Development of soil nutrient speed measuring instrument by using the mature photoelectric colorimetric principle

The soil nutrient rapid tester is the earliest developed based on the qualitative color analysis device of the color box. Henan Agricultural University has been developed and developed as early as the 1970s. The agent used in the L&Vngte Speed ​​Tester is a powder rather than a liquid, and the shelf life is greatly extended. This qualitative analysis is generally used in flowers, fruit trees, gardens and greenhouses. The sensitive electrode used in the soil nutrient rapid tester is extremely unstable. If the improper storage performance is easy to change, the rapid measurement soil nutrient speedometer developed by the FET sensitive membrane has a long shelf life despite the stable performance of the sensor. It is still in the research and development stage. The most common method for accurate determination of Ding soil is chemical analysis based on photoelectric colorimeter. The key technology is to solve the problem of portability and rural soil removal from conventional laboratories. This is our preferred solution. From the perspective of Changlang's development, with the development of testing technology, physical testing methods will gradually replace chemical analysis methods. For example, the chlorophyll nitrogen analyzer developed by Spectruril has great development prospects. If it is combined with GPS system, the prospect is more broad.
The author believes that the soil nutrient rapid tester is different from the general test instrument. Because the speed of soil testing is not only the speed of the instrument, but also the speed of the pre-treatment; the cost of soil testing is not only the price of the instrument. It is also the time spent on measuring the entire cycle of the soil. Therefore, we regard the speedometer not only as a special photoelectric colorimeter, but also as a carrier of low-cost speed measurement technology, and as a carrier of complete sets of rapid measurement technology. Soil testing equipment. Only 28 can make the developed speedometer really work in the rural grassroots.
Soil nutrient speed measuring instrument design technology to fully understand the development of related technologies at home and abroad, we have developed a soil nutrient speed measuring instrument using the technology of photoelectric colorimetric principle, and strive to solve the following key technology: 1 low cost, monochromatic light The generation, light source selection, power supply, colorimetric tank design and protection from light, soil moisture measurement, instrument body and portability, recommended fertilization program and pharmaceutical support.
The soil nutrient rapid tester adopts microprocessor technology, especially a single-chip computer with ashEPROM containing A/D, which has superior performance and low price, and can conveniently realize the interface between the display and the keyboard. The system mainly detects the photoelectric signal, and this photoelectric signal is a slow change signal, which does not require high sampling rate. Therefore, A/D 7135 can be selected as the analog-to-digital converter 1, and 128×64 L (33 liquid crystal display) is selected. It can realize four lines of 8 characters per line, and display a total of 32 characters on one screen. In addition, the number of keyboard keys can be selected according to the design requirements. In addition, the address decoding, clock and reset necessary for the basic microprocessor system are also included. Circuits, etc.

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