ZIGBEE Intelligent Grain Depot Temperature Control Management System Solution
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1. Project background
Food is the basic material for human survival and an important material related to the national economy and people’s livelihood. Food has always been the basis for economic development, social stability, and the country’s self-reliance.
At present, all major grain depots in our country have problems of different degrees of grain deterioration. Most grain depots also use manual temperature measurement, which not only increases the workload of the grain depot staff, but also has low efficiency and poor results. Especially the temperature measurement of large grain depots cannot be completed in time and completely, resulting in a large area of bad grain. According to statistics, the amount of moldy and spoiled grain in my country due to improper storage of grain amounts to hundreds of millions of catties each year, causing immeasurable losses.
The temperature and humidity of grain is the most important parameter that affects the storage of grain. How to control the temperature and humidity of the grain warehouse has become the only way to ensure the quality of grain. Beijing Huiqi Internet of Things Technology, based on the research and development and application of the Internet of Things, actively responds to the country’s call to “vigorously develop the Internet of Things”, and takes “Comprehensive Perception-Reliable Delivery-Intelligent Processing” as its core concept. After applying the process, the ZIGBEE technology is fully applied to the intelligent management of the grain depot, making the process management of the grain depot more scientific and efficient.
2. Current status of grain depot temperature control
The early temperature and humidity control of the grain storage mainly used test equipment such as dry thermometers, hair hygrometers, bimetallic meters, humidity test papers and other test equipment to test manually. It puts the thermometer into the plunger and inserts it in multiple temperature measurement points of the grain pile based on experience. The manager regularly pulls out the readings to determine the high and low temperature of the grain, and then decide whether to pour the grain. This method has a certain effect, but due to thermometer accuracy, manual reading errors, manual reading efficiency and other reasons. As a result, the temperature control detection speed is slow, the accuracy is low, the sampling is not thorough, and the local temperature is too high, which is not easy to be found. In turn, local grains become moldy and deteriorate, causing large areas of bad grains.
3. System introduction
This system uses the most advanced ZigBee wireless transmission technology. Separate temperature and humidity sensors in different places of the grain depot. The temperature and humidity sensors use wireless transmission. The data measured on the spot is transmitted to the reader in the grain depot through wireless electromagnetic waves, and the reader then passes through a wireless repeater. The data is wirelessly transmitted to the computer, and the computer stores the received data and compares it with the standard value set by the system. If the on-site value exceeds the standard value, the system will alarm to inform the management personnel, and will automatically control the fan and other equipment for cooling.
4. System Module
4.1 Hardware composition
4.1.1 Temperature and humidity label:
The temperature and humidity tag is composed of 3 parts: a miniature analog temperature and humidity sensor, a single-chip microcomputer, and a wireless transceiver module. The tag contains a unique ID number in the world.
Miniature analog temperature and humidity sensor: It uses a miniature analog sensor, which will collect the temperature and humidity parameters in the grain depot from time to time, and transmit the data to the single-chip microcomputer for processing. The sensor uses TI’s smart module, which is high-precision, ultra-micro, and high-stability all in one. Very suitable for temperature sensing in small spaces.
Single-chip microcomputer: adopts enhanced 8051 single-chip, which is a relatively classic single-chip microcomputer in industrial control, with stable and reliable performance and powerful functions. After the single-chip microcomputer receives the temperature and humidity signal, it transmits the digital signal to the wireless transceiver module through A/D intelligent conversion and amplification.
Wireless transceiver module: modulate the digital signal transmitted by the single-chip microcomputer into electromagnetic waves. Using TI’s CC2420 chip, power supply, 2.4~2.5GHZ communication frequency band, the farthest wireless transmission is 1000 meters.
The main function of the temperature and humidity tag is to collect on-site temperature and humidity data, send it wirelessly to the reader, and upload the data to the computer via the reader.
Classification of temperature and humidity labels:
Box type temperature and humidity label:
4.1.2 Reader:
The received electromagnetic wave signal is demodulated. The single chip and transceiver module are also integrated in the reader. The transceiver module of the reader only accepts the signal sent by the sensor tag. The reader will upload the demodulated signal to the computer using the serial port and the network port.
4.1.3 Computer:
Adopt industrial control machine, built-in reliable industrial serial port or network port, to ensure the stability of data transmission; The system adopts configuration software, which can realize fast data analysis ability and powerful I/O port expansion control.
4.2 Software composition:
Dynamic recording function: continuously and truthfully collect and record the monitoring of temperature, humidity and other parameters, and display and record the monitoring information in real time in the form of numbers, graphics, and tables;
Over-limit alarm function: When abnormal data occurs, such as temperature, humidity, and humidity exceeding the upper and lower limits, multiple alarms can be output in a manner specified by the user. Such as: sound alarm, telephone ringing alarm, email alarm, short message alarm, short message group sending can be set, and the system can notify different personnel on duty at different times;
Data statistical analysis function: real-time display or historical display of the curve changes of various parameters of the room, and the environmental parameter curves of multiple different rooms can be displayed at the same time, which is more convenient for comparison and analysis. It can display parameter lists, real-time graphs (correspond to specific values and adjust coordinates arbitrarily), real-time data, converted data, accumulated data, history, alarm screens, reports and other display and statistical functions are more close to user needs;
5. Process introduction
When the label is placed in the grain store, the label will collect the temperature and humidity information in the grain store from time to time; and automatically send the data to the reader; the reader transmits the data to the computer through the serial port or the network port; The computer will store and compare the received data. The system will drop out the set standard value and compare it with the collected field data; when the field temperature and humidity are higher than the standard value, the computer will control it through its I/O control port. The on-site fan starts to cool down; at the same time, the computer monitors the temperature and humidity in the granary through the signal of the sensor from time to time, and knows that the set value is reached.
For example:
Each temperature and humidity sensor has an ID number, and this ID number is composed of 24-bit letters and numbers, which can realize unlimited serial number combinations, which can realize a globally unique ID number;
The ID number of each tag corresponds to its location. This can be bound to the information of the ID number when the system builds the database. That is, when the system reads the ID number with the serial number “1234567”, the system will know that the label is in: No. 6 warehouse, the third temperature and humidity label, the specific location is: height 6.5 meters; distance from wall A 3.2 meters; 6.2 meters away from wall B; if the temperature measured by the tag is high, the system will know the specific location for easy adjustment.
When the tag measures the field data, it will use its own built-in power to activate the wireless transceiver module in the single-chip microcomputer to send the data wirelessly. The transmission distance can be up to 1000 meters; the transmission distance of the tag can be modulated according to the specific distance on the site. It can be adjusted between 10 and 1000 meters. At the same time, the tag uses electromagnetic waves to transmit and has a strong penetrating power. Even if the tag is implanted in the grain, it can be read accurately.
The tag transmits the data to the reader, and the reader transmits the demodulated data to the computer through the serial port 485 bus. The reader is mounted on the outside of the granary and transmits data to the computer through a cable. This saves space in the granary with limited space, and at the same time avoids the problem of cumbersome wiring in the silo.
The computer receives the digital data from the reader and compares it with the standard value set in the system. Shown as follows:
When the system detects that the temperature or humidity exceeds the standard value, on the one hand, it will alarm and inform the management staff, which will be handled by the warehouse keeper; on the other hand, it will automatically control the cooling equipment in the warehouse to turn on: like turning on the fan to remove moisture and heat; or through Adjust other equipment. At the same time, the system will constantly check the temperature and humidity values from the tags. When the temperature and humidity drops to the standard value, the system controls the cooling device to shut down.
Company Name: Beijing Huiqi Tongda IOT Technology Co., Ltd.
Address: Room 303, 3rd Floor, Mingshang Building, No. 55 Suzhou Street, Haidian District, Beijing
Contact number: 010-57035818
Contact: Zhao Wen
Contact number: 13001076144 18663539058
Mail:
[email protected]
URL:
www.bjwlwkj.com
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