CN106627861A - Bicycle anti-theft device - Google Patents

Abstract

The invention discloses a bicycle anti-theft device which comprises a microprocessor, a vibration sensor and a position sensor. The microprocessor is connected with the vibration sensor and the position sensor; the microprocessor reads data of the vibration sensor to judge that a bicycle vibrates and then reads data of the position sensor and processes the data of the position sensor to judge whether the bicycle is stolen. According to the bicycle anti-theft device, whether the bicycle vibrates or not is detected through the vibration sensor, when the bicycle vibrates, the movement locus of the bicycle is obtained through the position sensor, the anti-theft identification speed of the bicycle is greatly increased, quick responding can be performed when the bicycle is stolen, and the accurate rate of anti-theft identification is increased.

Description

bicycle anti-theft device

technical field

The invention relates to bicycle safety protection, and more specifically relates to a bicycle anti-theft device.

Background technique

In daily life, bicycle travel is popular among students and salarymen because of its convenience, environmental protection and other factors. However, how to solve the problem of bicycle anti-theft has become a common worry for many car owners. At present, there are many anti-theft methods for bicycles, such as using an infrared/vibration module to detect whether the bicycle is vibrating, or using a GPS locator to detect whether the bicycle is moving in a large range to achieve bicycle anti-theft. Most of these methods are too simple, and there are generally problems such as low accuracy rate of anti-theft identification, or insufficient response speed of anti-theft identification.

Contents of the invention

Aiming at the shortcomings of the prior art, the object of the present invention is to provide an anti-theft device for bicycles, which improves the speed and accuracy of anti-theft identification of bicycles.

In order to achieve the above object, the technical solution of the present invention is: a bicycle anti-theft device, including a microprocessor, a shock sensor, and a position sensor, and the microprocessor is connected to the shock sensor and the position sensor respectively; the microprocessor reads the data of the shock sensor After judging that the bicycle is vibrating, read the data of the position sensor and process it to judge whether the bicycle is stolen.

As an improvement of the present invention, the bicycle anti-theft device of the present invention also includes a GPS locator connected with the microprocessor.

As an improvement of the present invention, the bicycle anti-theft device of the present invention also includes a camera connected to the microprocessor.

As an improvement of the present invention, the position sensor includes a three-axis gyroscope, a three-axis accelerometer, an expandable digital motion processor and an I2C interface, and the position sensor is connected to the microprocessor through the I2C interface.

As an improvement of the present invention, the step of reading and processing the data of the position sensor by the microprocessor includes: (1) turning on the digital motion processor; (2) reading the three-axis acceleration, three-axis angular velocity, Quaternion, fused data Euler angles, coordinate transformation of the obtained acceleration, and obtain the three-axis acceleration vector of the xyz coordinate system; (3) set the filter, filter the acceleration value, and use the three-axis acceleration to time The double integral calculates the displacement of the bicycle in the three directions of xyz during the period when the bicycle vibrates; (4) judge whether the bicycle is lifted by the Euler angle and the displacement in the vertical direction, and if it is lifted, the displacement also occurs in the xy direction It is considered stolen and an alarm is issued.

As an improvement of the present invention, the step of starting the digital motion processor includes: (1) initializing the position sensor and judging whether it is successful, if so, proceed to the next step, if not, the program enters an endless loop; (2) Position sensor setting and judging whether it is successful, if yes, proceed to the next step, if not, the program enters an endless loop; (3) Fifo setting and judging whether it is successful, if yes, proceed to the next step, if not, then the program Enter an infinite loop; (4) Set the sampling rate and judge whether it is successful, if so, go to the next step, if not, the program enters an infinite loop; (5) Set the reference plane and judge whether it is successful, if so, go to the next step One step, if not, the program enters an endless loop; (6) Turn on the function of the digital motion processor and judge whether it is successful, if so, proceed to the next step, if not, the program enters an endless loop; (7) set the fifo sampling frequency Determine and judge whether it is successful, if so, enter the next step, if not, the program enters an infinite loop; (8) whether the digital motion processor is enabled successfully, if so, proceed to the next step, if not, the program enters an infinite loop Loop; (9) Turn on the digital motion processor successfully.

As an improvement of the present invention, if the microprocessor judges that the bicycle is stolen, it can send a reminder message to the owner's mobile phone, and the owner can send an instruction to the server to open the GPS locator to check the specific location of the bicycle after receiving the reminder message.

As an improvement of the present invention, when an abnormality is detected but it is impossible to determine whether the bicycle is stolen or not, the camera is turned on, and the photos taken can be uploaded to the server through real-time image transmission and sent to the owner's mobile phone to determine whether the bicycle is stolen or not. stolen.

Compared with the prior art, the bicycle anti-theft device of the present invention uses a vibration sensor to detect whether the bicycle vibrates, and when the bicycle vibrates, the motion track of the bicycle is obtained by the position sensor, so that the speed of the anti-theft recognition of the bicycle is greatly improved, and when the bicycle is stolen At the same time, it can respond quickly to improve the accuracy of anti-theft identification.

Description of drawings

The structure and beneficial technical effects of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

Figure 1 is a schematic diagram of the composition of the bicycle anti-theft device of the present invention.

Fig. 2 is a block diagram of the anti-theft detection process of the bicycle anti-theft device of the present invention.

detailed description

In order to make the purpose of the invention, technical solution and beneficial technical effects of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementations described in this specification are only for explaining the present invention, not for limiting the present invention.

Please refer to Fig. 1, bicycle anti-theft device of the present invention comprises position sensor, shock sensor, microprocessor and GPS locator; The motion processor DMP and an I2C interface; the microprocessor is STM32F103, and the MPU6050 module is electrically connected to the microprocessor through the I2C interface; the shock sensor is SW-18010-P, and the shock sensor integrates a digital output port. The digital output port is electrically connected to the microprocessor; the GPS locator is NEO-6M, and the GPS locator integrates a UART interface, and the GPS locator is electrically connected to the microprocessor through the UART interface. When the vibration of the bicycle is detected, the microprocessor uses the DMP library to drive the position sensor to collect the original data of three-axis acceleration, three-axis angular velocity and quaternion to judge the attitude of the bicycle, and to determine whether the bicycle is stolen and send a reminder message to the owner With the mobile phone, the owner can send specific instructions to the server through the APP to view the photos of the parking scene in real time to determine whether the bicycle is stolen, or check the location of the bicycle through GPS. When an abnormality is detected but it is impossible to determine whether the bicycle is stolen, the camera is turned on, and the photos taken are uploaded to the server and sent to the owner's mobile phone through real-time image transmission to determine whether the bicycle is stolen.

Please refer to Fig. 2, the anti-theft detection step process of the bicycle anti-theft device of the present invention specifically includes the following steps: (1) STM32 initialization; (2) MPU6050 initialization; (3) vibration sensor initialization; (4) STM32 writes the DMP library into MPU6050; (5) STM32 reads the data of the vibration sensor module; (6) Does the bicycle vibrate? If so, go to the next step; Arguments, fused data to obtain Euler angles, and coordinate transformation of the obtained three-axis acceleration to obtain the xyz three-axis acceleration vector; The double integral is used to calculate the displacement of the bicycle in the three directions of xyz during the vibration period; (9) judge whether the bicycle is lifted by the Euler angle and the displacement in the vertical direction, and if it is lifted, the displacement also occurs in the xy direction It will be regarded as stolen and send an alarm and send a SMS reminder to the car owner, and enter the next step. If not, cancel the alarm and re-enter b; (10) When the car owner receives the SMS anti-theft reminder message, he can send a specific command to the server to open the vehicle. The camera takes pictures of the scene and sends them to the user's mobile phone in real time for the user to judge whether the bicycle is stolen. If the bicycle is stolen, the owner can send a specific command to the server to open the car GPS to check the specific location of the bicycle. If not, turn off the bicycle alarm;

Opening the internal DMP of the MPU6050 includes the following steps: MPU6050 initialization; whether the MPU6050 initialization is successful, if so, proceed to the next step, if not, the program enters an endless loop; sensor setting, whether the sensor setting is successful, if so, proceed to the next step , if not, the program enters an infinite loop; Fifo setting and judging whether it is successful, if so, proceed to the next step, if not, the program enters an infinite loop; DMP sampling rate setting; whether the sampling rate setting is successful, if so, Then proceed to the next step, if not, the program enters an infinite loop; set the reference plane and judge whether it is successful, if yes, enter the next step, if not, the program enters an infinite loop; enable the DMP function, and check whether the DMP function is successful , if yes, proceed to the next step, if not, the program enters an infinite loop; the fifo sampling frequency is set and judges whether it is successful, if so, enters the next step, if not, the program enters an infinite loop; DMP is enabled, DMP Whether the enabling is successful, if so, go to the next step, if not, the program enters an endless loop; the DMP is successfully turned on.

The bicycle anti-theft device of the present invention uses the MPU6050 to obtain the displacement and attitude of the bicycle, drives the MPU6050 through the DMP library to collect fifo processed data, and directly obtains the three-axis acceleration, three-axis angular velocity, and Euler angle without complex Kalman filtering Algorithm, reduce the burden on the microprocessor, calculate the displacement of the bicycle through the quadratic integral algorithm, no need to use the displacement sensor, and save costs.

According to the disclosure and teaching of the above specification, those skilled in the art to which the present invention pertains can also make appropriate changes and modifications to the above embodiment. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should also fall within the protection scope of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for convenience of description and do not constitute any limitation to the present invention.

Claims (8)

1. a kind of theft-proof device for bicycle, including microprocessor, shock sensor, it is characterised in that also including position sensor, Microprocessor is connected respectively with shock sensor, position sensor；The data of microcomputer reads shock sensor judge voluntarily After car shakes, then reading position sensor data and processed to judge whether bicycle stolen.

2. theft-proof device for bicycle according to claim 1, it is characterised in that also include what is be connected with the microprocessor GPS locator.

3. theft-proof device for bicycle according to claim 1, it is characterised in that also include what is be connected with the microprocessor Camera.

4. theft-proof device for bicycle according to claim 1, it is characterised in that the position sensor includes three axis accelerometer Instrument, three axis accelerometer, extendible digital moving processor and I2C interfaces, position sensor is by I2C interfaces and microprocessor Device connects.

5. theft-proof device for bicycle according to claim 4, it is characterised in that the microcomputer reads position sensor Data and include the step of processed：

(1) the digital moving processor is opened；

(2) 3-axis acceleration, three axis angular rates, quaternary number are read, fused data Eulerian angles are sat to resulting acceleration Mark conversion, obtains xyz coordinate system 3-axis acceleration vectors；

(3) wave filter is set, process is filtered to accekeration, the double integral of time is asked respectively by 3-axis acceleration Go out bicycle and displacement of the vibrations this period in tri- directions of xyz occurs；

(4) judge whether bicycle is lifted by Eulerian angles and vertical direction displacement, if being lifted and also occurring in xy directions Displacement is then considered as stolen and sends alarm.

6. theft-proof device for bicycle according to claim 5, it is characterised in that open the step of the digital moving processor Suddenly include：

(1) initialized location sensor and judge whether successfully, if so, then carry out next step, if it is not, then program is entered and extremely followed Ring；

(2) position sensor sets and judges whether successfully, if so, then carries out next step, if it is not, then program entrance is extremely followed Ring；

(3) Fifo sets and judges whether successfully, next step is if so, then carried out, if it is not, then program enters endless loop；

(4) sampling rate sets and judges whether successfully, next step is if so, then carried out, if it is not, then program enters endless loop；

(5) reference planes set and judge whether successfully, if then into next step, if not, then program enters endless loop；

(6) open digital moving processor function and judge whether successfully, next step is if so, then carried out, if it is not, then program is entered Enter endless loop；

(7) fifo sample frequencys set and judge whether successfully, if then into next step, if not, then program is entered and extremely followed Ring；

(8) whether digital moving processor enable is successful, next step is if so, then carried out, if it is not, then program enters endless loop；

(9) digital moving processor success is opened.

7. theft-proof device for bicycle according to claim 2, it is characterised in that if microprocessor judges bicycle is stolen, Reminding short message is sent to the mobile phone of car owner, car owner sends instruction unpack GPS locator after reminding short message is received to server Check the particular location of bicycle.

8. theft-proof device for bicycle according to claim 3, it is characterised in that when detecting abnormal but cannot judge voluntarily Car opens camera when whether being in stolen status, by the way that realtime graphic transmission is the photo upload server clapped and is sent to The mobile phone of car owner, determines whether bicycle is stolen with this.