ass日本风韵熟妇pics男人扒开女人屁屁桶到爽|扒开胸露出奶头亲吻视频|邻居少妇的诱惑|人人妻在线播放|日日摸夜夜摸狠狠摸婷婷|制服 丝袜 人妻|激情熟妇中文字幕|看黄色欧美特一级|日本av人妻系列|高潮对白av,丰满岳妇乱熟妇之荡,日本丰满熟妇乱又伦,日韩欧美一区二区三区在线

To measure the parameters of soilless substrates quickly and accurately, based on a self-made compound sensor for multi-parameter of soilless substrates, combined with ZigBee wireless network technology, a portable wireless detector for multi-parameter of soilless substrates was designed. Considering the practicality and convenient operation, the principle of separated design was employed. The detector included a handheld terminal and a wireless compound sensor. The wireless compound sensor, including a self-made compound sensor and a CC2430 wireless module, collected data of water content, electrical conductivity and temperature in soilless substrates, and sent the data to the handheld terminal by wireless. Then, the handheld terminal received the data through another CC2430 wireless module, and progressed with a MSP430F5438A single chip. The measure results can be displayed, recorded, queried and deleted with the help of a 12864 LCD displayer and a keyboard. The tests demonstrated that error range of water content measurement was -0.4%~3.1%, and relative error range was -3.2%~9.6%; error range of electrical conductivity measurement was -0.015~0.179mS/cm, relative error range was -4.7%~10%; the error range of temperature measurement was -0.63~0.69℃, the relative error range was -1.1%~3.3%. The measurement error of detector was small enough to match the detection precision of agricultural production, and the detector was suitable for different substrates.