CN203405284U - Multifunctional wireless soil environment monitor - Google Patents

Abstract

The utility model relates to a multifunctional wireless soil environment monitor. The monitor is equipped with a measurement switch button, a light inlet window, a rotatable emission antenna, insertion pins and a SD card port, and a humiture sensor, an illumination sensor, a carbon dioxide sensor, a SD card and a signal processing and radio communication circuit are arranged in the monitor. The monitor can realize the functions of real-timely monitoring the various parameters of an agriculture soil environment, carrying out the multi-point wireless measurement, etc. to improve the agriculture production efficiency, at the same time, carries out wireless signal communication and SD card storage on the measurement information, and is suitable for the measurement and teaching experiment of the agriculture soil environment.

Description

Multifunctional wireless soil environment monitor

technical field

The utility model relates to a multifunctional wireless soil environment monitor, which belongs to the application field of electronic technology and agricultural technology.

Background technique

In the process of agricultural production, changes in temperature and humidity are important growth environmental parameters in the growth of agricultural crops, and various environmental parameters such as temperature and humidity directly affect the growth of crops. However, due to the rapid change of various parameters in the soil environment, users often cannot monitor at any time and make effective judgments, resulting in low agricultural production efficiency.

The traditional measurement of environmental parameters such as soil temperature and humidity is mostly done manually, which is more cumbersome and less efficient than automatic measurement. At the same time, if you use a fixed temperature and humidity recorder, it can only be placed in a specific area, and in some cases, it is limited by the measured environment, conditions, and test areas, so it is necessary to use a portable measurement that can record multiple test areas. Way. In order to ensure correct measurement data of agricultural soil environment and consider the convenience of operation, it is necessary to develop an instrument that can monitor and measure various parameters of soil environment.

Aiming at the problems of inflexible sensor placement, many wires and low monitoring efficiency in the traditional soil environment monitoring system, a multifunctional soil environment monitor based on wireless communication is proposed, and wireless communication technology is applied to environmental parameters such as soil temperature and humidity. monitoring, and the data can be transmitted to the user's receiver or computer via wireless remote, so that the user can grasp the environmental changes of the farmland soil in real time, and make reasonable judgments and responses accordingly, so as to effectively improve the quality of crops with yield.

At the same time, compared with the traditional fixed single-parameter monitoring method, the utility model can not only realize the real-time monitoring of various parameters of the agricultural soil environment through a variety of sensors, but also adopt wireless communication technology to flexibly perform multi-point measurement. It can more comprehensively reflect the changes of environmental parameters of farmland soil.

Utility model content

Aiming at the shortcomings of the existing measuring instruments, the utility model adopts the wireless single-chip microcomputer CC2430 to form the signal processing and wireless communication circuit, and combines the new digital temperature and humidity sensor SHT75 as the sensing element to connect to the wireless transmitting end, and place it in the place to be measured. In the soil environment, each sensor signal can be transmitted to a long-distance wireless receiver. At the same time, the monitor can save the measurement data in the SD card, which facilitates the use of data.

This multifunctional wireless soil environment monitor is equipped with a measurement switch button, a light-transmitting window, a rotatable transmitting antenna, an insertion foot and an SD card port. The monitor has a temperature and humidity sensor, a light sensor, a carbon dioxide sensor, and an SD card. , signal processing and wireless communication circuits.

The utility model uses a variety of sensors to obtain various parameters of the soil environment. In consideration of low cost, low power consumption, high precision and simplified flexibility, the selection of various sensors is as follows: air temperature and humidity sensor selection SHT75, TSL2550 is used for the light sensor, and B-530 is used for the carbon dioxide sensor.

The core device of the signal processing and wireless communication circuit of the utility model is a CC2430 chip, and the CC2430 is a system chip of TI Company. It can improve performance and meet wireless 2.4GHz ISM band applications, and the requirements for low cost and low power consumption. It combines a high-performance 2.4GHz radio frequency transceiver core with an industrial-grade compact and efficient 8051 controller, and combines 8Kbyte RAM and powerful peripheral modules.

The CC2430 chip also includes analog-to-digital converters, 4 timers, AES128 coprocessor, watchdog timer, 32kHz crystal oscillator sleep mode timer, power-on reset circuit, power-down detection circuit, and 21 programmable I/O O pin. The CC2430 chip is produced with a 0.18μm CMOS process; in the receiving and transmitting modes, the current consumption is lower than 27mA or 25mA respectively. CC2430 only needs a small amount of peripheral components to cooperate to realize the signal receiving and processing functions.

数字传感技术，具有极高的可靠性和卓越的长期稳定性，含有已校准的数字信号输出的温湿度复合传感器。其内部包括一个电容式聚合体测湿元件和一个能隙式测温元件，并与一个14位的A/D转换器以及串行接口电路集成在同一芯片上，它可与单片机直接相连，此外，该传感器还具有响应速度快、抗干扰能力强、性价比高等优点。且输出为数字信号，抗干扰性优于同类芯片。测量湿度范围为0～100%RH，温度范围为-40～120℃。The core device of the temperature and humidity acquisition circuit of the utility model is the SHT75 chip, which is a single-chip sensor launched by Sensirion in Switzerland, based on the world-leading

Digital sensing technology, with extremely high reliability and excellent long-term stability, contains a temperature and humidity composite sensor with calibrated digital signal output. Its interior includes a capacitive polymer moisture measuring element and an energy gap temperature measuring element, and is integrated with a 14-bit A/D converter and serial interface circuit on the same chip, which can be directly connected to the microcontroller. In addition, The sensor also has the advantages of fast response speed, strong anti-interference ability, and high cost performance. And the output is a digital signal, and the anti-interference is better than similar chips. The measuring humidity range is 0~100%RH, and the temperature range is -40~120℃.

The light sensor TSL2550 is a digital sensor, which is also connected to the I ² C bus. It has two photodetectors, one that detects visible and infrared light, and one that detects infrared light. Subtracting and digitizing these two measured readings results in a light intensity similar to what the human eye perceives. TSL2550 integrates an analog-to-digital converter, which can directly convert the detection result into a serial digital signal output, which simplifies the hardware design.

Carbon Dioxide Sensor B-530 is a small and light NDIR technology CO ₂ sensor module with a service life of 10 years and a measurement range of 0-10000ppm.

The SD card port of the utility model has a cover sheet, which can prevent dust and rainwater from entering the monitor, and the SD card adopts a microSD card format.

Description of drawings

Figure 1 is the appearance of the monitor, where 1 is the measurement switch button, 2 is the light-transmitting window, 3 is the rotatable transmitting antenna, 4 is the insertion pin, and 5 is the SD card port.

Figure 2 is a circuit diagram of the sensor acquisition interface.

Figure 3 is a circuit diagram of temperature and humidity acquisition.

Detailed ways

In conjunction with the accompanying drawings, the work and circuit conditions of the multifunctional wireless soil environment monitor will be described in detail below.

The design of the utility model takes factors such as low cost, low power consumption, miniaturization, stability and reliability into consideration. The monitor system is mainly composed of sensor module, data processing module, wireless communication module and power supply module. Various sensor modules are responsible for collecting soil environmental data and providing them to the data processing unit; the wireless communication module is responsible for wireless communication, exchanging information and storing data.

In the sensor acquisition interface circuit, SDA is the data line, and SCK is the clock line, and they communicate with CC2430 through interfaces P0.2 and P0.3.

In the temperature and humidity acquisition circuit, the power supply voltage of the chip is 3.3V, and a 100nF capacitor C42 is installed between the power supply pin and the ground to play the role of decoupling and filtering. The serial interface is a two-wire structure. The serial clock input SCK is connected to P0.3 of CC2430 for communication synchronization between CC2430 and SHT75; the serial data DATA is a three-state gate structure, which is connected to P0.3 of CC2430. 2 connected for data reading. DATA changes state on the falling edge of SCK clock and is only valid on the rising edge of SCK. During data transmission, when the SCK clock is at a high level, DATA needs to remain stable. In order to avoid signal conflicts, a 10kΩ pull-up resistor R47 is installed to make P0.2 output a low level.

B-530 is an analog sensor, which can complete analog-to-digital conversion through the internal ADC input channel of P0.5 port of CC2430, without external A/D converter.

The monitor can use the obtained measurement information for wireless communication and also store it in the SD card to facilitate data backup, use and reading.

The utility model can collect soil environment parameters including temperature, humidity, carbon dioxide concentration and light intensity in real time. Complete real-time wireless monitoring of farmland, multi-point wireless measurement and other functions, and the application in the agricultural field will have a good development prospect. At the same time, the monitor can store the measurement information in an SD card and transmit wireless signals, which is suitable for the measurement and teaching experiments of the agricultural soil environment.

Claims (3)

1. a multifunction wireless soil environment monitoring instrument, is characterized in that: on monitor, be provided with measuring switch button (1), light inlet window (2), rotatable emitting antenna (3), insert pin (4) and SD card port (5); In monitor, there is Temperature Humidity Sensor, optical sensor, carbon dioxide sensor, SD card, signal processing and radio communication circuit.

2. multifunction wireless soil environment monitoring instrument according to claim 1, is characterized in that: the signal in its monitor is processed and the master chip of radio communication circuit adopts CC2430.

3. multifunction wireless soil environment monitoring instrument according to claim 1, is characterized in that: on the SD card port on its monitor, have matte, its SD card adopts micro SD card form.

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