CN111174833A - Data acquisition device for plant bioelectricity and moisture transmission parameters - Google Patents

Data acquisition device for plant bioelectricity and moisture transmission parameters Download PDF

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CN111174833A
CN111174833A CN202010146285.5A CN202010146285A CN111174833A CN 111174833 A CN111174833 A CN 111174833A CN 202010146285 A CN202010146285 A CN 202010146285A CN 111174833 A CN111174833 A CN 111174833A
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power supply
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郝志斌
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Tianjin Agricultural University
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D21/00—Measuring or testing not otherwise provided for
    • G01D21/02—Measuring two or more variables by means not covered by a single other subclass
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
    • G01N5/02—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by absorbing or adsorbing components of a material and determining change of weight of the adsorbent, e.g. determining moisture content
    • G01N5/025—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by absorbing or adsorbing components of a material and determining change of weight of the adsorbent, e.g. determining moisture content for determining moisture content
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
    • G01N5/04—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
    • G01N5/045—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder for determining moisture content
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
    • G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
    • G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
    • G05B19/0423—Input/output
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/20—Pc systems
    • G05B2219/21—Pc I-O input output
    • G05B2219/21137—Analog to digital conversion, ADC, DAC
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/20—Pc systems
    • G05B2219/25—Pc structure of the system
    • G05B2219/25257—Microcontroller

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Abstract

The invention relates to a data acquisition device for plant bioelectricity and moisture transmission parameters, which is technically characterized in that: the system comprises a control unit, a data sensing unit, a data transmission unit, a time service unit, a function configuration unit, a system state output unit, an expansion unit and a power supply unit. The invention can set a data sampling trigger mode and a sampling period, and improve the accuracy and the real-time performance of data; the power supply mode can be automatically adjusted, and the power consumption of the system is reduced; the system state can be automatically tracked and output, and the system maintenance is convenient; and the function integration level is high, the operation is convenient, and a tool is provided for the plant electrophysiological research.

Description

Data acquisition device for plant bioelectricity and moisture transmission parameters
Technical Field
The invention belongs to the technical field of data acquisition, and relates to a data acquisition device for bioelectricity and moisture transmission parameters, in particular to a data acquisition device for plant bioelectricity and moisture transmission parameters.
Background
There is a constantly changing potential difference between the plant stem and the growing soil (or different positions of the plant stem in the longitudinal direction), and the change of the potential difference may be related to the utilization and transmission of plant water, but the specific relation is not clear. In order to find out the relationship between the potential difference change and the moisture transmission parameters (transpiration rate, stem flow rate and root water absorption) and reveal the potential difference change mechanism, long-term, continuous and synchronous potential difference, moisture transmission parameters and environmental parameters need to be acquired.
In the real-time determination of plant moisture transmission parameters, stem flow and weighing measurements are commonly used. The stem flow measurement method (stem flow meter) needs to arrange electrodes in plant stems, and the measurement of bioelectric signals also needs to arrange electrodes in the plant stems, so that potential influence exists between the electrodes. Therefore, the weighing measurement method (such as pot weighing method and communicating vessel method) is more suitable for the experimental research in the field. The measurement by weight means that the plant is placed in a culture vessel and the moisture transmission parameter of the plant is measured by measuring the weight of the vessel. The plant water utilization speed changes with different plant species and growth stages, the magnitude difference of water absorption, transmission and loss in unit time is obvious, and the accuracy of the measurement result is sensitive to the sampling time interval.
Typical weighing assays include potted weighing as shown in FIG. 3 and linker method as shown in FIG. 4:
[ potted plant weighing method ]
firstly, placing plants in a plant culture container, and placing the plant culture container on a pressure sensor;
②, the upper end of the plant culture container is sealed to prevent water from evaporating, and water can only be dissipated through the plant body through transpiration;
reading the measured value of the pressure sensor, and calculating the variation delta W of the measured value in unit time, wherein the variation delta W is approximately equal to the transpiration amount of the plant in unit time;
and fourthly, calculating the ratio of the delta W to the area of the plant sapwood, namely the stem flow rate.
[ CONNECTOR METHOD ]
firstly, communicating a plant culture container 1 with a plant culture container 2, placing plants in the plant culture container 2, and respectively placing the plant culture container 1 and the plant culture container 2 on a pressure sensor 1 and a pressure sensor 2;
sealing the upper ends of the plant culture container 1 and the plant culture container 2 to prevent water from evaporating, wherein the water can only be dissipated through the plant body through transpiration;
③ the measured values of the pressure sensor 1 and the pressure sensor 2, and calculating the variation delta W of the measured values in unit time1And Δ W2The plant transpiration amount per unit time is Er＝ΔW1+ΔW2；
fourthly, calculating ErThe ratio of the area of the plant sapwood to the area of the plant sapwood is the stem flow rate;
calculating the water absorption of the plant in unit time
Figure BDA0002400850040000021
Wherein A is1And A2The water surface areas of the plant culture container 1 and the plant culture container 2, respectively.
However, the sampling period of the existing data acquisition devices for the two weighing and measuring methods is fixed, and the accuracy of the data cannot be ensured; and the defects of low operation convenience and large system power consumption exist. Moreover, when the device is used for collecting various data such as plant bioelectricity and water transmission parameters, the accuracy of the experimental result is influenced to a certain extent because the collected various data cannot be strictly synchronized and the integration level of the data collection function is not high.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides the data acquisition device for the plant bioelectricity and moisture transmission parameters, which has the advantages of reasonable design, synchronous data acquisition and high accuracy of the acquired data.
The invention solves the practical problem by adopting the following technical scheme:
a data acquisition device for plant bioelectricity and moisture transmission parameters comprises a control unit, a data sensing unit, a data transmission unit, a time service unit, a function configuration unit, a system state output unit, an expansion unit and a power supply unit;
the input end of the control unit is connected with the data sensing unit and used for receiving detection data acquired by the data sensing unit in real time; the control unit is also connected with a remote server or a terminal through a data transmission unit and carries out bidirectional communication; the input end of the control unit is also connected with the time service unit and is used for adding timestamp information to the data acquired by the data sensing unit; the input end of the control unit is also connected with the function configuration unit and used for receiving a function configuration instruction input by a user; the output end of the control unit is also connected with a system state output unit and used for outputting a system state code compiled by the control unit to a user; the output end of the control unit is also connected with the expansion unit and is used for being connected with external equipment; the output end of the power supply unit is respectively connected with the control unit, the data sensing unit, the data transmission unit, the time service unit, the function configuration unit, the system state output unit and the extension unit and supplies power to the control unit, the data sensing unit, the data transmission unit, the time service unit, the function configuration unit, the system state output unit and the extension unit.
Furthermore, the control unit comprises a microcontroller and an analog-to-digital converter; the data sensing unit comprises a power supply monitoring module, a bioelectric signal measuring module, an environment temperature and humidity measuring module, a soil temperature and humidity measuring module, an illumination intensity measuring module and a moisture transmission parameter measuring module;
the power supply monitoring module comprises a power supply voltage sampling circuit and an impedance conversion circuit which are connected together, and the output end of the power supply monitoring module is connected with the microcontroller through an analog-to-digital converter and used for monitoring the power supply voltage;
the bioelectrical signal measuring module comprises a plurality of bioelectrical signal interfaces, an amplifier and a low-pass filter which are connected together, wherein the output end of the bioelectrical signal measuring module is connected with the microcontroller through an analog-to-digital converter and is used for acquiring the potential difference between any point of the plant stem and the soil or the potential difference between any two points of the plant stem in the longitudinal direction, and outputting the potential difference to the microcontroller after analog-to-digital conversion;
the environment temperature and humidity measuring module comprises a temperature and humidity measuring circuit, wherein the output end of the temperature and humidity measuring circuit is connected with the microcontroller through an analog-to-digital converter or a bus interface and is used for collecting the environment temperature and humidity;
the soil temperature and humidity measuring module comprises a temperature and humidity measuring circuit, wherein the output end of the temperature and humidity measuring circuit is connected with the microcontroller through an analog-to-digital converter or a bus interface and is used for collecting the temperature and humidity of soil;
the illumination intensity measuring module comprises an illumination intensity measuring circuit, the output end of the illumination intensity measuring circuit is connected with the microcontroller through an analog-to-digital converter or a bus interface and is used for collecting illumination intensity;
the moisture transmission parameter measuring module comprises two paths of pressure sensors, and the output ends of the two paths of pressure sensors are connected with the microcontroller through an analog-to-digital converter or a bus interface and used for measuring moisture transmission parameters;
and the data transmission unit is connected with the control unit, comprises a mobile network access circuit electrically connected with the control unit, can be connected with a remote server or a terminal through a mobile network, and performs bidirectional communication.
And the output end of the time service unit is connected with the control unit, the time service unit comprises an NTP server access circuit electrically connected with the control unit, the NTP server can be connected through a mobile network, a standard clock is obtained, and timestamp information is added to the data obtained by the data sensing unit.
And the function configuration unit comprises a communication interface electrically connected with the control unit, and the output end of the function configuration unit is connected with the control unit and used for outputting a data sampling trigger mode instruction, a sampling period instruction, a moisture transmission parameter measurement method selection instruction and a pressure sensor selection instruction which are input by a user to the control unit.
And the system state output unit comprises a communication interface electrically connected with the control unit, and the input end of the communication interface is connected with the control unit and used for outputting the system state code programmed by the control unit to a user.
And, the extension unit includes a general I/O port of the microcontroller, an analog-to-digital converter interface, an I2C interface, an SPI interface, and a UART interface for connecting with an external device.
Moreover, the power supply unit comprises a 5.0V power supply, a first path of 3.3V power supply and a second path of 3.3V power supply; the 5.0V power supply supplies power to the data transmission unit and the time service unit; the first path of 3.3V power supply supplies power for the control unit, the function configuration unit and the system state output unit; the second path of 3.3V power supply is a controllable power supply, the control unit controls the second path of 3.3V power supply to be turned on or turned off, and the second path of 3.3V power supply supplies power for the data sensing unit and the expansion unit.
The invention has the advantages and beneficial effects that:
the invention provides a data acquisition device for researching the relation between plant bioelectricity and water transmission parameters, which integrates a bioelectricity signal measuring circuit, an environment temperature and humidity measuring circuit, a soil temperature and humidity measuring circuit, an illumination intensity measuring circuit, a water transmission parameter measuring circuit, a data transmission circuit, a function configuration interface, a power supply monitoring and control circuit and a system state output interface, can automatically, continuously and synchronously acquire plant bioelectricity signals, water transmission parameters (transpiration rate, stem flow rate and root water absorption) and environment parameters, and sends data to a remote server or a terminal; a data sampling trigger mode and a sampling period can be set, and the data accuracy and the real-time performance are improved; the power supply mode can be automatically adjusted, and the power consumption of the system is reduced; the system state can be automatically tracked and output, and the system maintenance is convenient; and the function integration level is high, the operation is convenient, and a tool is provided for the plant electrophysiological research.
Drawings
FIG. 1 is a block diagram of a data acquisition device for studying the relationship between plant bioelectricity and water transmission parameters according to the present invention;
FIG. 2(a) is a circuit diagram of the control unit of FIG. 1 in accordance with the present invention;
FIG. 2(b) is a circuit diagram of the data sensing unit of FIG. 1 according to the present invention;
FIG. 2(c) is a circuit diagram of the data transmission unit and the time transfer unit in FIG. 1 according to the present invention;
FIG. 2(d) is a circuit diagram of the function configuration unit and the system status output unit of FIG. 1 according to the present invention;
FIG. 2(e) is a circuit diagram of the expansion unit of FIG. 1 according to the present invention;
FIG. 2(f) is a circuit diagram of the power supply unit of FIG. 1 according to the present invention;
FIG. 3 is a schematic diagram illustrating the weighing method of a potted plant according to the background art of the present invention;
FIG. 4 is a schematic diagram of a connectivity method in the background of the invention;
FIG. 5 is a functional configuration instruction diagram according to the present invention;
FIG. 6 is a schematic diagram of the system state output of the present invention;
FIG. 7 is a process flow diagram of the present invention.
Detailed Description
The embodiments of the invention will be described in further detail below with reference to the accompanying drawings:
a data acquisition device for researching the relation between plant bioelectricity and water transmission parameters is shown in figure 1 and comprises a control unit, a data sensing unit, a data transmission unit, a time service unit, a function configuration unit, a system state output unit, an expansion unit and a power supply unit;
the input end of the control unit is connected with the data sensing unit and used for receiving detection data acquired by the data sensing unit in real time; the control unit is also connected with a remote server or a terminal through a data transmission unit and carries out bidirectional communication; the input end of the control unit is also connected with the time service unit and is used for adding timestamp information to the data acquired by the data sensing unit; the input end of the control unit is also connected with the function configuration unit and used for receiving a function configuration instruction input by a user; the output end of the control unit is also connected with a system state output unit and used for outputting a system state code compiled by the control unit to a user; the output end of the control unit is also connected with the expansion unit and is used for being connected with external equipment; the output end of the power supply unit is respectively connected with the control unit, the data sensing unit, the data transmission unit, the time service unit, the function configuration unit, the system state output unit and the extension unit and supplies power to the control unit, the data sensing unit, the data transmission unit, the time service unit, the function configuration unit, the system state output unit and the extension unit.
In this embodiment, the control unit includes a microcontroller and an analog-to-digital converter; the data sensing unit comprises a power supply monitoring module, a bioelectric signal measuring module, an environment temperature and humidity measuring module, a soil temperature and humidity measuring module, an illumination intensity measuring module and a moisture transmission parameter measuring module;
the power supply monitoring module comprises a power supply voltage sampling circuit and an impedance conversion circuit which are connected together, and the output end of the power supply monitoring module is connected with the microcontroller through an analog-to-digital converter and used for monitoring the power supply voltage;
the bioelectrical signal measuring module comprises a bioelectrical signal interface, an amplifier and a low-pass filter which are connected together in three ways, wherein the output end of the bioelectrical signal measuring module is connected with the microcontroller through an analog-to-digital converter and is used for acquiring the potential difference between any one point of the plant stem and the soil or the potential difference between any two points of the plant stem in the longitudinal direction, and outputting the potential difference to the microcontroller after analog-to-digital conversion;
the environment temperature and humidity measuring module comprises a temperature and humidity measuring circuit, wherein the output end of the temperature and humidity measuring circuit is connected with the microcontroller through an analog-to-digital converter or a bus interface and is used for collecting the environment temperature and humidity;
the soil temperature and humidity measuring module comprises a temperature and humidity measuring circuit, wherein the output end of the temperature and humidity measuring circuit is connected with the microcontroller through an analog-to-digital converter or a bus interface and is used for collecting the temperature and humidity of soil;
the illumination intensity measuring module comprises an illumination intensity measuring circuit, the output end of the illumination intensity measuring circuit is connected with the microcontroller through an analog-to-digital converter or a bus interface and is used for collecting illumination intensity;
the moisture transmission parameter measuring module comprises two paths of pressure sensors, and the output ends of the two paths of pressure sensors are connected with the microcontroller through an analog-to-digital converter or a bus interface and used for measuring moisture transmission parameters;
in this embodiment, the data transmission unit is connected to the control unit, and the data transmission unit includes a mobile network access circuit electrically connected to the control unit, and is capable of connecting to a remote server or a terminal through a mobile network and performing bidirectional communication.
In this embodiment, the output end of the time service unit is connected to the control unit, and the time service unit includes an NTP server access circuit electrically connected to the control unit, and is capable of connecting to an NTP server through a mobile network, acquiring a standard clock, and adding timestamp information to data acquired by the data sensing unit.
In this embodiment, the function configuration unit includes a communication interface electrically connected to the control unit, and an output end of the function configuration unit is connected to the control unit, and is configured to output a data sampling trigger mode instruction, a sampling period instruction, a moisture transmission parameter measurement method selection instruction, and a pressure sensor selection instruction, which are input by a user, to the control unit.
In this embodiment, the system status output unit includes a communication interface electrically connected to the control unit, and an input end of the communication interface is connected to the control unit, and is configured to output the system status code programmed by the control unit to a user.
In this embodiment, the expansion unit includes a general I/O port of the microcontroller, an analog-to-digital converter interface, an I2C interface, an SPI interface, and a UART interface, and is configured to connect to an external device.
In this embodiment, the power supply unit includes a 5.0V power supply, a first path of 3.3V power supply, and a second path of 3.3V power supply; the 5.0V power supply supplies power to the data transmission unit and the time service unit; the first path of 3.3V power supply supplies power for the control unit, the function configuration unit and the system state output unit; the second path of 3.3V power supply is a controllable power supply, the control unit controls the second path of 3.3V power supply to be turned on or turned off, and the second path of 3.3V power supply supplies power for the data sensing unit and the expansion unit.
The composition, function and function of each module are further described below:
the control unit comprises a microcontroller and peripheral circuits thereof, and also comprises an analog-to-digital converter which is electrically connected with the data sensing unit, the data transmission unit, the time service unit, the function configuration unit, the system state output unit, the expansion unit and the power supply unit, and is used for analyzing user instructions, processing data and controlling each unit to work normally.
The data perception unit comprises a power supply monitoring module, a bioelectricity signal measuring module, an environment temperature and humidity measuring module, a soil temperature and humidity measuring module, an illumination intensity measuring module and a moisture transmission parameter measuring module.
The power supply monitoring module comprises a power supply voltage sampling circuit and an impedance conversion circuit which are connected together, and is connected with the control unit through an analog-to-digital converter.
The bioelectrical signal measuring module comprises a bioelectrical signal interface, an amplifier and a low-pass filter which are connected together in three ways, and is connected with the control unit through an analog-to-digital converter. The bioelectric signal refers to the potential difference between any point of the plant stem and the soil or the potential difference between any two points of the plant stem in the longitudinal direction.
The environment temperature and humidity measuring module comprises a temperature and humidity measuring circuit which is connected with the microcontroller through an analog-to-digital converter or a bus interface.
The soil temperature and humidity measuring module comprises a temperature and humidity measuring circuit which is connected with the microcontroller through an analog-to-digital converter or a bus interface.
The illumination intensity measuring module comprises an illumination intensity measuring circuit which is connected with the microcontroller through an analog-to-digital converter or a bus interface.
The moisture transmission parameter measuring module comprises two paths of pressure sensors, is connected with the microcontroller through an analog-to-digital converter or a bus interface, and supports any one of a potted plant weighing method and a communicating vessel method.
The data transmission unit comprises a mobile network access circuit electrically connected with the control unit, can be connected with a remote server or a terminal through a mobile network, and performs bidirectional communication.
The time service unit comprises an NTP server access circuit electrically connected with the control unit, can be connected with the NTP server through a mobile network, acquires a standard clock and adds timestamp information for data acquired by the data sensing unit.
The function configuration unit comprises a communication interface electrically connected with the control unit, can receive a function configuration instruction input by a user, and transmits the function configuration instruction to the control unit. The functional configuration instructions comprise a data sampling trigger mode instruction, a sampling period instruction, a moisture transmission parameter measuring method selecting instruction and a pressure sensor selecting instruction, and are used for specifying a data sampling trigger mode, a sampling period, a moisture transmission parameter measuring method and a used pressure sensor. The sampling trigger mode comprises 2 modes of a fixed period mode and a pressure trigger mode. The fixed period mode is that the data sensing unit samples data at fixed time intervals, wherein the time intervals are determined by sampling period instructions; the pressure trigger mode is that when the output value of any one path of pressure sensor changes, the data sensing unit immediately completes one-time data sampling. The water transmission parameter measuring method comprises a potted plant weighing method and a communicating vessel method. When a potted plant weighing method is used, any path of pressure sensor can be selected.
The system state output unit comprises a communication interface electrically connected with the control unit and can output the system state code programmed by the control unit to a user.
The expansion unit comprises a general I/O port of the microcontroller, an analog-to-digital converter interface, an I2C interface, an SPI interface and a UART interface.
The power supply unit comprises a 5.0V power supply, a 1 st path of 3.3V power supply and a2 nd path of 3.3V power supply. The 2 nd 3.3V power supply is a controllable power supply and can be controlled to be turned on or turned off by the control unit. The 5.0V power supply supplies power for the data transmission unit and the time service unit; the 1 st path of 3.3V power supply supplies power for the control unit, the function configuration unit and the system state output unit; and the 2 nd path of 3.3V power supply supplies power for the data sensing unit and the expansion unit.
As shown in FIG. 1, the invention provides a data acquisition device for researching the relationship between plant bioelectricity and water transmission parameters, which comprises a control unit, a data sensing unit, a data transmission unit, a time service unit, a function configuration unit, a system state output unit, an expansion unit and a power supply unit. The control unit is electrically connected with the data sensing unit, the data transmission unit, the time service unit, the function configuration unit, the system state output unit, the expansion unit and the power supply unit, and is used for analyzing user instructions, processing data and controlling each unit to work normally; the data sensing unit is used for collecting data and transmitting the data to the control unit for processing; the data transmission unit is used for transmitting data to a remote server or a terminal; the time service unit is used for connecting the NTP server, acquiring a standard clock and adding timestamp information to the data acquired by the data sensing unit; the function configuration unit is used for receiving a function configuration instruction input by a user and transmitting the function configuration instruction to the control unit; the system state output unit is used for outputting system state information for system maintenance; the expansion unit is used for leading out a universal digital I/O port, an analog-to-digital converter interface, an I2C interface, an SPI interface and a UART interface for the use of expanding system functions; the power supply unit is used for supplying power to the control unit, the data sensing unit, the data transmission unit, the time service unit, the function configuration unit, the system state output unit and the expansion unit.
As shown in fig. 2(a), the control unit includes a microcontroller MSP430F147 and a peripheral circuit thereof, and is electrically connected to the data sensing unit, the data transmission unit, the time service unit, the function configuration unit, the system state output unit, the expansion unit, and the power supply unit.
As shown in fig. 2(b), the data sensing unit includes a power monitoring module, a bioelectric signal measuring module, an environment temperature and humidity measuring module, a soil temperature and humidity measuring module, an illumination intensity measuring module, and a moisture transmission parameter measuring module.
The power supply monitoring module: the resistors RS12 and RS13 form a power supply voltage sampling circuit, and the output voltage of the power supply voltage sampling circuit is 1/6 of the power supply voltage; the integrated operational amplifier UO1A and the resistor RS11 form a voltage follower for impedance conversion, the output signal of which is received by the control unit via an analog-to-digital converter. The integrated operational amplifier is model OPA 2333.
The bioelectrical signal measuring module: BIO-VOLTAGE is a three-way bioelectrical signal interface; the integrated operational amplifiers UO1B, UO2A and UO2B, and surrounding resistors and capacitors form a three-way same-proportion amplifier and a three-way low-pass filter for signal conditioning, and output signals of the three-way same-proportion amplifier and the three-way low-pass filter are received by the control unit through the analog-to-digital converter. The integrated operational amplifier is model OPA 2333.
Environment humiture measurement module: sensor BME280, with surrounding resistors and capacitors, form a temperature and humidity measurement circuit, which transmits the measured values to the control unit via I2C bus or SPI bus. In addition, the module can also measure atmospheric pressure.
Soil temperature and humidity measurement module: including the temperature and humidity sensor interface SOIL, transmit the measured values to the control unit via the I2C bus. The temperature and humidity sensor can select any one of SHT10, SHT11 and SHT15, and is subjected to waterproof treatment.
The illumination intensity measuring module: comprises a photosensitive resistor RL1 and a signal conditioning circuit (a resistor RL2 and a capacitor CL1), and the output signals of the photosensitive resistor RL1 are received by the control unit through an analog-to-digital converter.
Moisture transmission parameter measurement module: comprises two pressure sensors with HX711, which respectively transmit the measured values to a control unit via a single bus. Is suitable for potted plant weighing method and communicating vessel method. When a potted plant weighing method is used, any path of pressure sensor can be selected.
As shown in fig. 2(c), the data transmission unit includes a SIM800C (UG) and its peripheral circuits, and is connected to the control unit via a UART interface. The control unit controls the SIM800C to turn on and off, switch the operation mode, connect or disconnect a remote server or terminal, and transmit data through AT commands. The basic flow of one data transmission is shown in table 1.
Table 1 data transmission flow
Figure BDA0002400850040000101
Figure BDA0002400850040000111
As shown in fig. 2(c), the time service unit and the data transmission unit share hardware resources, including the SIM800C (UG) and its peripheral circuits, and are connected to the control unit through a UART interface. The control unit controls SIM800C to connect to the NTP server through an AT command, and acquires a standard clock. The standard clock is used to add time stamp information to the data. The basic timing flow is shown in table 2.
TABLE 2 time service flow
Figure BDA0002400850040000112
As shown in fig. 2(d), the functional configuration unit includes a UART interface, which is connected to the UART1 of the microcontroller MSP430F 147. The function configuration unit can receive function configuration instructions input by a user, and the instructions are received and processed by the microcontroller. The functional configuration instruction is used for specifying a data sampling trigger mode, a sampling period, a moisture transmission parameter measuring method and a used pressure sensor, and a user can input the instruction through a serial port tool. The functional configuration instruction is a 16-bit binary number and comprises a data sampling trigger mode instruction, a sampling period instruction, a moisture transmission parameter measurement method selection instruction and a pressure sensor selection instruction 4. Wherein, the 0 th to 5 th bits are sampling period instructions, the 6 th to 7 th bits are data sampling trigger mode instructions, the 8 th to 13 th bits are pressure sensor selection instructions, and the 14 th to 15 th bits are moisture transmission parameter measurement method selection instructions, as shown in fig. 5. The data sampling trigger mode comprises 2 modes of a fixed period mode and a pressure trigger mode. The fixed period mode is that the data sensing unit samples data at fixed time intervals, wherein the time intervals are determined by sampling period instructions; the pressure trigger mode is that when the output value of any one path of pressure sensor changes, the data sensing unit immediately completes one-time data sampling. The water transmission parameter measuring method comprises a potted plant weighing method and a communicating vessel method. When a potted plant weighing method is used, any path of pressure sensor can be selected; when the communicating vessel method is used, two paths of pressure sensors need to be selected simultaneously. The function allocation method is shown in tables 3 and 4.
TABLE 3 function configuration method (function configuration instruction low 8 bit)
Figure BDA0002400850040000121
TABLE 4 function configuration method (function configuration instruction high 8 bit)
Figure BDA0002400850040000122
As shown in fig. 2(d), the system status output unit and the function configuration unit share hardware resources, including a UART interface, and are connected to the UART1 of the microcontroller MSP430F 147. The control unit compiles and outputs information according to the system state, and a user can read the information through a serial port tool, as shown in fig. 6.
As shown in fig. 2(e), the expansion unit includes an analog-to-digital converter interface, a UART interface, and a part of I/O port of the microcontroller MSP430F147, and each interface can be multiplexed as an I2C interface and an SPI interface. The expansion unit may be used to expand system functionality.
As shown in fig. 2(f), the POWER supply unit includes a POWER interface (POWER), a 5.0V POWER supply, a 1 st 3.3V POWER supply (VCC), and a2 nd 3.3V POWER supply. The 5.0V power supply comprises a switch type voltage stabilizer LM2576-5.0 and a peripheral circuit thereof, can provide 5.0V/3A output and supplies power for the data transmission unit and the time service unit; the 1 st path of 3.3V power supply comprises a low dropout linear regulator MIC5219-3.3 and an external circuit thereof, can provide 3.3V/500mA output and supplies power for the control unit, the function configuration unit and the system state output unit; the 2 nd 3.3V power supply comprises a low dropout linear regulator MIC5219-3.3 and an external circuit thereof, can provide 3.3V/500mA output and supplies power for the data sensing unit and the expansion unit. The 2 nd 3.3V power supply is controlled by the control unit through the EN pin of the MIC5219-3.3, and is turned on when the EN pin is pulled high and is turned off otherwise.
Fig. 7 is a system workflow. After the device is started, system initialization is firstly carried out, and the device comprises a common input/output interface of a microcontroller, an asynchronous receiving/transmitting transmitter, a timer, an analog-to-digital converter and an interrupt. The GPRS module SIM800C is then activated. And after the GPRS module is successfully started, performing clock synchronization with the NTP server. Then reading the function configuration instruction and turning on the 2 nd 3.3V power supply. And then acquiring an NTP standard clock to obtain data acquisition time and finish one-time data acquisition, wherein the data acquisition time comprises power supply voltage, a bioelectricity signal, environment temperature and humidity, soil temperature and humidity and illumination intensity. And finally, formatting the data and sending the data to a remote server or a terminal. Then, if the system is set to be in a fixed period mode, entering a dormant state, starting a timer and preparing to enter the next working period; otherwise, monitoring whether the output value of the pressure sensor changes or not, and preparing to enter the next working period. All the links are output with system state information.
It should be emphasized that the examples described herein are illustrative and not restrictive, and thus the present invention includes, but is not limited to, those examples described in this detailed description, as well as other embodiments that can be derived from the teachings of the present invention by those skilled in the art and that are within the scope of the present invention.

Claims (8)

1. The utility model provides a plant bioelectricity and moisture transmission parameter's data acquisition device which characterized in that: the system comprises a control unit, a data sensing unit, a data transmission unit, a time service unit, a function configuration unit, a system state output unit, an expansion unit and a power supply unit;
the input end of the control unit is connected with the data sensing unit and used for receiving detection data acquired by the data sensing unit in real time; the control unit is also connected with a remote server or a terminal through a data transmission unit and carries out bidirectional communication; the input end of the control unit is also connected with the time service unit and is used for adding timestamp information to the data acquired by the data sensing unit; the input end of the control unit is also connected with the function configuration unit and used for receiving a function configuration instruction input by a user; the output end of the control unit is also connected with a system state output unit and used for outputting a system state code compiled by the control unit to a user; the output end of the control unit is also connected with the expansion unit and is used for being connected with external equipment; the output end of the power supply unit is respectively connected with the control unit, the data sensing unit, the data transmission unit, the time service unit, the function configuration unit, the system state output unit and the extension unit and supplies power to the control unit, the data sensing unit, the data transmission unit, the time service unit, the function configuration unit, the system state output unit and the extension unit.
2. The plant bioelectricity and moisture transmission parameter data collection device of claim 1, wherein: the control unit comprises a microcontroller and an analog-to-digital converter; the data sensing unit comprises a power supply monitoring module, a bioelectric signal measuring module, an environment temperature and humidity measuring module, a soil temperature and humidity measuring module, an illumination intensity measuring module and a moisture transmission parameter measuring module;
the power supply monitoring module comprises a power supply voltage sampling circuit and an impedance conversion circuit which are connected together, and the output end of the power supply monitoring module is connected with the microcontroller through an analog-to-digital converter and used for monitoring the power supply voltage;
the bioelectrical signal measuring module comprises a plurality of bioelectrical signal interfaces, an amplifier and a low-pass filter which are connected together, wherein the output end of the bioelectrical signal measuring module is connected with the microcontroller through an analog-to-digital converter and is used for acquiring the potential difference between any point of the plant stem and the soil or the potential difference between any two points of the plant stem in the longitudinal direction, and outputting the potential difference to the microcontroller after analog-to-digital conversion;
the environment temperature and humidity measuring module comprises a temperature and humidity measuring circuit, wherein the output end of the temperature and humidity measuring circuit is connected with the microcontroller through an analog-to-digital converter or a bus interface and is used for collecting the environment temperature and humidity;
the soil temperature and humidity measuring module comprises a temperature and humidity measuring circuit, wherein the output end of the temperature and humidity measuring circuit is connected with the microcontroller through an analog-to-digital converter or a bus interface and is used for collecting the temperature and humidity of soil;
the illumination intensity measuring module comprises an illumination intensity measuring circuit, the output end of the illumination intensity measuring circuit is connected with the microcontroller through an analog-to-digital converter or a bus interface and is used for collecting illumination intensity;
the moisture transmission parameter measuring module comprises two paths of pressure sensors, and the output ends of the two paths of pressure sensors are connected with the microcontroller through an analog-to-digital converter or a bus interface and used for measuring moisture transmission parameters.
3. The plant bioelectricity and moisture transmission parameter data collection device according to claim 1 or 2, wherein: the data transmission unit is connected with the control unit, comprises a mobile network access circuit electrically connected with the control unit, can be connected with a remote server or a terminal through a mobile network, and performs bidirectional communication.
4. The plant bioelectricity and moisture transmission parameter data collection device according to claim 1 or 2, wherein: the output end of the time service unit is connected with the control unit, the time service unit comprises an NTP server access circuit electrically connected with the control unit, the NTP server can be connected through a mobile network, a standard clock is obtained, and timestamp information is added to data obtained by the data sensing unit.
5. The plant bioelectricity and moisture transmission parameter data collection device according to claim 1 or 2, wherein: the function configuration unit comprises a communication interface electrically connected with the control unit, the output end of the function configuration unit is connected with the control unit, and the function configuration unit is used for outputting a data sampling trigger mode instruction, a sampling period instruction, a moisture transmission parameter measurement method selection instruction and a pressure sensor selection instruction which are input by a user to the control unit.
6. The plant bioelectricity and moisture transmission parameter data collection device according to claim 1 or 2, wherein: the system state output unit comprises a communication interface electrically connected with the control unit, and the input end of the system state output unit is connected with the control unit and used for outputting the system state code compiled by the control unit to a user.
7. The plant bioelectricity and moisture transmission parameter data collection device according to claim 1 or 2, wherein: the expansion unit comprises a general I/O port of the microcontroller, an analog-to-digital converter interface, an I2C interface, an SPI interface and a UART interface and is used for being connected with external equipment.
8. The plant bioelectricity and moisture transmission parameter data collection device according to claim 1 or 2, wherein: the power supply unit comprises a 5.0V power supply, a first path of 3.3V power supply and a second path of 3.3V power supply; the 5.0V power supply supplies power to the data transmission unit and the time service unit; the first path of 3.3V power supply supplies power for the control unit, the function configuration unit and the system state output unit; the second path of 3.3V power supply is a controllable power supply, the control unit controls the second path of 3.3V power supply to be turned on or turned off, and the second path of 3.3V power supply supplies power for the data sensing unit and the expansion unit.
CN202010146285.5A 2020-03-05 2020-03-05 Data acquisition device for plant bioelectricity and moisture transmission parameters Pending CN111174833A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111638306A (en) * 2020-06-11 2020-09-08 中国农业科学院农业信息研究所 Crop dynamic monitoring method, device, equipment and system
CN111930055A (en) * 2020-09-29 2020-11-13 国网（天津）综合能源服务有限公司 Comprehensive energy sensing device with optimized control
WO2022021539A1 (en) * 2020-07-27 2022-02-03 安徽华速达电子科技有限公司 Intelligent control methods for solution microparticle signal collection, device and server

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111638306A (en) * 2020-06-11 2020-09-08 中国农业科学院农业信息研究所 Crop dynamic monitoring method, device, equipment and system
CN111638306B (en) * 2020-06-11 2022-05-17 中国农业科学院农业信息研究所 Crop dynamic monitoring method, device, equipment and system
WO2022021539A1 (en) * 2020-07-27 2022-02-03 安徽华速达电子科技有限公司 Intelligent control methods for solution microparticle signal collection, device and server
CN111930055A (en) * 2020-09-29 2020-11-13 国网（天津）综合能源服务有限公司 Comprehensive energy sensing device with optimized control
CN111930055B (en) * 2020-09-29 2021-01-15 国网（天津）综合能源服务有限公司 Comprehensive energy sensing device with optimized control

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