CN104020693A - Real-time data collecting system for handheld device - Google Patents
Real-time data collecting system for handheld device Download PDFInfo
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Abstract
The invention discloses a real-time data collecting system for a handheld device. The real-time data collecting system comprises a data collecting module, a wireless data module, a data communication module, a power supply module and a computer. According to the data collecting system, STM32F103 and C8051F340 are used as control cores for completing data collecting and data communication. A signal conditioning circuit comprises a voltage and current signal conditioning circuit. The wireless data module uses a CC1101 radio frequency chip for data transmission. The computer is connected with the data communication module through a USB interface. The power supply module uses an AMS1117 chip for voltage converting, and 3.3V voltage is generated to provide power for a main controller and other chips. The data collecting system has the advantages of being low in cost, wireless data transmission is achieved, operation is easy, data collecting interfaces are abundant, and the real-time data collecting system can be widely used a mobile real-time testing system of the handheld device.
Description
Technical field
The invention belongs to power electronics applied technical field, relate in particular to a kind of real-time data acquisition system for handheld device.
Background technology
Along with the widespread use of computing machine and the development of electronic technology, digital technology is widely used in the every field such as national economy, national defense construction and scientific experiment.Compare with simulation system, digital display circuit has the series of advantages such as precision is high, good stability.Extraneous tested measurement, as temperature, pressure, position etc., need to convert the physical quantity such as voltage, electric current to by all kinds sensor.Because most of sensor output physical quantity is analog quantity, thereby need to be converted to after digital signal, then is stored, processes, shows or printed by computing machine.
Along with the raising of industrial field control to parameter requirement of real-time, precision, capacity, power consumption and the anti-interference etc. of people to data acquisition and storage system have had higher requirement, and therefore various high-performance MCU and storer occur one after another.Along with the development of SOC (system on chip) technology, require more and more various functions to be integrated in one, the embedded SOC chip of the numerous and confused release of some well-known manufacturers.By A/D, it is upper that the functions such as D/A are integrated in MCU, and its great advantage is to have simplified system peripherals circuit design, reduces system power dissipation, and system bulk is dwindled greatly.Along with microelectronics and technical development of computer, formed gradually mixed type based on computer acquisition system, this system architecture is widely used and development fast in computer application field simultaneously.It is made up of computing machine and microcontroller device, for example, is connected by Standard bus interface (RS232, RS485, CAN, USB etc.).By data acquisition system (DAS) functional analysis design configurations microcontroller and peripheral circuit thereof and equipment are formed, main frame uses Development of Virtual Instrument host computer testing software, and this data acquisition system (DAS) has the tasks such as man-machine interaction, complicated calculations analysis, data stored record, figure demonstration.Hybrid computer data acquisition system (DAS) have system development have independence, flexibly system configuration, make full use of the features such as host computer resource.
At present, another important development trend is to use wireless communication technique to carry out data acquisition, high-frequency radio frequency recognition technology be in the world state-of-the-art the 4th generation automatic identification technology, be just to have started in recent years the new technology of rising and being applied rapidly.The raw manufacturer of IC that NordicVLSIASA, Freascale, Atmel etc. have the international influence short-distance wireless data communication transceiving chip of new generation that all released one after another, the wireless chip performance taking nRF905, CC1101 as main flow has obtained large increase.Modulating/demodulating chip, high/low audio amplifier etc. that up-to-date radio transmitting and receiving chip needs whole radio communications are all integrated in chip, peripheral components is significantly reduced, be easy to be connected and realize high reliability radio communication with various model microcontrollers, making to develop wireless product cost reduces greatly, development difficulty is simpler, applies more extensive.The feature such as generally speaking high-frequency radio frequency recognition technology has distance, recognition accuracy is high, recognition speed is fast, antijamming capability is strong, long service life, penetrable nonmetallic materials, utilization scope are wide.Therefore the Wireless Data Transmission based on uhf band has been applied to the every field in life widely.
Summary of the invention
The defect and the deficiency that exist for above-mentioned prior art, the object of the invention is to, a kind of real-time data acquisition system for handheld device is provided, it is low that data acquisition system (DAS) of the present invention has cost, Wireless Data Transmission, feature simple to operate, data acquisition interface is abundant, can be widely used in the mobile real-time testing system of handheld device.
In order to realize above-mentioned task, the present invention adopts following technical solution:
For a real-time data acquisition system for handheld device, it is characterized in that, comprise data acquisition module, wireless data module, data communication module, power module and computing machine.Described data acquisition module control chip adopts 32 ARM microcontrollers that model is STM32F103, the A/D interface of described STM32F103 type microcontroller is connected with measured signal by signal conditioning circuit, the USART interface of described microcontroller is connected with sensor by serial line interface, the GPIO interface of described microcontroller is used for recording switch and pulse signal, and the SPIx interface of described microcontroller is connected with the radiating circuit in wireless data module; Described wireless data module is based on radio frequency chip CC1101 design, and described wireless data module comprises wireless data transmission, receiving circuit; Described data communication module selects the patent C8051F340 microcontroller of Silicon Labs as data receiving and transmitting controller, the GPIO interface of described C8051F340 microcontroller is connected with receive data by wireless circuit, and the USB interface of described C8051F340 microcontroller is connected with computing machine; Described power module adopts AMS1117-3.3 chip to carry out voltage transitions, and producing 3.3V voltage is master controller and other chip power supplies.
Signal conditioning circuit in system is made up of voltage, current signal conditioning circuit; Described voltage signal conditioning circuit comprises voltage reference source circuit, reverse adder unit, High frequency filter unit and voltage follow unit, described reverse adder unit carries out the amplitude conversion of input signal, described voltage follow cellular installation is at input and output side, play isolation and buffer action, described High frequency filter unit forms voltage controlled voltage source low-pass filter with operational amplifier and reduces the high frequency interference in signal; It is that the method for 0.1% electric resistance partial pressure obtains voltage signal that described current signal conditioning unit is selected precision, and carries out input voltage protection by diode.
Voltage reference source circuit in system designs based on controllable accurate source of stable pressure chip TL431 chip (U1), comprise 5k Ohmage (R1), 1k Ohmage (R2), 500 Ohmages (R3), 10K Ohmage (R4, R5, R6), operational amplifier LM324(A1), 10uF electric capacity (C5) and 0.1uF electric capacity (C6), the anode (A) of described source of stable pressure chip (U1) passes through 5k Ohmage (R1) and is connected with reference to the utmost point (VREF), the negative electrode (K) of described source of stable pressure chip (U1) passes through 1k Ohmage (R2) and is connected with reference to the utmost point (VREF), the negative electrode (K) of institute's source of stable pressure chip (U1) is connected with 5V power supply (VCC) by 500 Ohmages (R3), the reference voltage (Uref) producing is connected with the inverting input of operational amplifier (A1) by resistance (R5), the normal phase input end of described operational amplifier (A1) is connected with ground (AGND) by resistance (R6), and the output terminal of described operational amplifier (A1) is connected with its inverting input by resistance (R4), described electric capacity (C5) and electric capacity (C6) are connected in parallel between reference voltage (Uref) and ground (AGND) together, described switch and pulse duration frequency signal Acquisition Circuit are used the auspicious Sa of RENESAS() the PS2801 photoelectric coupling chip produced of company carries out the isolation of collection signal, prevents that external voltage from exceeding chip pin withstand voltage.
The invention has the beneficial effects as follows:
The power-supply system of electronic equipment is the basis of whole system, and the steady operation of this part plays vital effect to the steady operation of whole data acquisition system (DAS).Power supply aspect, each several part or even all likely different with the level value of a part of each pin, therefore must know the power supply requirement of system each several part.The input power of data collecting plate card is direct current 5V, and power demands is STM32F103VE operating voltage 3.3V, RS232, and RS485 chip power supply 3.3V, wireless module power supply 3.3V etc., need to carry out power supply conversion through voltage transitions chip.The input voltage of 5V carries out voltage transitions by AMS1117-3.3 chip, and producing 3.3V voltage is master controller and other chip power supplies.AMS1117 is current widely used low pressure linear voltage regulator, and its cost is low, and circuit is simple, and the electric current of 1A can be provided.Use 10uF electric capacity to be used for elimination ripple at chip pin place, the high frequency clutter in the electric capacity elimination circuit of 0.1uF, has reduced the interference to digital circuit like this, has improved the efficiency of power supply.
Data acquisition Master control chip has been chosen the STM32F103VE microcontroller based on ARM Cortex-M3 kernel, and STM32F103VE is the enhancement mode product of 32 8-digit microcontroller STM32 series of ST Microelectronics's production.ARM Cortex-M3 is ARM company towards low cost, low-power consumption, high performance Embedded Application and the product designing, the a lot of up-to-date technology of ARM company are adopted, compare with similar microprocessor, there is significant advantage, STM32F103VE is by external 8M high speed crystal oscillator, frequency of operation can reach 72 MHz, execution speed under this frequency of operation is 1.25DMIPS/MHz, the SRAM of the flash memories of built-in 512 K bytes and 64 K bytes, has universaling I/O port and the multiple peripheral hardware of 80 enhancings.
The CC1101 radio frequency chip that the data transmission of wireless data acquisition system and receiving function are produced by TI company is realized, CC1101 is a lower than 1GHz high-performance radio-frequency transceiver, has been widely used at present in Detection System for Bridge and industry spot monitoring system.CC1101 radio frequency chip mainly contains following characteristics.In wireless data acquisition system, CC1101 radio frequency chip connection data collection terminal and PC end, complete the data communication at two ends, comprises host computer acquisition, the transmission of acquisition parameter and the passback of image data.Data collecting plate card based on STM32F103VE controller is connected with CC1101 with spi bus interface by GPIO port, completes read-write and working state monitoring to CC1101 radio frequency chip register, realizes the transmission of image data.
PC data communication module has selected the patent CIP-51 microcontroller C8051F340 of Silicon Labs as data receiving and transmitting controller, and C8051F340 adopts pipeline organization, has greatly promoted CISC structure travelling speed, and maximum operational speed can reach 48MHz.Along with the development of sensor and electronic communication, sensor internal can be converted to digital signal by the simulating signal recording by integrated microprocessing unit, send by standard communication protocol interface, can reduce like this simulating signal and in transmitting procedure, sneak into interference, improve signal conversion accuracy.Therefore data collecting plate card has designed RS232 interface and RS485 interface, and serial data interface mainly completes 3 kinds of functions: pick-up transducers output data; Be connected with unmanned plane serial data communication interface, obtain in unmanned aerial vehicle test process, the measurement data of airborne sensor, also can receive the control supplemental characteristic in UAV Flight Control System, and draws out control curve, and whether access control algorithm is feasible; In the debugging of the initial stage of data collecting plate card, be connected with computing machine by serial data communication interface, utilize host computer COM Debug Assistant and data collecting plate card to complete data communication, whether the each acquisition module of verification msg analog input card normally works.
It is low that data acquisition system (DAS) of the present invention has cost, and Wireless Data Transmission is simple to operate, and the feature that data acquisition interface is abundant can be widely used in the mobile real-time testing system of handheld device.
Brief description of the drawings
Below in conjunction with the drawings and specific embodiments, the present invention is further explained.
Fig. 1 is the real-time data acquisition system block diagram of this handheld device;
Fig. 2 is the voltage reference source circuit of this system signal modulate circuit;
Fig. 3 is the reverse adding circuit of this system signal modulate circuit;
Fig. 4 is the voltage controlled voltage source low-pass filter of this system signal modulate circuit;
Fig. 5 is the buffer circuit of this system switching and pulse signal circuit.
Embodiment
Fig. 1 is the real-time data acquisition system block diagram for handheld device, and in figure, system comprises data acquisition module, wireless data module, data communication module, power module and computing machine.Described data acquisition module control chip adopts 32 ARM microcontrollers that model is STM32F103, the A/D interface of described STM32F103 type microcontroller is connected with measured signal by signal conditioning circuit, the USART interface of described microcontroller is connected with sensor by serial line interface, the GPIO interface of described microcontroller is used for recording switch and pulse signal, and the SPIx interface of described microcontroller is connected with the radiating circuit in wireless data module; Described wireless data module is based on radio frequency chip CC1101 design, and described wireless data module comprises wireless data transmission, receiving circuit; Described data communication module selects the patent C8051F340 microcontroller of Silicon Labs as data receiving and transmitting controller, the GPIO interface of described C8051F340 microcontroller is connected with receive data by wireless circuit, and the USB interface of described C8051F340 microcontroller is connected with computing machine; Described power module adopts AMS1117-3.3 chip to carry out voltage transitions, and producing 3.3V voltage is master controller and other chip power supplies.
Data collecting card allows the voltage range-10V～+ 10V of input, therefore needs input signal to carry out translation and decay.In signal condition passage, operational amplifier adopts LM324, LM324 is inner integrated four chips with differential input amplifier amplifier, this amplifier can be operated in low to 3V or high under the power supply of 32V by single supply, also within the scope of can be operated in ± 1.5V of dual power supply～± 16V, in Subject Design, adopt dual power supply, provide ± 12V of DC-DC power module MDB12-12D12 voltage is provided, voltage signal conventionally needs reference source in the time carrying out translation and decay conversion, reference source choose reference source and the outside reference source that can use built-in chip type, but the reference source driving force that core carries voltage smaller and that provide is constant, therefore select TL431 to produce voltage-reference, TL431 is controllable accurate source of stable pressure, voltage accuracy can reach 0.5%, can nurse one's health passage for voltage high-precision voltage reference is provided, in practical application, use TL431 that 3V voltage be converted to-3V are provided, as the input voltage of subsequent voltage translation and attenuator circuit, voltage reference source circuit figure as shown in Figure 2.
The function of signal condition passage is that be input as-10V～10V voltage signal is converted to 0～3V, if signal condition passage input voltage is VIN, cumbersome owing to using in-phase adder circuit to calculate, therefore select reverse adding circuit, realize the conversion of voltage, in actual design, because resistance precision is inadequate, use slide rheostat to carry out the fine setting of resistance value, realize the circuit diagram of operation relation as Fig. 3.According to sampling thheorem, sample frequency should be at least and be sampled 2 times of signal frequency, and conventionally for good demonstration test data waveform, general sample frequency should be to be sampled 5～10 times of signal frequency.The ADC sample frequency of STM32F103 is up to 1MHz, the effective frequency that data collecting card can gather like this at 200KHz once, in order to reduce the interference of collected signal medium-high frequency signal and anti-aliasing, to adding a low-pass filter in signal condition passage, use amplifier to form a voltage controlled voltage source low-pass filter as shown in Figure 4.
For the signal condition of current signal, selecting precision is that the method for 0.1% electric resistance partial pressure obtains voltage signal, and carries out input voltage protection by diode.Current-output type sensor output signal is generally 4～20mA, has therefore chosen the precision resistance of 150 ohm current signal is converted to the voltage signal of 0.6V～3V, gathers by the ADC of STM32F103VE.Signal condition board is designed with 2 current signal acquisition channels.
The switching value signal that needs to measure tach signal in unmanned plane test macro and represent duty, the measurement of rotating speed is used Hall element or photoelectric sensor to coordinate photoelectricity or gear code-disc to use conventionally, and the signal recording is generally the square-wave signal of 5V～15V.Use the general purpose timer of STM32F103VE microcontroller can measure rectangular wave pulse signal, STM32F103VE has eight 16 bit timing devices, maximum frequency is 72MHz, can be operated in counter mode, input capture pattern, output comparison patterns etc., wherein can use input capture pattern to measure external pulse signal frequency.The GPIO pin of STM32F103VE can be measured external switch amount signal, the switching value signal amplitude that unmanned plane test macro produces is 5～24V, the input ceiling voltage of the pin of STM32F103VE is about 3.6V left and right, part pin has 5V voltage tolerance characteristic, because external voltage exceeds chip pin withstand voltage, in Subject Design, chosen the auspicious Sa of RENESAS() company produce PS2801 photoelectric coupling chip carry out the isolation of collection signal, circuit is as shown in Figure 5.PS2801 is a kind of high speed optoelectronic isolating chip, and more than switching speed can reach 100KHz, the minimum input current of the diode of PS2801 is 3～5mA, and maximum current is 50mA, and therefore choosing input resistance is 1K.When making to input external voltage and being 5～24V, chip can normally be worked.
Although the present invention gives illustration with regard to its preferred embodiment, person skilled in the art is understood that, in the spirit and scope of the present invention defined in described claims, also can make all changes and variation to the present invention.
Claims (4)
1. for a real-time data acquisition system for handheld device, it is characterized in that, comprise data acquisition module, wireless data module, data communication module, power module and computing machine; Described data acquisition module control chip adopts 32 ARM microcontrollers that model is STM32F103, the A/D interface of described STM32F103 type microcontroller is connected with measured signal by signal conditioning circuit, the USART interface of described microcontroller is connected with sensor by serial line interface, the GPIO interface of described microcontroller is used for recording switch and pulse signal, and the SPIx interface of described microcontroller is connected with the radiating circuit in wireless data module; Described wireless data module is based on radio frequency chip CC1101 design, and described wireless data module comprises wireless data transmission, receiving circuit; Described data communication module selects the patent C8051F340 microcontroller of Silicon Labs as data receiving and transmitting controller, the GPIO interface of described C8051F340 microcontroller is connected with receive data by wireless circuit, and the USB interface of described C8051F340 microcontroller is connected with computing machine; Described power module adopts AMS1117-3.3 chip to carry out voltage transitions, and producing 3.3V voltage is master controller and other chip power supplies.
2. a kind of real-time data acquisition system for handheld device as claimed in claim 1, is characterized in that, described signal conditioning circuit is made up of voltage, current signal conditioning circuit; Described voltage signal conditioning circuit comprises voltage reference source circuit, reverse adder unit, High frequency filter unit and voltage follow unit, described reverse adder unit carries out the amplitude conversion of input signal, described voltage follow cellular installation is at input and output side, play isolation and buffer action, described High frequency filter unit forms voltage controlled voltage source low-pass filter with operational amplifier and reduces the high frequency interference in signal; It is that the method for 0.1% electric resistance partial pressure obtains voltage signal that described current signal conditioning unit is selected precision, and carries out input voltage protection by diode.
3. voltage signal conditioning circuit as claimed in claim 2, it is characterized in that, described voltage reference source circuit designs based on controllable accurate source of stable pressure chip TL431 chip (U1), comprise 5k Ohmage (R1), 1k Ohmage (R2), 500 Ohmages (R3), 10K Ohmage (R4, R5, R6), operational amplifier LM324(A1), 10uF electric capacity (C5) and 0.1uF electric capacity (C6), the anode (A) of described source of stable pressure chip (U1) passes through 5k Ohmage (R1) and is connected with reference to the utmost point (VREF), the negative electrode (K) of described source of stable pressure chip (U1) passes through 1k Ohmage (R2) and is connected with reference to the utmost point (VREF), the negative electrode (K) of described source of stable pressure chip (U1) is connected with 5V power supply (VCC) by 500 Ohmages (R3), the reference voltage (Uref) producing is connected with the inverting input of operational amplifier (A1) by resistance (R5), the normal phase input end of described operational amplifier (A1) is connected with ground (AGND) by resistance (R6), and the output terminal of described operational amplifier (A1) is connected with its inverting input by resistance (R4), described electric capacity (C5) and electric capacity (C6) are connected in parallel between reference voltage (Uref) and ground (AGND) together.
4. a kind of real-time data acquisition system for handheld device as claimed in claim 1, it is characterized in that, described switch and pulse duration frequency signal Acquisition Circuit are used the auspicious Sa of RENESAS() the PS2801 photoelectric coupling chip produced of company carries out the isolation of collection signal, prevents that external voltage from exceeding chip pin withstand voltage.
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| CN105045180A (en) * | 2015-07-21 | 2015-11-11 | 中国航天科工集团第三研究院第八三五七研究所 | Electronic device health state acquisition system |
| CN106197474A (en) * | 2016-08-26 | 2016-12-07 | 云南电网有限责任公司 | A kind of high altitude localities helicopter flight condition checkout gear |
| CN104298160B (en) * | 2014-10-27 | 2017-03-15 | 北京必创科技股份有限公司 | A kind of wireless double-core data acquisition device and acquisition method |
| CN108181491A (en) * | 2018-01-03 | 2018-06-19 | 江苏林洋能源股份有限公司 | A kind of method for improving electric energy meter measuring accuracy and measuring reliability |
| CN108683419A (en) * | 2018-05-14 | 2018-10-19 | 河北惠仁医疗设备科技有限公司 | High-precision AD acquisition system based on AD4020 |
| CN110262310A (en) * | 2019-05-09 | 2019-09-20 | 国网吉林省电力有限公司长春供电公司 | Unmanned plane self-balancing landing platform controller |
| CN110275457A (en) * | 2018-03-15 | 2019-09-24 | 沈阳唯实软件有限公司 | A kind of satellite system data inspection real-time collector |
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Effective date of registration: 20201130 Address after: 330000 south of 5th floor, building 15, No. 346, xiaolanzhong Avenue, Xiaolan economic and Technological Development Zone, Nanchang County, Nanchang City, Jiangxi Province Patentee after: Jiangxi Zhonglan Electronic Manufacturing Co., Ltd Address before: 330096, Jiangxi, Nanchang hi tech Zone, innovation, road, Chang Ruifeng, room 717 Patentee before: Xu Yunpeng |