CN103802722A - Intelligent automobile backing image and ultrasonic ranging system - Google Patents

Abstract

The invention relates to an intelligent car reversing image and ultrasonic ranging system, comprising a single-chip microcomputer, a camera module, an ultrasonic ranging module, a liquid crystal display screen, an LCD display screen, an LED display light and a buzzer. Module, ultrasonic ranging module, liquid crystal display, LCD display, LED display light and buzzer are connected, and described camera module is connected with liquid crystal display. Compared with the prior art, the invention has the advantages of fast response speed, strong processing ability, good reliability, small volume, high modularization degree, and convenience for mass production.

Description

An intelligent car reversing image and ultrasonic ranging system

technical field

The invention relates to an automobile reversing radar related technology, in particular to an intelligent automobile reversing image and ultrasonic distance measuring system.

Background technique

The reversing image and ultrasonic distance measuring system are safety auxiliary devices when the car is parked or reversed. It can inform the driver of the surrounding obstacles with sound or a more intuitive display, and relieve the driver of the front and rear when parking, reversing and starting the vehicle. It can eliminate the troubles caused by left and right visits, and help the driver eliminate the defects of blind spots and blurred vision, and improve driving safety.

Usually, the reversing radar is composed of ultrasonic sensor, controller and display (or buzzer) and other parts. The reversing radar generally adopts the principle of ultrasonic ranging. Under the control of the controller, the sensor emits an ultrasonic signal. When encountering an obstacle, an echo signal is generated. After the sensor receives the echo signal, the controller performs data processing and judges The position of the obstacle is displayed by the monitor and other warning signals are sent out, so as to be warned in time, so that the driver can know what is in mind when reversing, and make reversing easier. In a few years, with the development of technology and changes in user needs, the reversing radar has gone through roughly six generations of development.

The first generation: Remind through the horn when reversing. In a sense, it does not directly help the driver, not a real reversing radar. The price is cheap, and it is basically an obsolete product.

The second generation: the driver is prompted by different sounds of the buzzer. This is the real beginning of the parking radar system. But there is no voice prompt, and there is no distance display. Although the driver knows that there is an obstacle, he cannot determine how far the obstacle is from the car, which is not very helpful to the driver.

The third generation: the digital band displays the specific distance or distance range. The third-generation product combines digital and band together, but it is more practical, but it is not very beautiful to install in the car.

The fourth generation: LCD screen dynamic display. There is a qualitative leap in this generation of products, especially the dynamic display system began to appear on the screen display. However, although the liquid crystal display is exquisite in appearance, it has high sensitivity and weak anti-interference ability, so there are many false alarms.

The fifth generation: Magic mirror reversing radar. Combining the advantages of previous generations of products, it adopts the latest bionic ultrasonic radar technology and is equipped with high-speed computer control. It can accurately detect obstacles within 2 meters around the clock, and remind the driver with different levels of sound prompts and intuitive displays. .

The sixth generation: integrated audio-visual system. It has added a lot of functions on the basis of the fifth-generation product, and belongs to the sixth-generation product, which is specially produced for high-end cars. From the appearance point of view, this system is more refined and elegant than the fifth-generation product; from the function point of view, it not only has all the functions of the fifth-generation product, but also integrates the audio-visual system of high-end cars. Watch DVD images. But the implementation cost is relatively high.

Contents of the invention

The object of the present invention is to provide an intelligent car reversing image and ultrasonic device with fast response speed, strong processing capacity, good reliability, small size, high modularization degree and convenient mass production in order to overcome the defects of the above-mentioned prior art. ranging system.

The purpose of the present invention can be achieved through the following technical solutions:

A kind of intelligent car reversing image and ultrasonic distance measuring system, it is characterized in that, comprise single-chip microcomputer, camera module, ultrasonic distance measuring module, liquid crystal display screen, LCD display screen, LED display lamp and buzzer, described single-chip microcomputer is respectively connected with The camera module, the ultrasonic ranging module, the liquid crystal display, the LCD display, the LED display light and the buzzer are connected, and the camera module is connected with the liquid crystal display;

The camera module needs to transmit the collected images to the single-chip microcomputer. After the single-chip processing, the real-time collected images will be displayed on the LCD screen. At the same time, the ultrasonic ranging module will transmit the measured signal to the single-chip microcomputer. After the single-chip processing, the specific distance will be displayed on the LCD screen. , and control the alarm operation of the LED display lamp and the buzzer through the distance.

Described single-chip microcomputer is STM32 single-chip microcomputer.

The liquid crystal display is a 2.8-inch TFT color liquid crystal display.

The LED display lamp includes three lights of red, yellow and green, and the buzzer is a buzzer capable of emitting three frequencies.

The single-chip microcomputer controls the alarm operation of the LED display light and the buzzer through the distance, specifically as follows:

If the distance is less than the set ultra-close threshold, the red light is on, and the buzzer sounds short of breath, indicating danger; if the distance is between the ultra-close threshold and the near threshold, the yellow light is on, and the buzzer sounds gently, indicating It is about to enter the danger zone; if the distance is greater than the close threshold, the green light will be on and the buzzer will not sound an alarm.

The ultra-near threshold is 5-10 cm, and the near-threshold is 15-25 cm.

The system is powered via USB.

The system adopts modular integrated design.

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

1. Fast response speed and strong processing ability: This system adopts STM32 series single-chip microcomputer, digital camera and serial port ultrasonic distance measuring module, which has the advantages of strong video acquisition ability and fast ultrasonic data acquisition speed.

2. Good reliability and small size: the digital camera has stable signal transmission, high reliability and very small size. The serial port type ultrasonic receiving method is fast and convenient, so ultrasonic has unique advantages in measurement.

3. High degree of modularization, convenient for mass production: the components used in the system are all modular integration, including camera module, ultrasonic module, TFT display module and single-chip microcomputer, which is more suitable for large-scale production and has anti-interference ability Strong, easy coding, good confidentiality and other advantages.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

Example

As shown in Figure 1, an intelligent car reversing image and ultrasonic ranging system includes a single-chip microcomputer 1, a camera module 2, an ultrasonic ranging module 3, a liquid crystal display 4, an LCD display 5, an LED display light 6 and a buzzer device 7, the single-chip microcomputer 1 is respectively connected with the camera module 2, the ultrasonic distance measuring module 3, the liquid crystal display 4, the LCD display 5, the LED display lamp 6 and the buzzer 7, and the described camera module 2 is connected with the liquid crystal display The screen 4 is connected; the camera module 2 will transmit the collected image to the single-chip microcomputer 1, and after processing by the single-chip microcomputer 1, the real-time collected image will be displayed on the liquid crystal display 4, and the ultrasonic ranging module 3 will transmit the measured signal to the single-chip microcomputer 1, and the single-chip microcomputer 1 After processing, the specific distance is displayed on the LCD display screen 5, and the alarm operation of the LED display lamp 6 and the buzzer 7 is controlled by the distance.

Described single-chip microcomputer is STM32 single-chip microcomputer. The liquid crystal display is a 2.8-inch TFT color liquid crystal display.

The LED display lamp includes three lights of red, yellow and green, and the buzzer is a buzzer capable of emitting three frequencies. The single-chip microcomputer controls the alarm operation of the LED display light and the buzzer through the distance, specifically as follows:

If the distance is less than the set ultra-close threshold, the red light is on, and the buzzer sounds short of breath, indicating danger; if the distance is between the ultra-close threshold and the near threshold, the yellow light is on, and the buzzer sounds gently, indicating It is about to enter the danger zone; if the distance is greater than the close threshold, the green light will be on and the buzzer will not sound an alarm. The ultra-near threshold is 5cm, and the near threshold is 20cm.

The inventive system is powered via USB and includes a reset button. The system adopts a modular integrated design, so the system is very compact and highly usable. There are four movable wheels under the system to more simulate the whole process of reversing the car. The appearance design is concise and the degree of visualization is high.

With its careful design, this system finally integrates all modules on one circuit board, which can better carry out subsequent development and mass production.

The camera module used in this system is the CF7670C-V2 module, which has the characteristics of strong video acquisition capability, fast response speed, and low power consumption. This module has the following characteristics:

1: FIFOAL422B with a large capacity of 380KB is very suitable for slow MCU to directly collect image data through I/O;

2: With 24MHZ active crystal oscillator;

3: With OV7670 necessary regulator LDO;

4: Ultra-wide single working power supply 3.3V --- 5V, io direct connection without level conversion, working temperature 0 degrees --- 50 degrees;

5: The lens is an all-glass lens, the lens (including the seat) is made of magnesium-aluminum alloy material, and the focal length of the lens is 3.6 mm in the 650nm band;

6: The PCB is a black FR-4 high-quality immersion gold board, which can effectively prevent PCB light leakage (if it is not black, there will be shadows on the light leakage screen);

7: The module size is 3*3cm (+/-0.5mm);

8: The module pins are 2X10 2.54 mm apart, which is convenient for directly connecting the I/O of the single-chip microcomputer to the image acquisition experiment.

The ultrasonic distance measuring module will occupy an IO port of the single chip microcomputer in use. After the power supply is connected, the distance measurement will be performed every 50ms inside the module, and a frame will be output from the pin OUT, including 4 8-bit data, and the frame format is: 0XFF+ H_DATA+L_DATA+SUM;

1.0XFF: It is the start data of a frame, used for judgment.

2.H_DATA: The upper 8 bits of the distance data.

3. L_DATA: The lower 8 bits of the distance data.

4.SUM: Data sum, used for validation. Its 0XFF+H_DATA+L_DATA=SUM (only lower 8 bits).

Among them, H_DATA and L_DATA synthesize 16-bit data, that is, the distance value in millimeters.

Claims (8)

1. a full automatic vehicle reverse image and ultrasonic ranging system, it is characterized in that, comprise micro controller system, camera module, ultrasonic distance measuring module, LCDs, LCD display, LED display lamp and buzzer phone, described micro controller system is connected with camera module, ultrasonic distance measuring module, LCDs, LCD display, LED display lamp and buzzer phone respectively, and described camera module is connected with LCDs;

Camera module will send micro controller system to the image collecting, after processing, micro controller system shows the image of Real-time Collection by LCDs, ultrasonic distance measuring module sends the signal of measurement to micro controller system simultaneously, micro controller system shows concrete distance by LCD display after processing, and controls the alarm operation of LED display lamp and buzzer phone by the distance of distance.

2. a kind of full automatic vehicle reverse image according to claim 1 and ultrasonic ranging system, is characterized in that, described micro controller system is STM32 micro controller system.

3. a kind of full automatic vehicle reverse image according to claim 1 and ultrasonic ranging system, is characterized in that, described LCDs is 2.8 cun of TFT chromatic liquid crystal screens.

4. a kind of full automatic vehicle reverse image according to claim 1 and ultrasonic ranging system, is characterized in that, described LED display lamp comprises green three lamps of reddish yellow, and described buzzer phone is the buzzer phone that can send three kinds of frequencies.

5. a kind of full automatic vehicle reverse image according to claim 4 and ultrasonic ranging system, is characterized in that, the alarm operation that micro controller system is controlled LED display lamp and buzzer phone by the distance of distance is specially:

If distance is less than the super near threshold value of setting, when red, buzzer phone sounds and shortness of breath, represents dangerous; If distance is between super nearly threshold value and nearly threshold value, amber light lights, and the sound that buzzer phone is mild represents to be about to enter dangerous area; If distance is greater than nearly threshold value, green light and buzzer phone do not give the alarm.

6. a kind of full automatic vehicle reverse image according to claim 5 and ultrasonic ranging system, is characterized in that, described super near threshold value is 5～10cm, and nearly threshold value is 15～25cm.

7. a kind of full automatic vehicle reverse image according to claim 1 and ultrasonic ranging system, is characterized in that, this system is powered by USB.

8. a kind of full automatic vehicle reverse image according to claim 1 and ultrasonic ranging system, is characterized in that, this system adopts modularization Integrated design.

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