CN202677142U - Feedback control interface for trickle irrigation facility based on facility agriculture sensor network - Google Patents
Feedback control interface for trickle irrigation facility based on facility agriculture sensor network Download PDFInfo
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- CN202677142U CN202677142U CN 201120357253 CN201120357253U CN202677142U CN 202677142 U CN202677142 U CN 202677142U CN 201120357253 CN201120357253 CN 201120357253 CN 201120357253 U CN201120357253 U CN 201120357253U CN 202677142 U CN202677142 U CN 202677142U
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- chip microcomputer
- feedback control
- control interface
- serial ports
- current transducer
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Abstract
The utility model relates to a feedback control interface for a trickle irrigation facility. The feedback control interface is composed of a single chip microcomputer (1), an AD421 current transmitter (2), an RS232 serial port (3), a peripheral crystal oscillator (4), a MAX232 (5), an optoelectronic isolator (6) and an electromagnetic valve (7), wherein the RS232 serial port (3), the peripheral crystal oscillator (4) and the MAX232 (5) are connected with the single chip microcomputer (1), the AD421 current transmitter (2) is connected with the single chip microcomputer (1) by the optoelectronic isolator (6) through the RS232 serial port (3), and the electromagnetic valve (7) is connected with the AD421 current transmitter (2) through the RS232 serial port (3).
Description
Technical field
The utility model relates to a kind of drip irrigation facility FEEDBACK CONTROL interface based on the industrialized agriculture sensor network, comprises a STC single-chip microcomputer and an AD421 current transducer.Be particularly useful for the adjusting control to solenoid valve.
Background technology
Great majority are made feedback after the PC end is processed by the sensing network Information Monitoring in industrialized agriculture at present, can not the meet the demands demand of Automation of Agricultural Production of the device such as manual adjustments drip irrigation equipment then, this manual control mode.And manual control mode is difficult to better hold the size of discharge.Given this, the industrialized agriculture automatic control technology is arisen at the historic moment, and can realize the robotization of agricultural production, and this technology is comparatively ripe abroad, and forward is increasingly automated, the intelligent direction development, is applied to fertilising, the irrigation of crops.The internal and overseas gap is larger, and the Automation of Agricultural Production degree is low, and technology is deficient.
AD421 is that a complete loop service type 4mA～20mA counts electric transducer, is widely used in industrial control field.High precision, low cost adopts compact 16 pin package.But AD421 combined standard HART FSK protocol communication circuit uses, and rated performance is unaffected.Its HSSI High-Speed Serial Interface can be worked with 10Mbps speed, and permission is that serial line interface simply links to each other with microcontroller with the microprocessor of commonly using by standard three lines.
The utility model content
The purpose of this utility model is the robotization that realizes the control of drip irrigation facility.To achieve these goals, the utility model proposes a kind of drip irrigation facility FEEDBACK CONTROL interface based on the industrialized agriculture sensor network--a kind of drip irrigation facility FEEDBACK CONTROL interface that digital signal can be converted into simulating signal.Send order--digital signal by the RS232 serial ports to the STC51 single-chip microcomputer, this interface is converted into simulating signal with these digital signals, then sends solenoid valve to, thereby realizes the robotization to the control of drip irrigation facility.
The utility model for achieving the above object, the technical scheme of taking is: a kind of drip irrigation facility FEEDBACK CONTROL interface is comprised of single-chip microcomputer (1), AD421 current transducer (2), RS232 serial ports (3), peripheral crystal oscillator (4), MAX232 (5), photoisolator (6) and solenoid valve (7).RS232 serial ports (3), peripheral crystal oscillator (4), MAX232 (5) link to each other with single-chip microcomputer (1), current transducer (2) links to each other with single-chip microcomputer (1) with photoisolator (6) by serial ports, and solenoid valve (7) links to each other with current transducer (2) by serial ports.At first, input the one tunnel data that represent relay switch or digital regulation resistance size of current by serial ports to single-chip microcomputer by host computer.Single-chip microcomputer directly writes data in the AD421 current transducer by 3-line serial interface.Automatically finish the output of the simulating signal of 4-20mA electric current by hardware, simulating signal is flowed to solenoid valve, the electromagnetic valve switch size is positioned.Data are larger, and simulating signal is larger, and electromagnetic valve switch is larger, and discharge is also just larger.So just can realize the robotization control to drip irrigation equipment discharge size.
The beneficial effects of the utility model are, the data of the representative discharge size that serial ports can be transmitted, be converted into the simulating signal of control electromagnetic valve switch size, thereby can control fast and effectively the size of discharge, realize the robotization control of drip irrigation equipment, and simple in structure, antijamming capability is strong.And AD421 4～20mA electric current output DAC has the precision height, and low in energy consumption, peripheral cell is few, with advantages such as the MCU interface are simple.
Can adopt the loop power supply mode, and can be peripheral circuit working power and reference power source are provided, consist of two-wire system 4～20mA transmitter with the MCU of low-power consumption, be that device is sent in more satisfactory intelligent electric rheology.
Description of drawings
Concrete structure of the present utility model is provided by following embodiment and accompanying drawing thereof.Fig. 1 is the circuit diagram that AD421 and single-chip microcomputer adopt 3-line serial interface.Fig. 2 is the oscillogram of the 3-line serial interface of AD421 and microcontroller.Fig. 3 is the sequential chart of the 3-line serial interface of AD421 and microcontroller.
Embodiment
Describe details and working condition according to the concrete device that the utility model proposes in detail below in conjunction with Fig. 1.
Hardware: AD421 is connected the employing 3-line serial interface with single-chip microcomputer, as shown in Figure 1, connecing the external buffer circuit that connects a resistance and electric capacity composition between an electric capacity, DRIVE and the COM pin, the backfeed loop that consists of to stablize internal regulator work amplifier and external transistor between COMP and the DRIVE.Adjusting Voltage-output Vcc is+3V.The electric current that is provided by external world's adjustment pipe 2SK30A is less, so used NPN type triode directly to obtain 4～20mA electric current from current supply circuit.For satisfying in the signals transmission the requirement of the aspects such as noise, security and distance, DATA, CLOCK are connected photoisolator and are connected with the serial port of MCU with LATCH.
Software: when the program design of the AD421 that realizes the output of 4～20mA electric current, P1.0 mouth, P1.1 mouth and P1.2 mouth by single-chip microcomputer directly write data to LATCH, CLOCK and DATA end, rising edge at the CLOCK signal, data are pressed the order of big-endian, be loaded onto the input shift register of AD421 inside, at the rising edge of LATCH signal, the data of input shift register are sent to DAC and latch end.Automatically finished the output of 4～20mA electric current by hardware.The sequential chart of serial line interface as shown in Figure 2.Code is as follows:
Claims (4)
1. drip irrigation facility FEEDBACK CONTROL interface, by single-chip microcomputer (1), AD421 current transducer (2), RS232 serial ports (3), peripheral crystal oscillator (4), MAX232 (5), photoisolator (6) and solenoid valve (7) form, it is characterized in that, RS232 serial ports (3), peripheral crystal oscillator (4), MAX232 (5) links to each other with single-chip microcomputer (1), current transducer (2) links to each other with single-chip microcomputer (1) with photoisolator (6) by serial ports, and solenoid valve (7) links to each other with current transducer (2) by serial ports.
2. the drip irrigation facility FEEDBACK CONTROL interface under according to claim 1, it is characterized in that, RS232 serial ports (3), peripheral crystal oscillator (4), MAX232 (5) are connected with single-chip microcomputer (1), and host computer is sent to single-chip microcomputer by RS232 serial ports (3) with digital signal.
3. the drip irrigation facility FEEDBACK CONTROL interface under according to claim 1, it is characterized in that, AD421 current transducer (2) is connected the employing 3-line serial interface with single-chip microcomputer (1), connecing the external buffer circuit that connects a resistance and electric capacity composition between an electric capacity, DRIVE and the COM pin between COMP and the DRIVE, adjustment Voltage-output Vcc is+3V; Having used NPN type triode directly to obtain 4～20mA electric current DATA, CLOCK from current supply circuit is connected photoisolator (6) and is connected with the serial port of single-chip microcomputer (1) with LATCH.
4. the drip irrigation facility FEEDBACK CONTROL interface under according to claim 1 is characterized in that current transducer (2) links to each other with solenoid valve (7), and current transducer is converted into simulating signal with the digital signal that receives, and simulating signal is sent to solenoid valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120357253 CN202677142U (en) | 2011-09-14 | 2011-09-14 | Feedback control interface for trickle irrigation facility based on facility agriculture sensor network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120357253 CN202677142U (en) | 2011-09-14 | 2011-09-14 | Feedback control interface for trickle irrigation facility based on facility agriculture sensor network |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202677142U true CN202677142U (en) | 2013-01-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120357253 Expired - Fee Related CN202677142U (en) | 2011-09-14 | 2011-09-14 | Feedback control interface for trickle irrigation facility based on facility agriculture sensor network |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202677142U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113128765A (en) * | 2021-04-20 | 2021-07-16 | 南京理工大学 | Accurate regulation and control technology based on crop monitoring model and internet of things data |
-
2011
- 2011-09-14 CN CN 201120357253 patent/CN202677142U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113128765A (en) * | 2021-04-20 | 2021-07-16 | 南京理工大学 | Accurate regulation and control technology based on crop monitoring model and internet of things data |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130116 Termination date: 20130914 |