the wireless module (2) adopts a model of The RF chip of CC1100, CC2500 or nrf9054, the acceleration sensor (3) is selected as MXR6150 or ADXL320, and the power module (4) is selected from a small and exquisite button lithium battery.

Description

Wristband Positioning Device

technical field

The invention relates to an important part of a positioning system, an automatic detection and tracking device for the movement of objects in a place and the position in a static state. It adopts short-distance broadband radio frequency technology and is designed with a wristband structure. A wrist-worn positioning device integrating receiving and sending signals.

Background technique

Electronic wristbands are generally used to identify objects within a specific range, such as detention centers, prisons, hospitals, etc. The existing electronic wristbands generally have simple functions. Usually, the situation that needs to be identified is written on the label, or the relevant information is input into the electronic label, and the electronic wristband is worn on the object's wrist. or the visual or machine reading of electronic tags; the supervised object (human prisoner) often has a strong sense of destruction and escape, and will often try to destroy the electronic wristband; when the supervised object (human prisoner) goes out to work or participate in other outdoor activities It may escape from the sight of police officers, and the automatic detection and tracking function of the moving and stationary positions of special objects has not been realized. Therefore, the above-mentioned problems of existence make society have great potential safety hazard.

Contents of the invention

Technical problem: This invention aims at places with high management requirements such as prisons and detention centers. We design a wireless wristband positioning device using the ISM frequency band. This device realizes high-precision positioning and human motion recognition for supervisors. In this way, the management needs of prisons and detention centers are fully met, and the goal of relying on science and technology for police power is truly realized.

Technical solution: The wireless wristband of the present invention includes four parts: a control module 1 , a wireless module 2 , an acceleration sensor 3 and a lithium battery 4 .

The output terminal of the acceleration sensor is connected to the signal input terminal of the control module, and the control module is connected to the wireless module through the SPI bus, and various positioning signals are sent by the wireless module; among them, the control module adopts the control chip of the model C8051F9XX or MSP430FXXX series, and the wireless module adopts The RF chip model is CC1100, CC2500 or nrf9054, the acceleration sensor is MXR6150 or ADXL320, and the power module is a small button lithium battery.

The "P1.0, P1.1, P1.2, P1.3, P1.7, P2.7" terminals of the control chip in the control module correspond to the "SCLK, SO (GDO1 ), SI, CSn, GDO2, GDO0" terminals, the "P1.5, P1.6, P2.6" terminals of the control chip are respectively connected to the "XOUT, YOUT, PD" of the acceleration sensor; the "P1.4" of the control chip "Terminal voltage sampling of lithium battery.

3 "SCLK, SO(GDO1), SI, CSn" of the radio frequency chip in the wireless module are configuration interfaces and data transmission interfaces, respectively connected to "P1.0, P1.1, P1.2, P1. 3" terminal, "GDO0, SO(GDO1), GDO2" terminal is the status indication interface of the radio frequency chip, respectively connected to the "P2.7, P1.1, P1.7" terminal of the control chip.

The positive output of the power module is connected to one end of the embedded metal wire of the wristband, and the other end of the metal wire is connected to the positive power of the control circuit; the negative output of the power module is connected to the negative power of the control circuit.

The "XOUT, YOUT" terminals of the acceleration sensor are signal acquisition output terminals, respectively connected to the "P1.5, P1.6" terminals of the control chip in the control module, and the "PD" terminals of the acceleration sensor are POWER DOWN configurations, connected to the control chip's "P2.6" pin, once the control chip sets "P2.6" high, the acceleration sensor will enter the POWER DOWN mode to reduce power consumption.

The voltage of the power module is divided by the first resistor R1 and the second resistor R2, and then connected to the AD input pin "P2.5" of the control chip.

Beneficial effect: the function and effect of the present invention are:

Positioning function: The wireless wristband cooperates with the system's RSSI-based wireless positioning algorithm to realize the positioning function.

Anti-fighting function: The wireless wristband detects the output signal of the acceleration sensor to obtain the movement information of the human body and realizes the "anti-fighting" function.

Anti-cutting function: The lithium battery of the wireless wristband provides power for the entire device through a circuit formed by the embedded metal wire in the wristband. Once the wristband is damaged and the wristband does not work, the control center will alarm.

Unique ID number: Each wireless wristband has a unique ID solidified into the memory of the control chip. Realize a globally unique ID number.

Low battery alarm function: The control chip detects the voltage by sampling the actual voltage of the lithium battery. Once the battery voltage is lower than the preset value, it sends a designated signal to the control center, and the control center will alarm and display the low voltage wireless wrist. with ID number.

Waterproof function: The structure of the wireless wristband adopts two cavities, that is, the connection cavity of the strap is separated from the assembly cavity of the circuit board, which further ensures the waterproof function of the product.

Description of drawings

Fig. 1 is a structural block diagram of the restraint wristband for criminals;

Fig. 2 is control chip and radio frequency chip interface;

Fig. 3 is anti-shearing circuit diagram;

Fig. 4 is the connection diagram of control chip and acceleration sensor;

Figure 5 is a circuit diagram of battery voltage sampling.

Detailed ways

1. Control module 1

The control chip of the model C8051F9XX or MSP430FXXX series is used to realize the control of the wireless module and the detection of the acceleration sensor and the battery voltage. The device control module adopts MSP430F2011 chip, which is a low-power single-chip microcomputer, the power supply voltage only needs 1.8V-3.6V, 16-bit simplified instruction system, 2KB+256B FlashMemory, 128BRAM; the package adopts 14 pins (TSSOP);

2. Wireless module 2

The wireless module adopts a radio frequency chip with high acceptance sensitivity to realize wireless data communication. The 7" end corresponds to the "SCLK, SO (GDO1), SI, CSn, GDO2, GDO0" of the RF chip; the device uses CC1100, a multi-channel RF transceiver, in a 4×4mm 20-pin QFP package.

3. Acceleration sensor 3

The acceleration sensor is MXR6150 or ADXL320, and the “P1.5, P1.6, P2.6” of the control chip are respectively connected to the “XOUT, YOUT, PD” of the acceleration sensor; the acceleration sensor can measure both static and dynamic acceleration, It is a high-precision, low-power IC chip accelerometer.

4. Lithium battery 4

The battery is a small button lithium battery. The "P1.4" of the control chip is connected to the voltage sampling of the battery. Once the battery voltage is lower than a preset value, it will send a signal to the control center, and the system will alarm and prompt replacement. Battery. The battery provides the power supply for the whole device through the loop formed by the metal wire embedded in the wristband. Once the wristband is damaged and the wristband does not work, the control center will alarm.

The invention adopts a low power consumption control chip, an ISM frequency band radio frequency chip, and a high-capacity lithium battery, and realizes low power consumption and super long standby time of the device through a working mode combining sleep and work. The system adopts high receiving sensitivity, digital received signal strength indicator (RSSI), wireless wake-up function (WOR) and automatic clearing channel assessment (CCA) radio frequency chip as the core of the wireless module, and cooperates with other modules of the system to achieve the following functions:

The structure and flow of each module of the product of the present invention will be described in detail below in conjunction with the accompanying drawings. The product of the invention is a wireless wristband sensor using the ISM frequency band, a device for high-precision positioning and human motion recognition of supervised objects.

The overall structural block diagram of the device is shown in Figure 1. The control chip is the core of the entire device, responsible for processing communication with the radio frequency chip, collecting and controlling the signal of the acceleration sensor, and detecting the battery voltage. The lithium battery is responsible for the power supply of the device. .

The interface between the control chip and the radio frequency chip is shown in Figure 2. Among them, the "SCLK, SO (GDO1), SI, CSn" of the radio frequency chip are the configuration interface and the data transmission interface, which are respectively connected to the "P1.0" of the control chip. , P1.1, P1.2, P1.3" On the one hand, it configures the working mode of the RF chip, and can read the working status and parameter configuration of the RF chip; on the other hand, it can also receive and send RF data. "GDO0, SO(GDO1), GDO2" of the radio frequency chip are the status indication interfaces of the radio frequency chip, which are respectively connected to "P2.7, P1.1, P1.7" of the control chip.

The anti-shearing circuit is shown in Figure 3. The output positive pole of the battery is connected to one end of the embedded metal wire in the wristband, and the other end of the metal wire is connected to the positive pole of the power supply of the control circuit; the negative output pole of the battery is connected to the negative pole of the power supply of the control circuit. The end of the wristband connected to the positive pole of the battery is separated from the positive pole of the battery before the wristband is worn. Only when the wristband is worn on the wrist of the supervised object, the control circuit of the wristband starts to work. Once the wristband is maliciously cut or destroyed, the control circuit will stop working, and the control center will alarm and display the number of the damaged wristband and the information of the wearer. The alarm delay generally does not exceed 15s.

The connection diagram between the control chip and the acceleration sensor is shown in Figure 4. The "XOUT, YOUT" of the acceleration sensor is the signal acquisition output terminal, which is respectively connected to the "P1.5, P1.6" of the control chip. The two tubes of the control chip The pin can be configured as the positive input of the comparator integrated in the control chip or configured as the input of the A/D integrated in the chip. The "PD" of the acceleration sensor is configured as POWER DOWN, and it is connected to the "P2.6" pin of the control chip. Once the control chip sets "P2.6" high, the acceleration sensor will enter the POWER DOWN mode to reduce power consumption.

The battery voltage sampling circuit is shown in Figure 5. The battery voltage resistors R1 and R2 are divided and connected to the AD input pin "P2.5" of the control chip. In this way, once the battery voltage is lower than the preset value, a signal will be sent to the control center, and the control center will give an alarm and display the number of the wristband and the information of the personnel who need to replace the battery.

It should be understood that, for those of ordinary skill in the art, after the design of the device of the invention is completed, the device can be transformed into other communication products, such as hospitals, kindergartens, etc., by slightly modifying the existing software or hardware Places that need to monitor the whereabouts of people have a wide range of application prospects. And all these changes or replacements should belong to the protection scope of the appended claims of the present invention.

Claims (6)

1, a kind of Wrist strap type positioning apparatus is characterized in that this device comprises control module (1), wireless module (2), acceleration transducer (3) and power module (4); The signal input part of the output termination control module (1) of acceleration transducer (3), control module (1) is joined by spi bus and wireless module (2), sends various positioning signals by wireless module (2); Wherein, it is C8051F9XX or MSP430FXXX series control chip that control module (1) adopts model, it is the radio frequency chip of CC1100, CC2500 or nrf9054 that wireless module (2) adopts model, it is MXR6150 or ADXL320 that acceleration transducer (3) is selected model for use, the small and exquisite lithium coin cells of volume that power module (4) is selected for use.

2, Wrist strap type positioning apparatus according to claim 1 is characterized in that " P1.0, P1.1; P1.2, P1.3, P1.7; P2.7 " end order correspondence of control chip in the described control module (1) connects " SCLK, SO (GDO1), SI; CSn, GDO2, GDO0 " end of radio frequency chip in the wireless module (2), " XOUT; YOUT, the PD " that " P1.5, P1.6, P2.6 " end of control chip connects acceleration transducer respectively is short; The voltage sample of " P1.4 " termination lithium battery of control chip.

3, Wrist strap type positioning apparatus according to claim 1 is characterized in that " SCLK, the SO (GDO1); SI, CSn " of radio frequency chip in the wireless module (2) is configuration interface, is again data transmission interface simultaneously, connect " P1.0, P1.1, P1.2; P1.3 " end of control chip respectively, " GDO0, SO (GDO1); GDO2 " end is the state indication interface of radio frequency chip, connect " P2.7, P1.1, P1.7 " end of control chip respectively.

4, Wrist strap type positioning apparatus according to claim 1 is characterized in that, the output cathode of power module (4) connects an end of wrist strap embedded metal silk, the positive source of other end Access Control circuit wiry; The power cathode of the output negative pole Access Control circuit of power module (4).

5, Wrist strap type positioning apparatus according to claim 1, it is characterized in that, " XOUT, YOUT " end of acceleration transducer (3) is the signals collecting output terminal, connects " P1.5; P1.6 " end of control chip in the control module (1) respectively, " PD " end of acceleration transducer is POWER DOWN configuration, connects " P2.6 " pin of control chip, in case control chip is put height with " P2.6 " end, acceleration transducer promptly enters POWER DOWN pattern, reduces power consumption.

6, Wrist strap type positioning apparatus according to claim 1 is characterized in that, AD input pin " P2.5 " end of the voltage of power module (4) Access Control chip after first resistance R, 1, the second resistance R, 2 dividing potential drops.

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