CN113312291B - Golf radar sensor mainboard circuit - Google Patents
Golf radar sensor mainboard circuit Download PDFInfo
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- CN113312291B CN113312291B CN202110627705.6A CN202110627705A CN113312291B CN 113312291 B CN113312291 B CN 113312291B CN 202110627705 A CN202110627705 A CN 202110627705A CN 113312291 B CN113312291 B CN 113312291B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/382—Information transfer, e.g. on bus using universal interface adapter
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
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- Computer Networks & Wireless Communication (AREA)
- Theoretical Computer Science (AREA)
- Electromagnetism (AREA)
- General Engineering & Computer Science (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention belongs to the technical field of radar sensors, and particularly relates to a golf radar sensor mainboard circuit. The circuit of the invention comprises: the system comprises a lithium battery charging and discharging state indicator lamp control circuit, a lithium battery charging circuit, a one-key starting control circuit, a one-key shutdown circuit, a lithium battery boosting circuit, a lithium battery electric quantity monitoring circuit, an AD conversion circuit reference voltage circuit, a radar sensor power isolation circuit, a CPU control circuit, a digital ground analog ground common circuit and a Bluetooth module circuit; wherein: the output end of the lithium battery booster circuit is connected with the input ends of the AD conversion circuit reference voltage circuit, the radar sensor power supply isolation circuit and the CPU power supply isolation circuit 9, and the output end of the lithium battery charging circuit is connected with the one-key starting control circuit. The invention adopts a DCDC power isolation mode, and solves the problem of power supply influence on a radar sensor signal processing and measuring circuit in the working process of the Bluetooth module.
Description
Technical Field
The invention belongs to the technical field of radar sensors, and particularly relates to a golf radar sensor mainboard circuit.
Background
Golf is becoming increasingly popular worldwide as a sport that is both recreational and fitness outdoors. Through continuous field practice, the prediction capability of the motion trail of the golf ball under different field conditions, particularly the flight drop point and the rolling end point is improved, so that the hitting control capability and accuracy of the golf ball are enhanced, and the golf ball is always a target sought by amateur golfers or even professional players.
However, it is difficult to completely collect the data of the golf game process: the complexity of the motion mechanics of a golf ball is very large, the on-site meteorological conditions of the two golf balls and the instantaneous change of the golf ball in the flying process, the turf and ground conditions of the three golf balls and the local influence of the three conditions on the rolling process of the golf ball, the skill level of the four golfers and the like, and due to the comprehensive influence of the variable factors, the data acquisition and measurement in the golf ball process and the analysis and prediction of the subsequent motion trajectory are always very difficult, so that how to objectively obtain the real data of the motion trajectory and the dynamic characteristics of the golf ball becomes necessary for completing the objective analysis of the influence of various environmental factors and the consequences in the golf ball motion process. As an important means for truly tracking the moving track of the golf ball and sensing the dynamic characteristics, how to rely on the motion sensing and monitoring means installed on the golf ball itself becomes one of the most effective methods.
Disclosure of Invention
The invention aims to provide a golf radar sensor mainboard circuit capable of accurately acquiring and calculating the motion state of a golf in real time.
The golf radar sensor mainboard circuit provided by the invention adopts a CPU of an ARM Corte _ M4 kernel to communicate with a radar special processor to obtain a golf radar measurement original signal, so that the golf ball speed, the vertical take-off angle, the golf ball flight landing point distance and the total flight distance are calculated, and measurement data are wirelessly sent to a mobile phone APP through Bluetooth.
The main board circuit of the golf radar sensor provided by the invention is shown in figure 1; the method comprises the following steps: the system comprises a lithium battery charging and discharging state indicator lamp control circuit 1, a lithium battery charging circuit 2, a one-key startup control circuit 3, a one-key shutdown circuit 4, a lithium battery booster circuit 5, a lithium battery electric quantity monitoring circuit 6, an AD conversion circuit reference voltage circuit 7, a radar sensor power isolation circuit 8, a CPU power isolation circuit 9, a CPU control circuit 10, a digital ground analog ground common ground circuit 11 and a Bluetooth module circuit 12; wherein: the output end of the lithium battery booster circuit 5 is connected with the input ends of the AD conversion circuit reference voltage circuit 7, the radar sensor power supply isolation circuit 8 and the CPU power supply isolation circuit 9, and the output end of the lithium battery charging circuit 2 is connected with the one-key starting control circuit 3. Wherein:
the lithium battery charging and discharging state indicator lamp control circuit 1 is a system battery state prompt circuit, and the state of a system power supply directly influences the stability of the whole system due to the fact that a high-precision analog circuit and a high-speed acquisition system are involved. In practical application, the whole power supply voltage of the lithium battery can meet the normal application requirement of a system when the whole power supply voltage is between 3.5V and 4.2V, the power supply state indicator light prompts green at the moment, once the battery voltage is continuously detected to be lower than 3.5V, the power supply state indicator light prompts red, the equipment is charged at the moment, and otherwise, the accuracy of a measurement result is directly influenced.
The lithium battery charging circuit 2 is mainly used for charging a lithium battery, the state condition of the battery is automatically managed by a charging management IC in the charging process, and a green indicator lamp is lightened by the output information of the charging management IC after the battery is fully charged to prompt that the charging is finished.
The one-key startup control circuit 3 and the one-key shutdown control circuit 4 are used in a matched mode and are mainly used for system startup.
The one-key power-off control circuit 4 is matched with the one-key power-on control circuit 3 for use, and is mainly used for system power-off, when the power-on key is pressed manually and kept for more than 3 seconds, the CPU continuously detects that the key is pressed, the CPU controls all the indicator lamps to be turned off at the moment to prompt that the system software is powered off, and the key system is released to disconnect the power supply from the hardware at the moment, so that the power-off operation is completed on the hardware and the software.
The lithium battery booster circuit 5 mainly boosts the voltage of the lithium battery from 3.7-4.2V to 5V, provides input power supplies of a subsequent AD conversion circuit reference voltage circuit 7, a radar sensor power supply isolation circuit 8 and a CPU power supply isolation circuit 9, and provides proper power supply input for a core function module.
The lithium battery electric quantity monitoring circuit 6 is mainly used for detecting the voltage state of the lithium battery in real time and judging whether the state of the lithium battery meets the power supply input requirement of the system.
The reference voltage circuit 7 of the AD conversion circuit mainly provides a stable reference power supply for the AD acquisition functional unit of the system, otherwise inaccurate battery voltage acquisition is easily caused, and thus the working state judgment of the system is wrong, and the working reliability of the system is influenced.
The radar sensor power supply isolation circuit 8 mainly provides an independent, stable and reliable power supply system for the radar sensor, the radar sensor part is an analog working system, other functional parts are digital working systems, and the isolation power supply system is adopted to ensure the working stability of the radar sensor.
The CPU power isolation circuit 9 mainly provides power for the CPU and other digital working systems, completes system isolation from the analog part of the radar sensor in design, and enhances the working stability of the system.
The CPU control circuit 10 is a core processing and control unit and is used for completing battery power AD acquisition, conventional IO port output control, communication with a radar sensor, communication with a wireless Bluetooth module and the like.
The digital-to-analog-ground common ground circuit 11 completes one point common ground of the system.
The bluetooth module circuit 12 is mainly a wireless communication interface, the CPU sends out processed data results in a bluetooth wireless manner, and the mobile phone APP receives data through bluetooth to complete data transmission of the system.
In the present invention, the lithium battery charge/discharge state indicator lamp control circuit 1 includes: the LED lamp comprises a charging current-limiting resistor R1, indicator lamp power selection diodes D1 and D2, indicator lamp current-limiting resistors R2 and R3, a charging red indicator lamp DL1, a full green indicator lamp DL2, and indicator lamp control logic selection diodes D3 and D4. One end of a current limiting resistor R1 is directly connected to a USB interface power supply terminal, the other end is connected to indicator lamps DL1 and DL2 through a diode D1 to provide power for the indicator lamps DL1 and DL2, the other ends of the indicator lamps DL1 and DL2 are respectively connected to indicator lamp current limiting resistors R2 and R3, the other end of the current limiting resistor R2 is connected to a charging indication pin of a charging management chip IC1 and is connected to an IO0 port of a CPU through a diode D3 when passing through the charging management chip IC1, and the other end of the current limiting resistor R3 is connected to an IO1 port of the CPU through a diode D4 when passing through the charging management chip IC 1.
In the present invention, the lithium battery charging circuit 2 includes: the intelligent charging system comprises a USB charging interface U1, a charging current-limiting resistor R1, indicator lamp power selection diodes D1 and D2, indicator lamp current-limiting resistors R2 and R3, a charging red indicator lamp DL1, a fully charged green indicator lamp DL2, indicator lamp control logic selection diodes D3 and D4, a lithium battery charging management chip IC1 and a charging current-limiting setting resistor R4; one end of a current limiting resistor R1 is directly connected to a USB interface power supply terminal, the other end is connected to indicator lamps DL1 and DL2 through a diode D1, power sources of the indicator lamps DL1 and DL2 are provided, the other ends of the indicator lamps DL1 and DL2 are respectively connected to indicator lamp current limiting resistors R2 and R3, the other end of the current limiting resistor R2 is connected to a charging indication pin of a charging management chip IC1, the current limiting resistor R3 is connected to an IO0 port of a CPU, the other end of the current limiting resistor R3 is connected to a full indication pin of the charging management chip IC1, the current limiting resistor R4 is connected to an IO1 port of the CPU through a diode D4, and the charging current limiting setting resistor R4 is connected to a charging current setting pin of a charging management IC 1. Wherein: after the USB charging wire is connected to the U1 port, the circuit automatically switches the indicator light control authority and is controlled by the lithium battery charging management chip IC 1.
In the present invention, the one-touch power-on control circuit 3 includes: pull-up resistor R5, PMOS tube PQ1, key S1, isolation diode D5 and CPU control IO port IO 2; the pull-up resistor R5 is connected to one end of the key S1, and the other end of the key S1 is directly connected to the negative pole of the battery; meanwhile, the S pole of the PMOS pipe PQ1 is directly connected to the positive power supply, the G pole is connected to the control IO2 port of the CPU after being connected to the diode D5, and is also connected to the pull-up resistor R5, and the D pole is directly used as the power supply output. Wherein: after the key S1 is pressed, the system power is conducted from hardware, once the CPU is started, the CPU immediately sends low level through an IO2 port to take over the power control system, and the one-key starting function is completed.
In the present invention, the one-touch power-off control circuit 4 includes: pull-up resistor R15, isolation diode D6, key S1, and CPU control IO port IO 3. The pull-up resistor R15 is connected to the anode of the isolation diode D6, the cathode of the isolation diode D6 is directly connected to the CPU control IO port IO2 and grounded through the key S1, and the other end of the pull-up resistor 15 is directly connected to the CPU control IO port IO 3. Wherein: the CPU detects the IO3 port in real time, and after the key S1 is pressed down, the CPU continuously detects that the key is pressed down, and then the high level is sent out through the IO2 port to cut off the system power, and the one-key shutdown action is completed.
In the present invention, the lithium battery booster circuit 5 includes: the boost circuit comprises a boost enabling resistor R7, a power inductor L1, a lithium battery booster IC2, boost feedback resistors R9 and R10, a boost output current limiting resistor R8, a boost output load capacitor C2 and a boost output filter capacitor C3. One end of a boosting enabling resistor R7 is directly connected with the power output of the one-key startup circuit control circuit 3, the other end of the boosting enabling resistor R7 is connected with an enabling control end EN of a lithium battery booster IC2, meanwhile, the power output end of the one-key startup circuit control circuit 3 is connected with an input pin of the lithium battery booster IC2 through a power inductor L1, one end of a boosting output current limiting resistor R8 is connected with a current limiting resistor setting pin of a lithium battery booster IC2, and the other end of the boosting output current limiting resistor R8 is directly grounded; the output end of the lithium battery booster IC2 is connected to the feedback pin of the IC2 after being divided by the feedback resistors R8 and R9, and the output end of the IC2 is connected in parallel with the load capacitor C2 and the filter capacitor C3 to filter the output power supply.
In the present invention, the lithium battery power monitoring circuit 6 includes: the USB charging interface voltage monitoring voltage dividing resistors R11 and R12, the lithium battery voltage monitoring voltage dividing resistors R13 and R14, and AD acquisition ports AI0 and AI1 of the CPU port. The power supply pin of the USB charging connection is directly connected to an AD acquisition port AI0 of the CPU port after passing through a voltage dividing resistor R11 and a R12 voltage dividing circuit; the power supply voltage of the lithium battery directly enters an AD acquisition port AI1 of the CPU port after passing through a voltage dividing circuit of a voltage dividing resistor R13 and a voltage dividing circuit R14; wherein: when the voltage of the USB charging interface exceeds a monitoring threshold value, the USB interface is indicated to be charged, and whether the lithium battery is full is judged by monitoring the voltage analysis of the lithium battery; when the voltage of the USB charging interface is lower than the monitoring threshold value, the USB interface is not connected, and whether the lithium battery is under-voltage or not is analyzed by monitoring the voltage of the lithium battery at the moment.
In the present invention, the AD conversion circuit reference voltage circuit 7 includes: precision voltage regulator IC 4. The power input end of the IC4 is the output end of the lithium battery booster circuit 5, and the output end of the IC4 is high-precision power supply voltage and provides a standard reference power supply for the AD acquisition function of the CPU. Wherein: the precision voltage regulator IC4 provides a reference power supply dedicated to the CPU for AD acquisition.
In the present invention, the radar sensor power isolation circuit 8 includes: isolating the DCDC power module IC 5. The power input end of the IC5 is the output end of the lithium battery booster circuit 5, and the output end of the power supply is high-precision high-stability power supply voltage and provides a standard power supply of the radar sensor. Wherein: IC5 provides an isolated power supply dedicated to the radar section circuitry.
In the present invention, the CPU power isolation circuit 9 includes: isolating the DCDC power module IC 6. The power input end of the IC6 is the output end of the lithium battery booster circuit 5, and the output end of the power input end is high-precision high-stability power voltage which provides a CPU and Bluetooth module standard power supply. Wherein: the IC6 provides isolated power supply for the CPU and Bluetooth module IC 7.
In the present invention, the CPU control circuit 10 includes: ARM-Cortex M4 core based CPU IC 8. Wherein: the IC8 mainly completes input detection and output control of a digital IO port, signal monitoring of an analog port, serial port communication with a radar special processor and serial port communication with a Bluetooth module IC 7.
In the present invention, the digital-to-analog ground common circuit 11 includes: and the resistor R15 is short-circuited in common.
In the present invention, the bluetooth module circuit 12 includes: bluetooth module IC 7.
In the invention, the CPU comprises an algorithm module which comprises algorithm modules for calculating the speed of a golf ball, the vertical takeoff angle of the golf ball, the flying landing point distance of the golf ball, the total flying distance of the golf ball and the like; the algorithm modules comprise a core algorithm and a precision correction algorithm which are all completed in the CPU. The details are as follows.
(1) The golf ball speed algorithm module has the core algorithm formula as follows:
V＝FFTN*fs/FFTPOINT/44/K；
wherein:
FFTN: labeling values of frequency points in the FFT calculation result;
fs: the frequency is adopted for the signal, and is fixed to be 22530 Hz;
FFTPOINT: the number of points of the FFT algorithm is fixed to 256 points;
k: km/h and MPH units are converted to coefficients, where 1.9706f is taken.
Based on the core algorithm, the actual output value is corrected and calibrated in a targeted manner through a large number of actual tests and corrections, and finally the golf ball speed parameter value is output, and meanwhile, the core algorithm is verified to be effective for all club types.
(2) The vertical takeoff angle algorithm module has a core algorithm with the calculation formula as follows:
AngleCalcu＝Angle(Ganhao,SpeedBz,SpeedReal)
wherein:
anglecalcu: is the output vertical takeoff angle value in degrees;
ganhao: is the club number of the current swing;
SpeedBZ: calculating swing efficiency as a maximum ball speed value/a second maximum ball speed value measured during the swing, for swing efficiency of the swing, and keeping 2 to a decimal;
SpeedReal: the maximum ball speed value output for the swing measurement is expressed in MPH.
(3) The flight landing point distance algorithm module has a core algorithm calculation formula as follows:
Speedms＝Speed*MPH/KMH；
CarryYard＝2*Speedms*Speedms*sin(AngleCalcu*PI/ANGLEH)* cos(AngleCalcu*PI/ANGLEH)/ZLG；//
CarryYard＝CarryYard/YARD；
CarryYard＝2*Speedms^2*sin(Angle*PI/ANGLEH)*cos(Angle*PI/ANGLEH)/ZLG/Yard；
wherein:
CarryYard: the unit of the measured flying distance is yard;
speedms: the unit is m/s which is the maximum ball speed measured at this time;
angle: the measured vertical takeoff angle is the unit of degree;
PI: the circumferential ratio pi;
ANGLEH: constant, 180 °;
ZLG: is the gravity acceleration with the unit of m/s ^ 2;
and Yard: m and Yard distance unit conversion coefficient, take 0.9144 f.
Based on the core algorithm, the actual output value is corrected and calibrated in a targeted manner through a large number of actual tests and corrections, and finally the result value of the distance between the flight and landing points of the golf ball is output, and meanwhile, the core algorithm is verified to be effective for all types of golf clubs.
(4) The total flying distance algorithm module has a core algorithm with the calculation formula as follows:
considering that the relevance of the total flight distance parameter and factors such as actual field materials and weather is large, the algorithm formula comprehensively considers the field material factors and the weather conditions, and the formula is synthesized as follows:
Carry＝CarryYard+M*S*CarryYrd/Bl
wherein:
CarryYard: the unit of the measured flying distance is yard;
m: the default is 1 for the conversion coefficient of the site material;
k: the weather is the weather coefficient, the current weather is 1 in sunny days, and the weather is 0.2 in rainy days;
BI: default is 6.0 for distance versus standard factor.
Based on the core algorithm, the actual output value is corrected and calibrated in a targeted manner through a large number of actual tests and corrections, and finally the result value of the total flying distance of the golf ball is output, and meanwhile, the core algorithm is verified to be effective for all club types.
The invention provides a golf radar sensor mainboard circuit, which has the following working principle:
the charging function of the lithium battery charging circuit 2 is that after the charging circuit is connected with a charger through the USB charging interface U1, the charging circuit directly starts working. The function has no dependency relationship with other functional circuits, is only responsible for charging the lithium battery, and externally prompts the current charging condition according to the fact that a red indicator light DL1 and a full green indicator light DL2 are charged in the charging process by detecting the real-time charging state condition of the lithium battery. When DL1 is on, it indicates that it is currently charging, and when DL2 is on, it indicates that it is fully charged, the two indicator lights will not be on at the same time.
Except for the lithium battery charging circuit 2, the working steps of other functional circuits are as follows:
after a key S1 of the one-key startup control circuit 3 is pressed, the power supply of the whole system is directly conducted in a hardware mode, the lithium battery booster circuit 5 is directly started to work to boost the voltage of a lithium battery to VDD, then the AD conversion circuit reference voltage circuit 7 starts to output a special reference power supply AVDDS for AD analog-digital acquisition, the radar sensor power isolation circuit 8 starts to output a special isolation power supply for a radar circuit part, and the CPU power isolation circuit 9 starts to output a special isolation power supply for a CPU and a Bluetooth module; wherein, CPU control circuit directly exports the control that low level signal took over whole power system through IO2 port first after the start (button S1 is no matter pressed or bounce will not be in the power control who influences the system this moment), then directly open bluetooth connection service engineering after bluetooth module IC7 starts, wait for cell-phone APP to establish the bluetooth and connect, in case cell-phone APP establishes connection with bluetooth module IC7, then whole measurement and data transmission passageway establish and finish, can get into normal swing batting action this moment, get into data measurement and data transmission process.
After the computer is started and enters a normal use stage, the CPU continuously scans an IO3 port, judges whether a key S1 is pressed down, and outputs high level to close DL1 and DL2 indicator lamps through the IO0 and IO1 ports once the key S1 is continuously detected to be pressed down for more than 3 seconds, so that a user is prompted to release the key to complete shutdown operation.
After the start-up enters a normal use stage, the CPU carries out continuous AD acquisition on AI0 and AI1 ports, judges whether a charging wire is connected to a USB charging interface U1, and simultaneously detects the voltage of a lithium battery in real time, wherein the logic relation is as follows: after the system is started, the indicating lamp control logics of DL1 and DL2 are fully taken over by IO0 and IO1 ports of the CPU, if the CPU detects that the voltage of the U1 port exceeds a threshold value, the charging state is indicated to be charged through a lithium battery, the charging state is directly determined by the voltage of the lithium battery measured by AI1, if the electric quantity of the lithium battery is lower than 4.1V, DL1 is bright to indicate continuous charging, and if the electric quantity of the lithium battery is higher than 4.2V, DL2 is bright to indicate that the lithium battery is fully charged; if the CPU detects that no voltage at the U1 port exceeds the threshold value, the current lithium battery is not in a charging state, and the state of the indicator light is determined by the voltage of the lithium battery measured by AI 1; if the electric quantity of the lithium battery is lower than 3.7V, DL1 is lighted to indicate that the battery is under-voltage (at the moment, the voltage of the lithium battery is not suitable for the current continuous use), and if the electric quantity of the lithium battery is higher than 3.9V, DL2 is lighted to indicate that the lithium battery is slow (at the moment, the voltage of the lithium battery can be continuously used).
The invention solves the problem of power supply influence on the radar sensor signal processing and measuring circuit in the working process of the Bluetooth module by adopting a DCDC power supply isolation mode.
The shell made of polycarbonate material is adopted, so that the influence of the shell on the radar signal receiving and transmitting is reduced.
Compared with the prior art of the same type, the invention has the following advantages:
(1) the expansibility is strong: the current mainboard scheme can quickly realize the synchronous functions of USB interface charging and data transmission on the basis of the existing USB interface charging and Bluetooth transmission, can quickly expand a local LCD display mode of the mainboard when the data of the mobile phone APP is displayed, and is easy to form product serialization;
(2) smaller volume, lighter weight: compared with the conventional 7.4V lithium battery pack scheme, the flat 3.7V lithium battery scheme is adopted, so that the occupied space of the battery is reduced structurally, the volume and the weight of the product are reduced integrally, and the carrying is more convenient;
(3) the modular design is convenient for various application occasions: the product of wireless bluetooth transmission, the product of USB wired transmission and the product of two unification functions can be swiftly exported in combination with user's requirement.
Drawings
FIG. 1 is a schematic circuit diagram of a golf ball radar sensor motherboard according to the present invention.
Reference numbers in the figures: the system comprises a lithium battery charging and discharging state indicator lamp control circuit 1, a lithium battery charging circuit 2, a one-key starting control circuit 3, a one-key shutdown circuit 4, a lithium battery boosting circuit 5, a lithium battery electric quantity monitoring circuit 6, an AD conversion circuit reference voltage circuit 7, a radar sensor power supply isolation circuit 8, a CPU power supply isolation circuit 9, a CPU control circuit 10, a digital ground analog ground common ground circuit 11 and a Bluetooth module circuit 12.
Detailed Description
The main board circuit of the golf radar sensor of the invention is shown in figure 1. The system adopts a modularized functional design and comprises a one-key startup circuit, a one-key shutdown circuit, a USB lithium battery charging circuit, a lithium battery charging and discharging indicator lamp circuit, a lithium battery voltage detection circuit, an AD conversion circuit reference power supply circuit, a radar sensor isolation circuit, a CPU power supply isolation circuit, a CPU control system circuit, a digital analog common ground circuit and a Bluetooth module circuit.
The main design of the main board has the following advantages and characteristics:
(1) the USB interface function is switched conveniently: the USB interface has functions of charging, communication and ISP program downloading in the design, the charging and the communication can work simultaneously and the ISP program downloading works independently according to the function distribution design, in order to exert the functions of the USB interface as much as possible, a short-circuit process design is adopted in the design, and key function configuration in the whole production process of the product is switched by disconnecting/short-circuit process points (the ISP program downloading function is used in the production engineering, and the charging and the communication functions are used in the product factory application);
(2) the lithium battery electric quantity state indicating function is intelligent: because the state of lithium cell receives the influence of two kinds of different states in the in-service use: the method comprises the following steps that (1) the charging state and the non-charging state are adopted, the electric quantity state judgment standards of the battery are completely different in the two states, and the battery electric quantity alarm states in different states are confirmed through a hardware circuit and a software design in the design;
in a charging state: if the system does not enter the normal working state of power-on, the battery state directly has the external indicator lamp controlled by the lithium battery charging IC to give prompt information; if the system is normally powered on, the system monitors the voltage of the lithium battery to jointly judge whether the lithium battery is full through the USB plug-in charging state;
in the uncharged state: the CPU is directly connected to monitor the electric quantity state of the lithium battery, and can directly judge the battery state and give a state prompt;
(3) lithium battery booster circuit stability is good: in actual use, the lithium battery booster circuit mainly refers to boosted power supply voltage and available effective power; considering that the Bluetooth module can cause power bounce in the data communication process, the power supply is mainly designed on the power supply stability, the requirements of a manual are fully referred to in the device type selection and PCBlayout design in actual use, and the output voltage and the power are reliable and stable; practical tests show that the power supply has good ripple parameters and load carrying capacity;
(4) functional modular design: the radar sensor isolation power supply loop unit, the CPU isolation power supply loop unit and the Bluetooth function unit are all designed by adopting independent modules, and can be conveniently and quickly cut in the process of combining on-site actual use, so that diversified requirements and applications of users are met;
from the functional design, the main board circuit mainly completes the power system and the related interface design of the system, and the core functional technical indexes are as follows:
(1) an analog signal acquisition port: the 4 paths are currently used, and the 2 paths are respectively used for monitoring the USB interface insertion condition and the lithium battery electric quantity condition;
(2) serial port communication path number: 4 paths are currently used by the CPU, wherein one path is used for communicating with a radar sensor core board, the other path is used for communicating with a Bluetooth module, the other path is used for downloading a program by an ISP (internet service provider), and the other path is used for outputting state debugging information of the CPU;
(3) a charging interface: 1 path, adopting a standard Type-C interface design;
(4) the anti-interference design of the analog circuit: a common-mode filter design is designed in the power interface system, and common-mode interference signals are restrained from entering the analog power system through the power interface.
According to the golf radar sensor mainboard circuit designed by the invention, a large number of actual field tests are carried out, calibration and modification are repeated until a stable, reliable and accurate state is obtained, and finally the technical scheme of the invention is determined. The following measured data records of the golf ball hit by two different clubs were randomly extracted and are shown in table 1:
table 1, measured data record:
wherein, the serial numbers 1-12 are No. 7 iron poles, and the serial numbers 13-24 are No. 1 wood poles.
The comparison and analysis of the data show that the system measurement errors are controlled to be 0.4 percent FS by adopting the circuit scheme of the invention.
Claims (12)
1. A golf ball radar sensor motherboard circuit, comprising: the system comprises a lithium battery charging and discharging state indicating lamp control circuit (1), a lithium battery charging circuit (2), a one-key starting control circuit (3), a one-key shutdown circuit (4), a lithium battery boosting circuit (5), a lithium battery electric quantity monitoring circuit (6), an AD conversion circuit reference voltage circuit (7), a radar sensor power isolation circuit (8), a CPU power isolation circuit (9), a CPU control circuit (10), a digital ground analog ground common ground circuit (11) and a Bluetooth module circuit (12); wherein: the output end of the lithium battery boosting circuit (5) is connected with the input ends of the AD conversion circuit reference voltage circuit (7), the radar sensor power isolation circuit (8) and the CPU power isolation circuit (9), and the output end of the lithium battery charging circuit (2) is connected with the one-key starting control circuit (3); wherein:
the lithium battery charging and discharging state indicator lamp control circuit (1) is used for prompting the state of a system battery, and the state of a system power supply directly influences the stability of the whole system; the normal application requirement of the system can be met when the power supply voltage of the lithium battery is between 3.5V and 4.2V, the power supply state indicator light prompts green at the moment, once the battery voltage is continuously detected to be lower than 3.5V, the power supply state indicator light prompts red, the device is prompted to be charged at the moment, and otherwise, the accuracy of the measurement result is directly influenced;
the lithium battery charging circuit (2) is mainly used for charging the lithium battery, the state condition of the battery is automatically managed by a charging management IC in the charging process, and a green indicator lamp is lightened by the charging management IC output information to prompt that the charging is finished after the battery is fully charged;
the one-key startup control circuit (3) is matched with the one-key shutdown control circuit (4) for use, and is mainly used for system startup;
the one-key power-off control circuit (4) is matched with the one-key power-on control circuit (3) for use and is mainly used for system power-off, when the power-on key is manually pressed and kept for more than 3 seconds, the CPU continuously detects that the key is pressed, controls all indicator lamps to be completely extinguished at the moment, prompts that the system software is powered off, releases the key system to disconnect the power supply from the hardware at the moment, and accordingly, the power-off operation is completed on the hardware and the software;
the lithium battery boosting circuit (5) mainly boosts the voltage of the lithium battery from 3.7-4.2V to 5V so as to provide input power supplies of a subsequent AD conversion circuit reference voltage circuit (7), a radar sensor power supply isolation circuit (8) and a CPU power supply isolation circuit (9) and provide proper power supply input for the core function module;
the lithium battery electric quantity monitoring circuit (6) is mainly used for detecting the voltage state of the lithium battery in real time and judging whether the state of the lithium battery meets the power supply input requirement of the system or not;
the AD conversion circuit reference voltage circuit (7) mainly provides a stable reference power supply for the AD acquisition functional unit of the system so as to avoid the influence on the working reliability of the system caused by the wrong judgment of the working state of the system;
the radar sensor power supply isolation circuit (8) mainly provides an independent, stable and reliable power supply system for the radar sensor, the radar sensor part is an analog working system, other functional parts are digital working systems, and the isolation power supply system is adopted to ensure the working stability of the radar sensor;
the CPU power supply isolation circuit (9) mainly provides power supply for the CPU and other digital working systems, completes system isolation from the analog part of the radar sensor in design and enhances the working stability of the system;
the CPU control circuit (10) is a core processing and control unit and is used for completing battery power AD acquisition, conventional IO port output control, communication with the radar sensor and communication with the wireless Bluetooth module;
the digital ground analog ground common ground circuit (11) is used for realizing one point common ground of the system;
the Bluetooth module circuit (12) is mainly a wireless communication interface, the CPU sends out processed data results in a Bluetooth wireless mode, and the mobile phone APP receives the processed data results through Bluetooth to complete data transmission of the system.
2. The motherboard circuit of a golf radar sensor according to claim 1, wherein the control circuit (1) of the lithium battery charge/discharge status indicator light comprises: the LED lamp comprises a charging current-limiting resistor R1, indicator lamp power selection diodes D1 and D2, indicator lamp current-limiting resistors R2 and R3, a charging red indicator lamp DL1, a full green indicator lamp DL2, and indicator lamp control logic selection diodes D3 and D4; one end of a current limiting resistor R1 is directly connected to a USB interface power supply terminal, the other end is connected to indicator lamps DL1 and DL2 through a diode D1, power supplies of the indicator lamps DL1 and DL2 are provided, the other ends of the indicator lamps DL1 and DL2 are respectively connected to indicator lamp current limiting resistors R2 and R3, the other end of the current limiting resistor R2 is connected to a charging indicating pin of a charging management chip IC1 and is connected to an IO0 port of a CPU through the diode D3 when the current limiting resistor R3 passes, the other end of the current limiting resistor R3 is connected to a full indicating pin of the charging management chip IC1 and is connected to an IO1 port of the CPU through a diode D4 when the current limiting resistor R2 passes.
3. Golf radar sensor main board circuit according to claim 1, characterized in that the lithium battery charging circuit (2) comprises: the intelligent charging system comprises a USB charging interface U1, a charging current-limiting resistor R1, indicator lamp power selection diodes D1 and D2, indicator lamp current-limiting resistors R2 and R3, a charging red indicator lamp DL1, a fully charged green indicator lamp DL2, indicator lamp control logic selection diodes D3 and D4, a lithium battery charging management chip IC1 and a charging current-limiting setting resistor R4; one end of a current limiting resistor R1 is directly connected to a USB interface power supply terminal, the other end of the current limiting resistor R1 is connected to indicator lamps DL1 and DL2 through a diode D1 to provide power for the indicator lamps DL1 and DL2, the other ends of the indicator lamps DL1 and DL2 are respectively connected with indicator lamp current limiting resistors R2 and R3, the other end of a current limiting resistor R2 is connected to a charging indication pin of a charging management chip IC1, the current limiting resistor R3 is connected to an IO0 port of a CPU through a diode D3, the other end of a current limiting resistor R3 is connected to a full indication pin of the charging management chip IC1, the current limiting resistor R4 is connected to an IO1 port of the CPU through a diode D4, and the charging current limiting setting resistor R4 is connected to a charging current setting pin of the charging management IC 1; wherein: after the USB charging wire is connected to the U1 port, the circuit automatically switches the indicator light control authority and is controlled by the lithium battery charging management chip IC 1.
4. The golf ball radar sensor board circuit according to claim 1, wherein the one-touch power-on control circuit (3) comprises: the current limiting resistor R5, the PMOS tube PQ1, a key S1, an isolation diode D5 and a CPU control IO port IO 2; the pull-up resistor R5 is connected to one end of the key S1, and the other end of the key S1 is directly connected to the negative electrode of the battery; meanwhile, the S pole of the PMOS pipe PQ1 is directly connected to the positive power supply, the G pole is connected to the control IO2 port of the CPU after being connected to the diode D5 and is also connected to the pull-up resistor R5, and the D pole is directly output by the power supply; after the key S1 is pressed, the system power supply is conducted from hardware, once the CPU is started, the CPU immediately sends low level through an IO2 port to take over the power supply control system, and the one-key starting function is completed.
5. The golf radar sensor board circuit according to claim 1, wherein the one-touch off control circuit (4) comprises: pull-up resistor R15, isolation diode D6, key S1 and CPU control IO port IO 3; the pull-up resistor R15 is connected to the anode of the isolation diode D6, the cathode of the isolation diode D6 is directly connected to the CPU control IO port IO2 and grounded through the key S1, and the other end of the pull-up resistor 15 is directly connected to the CPU control IO port IO 3; the CPU detects the IO3 port in real time, and after the key S1 is pressed down, the CPU continuously detects that the key is pressed down, and then the high level is sent out through the IO2 port to cut off the system power, and the one-key shutdown action is completed.
6. Golf ball radar sensor main board circuit according to claim 1, characterized in that the lithium battery booster circuit (5) comprises: the boost circuit comprises a boost enabling resistor R7, a power inductor L1, a lithium battery booster IC2, boost feedback resistors R9 and R10, a boost output current limiting resistor R8, a boost output load capacitor C2 and a boost output filter capacitor C3; one end of a boosting enabling resistor R7 is directly connected with the power output of the one-key startup circuit control circuit 3, the other end of the boosting enabling resistor R7 is connected with an enabling control end EN of a lithium battery booster IC2, meanwhile, the power output end of the one-key startup circuit control circuit 3 is connected with an input pin of the lithium battery booster IC2 through a power inductor L1, one end of a boosting output current limiting resistor R8 is connected with a current limiting resistor setting pin of a lithium battery booster IC2, and the other end of the boosting output current limiting resistor R8 is directly grounded; the output end of the lithium battery booster IC2 is connected to the feedback pin of the IC2 after being divided by the feedback resistors R8 and R9, and the output end of the IC2 is connected in parallel with the load capacitor C2 and the filter capacitor C3 to filter the output power supply.
7. Golf radar sensor main board circuit according to claim 1, characterized in that the lithium battery charge monitoring circuit (6) comprises: the USB charging interface voltage monitoring voltage dividing resistors R11 and R12 and the lithium battery voltage monitoring voltage dividing resistors R13 and R14; the power supply pin of the USB charging connection is directly connected to an AD acquisition port AI0 of the CPU port after passing through a voltage dividing resistor R11 and a R12 voltage dividing circuit; the power supply voltage of the lithium battery directly enters an AD acquisition port AI1 of the CPU port after passing through a voltage dividing circuit of a voltage dividing resistor R13 and a voltage dividing resistor R14; when the voltage of the USB charging interface exceeds a monitoring threshold value, the USB interface is indicated to be charged, and whether the lithium battery is full is judged by monitoring the voltage analysis of the lithium battery; when the voltage of the USB charging interface is lower than the monitoring threshold value, the USB interface is not connected, and whether the lithium battery is under-voltage or not is analyzed by monitoring the voltage of the lithium battery at the moment.
8. The golf radar sensor board circuit according to claim 1, wherein the AD conversion circuit reference voltage circuit (7) comprises: the power supply input end of the precision voltage stabilizer IC4 is the output end of the lithium battery booster circuit (5), and the output end of the precision voltage stabilizer IC4 is high-precision power supply voltage and provides a special reference power supply for the AD modulus acquisition function of the CPU.
9. The golf radar sensor motherboard circuit as recited in claim 1, wherein:
the radar sensor power isolation circuit (8) includes an isolation DCDC power module IC 5; the power supply input end of the power supply module IC5 is the output end of the lithium battery booster circuit (5), and the output end of the power supply module IC5 is high-precision high-stability power supply voltage and provides a standard power supply for the radar sensor;
the CPU power isolation circuit (9) includes: an isolated DCDC power module IC 6; the power input end of the power module IC6 is the output end of the lithium battery booster circuit (5), and the output end of the power module IC6 is high-precision high-stability power voltage and provides a CPU and Bluetooth module standard power supply.
10. The golf radar sensor board circuit according to claim 1, wherein the CPU control circuit (10) comprises: based on a CPU IC8 of an ARM-Cortex M4 core, the IC8 mainly completes input detection and output control of a digital IO port, signal monitoring of an analog port, serial port communication with a radar special processor and serial port communication with a Bluetooth module IC 7.
11. Golf radar sensor board circuit according to claim 1, characterized in that the digitally analog ground common ground circuit (11) comprises a common ground shorting resistor R15; the bluetooth module circuit 12 includes a bluetooth module IC 7.
12. The main board circuit of the golf radar sensor as claimed in claim 1, wherein the CPU comprises an algorithm module, and the algorithm module comprises an algorithm module for calculating the speed of the golf ball, the vertical takeoff angle of the golf ball, the flight landing point distance of the golf ball, and the total flight distance of the golf ball; the algorithm modules respectively comprise a core algorithm and a precision correction algorithm, and the method comprises the following specific steps:
(1) the golf ball speed algorithm module has the core algorithm formula as follows:
wherein:
FFTN: labeling values of frequency points in the FFT calculation result;
fs: the frequency is adopted for the signal, and is fixed to be 22530 Hz;
FFTPOINT: the number of points of the FFT algorithm is fixed to 256 points;
k: km/h and MPH unit conversion coefficient, wherein 1.9706f is taken;
on the basis of the core algorithm, the actual output value is corrected and calibrated in a targeted way through a large number of actual tests and corrections, and finally the golf ball speed parameter value is output, and meanwhile, the core algorithm is verified to be effective for all club types;
(2) the vertical takeoff angle algorithm module has a core algorithm with the calculation formula as follows:
wherein:
anglecalcu: is the output vertical takeoff angle value in degrees;
ganhao: is the club number of the current swing;
SpeedBZ: calculating swing efficiency as a maximum ball speed value/a second maximum ball speed value measured during the swing, for swing efficiency of the swing, and keeping 2 to a decimal;
SpeedReal: the maximum ball speed value output for the swing measurement is in MPH unit;
(3) the flight landing point distance algorithm module has a core algorithm calculation formula as follows:
Speedms = Speed * MPH / KMH；
CarryYard = 2*Speedms*Speedms*sin(AngleCalcu*PI/ANGLEH) *
cos(AngleCalcu*PI/ANGLEH)/ZLG；
CarryYard = CarryYard / YARD；
wherein:
CarryYard: the unit of the measured flying distance is yard;
speedms: the unit is m/s which is the maximum ball speed measured at this time;
angle: the measured vertical takeoff angle is the unit of degree;
PI: the circumferential ratio pi;
ANGLEH: constant, 180 °;
ZLG: is the gravity acceleration with the unit of m/s ^ 2;
and Yard: m and Yard distance unit conversion coefficient, take 0.9144 f;
on the basis of the core algorithm, the actual output value is corrected and calibrated in a pertinence way through a large number of actual tests and corrections, and finally the result value of the distance between the flight and the landing points of the golf ball is output, and the core algorithm is verified to be effective for all types of golf clubs;
(4) the total flying distance algorithm module has a core algorithm with the calculation formula as follows:
considering that the relevance of the total flight distance parameter to actual field materials and meteorological factors is large, the algorithm formula comprehensively considers the field material factors and the weather conditions, and the algorithm formula is synthesized as follows:
wherein:
CarryYard: the unit of the measured flying distance is yard;
m: the default is 1 for the conversion coefficient of the site material;
k: the weather is the weather coefficient, the current weather is 1 in sunny days, and the weather is 0.2 in rainy days;
BI: default is 6.0 for distance versus standard factor.
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