Realization of real-time monitoring and voice reminding of vehicle driving status by single chip microcomputer

1. Main functions

1. Driving condition monitoring

The vehicle voice prompter can monitor the road conditions of the vehicle (good or bad (whether the vehicle bumps are serious); can monitor the driving of the vehicle in fog, rain and night; can monitor the driver's mobile phone while driving, and stop After the trip, the mobile phone in the car has a phone call to monitor; it can monitor continuous long-distance driving; it can monitor the driver's drunk driving; it can monitor whether the door is closed while driving, and it can monitor illegally started vehicles, etc. .

2. Voice prompts for real-time monitoring

(1) When starting the vehicle, there will be a voice prompt "Wish you a happy journey!"

(2) Three minutes after starting the vehicle. There will be a voice prompting you to fasten your seat belt, "For your safety, please fasten your seat belt."

(3) When the road condition is not good, there will be a voice prompt of "The road condition is not good, please pay attention to safety".

(4) When the vehicle is driving in rainy weather, there will be "driving in rainy weather, please pay attention to safety". And prompt every 30 minutes. If the vehicle is not driving in the rain within 30 minutes, the voice prompt will stop for the next period of time.

(5) When driving in foggy weather, there will be a voice prompt of "Foggy driving, please pay attention to safety". The prompting method is the same as driving on a rainy day.

(6) When the vehicle is driving at night, there will be a voice prompt of "Driving at night, please pay attention to safety".

(7) When making a phone call while driving, there will be a voice prompt "During driving. Please do not call".

(8) During the stop, if there is a phone call, there will be three consecutive voice prompts of "You have a call, please answer".

(9) When there is excessive drinking, there will be a voice prompt "For your safety, please do not drive". And prompt every 5 minutes (can also increase the prohibition of vehicle starting function).

(10) When the vehicle has been driving continuously for more than 4 hours. There will be a voice prompt every 10 minutes "The driving time is too long, please continue after a break".

(11) During vehicle startup or driving. If the door is not closed properly, there will be a voice prompt "The door is not good, please check".

(12) If there are criminals using illegal means to start the vehicle, there will be a loud warning voice of "illegal driving of this vehicle".

3. Function expansion anti-theft function: After illegally starting the vehicle, continuously dial the set phone number to show the alarm. The telephone number can be set to 3-5 according to actual needs.

Second, the circuit principle

The block diagram to realize the above functions is shown in the right figure, and the circuit is shown in the figure below. The circuit principles of each part are now introduced as follows:

1. Signal detection section

(1) Start detection

The vehicle start detection is realized by the displacement sensor detection, and the detection circuit is composed of the displacement sensor, U1D and other components in the figure below. When the displacement sensor detects the displacement signal and undergoes the U1D amplification and shaping process, it transmits the signal to the U3 (5) pin, which is used for vehicle startup detection recognition and prompting.

When the car key is powered on, the control core will initialize all detection functions. The first function of detection is to see if there is a signal on U3 (5) pin and whether it reaches a certain level. Because the signal output by the displacement sensor is an analog signal, the faster the movement acceleration. The larger the output. Therefore, the U3 (5) pin is set as an analog sampling port, and vehicle startup detection can be easily achieved. When the start signal is detected, the prompter will issue a voice prompt "Wish you a happy journey!"

Three minutes after the vehicle starts, in order to remind the driver to fasten the seat belt, there is a voice prompt "For your safety, please fasten the seat belt".

(2) Detection of driving conditions

During the driving process of the vehicle, the road surface will be very poor, causing the vehicle to bump or cause other safety accidents. The detection of the driving road condition of the vehicle is performed by the mercury switch detection signal. When the road surface is stable, the mercury switch will generally not operate, and the U3 (28) pin is detected as a low level, but when encountering poor road conditions. Then it can make the mercury switch break. That is, the high-level pulse appears on the U3 (28) pin, which can detect the information of bad road conditions.

When the vehicle has a large bump, the prompter will have a voice prompt "The road is not good, please pay attention to safety". The prompt method is that after the first prompt, the second prompt will appear after 30 minutes.

As a mobile advertising display, Vehicle LED Display has precise advertising positioning and is widely used in public transport, taxis, case trains and family cars. It is widely used in outdoor image advertisement, information publication, activity advertisement, mobile background stage, information media and live broadcast of events, etc. its products are effective and flexible and widely used.

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Features of Vehicle Led Display:

1. There is a unified operation background. Through GPS, you can know the specific location of each on-board screen. GPRS wireless replacement product content can play all the specified content partially. The above operations can be realized by computer and mobile phone


2. Mobile advertising has stronger communication and better effect. For vehicle mounted display screen, it has been in a state of motion, and advertising information has been more widely spread, with stronger communication ability and larger coverage area than fixed platform.


3. Vehicle Led Display adopts high brightness LED lamp beads, which can be seen clearly in the sun. The product has UV resistance in the sun, and the protection level reaches IP65, which is suitable for all-weather playback.


4. Ultra thin design of the product, allowing disassembly and assembly, reducing the space occupied in the car


5. Product module design, reliable and stable performance, power supply, system card, separate device, more stable product, more convenient maintenance


6. Led vehicle screen with GPS function can accurately know the screen position and operation status, including vehicle speed, driving direction, alarm status, etc.


7. Vehicle LED Display add brick and tile to the bright urban environment and become a beautiful scenic spot.

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Original title of structure:

1. The screen adopts wide voltage, which can be applied to any vehicle in any occasion.


2. Single box design, according to customer requirements, can be iron box, can be aluminum box.


3. The system adopts group network function, which can control all vehicle screens individually. Even if the screen body is not in the same city, it can send specified and information through GPRS.


4. The screen body has an understanding of the lifting device, and the height can be adjusted according to the customer's requirements.

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Vehicle LED Display

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Shenzhen Vision Display Technology Co,.LTD , https://www.ledvdi.com

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