Design and Implementation of Greenhouse Wireless Acquisition and Control System Based on CC2530
introduction Agriculture is the foundation of national development. China is a big agricultural country, but it is not a strong agricultural country. Developing green agriculture is an important way to improve China's agricultural level. As an important part of modern agriculture, greenhouses can make agricultural production free from climate and geographical constraints and greatly increase crop yields. At present, the level of intelligence and informationization of greenhouses in China is still very backward. Collection and control are the two basic components of modern greenhouses. At present, most of the collection and control of greenhouses are transmitted by cables. When there are many sensors and control devices, the lines are messy, the construction is difficult, the cost is high, the maintenance and upgrade is difficult, and the greenhouse is high. Temperature, high humidity, and acidic environment can easily cause corrosion and aging of the line, affecting the reliability and safety of the system. Aiming at these problems, this paper designs a greenhouse wireless acquisition and control system based on CC2530. This system not only realizes the real-time collection and wireless upload of greenhouse multi-point data, but also realizes the wireless control and automation of equipment control. The need for human participation has a high application value. 1 overall system design The system structure is shown in Figure 1. The data is collected by a plurality of sensor nodes distributed in the greenhouse, and wirelessly transmitted to the central node. The central node collects the sensing data of each collection node and uploads it to the monitoring computer, and the monitoring computer performs data processing, display and storage, and performs control according to the data processing result. The command is sent wirelessly to the control device via the central node to automate and wirelessize acquisition and control. 2 hardware design 2.1 main control chip The system uses the CC2530 wireless SOC as the main chip, which integrates the microprocessor and the wireless RF module on one chip. It is a new generation ZigBee solution introduced by TI. The core of the CC2530 is an enhanced 8051 microcontroller with 8KB of SRAM memory and 32/64/128/256KB of optional flash memory. The clock frequency is up to 32MHz, which can meet the data processing requirements of different applications. Automatically switch to 32KHz low frequency mode during sleep, minimize energy consumption: the core of the wireless RF module is CC2520 chip, working in the ISM license-free authentication band 2.4GHz, using DSSS spread spectrum technology, with excellent receiving sensitivity (-98dm) And the link budget (103dB), the maximum transmission rate of 250Kbps, fully in line with the IEEE802.15.4 protocol standard. 2.2 Sensor node This system selects DHT11 greenhouse dual-purpose digital sensor, the sensor is single-bus digital signal output, working voltage 3.3～5.5V, temperature measurement range 0～50°C, accuracy ±2°C, humidity measurement range 20～90%RH, precision ±5% RH. 2 is a circuit connection diagram of the DHT 11. The DHT11 is connected to the CC2530 module through a data line to form an acquisition module. After a reading is completed, the temperature and humidity data are transmitted bit by bit on the data line, and FIG. 3 is a sensor node frame diagram. Nlw-Ecl Pm Fiber,Diode Pumped Lasers,Gemini Diode Laser,Gp Fast Diode Laser AcePhotonics Co.,Ltd. , https://www.cgphotonics.com
