CN207594870U - Intelligent HUD systems based on STM32 - Google Patents
Intelligent HUD systems based on STM32 Download PDFInfo
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Abstract
The utility model proposes a kind of intelligent HUD systems based on STM32, including：STM32 main control chips are connect by its FSMC interface with sram memory chip；STM32 main control chips are also connect by its FSMC interface with display screen, and display is shown under the control of STM32 main control chips；The audio input interface connection Audio Input Modules of bluetooth module；The audio output interface connection audio output module of bluetooth module；The transmitting-receiving terminal of bluetooth module is connect respectively by resistance with the first transmitting-receiving serial ports terminal of STM32 main control chips, to realize that the instruction of bluetooth module and STM32 main control chips, data communicate；OBD chips connect the OBD interfaces of vehicle, to obtain information of vehicles；The transmitting-receiving terminal of OBD chips is connect respectively by resistance with the second transmitting-receiving serial ports terminal of STM32 main control chips, and information of vehicles is transferred to STM32 main control chips.Cost can be substantially reduced, reduces design complexities, it is more efficient.
Description
Technical field
The utility model is related to automobile intelligent HUD (head up display) engineering device technique fields more particularly to a kind of bases
In the intelligent HUD systems of STM32.
Background technology
Automobile intelligent HUD is the nearly 2 years mobile units risen, currently on the market temporarily without mature and stable product, at present
Through existing intelligence HUD, there are subordinate's defects：Hardware system uses complicated controller, such as high pass, Lian Fake cpu chips,
Run the huge operating system such as Android, cost is very high, and stability is poor, and complete machine booting is slow, for some weights into
Originally, for the consumer of efficiency, HUD is simultaneously out of favour.
In addition, the current HUD that control is dominated by complex control device, periphery circuit design get up it is also complex, if
Standby integrated function is also more single.Ware circuit designs Primary Reference consumer level mobile electronic device, such as mobile phone, PAD
Deng being not suitable for vehicular applications occasion, if ware circuit is unsatisfactory for vehicle rule grade heatproof requirement (- 40 DEG C~+85 DEG C), especially
It is that HUD works long hours under conditions of sunlight, particularly summer temperature higher, even air-conditioning can not also improve temperature
Condition, therefore the existing equal non-refractories of intelligent HUD using this scheme or similar scheme in the market, during actual use,
The phenomenon that equipment occurs to crash under the high temperature conditions or constantly restart, and then equipment life can be shortened, seriously affect user experience.
Utility model content
The technical problem to be solved by the utility model is to provide a kind of intelligent HUD systems based on STM32, can drop significantly
Low cost reduces design complexities, more efficient.
To solve the above problems, the utility model proposes a kind of intelligent HUD systems based on STM32, including：OBD chips,
Master control system, display screen, bluetooth module, Audio Input Modules and audio output module；
The master control system includes STM32 main control chips and sram memory chip, and the STM32 main control chips pass through it
FSMC interfaces are connect with the sram memory chip；
The STM32 main control chips are also connect by FSMC interfaces its described with the display screen, and the display is in institute
It states and is shown under the control of STM32 main control chips；
The audio input interface of the bluetooth module connects the Audio Input Modules；The audio output of the bluetooth module
Interface connects the audio output module；The transmitting-receiving terminal of the bluetooth module passes through resistance and the STM32 master controls core respectively
First transmitting-receiving serial ports terminal connection of piece, to realize that the instruction of the bluetooth module and the STM32 main control chips, data are led to
Letter；
The OBD interfaces of the OBD chips connection vehicle, to obtain information of vehicles；The transmitting-receiving terminal difference of the OBD chips
It is connect, the information of vehicles is transferred to described with the second transmitting-receiving serial ports terminal of the STM32 main control chips by resistance
STM32 main control chips.
One embodiment according to the present utility model, the I/O port of the bluetooth module are connected with button of answering the call, hang up
Button, volume down button, volume increase button；The button of answering the call, button of hanging up, volume down button, volume increase button point
Do not connect the I/O port that voltage, the other end connect the bluetooth module by resistance at one end, wherein, the button of answering the call should
One end is also connected with the call detection terminal of the STM32 main control chips.
One embodiment according to the present utility model, the Audio Input Modules include：Left audio input circuit and the right side
Road audio input circuit；
The left audio input circuit includes：First microphone, the first inductance, the first capacitance, the second capacitance, third electricity
Appearance, the 4th capacitance, first resistor；The anode of first microphone connects the first end of first inductance, cathode ground connection；Institute
The one end for stating the first capacitance connects the second end of first inductance, second end ground connection；The first end connection of second capacitance
The second end of first inductance, second end connect the positive terminal in the first audio input interface of the bluetooth module；Institute
The first end for stating first resistor connects the second end of first inductance, and the first audio that second end connects the bluetooth module is defeated
Bias terminal in incoming interface；The first end of the third capacitance connects the second end of the first resistor, second end connection institute
State the negative terminal in the first audio input interface of bluetooth module；The first end of 4th capacitance connects the first resistor
Second end, second end ground connection；
The right wing audio input circuit includes：Second microphone, the second inductance, the 5th capacitance, the 6th capacitance, the 7th electricity
Appearance, the 8th capacitance, second resistance；The anode of the second microphone connects the first end of second inductance, cathode ground connection；Institute
The one end for stating the 5th capacitance connects the second end of second inductance, second end ground connection；The first end connection of 6th capacitance
The second end of second inductance, second end connect the positive terminal in the second audio input interface of the bluetooth module；Institute
The first end for stating second resistance connects the second end of second inductance, and the second audio that second end connects the bluetooth module is defeated
Bias terminal in incoming interface；The first end of 7th capacitance connects the second end of the second resistance, second end connection institute
State the negative terminal in the second audio input interface of bluetooth module；The first end of 8th capacitance connects the second resistance
Second end, second end ground connection.
One embodiment according to the present utility model, the audio output module include：Audio frequency power amplifier chip, first raises one's voice
Device and the second loud speaker；The two-way positive and negative anodes input terminal of the audio frequency power amplifier chip passes through bluetooth mould described in capacitance connection respectively
The first audio output interface and the second audio output interface of block；First loud speaker is connected to the audio frequency power amplifier chip
On first via leading-out terminal；Second loud speaker is connected on the second road leading-out terminal of the audio frequency power amplifier chip.
One embodiment according to the present utility model, further includes：FLASH chip；The FLASH chip passes through SPI interface
With the STM32 main control chips connection communication；Chip select terminal of the FLASH chip connects the piece of the STM32 main control chips
Select control terminal.
One embodiment according to the present utility model, further includes：LED backlight drive circuit；The LED backlight drive circuit
Including：Constant pressure driving chip, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, third inductance, first
Diode；
The input terminal of the constant pressure driving chip receives supply voltage；Described in the first end connection of the 3rd resistor
First pwm signal output terminal of STM32 main control chips, the second end of the 3rd resistor connect making for the constant pressure driving chip
It can end；The first end of 4th resistance connects the second end of the 3rd resistor, second end ground connection；The of 5th resistance
One end connects the feedback end of the constant pressure driving chip, and second end connects the LED backlight plate cathode of the display screen；Described 6th
The first end of resistance connects the second end of the 5th resistance, second end ground connection；Described in the first end connection of 7th resistance
The feedback end of constant pressure driving chip, second end connect the output detection terminal of the STM32 main control chips；The third inductance
First end connects the input terminal of the constant pressure driving chip, and second end connects the output terminal of the constant pressure driving chip；Described
The anode of one diode connects the second end of the third inductance, and cathode connects the LED backlight plate anode of the display screen.
One embodiment according to the present utility model, further includes speed regulation circuit for fan；The speed regulation circuit for fan includes：The
One NMOS tube, the 8th resistance, the 9th resistance and radiator fan；
The first end of 8th resistance connects the second pwm signal output terminal of the STM32 main control chips, and second end connects
Connect the grid of first NMOS tube；The first end of 9th resistance connects the second end of the 8th resistance, the second termination
Ground；The source electrode ground connection of first NMOS tube, drain electrode connect the radiator fan.
One embodiment according to the present utility model, further includes：Photosensitive circuit；The photosensitive circuit include photo resistance and
Divider resistance, the photo resistance and divider resistance are serially connected between supply voltage and ground terminal, the photo resistance and partial pressure electricity
The photosensitive detection terminal of the direct-connected STM32 main control chips of tie point of resistance.
One embodiment according to the present utility model, further includes：Temperature sensing circuit；The temperature sensing circuit includes：
Temperature sensor, model DS18B20；The temperature inspection of the direct-connected STM32 main control chips of output terminal of the temperature sensor
Terminal is surveyed, direct output temperature value gives the STM32 main control chips.
One embodiment according to the present utility model, further includes power module, connects the OBD interfaces, and by decompression
It powers after converting into the STM32 main control chips and its peripheral circuit.
After adopting the above technical scheme, the utility model has the advantages that compared with prior art：
Using STM32 controllers as main control chip, cost can be reduced, and periphery design is more simple, be connect by FSMC
Mouth communicates with STM32 main control chips and sram memory chip high speed, may be such that complete machine speed faster, more efficient；STM32 master control cores
Interface duplex can improve the utilization rate of interface between piece and sram memory chip, improve expandability；By audio input mould
Block and audio output module are connected to bluetooth module, and the audio of input and output is handled by bluetooth module, mitigate STM32
The processing load of main control chip can make it respond faster to other signals, and processing speed is faster；OBD chips pass through resistance
It is connect with the STM32 main control chips, signal interference can be prevented and realizes electrical level match；The peripheral hardware electricity of STM32 main control chips
Road type of attachment is simple, and substantially without interface modular converter is added, integrated circuit is succinct.
Description of the drawings
Fig. 1 is the structure diagram of the intelligent HUD systems based on STM32 of one embodiment of the utility model；
Fig. 2 is the schematic diagram of circuit connection structure of the bluetooth module of one embodiment of the utility model；
Fig. 3 is the schematic diagram of circuit connection structure of the OBD modules of one embodiment of the utility model；
Fig. 4 is the schematic diagram of circuit connection structure of the Audio Input Modules of one embodiment of the utility model；
Fig. 5 is the schematic diagram of circuit connection structure of the audio output module of one embodiment of the utility model；
Fig. 6 is the schematic diagram of circuit connection structure of the LED backlight drive circuit of one embodiment of the utility model；
Fig. 7 is the schematic diagram of circuit connection structure of the speed regulation circuit for fan of one embodiment of the utility model.
Specific embodiment
Above-mentioned purpose, feature and advantage to enable the utility model are more obvious understandable, below in conjunction with the accompanying drawings to this
The specific embodiment of utility model is described in detail.
Many details are elaborated in the following description in order to fully understand the utility model.But this practicality is new
Type can be much to implement different from other manner described here, and those skilled in the art can be new without prejudice to this practicality
Similar popularization is done in the case of type intension, therefore the utility model is not limited by following public specific implementation.
Referring to Fig. 1, in one embodiment, the intelligent HUD systems based on STM32, including：OBD (mounted automatic diagnosis systems
System) chip 7, master control system, display screen 3, bluetooth module 4, Audio Input Modules 5 and audio output module 6.
Master control system includes STM32 main control chips 1 and sram memory chip 2, and the STM32 main control chips 1 pass through it
FSMC (Flexible Static Memory Controller, variable static storage controller) interfaces and the sram memory
Chip 2 connects.It is connected between STM32 main control chips 1 and sram memory chip 2 by FSMC interfaces, can realize high-speed communication.
Microcontroller series of the STM32 as a mainstream, meets industry, medical treatment and the various applications of consumer electronics market
Demand for example selects the F1 family chips of STM32 to meet vehicle-mounted operating condition as main control chip in the utility model embodiment
Demand.1M sizes for example may be used in sram memory chip 2, and model IS62WV51216BLL meets application demand.
STM32 main control chips 1 are also connect by FSMC interfaces its described with the display screen 3, and the display screen 3 is described
It is shown under the control of STM32 main control chips 1.Display screen 3 and sram memory chip 2 are all connected to FSMC interfaces, and realizing should
The multiplexing of FSMC interfaces.Certainly, FSMC interfaces can have a more terminal, and what display screen 3 and sram memory chip 2 were multiplexed can be with
It is part terminal therein.
The audio input interface of bluetooth module 4 connects the Audio Input Modules 5；The audio output of the bluetooth module 4
Interface connects the audio output module 6.
The transmitting-receiving terminal of bluetooth module 4 passes through resistance and the first transmitting-receiving serial ports terminal of the STM32 main control chips respectively
Connection, to realize that the instruction of the bluetooth module and the STM32 main control chips, data communicate.Referring to Fig. 2, by the bluetooth of Fig. 1
Module 1 is labeled as U10, versions BT4.0, such as selects CSR8670 modules, while supports and Android and apple hand
Audio and the data communication of machine, wherein passing through BLE with iPhone into row data communication by spp agreements with Android phone
Agreement is into row data communication.Bluetooth module U10 receives and dispatches serial ports terminal by the first of serial ports TX, RX and STM32 main control chip
USART1_TX, USART1_RX are connected, and are realized instruction and data communication, are serially connected with resistance R66 and R67 therebetween.
Referring to Fig. 3, by the OBD chips 7 of Fig. 1 labeled as U7, the OBD interfaces 9 of Fig. 1 are connected labeled as USB, OBD chips U7
The OBD interface USB picked up, to obtain information of vehicles.OBD chips U7 connects OBD by the wiring of car OBD interface standard and connects
Mouth USB, J1850+, J1850- a pair of J lines, K_LINE, L_LINE are a pair of of K lines, and CAN_H, CAN_L are a pair of of can buses, are passed
Defeated digital signal, such as the critical datas such as rotating speed, oil consumption；The 1 foot detection battery voltage of OBD chips U7,12 feet connection voltage
ACC detection terminals, the transmission ACC signals of VCC50,11 feet connection STM32.
The transmitting-receiving terminal of OBD chips U7 passes through resistance and the second transmitting-receiving serial ports terminal of the STM32 main control chips 1 respectively
USART2_TX, USART2_RX are connected, and the information of vehicles is transferred to the STM32 main control chips 1.In Fig. 3, OBD cores
Piece U7 is communicated by 7,8 serial ports pins with STM32 main control chips 1, is received STM32 main control chips 1 and is instructed, returns data to
STM32 main control chips；The resistance of resistance R40, R41 optional 100 ohm or other resistance values (needing to test feasibility), for preventing
Stop signal interferes and realizes electrical level match.
Using STM32 controllers as main control chip, cost can be reduced, and periphery design is more simple, be connect by FSMC
Mouth and 2 high-speed communication of STM32 main control chips 1 and sram memory chip, may be such that complete machine speed faster, more efficient；STM32 master controls
Interface duplex can improve the utilization rate of interface between chip 1 and sram memory chip 2, improve expandability；Audio is defeated
Enter module and audio output module is connected to bluetooth module, the audio of input and output is handled by bluetooth module, mitigate
The processing load of STM32 main control chips 1 can make it respond faster to other signals, and processing speed is faster；OBD chips lead to
It crosses resistance to connect with the STM32 main control chips 1, signal interference can be prevented and realizes electrical level match；STM32 main control chips 1
Peripheral circuit type of attachment it is simple, substantially without interface modular converter is added, integrated circuit is succinct.
In one embodiment, with continued reference to Fig. 2, the I/O port of bluetooth module U10 is connected with the button CALL that answers the call, hangs electricity
Talk about button HANG, volume down button VOL-, volume and increase button VOL+, each serve as answer the call, hang up by control, volume reduction, increasing
The effect of volume.
Answer the call button CALL one end by 30 foot of I/O port of resistance R74 connection bluetooth modules U10, the other end passes through electricity
Resistance connects voltage ZVCC3.3V and passes through capacitance C13 and is grounded.Wherein, the one end of the button CALL that answers the call is also connected with described
The call detection terminal of STM32 main control chips so that whether STM32 main control chips can detect bluetooth module U10 in call shape
State.Button HANG, volume down button VOL-, the volume of hanging up increase button VOL+ and connect voltage 1.8V, the other end at one end respectively
31 foot of I/O port, 24 feet, 25 feet of the bluetooth module U10 are connected by resistance.
Preferably, referring to Fig. 4, Audio Input Modules 5 include：Left audio input circuit and right wing audio input circuit,
It is connected to 51~56 pins of bluetooth module U10, the input as sound such as speech recognition, bluetooth telephones.
Left audio input circuit includes：First microphone MIC1, the first inductance L8, the first capacitance C61, the second capacitance
C60, third capacitance C59, the 4th capacitance C58, first resistor R62；The anode connection described first of the first microphone MIC1
The first end of inductance L8, the cathode ground connection GND of the first microphone MIC1；One end connection described first of the first capacitance C61
The second end of inductance L8, the second end ground connection GND of the first capacitance C61；The first end connection described first of the second capacitance C60
The second end of inductance L8, the second end of the second capacitance C60 are connected in the first audio input interface of the bluetooth module U10 just
Extremely sub- MIC_LP；The first end of the first resistor R62 connects the second end of the first inductance L8, first resistor R62's
Second end connects the bias terminal MIC_BIAS_L in the first audio input interface of the bluetooth module U10；The third electricity
The first end for holding C59 connects the second end of the first resistor R62, and the second end of third capacitance C59 connects the bluetooth module
Negative terminal MIC_LN in the first audio input interface of U10；First end connection first electricity of the 4th capacitance C58
Hinder the second end of R62, the second end ground connection of the 4th capacitance C58.
The right wing audio input circuit includes：Second microphone MIC2, the second inductance L9, the 5th capacitance C65, the 6th electricity
Hold C63, the 7th capacitance C64, the 8th capacitance C62, second resistance R73；The anode connection described the of the second microphone MIC2
The first end of two inductance L9, the cathode ground connection GND of second microphone MIC2；One end connection described the of the 5th capacitance C65
The second end of two inductance L9, the second end ground connection GND of the 5th capacitance C65；The first end connection described the of the 6th capacitance C63
The second end of two inductance L9, the second end of the 6th capacitance C63 are connected in the second audio input interface of the bluetooth module U10
Positive terminal MIC_RP；The first end of the second resistance R73 connects the second end of the second inductance L9, second resistance R73
Second end connect bias terminal MIC_BIAS_R in the second audio input interface of the bluetooth module U10；Described 7th
The first end of capacitance C64 connects the second end of the second resistance R73, and the second end of the 7th capacitance C64 connects the bluetooth mould
Negative terminal MIC_RN in the second audio input interface of block U10；The first end connection described second of the 8th capacitance C62
The second end of resistance R73, the second end ground connection of the 8th capacitance C62.
Left audio input circuit and right wing audio input circuit realize diamylose phonetic entry, the three-dimensional sense of the audio of diamylose
More preferably, noise reduction is more preferable, and final audio is experienced.
Preferably, referring to Fig. 5, audio output module 6 includes：Audio frequency power amplifier chip U9, the first loud speaker SPEAKL and
Two loud speaker SPEAKR；Positive and negative anodes input terminal SPKR_LP, SPKR_LN of the audio frequency power amplifier chip U9 passes through capacitance respectively
C48, C50 connect 58 foot of the first audio output interface, 59 feet of the bluetooth module U10, the sound letter from bluetooth module U10
It number is exported after power amplifier is handled to the first loud speaker SPEAKL；The positive and negative anodes input terminal SPKR_RP of audio frequency power amplifier chip U9,
SPKR_RN connects 60 foot of the second audio output interface, 61 feet of the bluetooth module U10 by capacitance C49, C51 respectively；It is described
First loud speaker SPEAKL is connected to 5 foot of first via leading-out terminal of the audio frequency power amplifier chip U9, on 8 feet；Described second raises
Sound device SPAELR is connected to 13 foot of the second road leading-out terminal of the audio frequency power amplifier chip U9, on 16 feet.
Audio output is set as twin loudspeaker, and wide frequency range, sound quality is more better, the bigger that volume can be done in addition.This
Outside, whether 10,11 pins of audio frequency power amplifier chip U9 connect the P1O7 pins of bluetooth module, output can be controlled quiet by the pin
Sound, audio output is normal if high level is exported, otherwise output mute.
In one embodiment, the intelligent HUD systems based on STM32 can also include：FLASH chip (is not shown in figure
Go out).The FLASH chip passes through SPI interface and 1 connection communication of STM32 main control chips；The piece choosing of the FLASH chip
The piece that terminal connects the STM32 main control chips 1 selects control terminal.
FLASH chip for example using model W25Q64, is communicated by SPI interface and STM32 main control chips 1, and No. 1 is drawn
Foot is chip selection signal, and STM32 main control chips 1 can select FLASH chip by dragging down the pin, and 2, No. 5 pins are SPI communication
Data pin, No. 6 pins provide clock signal for SPI communication.
FLASH chip is mainly used for the firmware and alternative document of deposit system；Wherein system firmware includes being currently running
Firmware and online upgrading after the firmware downloaded, if upgraded successfully, restarting equipment can delete the firmware after downloading, to save
Space；Alternative document includes relevant journal file, picture file, the font file at UI interfaces etc..
In one embodiment, referring to Fig. 6, the intelligent HUD systems based on STM32 can also include：LED backlight driving electricity
Road.The LED backlight drive circuit includes：Constant pressure driving chip U11,3rd resistor R14, the 4th resistance R18, the 5th resistance
R15, the 6th resistance R10, the 7th resistance R22, third inductance L3, the first diode D2.
The input terminal of the constant pressure driving chip U11 receives supply voltage VCC-12V；The first of the 3rd resistor R14
End is connected described in the second end connection of the first pwm signal output terminal EN, the 3rd resistor R14 of the STM32 main control chips 1
The Enable Pin of constant pressure driving chip U11；The first end of the 4th resistance R18 connects the second end of the 3rd resistor R14, the
The second end ground connection GND of four resistance R18；The first end of the 5th resistance R15 connects the feedback of the constant pressure driving chip U11
End, the second end of the 5th resistance R15 connect the LED backlight plate cathode LED- of the display screen；The first of the 6th resistance R19
End connects the second end of the 5th resistance R15, the second end ground connection GND of the 6th resistance R19；The of the 7th resistance R22
One end connects the feedback end of the constant pressure driving chip U11, and the second end of the 7th resistance R22 connects the STM32 main control chips 1
Output detection terminal DACOUT；The first end of the third inductance L3 connects the input terminal of the constant pressure driving chip U11, the
The second end of three inductance L3 connects the output terminal of the constant pressure driving chip U11；The anode connection institute of the first diode D2
The second end of third inductance L3 is stated, the cathode of the first diode D2 connects the LED backlight plate anode LED+ of the display screen.When
So, capacitance C22, C26, C24 etc. can also be set to be filtered voltage.First diode D2 is to prevent output from pouring in down a chimney to the
Three this one end of inductance L3 can only have this end of third inductance L3 to LED backlight plate anode LED+, accumulation of energy and induced electricity using inductance
Kinetic potential is boosted.
By changing the 6th resistance R19, thus it is possible to vary the driving current of output；STM32 main control chips are detected by exporting
The feedback voltage of No. 3 pins of terminal DACOUT acquisition constant pressure driving chips U11, so as to detect and control constant pressure driving chip
The working condition of U11.Constant pressure driving chip U11 for example selects constant pressure driving chip SXI308.
Backlight drive selects constant-pressure type, at low cost using simple；STM32 main control chips 1 control the output of the first pwm signal
The PWM wave of EN output certain frequencies and duty ratio is held, the average output power of constant pressure driving chip U11 can be controlled, so as to control
The brightness of backlight processed；When the system hibernates, the first pwm signal output terminal EN output levels can cease screen, reduce power consumption.
In one embodiment, the intelligent HUD systems based on STM32 can also include speed regulation circuit for fan；The fan
Alignment circuit includes：First NMOS tube Q1, the 8th resistance R16, the 9th resistance R17 and radiator fan U12.
The first end of the 8th resistance R16 connects the second pwm signal output terminal PWM4_ of the STM32 main control chips 1
The second end of OUT, the 8th resistance R16 connect the grid of the first NMOS tube Q1；The first end connection of the 9th resistance R17
The second end of the 8th resistance R16, the second end ground connection GND of the 9th resistance R17；The source electrode ground connection of the first NMOS tube Q1
The drain electrode of GND, the first NMOS tube Q1 connect the radiator fan U12.Radiator fan U12 is PWM speed-regulating fans, in addition two terminations
Power supply VCC50 and ground GND, completes to adjust by the pwm signal duty ratio for changing the second pwm signal output terminal PWM4_OUT outputs
Speed.Radiator fan U12 can radiate to LED backlight plate, when power output is higher, can drive radiator fan U12's
Rotating speed is more quicker, otherwise slower driving, and realizes the adjusting of heat dissipation.
In one embodiment, the intelligent HUD systems based on STM32 can also include：Photosensitive circuit.The photosensitive circuit
Including photo resistance and divider resistance, the photo resistance and divider resistance are serially connected between supply voltage and ground terminal, the light
The photosensitive detection terminal of the direct-connected STM32 main control chips of the tie point of quick resistance and divider resistance.
Photo resistance is selected to detect light luminance, model is, for example, GL5516A, when ambient light changes, photosensitive electricity
The resistance value of resistance can change；The voltage of the tie point of photo resistance and divider resistance output can also generate variation, STM32 master controls
Chip, with reference to the resistance value of divider resistance, can be obtained by reading the voltage value of the tie point of photo resistance and divider resistance
The resistance value of photo resistance further according to photo resistance and the relation curve of light intensity, can determine the bright of ambient light
Degree.By the detection of ambient brightness, the PWM drive signal of LED backlight drive circuit can be adjusted so that when brightness is higher
It is on the contrary then dim so that LED backlight plate lightens so that display screen is unlikely to not seeing when ambient light is brighter, and in ambient light
It is unlikely to too dazzling when dark.
In one embodiment, the intelligent HUD systems based on STM32 can also include：Temperature sensing circuit.The temperature
Detection circuit includes：Temperature sensor, model DS18B20；The direct-connected STM32 master controls of output terminal of the temperature sensor
The temperature detection terminal of chip, direct output temperature value give the STM32 main control chips.By the detection of temperature, can adjust
The PWM drive signal of radiator fan and the PWM drive signal of LED backlight drive circuit are controlled, in overheat, can will be radiated
The speed of fan tunes up and turns down the output power of LED backlight drive circuit, can reduce the temperature of complete machine, conversely, then
The speed of radiator fan can be slowed down and the output power of LED backlight drive circuit is turned up, with minimum power consumption adjust to
Optimal display brightness.
In one embodiment, with continued reference to Fig. 1, the intelligent HUD systems based on STM32 can also include power module 8.
Power module 8 connects OBD interfaces 9, can obtain battery voltage 12V, and into the STM32 main control chips after decompression is converted
1 and its peripheral circuit power supply.It can be realized by two pieces of power conversion chips, such as selection model MP2359.System is total
Power supply is inputted by car OBD interface, input voltage 12V or so, beyond the operating voltage range of main control chip and peripheral circuit,
It needs to be depressured by DC-DC and convert, a voltage of output is 3.3V voltages, is STM32 main control chips 1, FLASH chip, indigo plant
4 grade of tooth module is powered, another voltage of output is 5V, is the power supplies such as radiator fan.
Although the utility model is disclosed as above with preferred embodiment, it is not for limiting claim, Ren Heben
Field technology personnel without departing from the spirit and scope of the utility model, can make possible variation and modification, therefore
The scope of protection of the utility model should be subject to the range that the utility model claims are defined.
Claims (10)
1. a kind of intelligent HUD systems based on STM32, which is characterized in that including：OBD chips, master control system, display screen, bluetooth
Module, Audio Input Modules and audio output module；
The master control system includes STM32 main control chips and sram memory chip, and the STM32 main control chips are connect by its FSMC
Mouth is connect with the sram memory chip；
The STM32 main control chips are also connect by FSMC interfaces its described with the display screen, and the display screen is described
It is shown under the control of STM32 main control chips；
The audio input interface of the bluetooth module connects the Audio Input Modules；The audio output interface of the bluetooth module
Connect the audio output module；The transmitting-receiving terminal of the bluetooth module passes through resistance and the STM32 main control chips respectively
First transmitting-receiving serial ports terminal connection, to realize that the instruction of the bluetooth module and the STM32 main control chips, data communicate；
The OBD interfaces of the OBD chips connection vehicle, to obtain information of vehicles；The transmitting-receiving terminal of the OBD chips passes through respectively
Resistance is connect with the second transmitting-receiving serial ports terminal of the STM32 main control chips, and the information of vehicles is transferred to the STM32
Main control chip.
2. the intelligent HUD systems based on STM32 as described in claim 1, which is characterized in that the I/O port of the bluetooth module connects
It is connected to button of answering the call, button of hanging up, volume down button, volume and increases button；The button of answering the call, button of hanging up, sound
Amount subtracts button, volume increases button and connects the I/O port that voltage, the other end connect the bluetooth module by resistance at one end respectively,
In, the one end of the button of answering the call is also connected with the call detection terminal of the STM32 main control chips.
3. the intelligent HUD systems based on STM32 as described in claim 1, which is characterized in that the Audio Input Modules packet
It includes：Left audio input circuit and right wing audio input circuit；
The left audio input circuit includes：First microphone, the first inductance, the first capacitance, the second capacitance, third capacitance,
4th capacitance, first resistor；The anode of first microphone connects the first end of first inductance, cathode ground connection；It is described
One end of first capacitance connects the second end of first inductance, second end ground connection；The first end connection institute of second capacitance
The second end of the first inductance is stated, second end connects the positive terminal in the first audio input interface of the bluetooth module；It is described
The first end of first resistor connects the second end of first inductance, and second end connects the first audio input of the bluetooth module
Bias terminal in interface；The first end of the third capacitance connects the second end of the first resistor, described in second end connection
Negative terminal in first audio input interface of bluetooth module；The first end of 4th capacitance connects the first resistor
Second end, second end ground connection；
The right wing audio input circuit includes：Second microphone, the second inductance, the 5th capacitance, the 6th capacitance, the 7th capacitance,
8th capacitance, second resistance；The anode of the second microphone connects the first end of second inductance, cathode ground connection；It is described
One end of 5th capacitance connects the second end of second inductance, second end ground connection；The first end connection institute of 6th capacitance
The second end of the second inductance is stated, second end connects the positive terminal in the second audio input interface of the bluetooth module；It is described
The first end of second resistance connects the second end of second inductance, and second end connects the second audio input of the bluetooth module
Bias terminal in interface；The first end of 7th capacitance connects the second end of the second resistance, described in second end connection
Negative terminal in second audio input interface of bluetooth module；The first end of 8th capacitance connects the second resistance
Second end, second end ground connection.
4. the intelligent HUD systems based on STM32 as described in claim 1, which is characterized in that the audio output module packet
It includes：Audio frequency power amplifier chip, the first loud speaker and the second loud speaker；The two-way positive and negative anodes input terminal point of the audio frequency power amplifier chip
Do not pass through the first audio output interface of bluetooth module described in capacitance connection and the second audio output interface；First loud speaker
It is connected on the first via leading-out terminal of the audio frequency power amplifier chip；Second loud speaker is connected to the audio frequency power amplifier chip
The second road leading-out terminal on.
5. the intelligent HUD systems based on STM32 as described in any one in claim 1-4, which is characterized in that further include：
FLASH chip；The FLASH chip passes through SPI interface and the STM32 main control chips connection communication；The FLASH chip
The piece that chip select terminal connects the STM32 main control chips selects control terminal.
6. the intelligent HUD systems based on STM32 as described in any one in claim 1-4, which is characterized in that further include：
LED backlight drive circuit；The LED backlight drive circuit includes：Constant pressure driving chip, 3rd resistor, the 4th resistance, the 5th electricity
Resistance, the 6th resistance, the 7th resistance, third inductance, the first diode；
The input terminal of the constant pressure driving chip receives supply voltage；The first end of the 3rd resistor connects the STM32 master
The first pwm signal output terminal of chip is controlled, the second end of the 3rd resistor connects the Enable Pin of the constant pressure driving chip；Institute
The first end for stating the 4th resistance connects the second end of the 3rd resistor, second end ground connection；The first end of 5th resistance connects
The feedback end of the constant pressure driving chip is connect, second end connects the LED backlight plate cathode of the display screen；6th resistance
First end connects the second end of the 5th resistance, second end ground connection；The first end of 7th resistance connects the constant pressure and drives
The feedback end of dynamic chip, second end connect the output detection terminal of the STM32 main control chips；The first end of the third inductance
The input terminal of the constant pressure driving chip is connected, second end connects the output terminal of the constant pressure driving chip；One or two pole
The anode of pipe connects the second end of the third inductance, and cathode connects the LED backlight plate anode of the display screen.
7. the intelligent HUD systems based on STM32 as claimed in claim 6, which is characterized in that further include speed regulation circuit for fan；
The speed regulation circuit for fan includes：First NMOS tube, the 8th resistance, the 9th resistance and radiator fan；
The first end of 8th resistance connects the second pwm signal output terminal of the STM32 main control chips, second end connection institute
State the grid of the first NMOS tube；The first end of 9th resistance connects the second end of the 8th resistance, second end ground connection；Institute
The source electrode ground connection of the first NMOS tube is stated, drain electrode connects the radiator fan.
8. the intelligent HUD systems based on STM32 as claimed in claim 7, which is characterized in that further include：Photosensitive circuit；It is described
Photosensitive circuit includes photo resistance and divider resistance, the photo resistance and divider resistance be serially connected in supply voltage and ground terminal it
Between, the photosensitive detection terminal of the direct-connected STM32 main control chips of tie point of the photo resistance and divider resistance.
9. the intelligent HUD systems based on STM32 as claimed in claim 7, which is characterized in that further include：Temperature sensing circuit；
The temperature sensing circuit includes：Temperature sensor, model DS18B20；The output terminal of the temperature sensor is direct-connected described
The temperature detection terminal of STM32 main control chips, direct output temperature value give the STM32 main control chips.
10. the intelligent HUD systems based on STM32 as described in any one in claim 1-4, which is characterized in that further include
Power module connects the OBD interfaces, and powers after decompression is converted into the STM32 main control chips and its peripheral circuit.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110027410A (en) * | 2019-04-16 | 2019-07-19 | 深圳市尼欧科技有限公司 | The display methods and device of the vehicle-mounted display that comes back |
| CN111263343A (en) * | 2020-03-06 | 2020-06-09 | 苏州车萝卜汽车电子科技有限公司 | Bluetooth-based multi-terminal audio interaction system suitable for HUD |
| CN113064733A (en) * | 2020-07-23 | 2021-07-02 | 浙江华云信息科技有限公司 | LINUX message queue-based multi-application shared serial port communication method |
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2017
- 2017-11-17 CN CN201721539771.3U patent/CN207594870U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110027410A (en) * | 2019-04-16 | 2019-07-19 | 深圳市尼欧科技有限公司 | The display methods and device of the vehicle-mounted display that comes back |
| CN110027410B (en) * | 2019-04-16 | 2021-06-01 | 深圳市尼欧科技有限公司 | Display method and device of vehicle-mounted head-up display |
| CN111263343A (en) * | 2020-03-06 | 2020-06-09 | 苏州车萝卜汽车电子科技有限公司 | Bluetooth-based multi-terminal audio interaction system suitable for HUD |
| CN111263343B (en) * | 2020-03-06 | 2024-05-03 | 北京乐驾科技有限公司 | Multi-terminal audio interactive system suitable for HUD and based on Bluetooth |
| CN113064733A (en) * | 2020-07-23 | 2021-07-02 | 浙江华云信息科技有限公司 | LINUX message queue-based multi-application shared serial port communication method |
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