First, the main function
1. Driving condition monitoring
It can monitor whether the road condition of the vehicle is good/bad (whether the vehicle bump is serious); it can monitor the driving of the vehicle in foggy, rainy and nighttime; it can monitor the mobile phone of the driver during the driving, and the inside of the vehicle after the stop The mobile phone has a telephone to be monitored for monitoring; it can monitor continuous long-time driving; it can monitor the driver's drunk driving; can monitor whether the driving door is closed or not, and can monitor the illegal starting vehicle.
2. Voice prompts for real-time monitoring
(1) When starting the vehicle, there will be a voice prompt "I wish you a pleasant trip!" (2) Three minutes after starting the vehicle. You will be prompted to fasten the voice of the seat belt "For your safety, please fasten your seat belt".
(3) When the road conditions are not good, there will be a voice prompt that “The road is not good, please pay attention to safetyâ€.
(4) When the vehicle is driving on a rainy day, there will be “rainy driving, please pay attention to safetyâ€. And prompt every 30 minutes. If the vehicle is not driving in the rain within 30 minutes, the voice prompt will be stopped in the next time.
(5) When driving in a foggy day, there will be a voice prompt "Fog in the fog, please pay attention to safety". The reminder 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 safetyâ€, and the prompting method is the same as driving in rainy days.
(7) When you are on the phone while driving, there will be a voice prompt "Don't call."
(8) If there is a mobile phone call during the stop, there will be three consecutive voice prompts “You have a call, please answerâ€.
(9) When there is excessive drinking, there will be a voice prompt for “Do not drive for your safetyâ€. It is also prompted every 5 minutes (the vehicle start function can also be added).
(10) When the vehicle is driving continuously for more than 4 hours. There will be a voice prompt for "Too driving time is too long, please continue to drive after the break" every 10 minutes.
(11) On the way to start or drive the vehicle. If the door is not closed, there will be a voice prompt "The door is not beautiful, please check".
(12) If there are illegal elements using illegal means to start the vehicle, there will be a loud warning of "illegal driving of the vehicle".
3. Function extended anti-theft function: After illegally starting the vehicle, constantly dial the set phone number to show the alarm. The phone number can be set 3-5 according to actual needs.
Second, the circuit principle
The block diagram for implementing the above functions is shown on the right. The circuit is shown in the figure below. The circuit principle of each part is introduced as follows:
Signal detection section
(1) Start detection
The vehicle start detection is realized by the displacement sensor detection. The detection circuit is composed of the displacement sensor, U1D and other components in the following figure. When the displacement sensor detects the displacement signal and passes through the U1D amplification and shaping process, the signal is transmitted to the U3 (5) pin for vehicle detection detection and prompting.
When the car key is powered up, the control core will initialize all detection functions. The first function of the test is to see if there is a signal on the U3 (5) pin and whether it reaches a certain level. The signal output detected by the displacement sensor is an analog signal, and the faster the movement is. Then the output is larger. Therefore, setting the U3 (5) pin to the analog sampling port makes it easy to start the vehicle. When the start signal is detected, the prompter will give a voice prompt "I wish you a happy trip!"
After the vehicle is started for three minutes, in order to remind the driver to fasten the seat belt, there is a voice prompt for "Please fasten your seat belt for your safety."
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(2) Traveling road condition detection
During the running of the vehicle, the road surface is in poor condition, causing the vehicle to be bumped or other safety accidents. The vehicle road condition detection is detected by the mercury switch. When the road surface is stable, the mercury switch generally does not move, and the U3 (28) foot is detected as a low level, but when the road condition is poor. This will cause a break in the mercury switch. That is, a high-level pulse appears on the U3 (28) pin to detect a bad road condition.
When the vehicle has a large bump, the prompter will have a voice prompt that “The road is not good, please pay attention to safetyâ€. The way to prompt it is after the first prompt, the second prompt will appear after 30 minutes.
(3) Humidity detection
The humidity sensor detection is mainly used to detect the vehicle running on 9 rainy days in order to remind the driver who drives the vehicle in the rain to drive carefully. Humidity detection uses the simplest reed humidity sensor, see L2 in Figure 2. When there is no rain erosion. The reed sensor is separated by two reeds without any conductive medium in between, so that the sensor output is high; when rainwater is wetted to the two reeds of the sensor L2, the rain becomes a conductor to make the sensor 由于 because the two reeds are closely spaced. The output is low. Low level output of L2. Send it to U3 (23) for signal judgment.
When the U3 (23) pin detects a low level. The system will report "Rainy driving. Please pay attention to safety". If L2 is always low, it will be reported every 30 minutes. To remind the driver to pay attention to driving.
For reliable detection of rainy days. The L2 probe can be placed on the outside of the door. As long as there is rain falling over the sky, the sensor is sensitively detected.
(4) foggy day detection
When the vehicle is driving in foggy weather. The driver should be very careful. The sensor for detecting foggy days is a combination of a photosensitive detecting circuit and a humidity detecting circuit. Since the photosensitive detection circuit is very simple, this circuit is composed of R25 and VD3, and the principle will not be explained.
When the photoreceptor is deleted to the ambient brightness is low to a certain extent. In addition, if the fog crystallizes on the humidity sensor reed, the system considers it to be a foggy vehicle. When driving in foggy weather. Then there is "Fog driving, please pay attention to safety"
Voice prompts. The prompting method is that the previous prompt is separated from the next prompt by 30 minutes.
Although this method of detection is not very scientific, in order to save costs.
I have to use this "alternative" combination to identify. In the case of high requirements, a fog sensor can be used for detection and identification.
(5) Driving inspection at night
Due to the dim light at night, the nighttime driving can be detected by means of light detection. When driving at night. There are voice prompts for "Driving at night, please pay attention to safety", and the prompt interval is 30 minutes.
(6) Communication equipment open detection
The Traffic Law stipulates that it is not allowed to operate a vehicle with one hand, mainly for picking up/playing a mobile phone while the driver is driving. This type of communication device open (call) detection method, you can use the "call flash" sold in the market. Detect whether a high frequency transmission signal is present.
When the mobile communication device is in use, it will continuously send high-frequency signals to the contact station, that is, there will be strong high-frequency radiation, and the use of the commercially available "call flash" can detect the presence or absence of a call. The specific circuit is shown in Figure 2, L1, VD1, VD2 and other devices. If a signal is detected on the (5) foot of U3, there will be a voice prompt “Don't call the phone while driving.†However, if the vehicle is in a stopped state (but the key is plugged in) and a call comes in, there are three consecutive voice prompts "You have a call. Please press".
(7) Alcohol detection
The alcohol sensitive sensor can be used to detect air with a certain concentration of alcohol. For the circuit related to the saint detection, you can consult the relevant information. In order to save cost, this production uses a filament type sensor, and the circuit is shown in Fig. 2. If sensitivity is required, a semiconductor wine sensor can be used.
This prompter detects a certain amplitude signal on the U3 (3) foot. There is a voice prompt for "For your safety. Please do not drive" and prompt once every 5 minutes. For safety and reliability, users can also add a limited vehicle start function.
(8) Gated detection
Use the magnetic door control method. It can detect whether the door of the moving vehicle is closed. Since many vehicles are currently equipped with burglar alarms, signals can be extracted directly from the door detector detection signal line of the alarm. When the vehicle is started. If the door magnetic signal detects that the door is not closed, there is "the door is not closed. Please check"
Voice prompts. In order to be simple and easy to implement, the signals of the four doors adopt the form of “phase and phaseâ€, that is, it cannot be like some high-end cars, and the direct prompt is that a certain door is not beautiful. If the reminder is equipped with an alarm function, the door magnetic alarm principle can be utilized to make the reminder and alarm functions together. The voice prompt of "illegal driving the vehicle" can be added to the voice module, and the alarm is also used as an alarm.
2. Core Control Section
The vehicle driving safety reminder control core U3 uses the PIC16F73 chip. Because the program is simple and takes up less space, it can also be completed with 28-pin MCU such as PIC16C72/73 or PIC16F72. When using the program design and the corresponding port, it is necessary to set the R0 to RA3 (2) to (5) pins of the MCU to the analog input population. The other input interfaces can be set to the high and low level detection according to the above detection part. Since the reminder only has a voice prompt, the output directly controls the voice recording and playback module or the customized single-chip playback chip.
In addition, in this reminder, in addition to the external influence on the driver's normal driving factors, the driver's long-term fatigue reminder for continuous driving is also considered. When the driver starts driving the vehicle, the controller will start timing. If the driving lasts for more than 4 hours. There will be a voice prompt for "Too driving time is too long, please continue to drive after the break" every 10 minutes. If you continue driving for more than 10 minutes while driving, this reminder will be re-timed.
The single-chip program of this production is simple, and the reader only needs to directly refer to the 20D2 year-old "electronic newspaper" related PIC microcontroller example article. This control program can be easily programmed.
Third, other production
Because the reminder uses the single-chip microcomputer as the core to monitor and remind the driving condition in real time, it is convenient for the producer to improve the reminder and other functions by modifying the program, and can also use the old mobile phone to make a remote alarm. As follows: Use the door magnet to detect if the door is opened. Then, the single-chip microcomputer simulates the dialing button of the triggering mobile phone, and sequentially dials the pre-stored number. Since the dial-up device is set up by the phone itself. Therefore, the microcontroller only needs to simulate dialing. At the same time, since the mobile telecommunications operators have already opened a number of positioning services, they can also use program control to monitor the vehicle position.
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