| Moisture Detection Technology is a multidisciplinary and comprehensive technology. For decades, through the unremitting efforts of scientists has made gratifying achievements. However, many factors affect the water ratio, the measurement accuracy and repeatability has been unable to obtain satisfactory results.The subject of the first study of the detection method of wood moisture content, moisture content rate increased from 30% to 0%, the resistance increased by about 100 times. Wood moisture content is low, low conductivity, can be equivalent to high-value resistor, so use of advanced high value resistance measurement method:multi-range resistance measurement. First, determine the scope of resistance, the amplifier switches to the appropriate range amplified voltage signal by the A/D converter MCU given resistance value calculated.Analysis of two temperature compensation algorithm, namely, two-dimensional regression analysis, cubic spline interpolation method. Cubic spline interpolation method has high precision, speed and storage space required for small, low cost, it has taken this approach.Wireless transmission technology for simple to use, inexpensive, the advantages of high speed communications, RF communications, access to a wide range of applications. Short-range wireless technology can be used within the transmitter and receiver module to replace cable connections. Construction of wireless transmission control system can reduce the system cost, and the system easy to use, has broad applicability. This paper applies the company's new RF chip NORDIC nRF24E1 building as a central element of wireless transmission system. The chip integrates advanced manufacturing technology, single chip RF transceiver Gongneng and integrated in a single chip, requiring little Waiweiqijian Jiu Ke Yi build a wireless module, greatly reducing the development cycle and development costs.In this paper, a wireless data transmission based on drying parameters detection system design, rational use of wireless technology. And wireless transmission to the distance test, switch test and transmission test send and receive large amounts of data. The experiment on the module hardware and software correctness, completeness test can be used outdoors around 15 meters of wireless data transmission. Therefore, this system can replace the cable data transfer, to complete the drying parameters in transmission. System parameters can be achieved drying the collection, processing and distribution, to solve complex problems on-site connections, and low cost, reliability, practicality and so on. |
PDF Full Text Request