CN111750767A

CN111750767A - Plant height wireless sensor network monitoring device

Info

Publication number: CN111750767A
Application number: CN201910415994.6A
Authority: CN
Inventors: 王七斤; 李志伟; 句钰钊; 王嘉伟; 王璨; 李晋蒲; 高安琪; 韦玉翡
Original assignee: Shanxi Agricultural University
Current assignee: Shanxi Agricultural University
Priority date: 2019-05-19
Filing date: 2019-05-19
Publication date: 2020-10-09

Abstract

The invention discloses a plant height wireless sensing network monitoring device which comprises a spiral spring, a wheel disc, a fixed shaft, a support, a fine wire, a wire fixing support, a conical rod and a multi-turn potentiometer. During the measurement with the support insert in the ground, it is fixed with the plant top of awaiting measuring to draw fine rule one end, the potentiometre meets with the AD passageway pin of gathering the node circuit, the power of plant ascending growth rotates through the fine rule pulling rim plate and drives the potentiometre and rotate together, change the height information of plant into voltage signal, the information of gathering is through gathering the LORA module wireless transmission on the node to the gateway, the gateway sends the cloud platform with data through the 4G network, at last, the demonstration storage is held at long-range PC.

Description

Plant height wireless sensor network monitoring device

Technical Field

The invention relates to the field of facility agricultural engineering, in particular to an intelligent monitoring device for a wireless sensor network for the height of crop plants.

Background

In the cultivation of crops in protected agriculture, the growth condition of crop plants needs to be accurately mastered, so that irrigation, fertilization, deinsectization and the like of the crops can be more efficiently and accurately guided. The traditional agricultural production relies on the experience of growers to judge and estimate the growth of crops, the accuracy of the obtained information is different and inaccurate, and the agricultural production mode can not meet the requirements of modern facility agriculture on the scientificity, accuracy, intelligence and high efficiency of agricultural production. The height of the planted crops is an important index for representing the growth condition of the crops.

People are mostly for measuring slide bar, dipperstick, infrared distance meter etc. to the measuring device of plant height in the facility green house at present, and it is highly limited to measure slide bar, dipperstick measurement, and the mode tradition falls behind, and the accuracy is not high, and infrared distance meter cost is higher, receives environmental impact big. And the diameter real-time data information obtained by the various modes cannot be remotely transmitted through a wireless network, and the real-time on-line monitoring of the stalk growth information cannot be realized.

Disclosure of Invention

Based on the existing problems, the invention provides a crop plant height wireless sensor network intelligent monitoring device based on a multi-circle precision potentiometer, which converts the variable quantity of the increase of the height of a crop plant into a voltage signal for measurement and can remotely transmit the acquired information through a wireless transmission network.

In order to achieve the purpose, the invention adopts the following technical scheme: the utility model provides a plant height wireless sensor network monitoring devices which characterized in that: the plant height measuring sensor comprises a spiral spring, a wheel disc, a fixed shaft, a support, a fine wire, a fixed wire support, a conical rod and a multi-turn potentiometer.

Furthermore, the diameter of the wheel disc is 15cm, the width of the wheel disc is 1cm, grooves are formed in the edges of the wheel disc, the depth of each groove is 0.5cm, a circular cavity is designed in the center of the wheel disc, the diameter of each cavity is 4cm, a hole is formed in the original point position of the wheel disc, the wheel disc is sleeved on the fixed shaft, and the wheel disc can rotate around the fixed shaft.

Furthermore, one end of the fixed shaft is fixed on the support plate, and a groove is formed in the shaft end.

Furthermore, the spiral spring is placed in a cavity in the center of the wheel disc, one end of the spiral spring is fixed with the wall of the cavity, and the other end of the spiral spring is inserted into and fixed in a groove at the shaft end of the fixed shaft.

Furthermore, the fine line with good toughness is evenly wound on the groove at the edge of the wheel disc, one end of the fine line is fixed on the edge of the wheel disc, and the other end of the fine line penetrates out of the line outlet hole of the line fixing support.

Furthermore, two ends of the wire fixing support are fixed on the support plate, the plane where the wire fixing support is located is perpendicular to the plane where the wheel disc is located, and a circular wire outlet hole is formed in the position, opposite to the groove of the wheel disc, of the wire fixing support.

Furthermore, the mechanical stroke of the multi-ring potentiometer is 10 rings, the multi-ring potentiometer is high-precision, the fixed shaft of the multi-ring potentiometer is fixed on the wall of the support, and the rotating shaft is fixed in the cylindrical groove in the central surface of the wheel disc.

Further, a pair of tapered rods is fixed to the bottom end of the bracket.

Further, the conversion common between the AD value corresponding to the collected plant height variation value and the plant height value is: y is 0.08x + 29.474

Wherein the value x is the AD value corresponding to the collected plant height variation value, and the value y is the plant height value.

Further, the plant height measuring sensor is connected to a collecting node in the intelligent greenhouse monitoring system, plant height information is collected through a collecting circuit, and a wireless data transmission module on the collecting node sends data to the gateway and the cloud platform and the remote server through the 4G network.

Compared with the prior art, the invention has the following beneficial effects: the invention is based on a multi-turn potentiometer, and utilizes the upward growth force of plants to drive the wheel disc to rotate, so that the rotating shaft of the multi-turn potentiometer rotates, the variation of the height increase of the plants of the crops is converted into a voltage signal to be measured, and the diameter of the wheel disc is larger, and the spiral spring is a light spring, so the force required for pulling the wheel disc is very small, the growth of the plants cannot be influenced, and the device has light weight and high measurement precision.

Height data information acquired by the plant height measuring sensor can be transmitted to the gateway through the LORA data transmission module on the acquisition node, transmitted to the cloud platform through the 4G network, and finally displayed and stored at the remote server end, so that the plant height information can be remotely monitored on line in real time.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a front cross-sectional view of the present invention;

FIG. 3 is a side view of the present invention;

FIG. 4 is a top view of the present invention;

fig. 5 is a system configuration diagram of the present invention.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

The plant height measuring sensor shown in the figures I to IV comprises a spiral clockwork spring (8), a wheel disc (1), a fixed shaft (7), a support (2), a fine wire (5), a fixed wire support (3), a conical rod (6) and a multi-turn potentiometer (4).

The diameter of the wheel disc (1) is 15cm, the width of the wheel disc is 1cm, grooves are formed in the edges of the wheel disc, the depth of each groove is 0.5cm, a circular cavity is designed in the center of the wheel disc (1), the diameter of the cavity is 4cm, the wheel disc is provided with a hole in the original point position and sleeved on the fixed shaft (7) and can rotate around the fixed shaft (7), one end of the fixed shaft (7) is fixed on the support plate (22), and a groove is formed in the shaft end (7).

The spiral clockwork spring (8) is placed in a cavity in the center of the wheel disc, one end of the spiral clockwork spring is fixed with the wall of the cavity, and the other end of the spiral clockwork spring is inserted into a groove of a shaft end (7) of the fixed shaft and fixed, so that when the wheel disc (1) rotates slowly, the spiral clockwork spring (8) can be tightened to generate resilience force in the direction opposite to the rotation direction of the wheel disc (1).

Fine lines (5) with good toughness are uniformly wound on grooves in the edge of the wheel disc (1), one ends of the fine lines (5) are fixed on the edge of the wheel disc (1), and the other ends of the fine lines penetrate out of wire outlet holes of the wire fixing support (3). Can drive rim plate (1) through pulling fine rule (1) and rotate together, when the rim plate rotated, the resilience force that spiral clockwork spring (8) produced and rim plate (1) rotation opposite direction just can make fine rule (5) be in the state of tautness all the time, just so can ensure can not make fine rule (5) relax because of other external force interference in measurement process, perhaps the condition emergence of influence measurement accuracy such as rim plate (1) gyration.

The pulling end of the thin wire (5) penetrates out of the wire outlet hole of the wire fixing support (3), the wire fixing support (3) can enable the thin wire (5) to be smoother in the pulling and lifting wire outlet process, and the phenomenon that the thin wire (5) falls off from the wheel disc (1) or is twisted when the wire is outlet does not occur.

The mechanical stroke of the multi-turn potentiometer (4) is 10 turns, the high-precision multi-turn potentiometer (4) is adopted, a fixed shaft of the multi-turn potentiometer (4) is fixed on a support wall (21), a rotating shaft is fixed in a cylindrical groove (11) on the central surface of the wheel disc, a thin wire (5) is pulled to drive the wheel disc (1) to rotate, the wheel disc (1) further drives the rotating shaft of the multi-turn potentiometer (4) to rotate together, the height change of a plant is converted into a voltage signal, the spiral spring (8) is a light spring, the diameter of the wheel disc (1) is designed to be larger, the damping is small when the rotating shaft of the multi-turn potentiometer (4) rotates, the force required by the thin wire (5) for driving the rotating shaft of the multi-turn potentiometer (4) to rotate through the whole device is small, the whole design meets the condition that the thin wire (5) is tightened under the action of the spiral spring (8), and the wheel disc (1, and the growth of the plants cannot be influenced due to too large tension.

When measuring the plant height, insert the device in the ground and fix, pull out partly fine rule (5), the top of the end of rising and the plant that awaits measuring of fine rule (5) is fixed together, the plant will stimulate fine rule (5) upward movement at the growth in-process like this, fine rule (5) stimulate rim plate (1) slow rotation, fine rule (1) are in the state of straining under spiral clockwork spring (8) effect simultaneously, can not make the rim plate gyration, rim plate (1) slow rotation drives the rotation axis of many rings of potentiometre (4) and rotates together, just so can transmit the high information that changes for the data acquisition circuit of node acquisition system with the form of signal of telecommunication.

The data acquisition circuit acquires the AD value of the altitude change information, and a mathematical conversion formula of the AD value of the altitude change information and the plant height is fitted by establishing a mathematical model:

y＝0.08x＋29.474

The maximum measurement height of the device is 471cm according to the calculation of the wheel disc perimeter and the mechanical stroke of the potentiometer, and the device can meet the measurement requirement in a facility agricultural greenhouse.

The conversion formula is written into a program of the node acquisition system, and the plant height value can be directly obtained under the calculation of the microprocessor circuit. Through the verification of the collected specific data, the diameter error obtained by calculation is very small, and the measurement requirement is met.

The acquisition node in the wireless network system realizes the response to the gateway command and the operations of acquiring, packing, sending and the like of the plant height data. The microprocessor chooses STM32F103RBT6 that low-power consumption, high rate operation, peripheral hardware are abundant for the control core, has the AD of 2 12 bit 16 passageways, and plant height measurement sensor connects on the pin of AD passageway through wire (9), and microprocessor supplies power to plant height measurement sensor to gather sensor data, through gathering wireless data transmission module on the node with data transmission to the gateway.

On one hand, the gateway in the wireless network system receives data acquired by the acquisition node through the wireless network, and then transmits the data to the cloud platform through the 4G network to complete data interaction between the acquisition node and the cloud platform; on the other hand, the gateway issues a command to the collection node. The gateway receives the data of the plant height, transmits the data to the cloud platform through the 4G network, and finally displays and stores the data at the remote server. The data transmitted to the cloud platform can be monitored and checked in real time on the upper computer, the data of the plant height can be obtained in time, and the data play an important reference role in controlling the fertilization and irrigation of the plant crops.

Claims

1. The utility model provides a plant height wireless sensor network monitoring devices which characterized in that: plant height measurement sensor includes spiral clockwork spring (8), rim plate (1), fixed axle (7), support (2), fine rule (5), solidus support (3), conical rod (6), many rings of potentiometre (4), plant height measurement sensor connects through wire (9) and the collection node circuit in the greenhouse intelligent monitoring system on AD passageway pin, changes altitude variation's information into voltage signal, collection node circuit's microprocessor chooses for use 32 ARM3 of position, and the plant height information of gathering, through gathering the LORA data transmission module on the node with data transfer to gateway, sends the cloud platform through the 4G network, shows and the storage at remote server end at last.

2. The plant height wireless sensor network monitoring device of claim 1, wherein: the diameter of the wheel disc (1) is 15cm, the width of the wheel disc is 1cm, grooves are formed in the edges of the wheel disc (1), the depth of each groove is 0.5cm, a circular cavity is designed in the center of the wheel disc (1), the diameter of the cavity is 4cm, holes are formed in the original point position of the wheel disc, the wheel disc is sleeved on the fixed shaft (7), and the wheel disc can rotate around the fixed shaft.

3. The plant height wireless sensor network monitoring device of claim 1, wherein: one end of the fixed shaft (7) is fixed on the bracket plate (22), and a groove is formed at the shaft end (7).

4. The plant height wireless sensor network monitoring device of claim 1, wherein: one end of the spiral spring (8) is clamped in the groove of the shaft end (7) of the fixed shaft and is fixed, and the other end of the spiral spring is fixed with the circular cavity wall of the wheel disc (1).

5. The plant height wireless sensor network monitoring device of claim 1, wherein: two ends of the wire fixing support (3) are fixed on the support plate (2), the plane of the wire fixing support (3) is perpendicular to the plane of the wheel disc (1), and a circular wire outlet hole is formed in the position, opposite to the groove of the wheel disc (1), of the wire fixing support (3).

6. The plant height wireless sensor network monitoring device of claim 1, wherein: one end of the thin wire (5) is fixed on the groove wall of the wheel disc (1), the thin wire is uniformly wound on the wheel disc (1), and the other end of the thin wire penetrates out of a wire outlet hole of the wire fixing support (3).

7. The plant height wireless sensor network monitoring device of claim 1, wherein: the mechanical stroke of the multi-ring potentiometer (4) is 10 rings, the high-precision multi-ring potentiometer (4) is adopted, a fixed shaft of the multi-ring potentiometer (4) is fixed on a support wall (21), and a rotating shaft is fixed in a cylindrical groove (11) on the central surface of the wheel disc.

8. The plant height wireless sensor network monitoring device of claim 1, wherein: a pair of conical rods (6) are fixed on the bracket bottom plate (23).