The Design Of Plant Electrical Measurement System Based On RFID

Plants and plant physiological processes electrical signal is transmitted signals and body are closely related to the main physiological signal in plants to environmental change, response to stimuli. As the signal is reflected in plant growth and physiological status information on an important signal, it can be used as greenhouse production control temperature, humidity and other environmental factors as a reference. Optimal control of environmental factors, can make the best plant growth conditions, in turn, can increase crop yield. Therefore, the monitoring and analysis of plant signal to commence the study, the facility will agricultural technology, agriculture, information technology and precision agriculture technology research and promotion have an important role.This integrated use of analog electronics, microcontroller programming, serial communications technology, radio frequency technology, VB programming, database technology, sensor technology, designed a real-time monitoring of plant electrical systems. The design of the system with real-time, high accuracy, immunity to interference and enables remote measurements, the characteristics of distributed measurement points. Research papers, mainly from the status quo, development trends, overall system design, hardware design, software design, and research summary of the five areas as discussed.First analyzes the current situation and the subject of international research status of domestic research, described in detail the international and domestic research on the history of electrical plants, research, etc., and analyzes trends in the study of plant signals. In the analysis of this subject research status and development trend, based on the proposed system’s overall design. Then a detailed analysis of each system’s hardware design and software design solutions, and proposed hardware and software design process anti-interference measures.In the overall design, the details of the system’s overall function, and describes the system modules and the composition of modules. System consists of a number of RFID tags, readers and terminals and PC into a host body, the electronic tag and reader to form a wireless sensor network. Tag main achievement of the plant collection and send electrical signals, terminal tag reader receives all the data sent from the information and the information sent to the PC via the serial PC, PC to PC can be observed on the label measured in all power plants signal voltage magnitude and real-time dynamic curve.In the hardware design described in detail the working principle of each module, the module chips used in the selection and the characteristics of the selected chip, and describes the various modules of the circuit diagram and software simulation diagram. Has introduced the signal acquisition module, ADC module, controller module, RF transceiver modules, system power supply module, serial communication module and LCD module8module works, chip selection, circuit and functional simulation.Among them, the signal acquisition module details which preamplifier circuit, a notch circuit, low-pass filter circuit, the secondary amplifier and the final stage amplifier circuit used in the integrated operational amplifier op amp selection and selected characteristics and resistance. Capacitance parameters.Described in the software design of electronic tag chip and reader in the main program flow chart of the microcontroller, and the subroutine flow chart, PC PC program design. First introduced the electronic tag chip design process and the main A/D sampling routine design process. Then introduced the reader in the design process and the main microcontroller serial communication subroutine process, and details of the RF transceiver chip NRF24L01programming design. Finally, details of the PC host computer programming options, including the interface and form design program interface form associated with the database design, and details of the interface design of form controls in the use of the role and characteristics.In the system simulation and experimental part of the use of the electronic circuit software circuit system module effect simulation test, from circuit simulation result, the function module circuit basic can comply with the design requirements. In the measurement of the three plants were selected to test, and record the plant electrical signal numerical and describes the general signal waveform.Finally the testing system was made a brief summary. It points out the shortcomings and the direction about how to adjust and improve aftertime.