Therefore, this paper attempts to study a wireless temperature monitoring system, which combines the wireless transceiver module with the single-chip microcomputer, and adopts the RF transmitting module and the receiving module with strong anti-interference ability to realize wireless communication and improve the reliability of the system. The monitoring system has the advantages of simple structure, convenient use, low cost, stable and reliable work. 1.1 single chip selection scheme The wireless sensor node needs to realize the collection, processing and wireless transmission of temperature information. The single-chip microcomputer in the wireless sensor node manages and controls the node and performs signal processing. When selecting a single-chip microcomputer, the main reference is to the following standards: First, the power consumption of the single-chip microcomputer is required to be small. Since it consumes the power of the battery in the node and is in a working state for a long time, it must have the characteristics of low power consumption. Secondly, the price of the MCU is required to be moderate, and the cost cannot be too high. In addition, the operating speed of the microcontroller and the size of the program storage space are important for the future expansion of the node function. The wireless sensor node uses the STC12C5A60S2 microcontroller to control the nRF24L01 RF chip and the DS18B20 temperature sensor. The corresponding relationship between the hardware structure and the functional module is shown in Figure 1. Figure 1 Wireless sensor node The new generation STC12C5A60S2 is fully compatible with the traditional MCS-51 series MCU instructions, featuring high speed, low power consumption and strong anti-interference performance. The MCU has 60K of program memory and 1280 bytes of RAM, which can fully meet the software design requirements of the MCU system; and the MCU is a new generation single clock/machine cycle (1T), which is 8 to 12 times faster than the traditional 51 MCU. For future expansion of functions, for example, you can quickly process the routing algorithm of the node where it is located. Therefore, STC12C5A60S2 microcontroller is the ideal choice for constructing this monitoring node. 1.2 wireless transceiver module The nRF24L01 is a low-cost wireless transceiver with an industrial-grade built-in hardware link layer protocol. The device operates in the 2.4 GHz global open ISM band and has built-in frequency synthesizers, power amplifiers, crystal oscillators, modulators and other functional modules that can be directly connected to the microcontroller I/O. The nRF24L01 has low power consumption and operates at -6 dBm with an operating current of only 9 mA. When receiving, the operating current is only 12.3 mA. Multiple low-power modes of operation (power-down and idle mode) are more conducive to energy-saving design. When connected to the SPI interface of the nRF24L01, you can use the SPI port of the microcontroller hardware or simulate with the I/O port of the microcontroller. The transceiver module has a FIFO inside to interface with various high and low speed microprocessors, which is convenient for using low-cost single-chip microcomputers. 1.3 temperature acquisition chip The DS18B20 is simple in structure and uses an I/O data line to both power and transmit data. When the temperature data is collected in the field, the data is directly converted into a digital output. The measurement temperature range is -55 to 125 ° C, the accuracy is ±0. 5 ° C at -10 to 85 ° C; the programmable resolution is 9 to 12 bits, and the corresponding resolvable temperatures are 0.5 to 0.5. , 0. 125, 0. 062 5 ° C, can achieve high-precision temperature measurement; at 9-bit resolution, the temperature is converted to digital in 93.75 ms, and the temperature is up to 750 ms in 12-bit resolution. Converted to digital, the speed is very fast; the measurement result directly outputs the digital temperature signal, which is serially transmitted to the processor by "first-line bus", and can transmit CRC check code, which has strong anti-interference and error correction capability. OVNS Max Vape is so convenient, portable, and small volume, you just need to take them ovns max vape bar,ovns max vape pen,ovns max vape device,ovns max vape disposable,ovns max vape puff Ningbo Autrends International Trade Co.,Ltd. , https://www.mosvapor.com At present, most of the temperature monitoring systems in China are traditional methods, mainly including local data acquisition and real-time temperature monitoring systems for wired communication. The former has a single measurement method, the measurement data is discontinuous and the timeliness is poor, and the latter lacks flexibility. Sexual and applicable environment is limited. With the rapid development of information communication and electronic technology, the traditional data collection methods can no longer meet the needs, which seriously restricts the development of modern monitoring systems. For example, in a case where the monitoring area environment is complicated and the position distribution of the monitoring points is relatively dispersed, the wiring is complicated and slow, and the human and material costs are large, and it is not suitable for wired communication with the control center. Wireless monitoring system is one of the most important applications in the development of wireless technology. The wireless network can enhance the flexibility and expandability of the monitoring system, eliminating the trouble of network wiring.
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