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Paddy Jincang humidity automatic detection alarm control system research and design

Author: ZhangLiLiang
Tutor: KongXiaoLing
School: Anhui Agricultural University
Course: Mechanical Design and Theory
Keywords: Humidity Sensor AT89C51 ADC0809 Paddy humidity detection
CLC: S379.3
Type: Master's thesis
Year: 2009
Downloads: 149
Quote: 0
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Abstract


In large grain depots, the acquisition of rice grain due to humidity will cause mildew. Before the current rice Jincang manually pumped mainly by packet inspection, the humidity is difficult to control, and only when the humidity is too large pumping packages, affecting the appearance and odor cereals only when detected. How to use detection equipment in food Jincang before detecting humidity transporting food, substandard food stand in the warehouse door, in order to improve the quality of stored grain, which is the food reserves in the important issue of concern. At home and abroad for humidity detection methods are wet bulb method, electronic humidity sensor method. This paper aims to study food for large grain Jincang humidity during transport before unpacking the real-time detection and timely alarm notification and automatic control inspection personnel transport units. This design of paddy Jincang humidity detection system using AT89C51 widely used as a control center, using rice moisture and humidity sensor JCJ100D the signal is converted to a voltage signal by the analog / digital conversion chip ADC0809 complete A / D conversion, while the shift register 74LS164 serial input / parallel output display of humidity and humidity data through the serial port to the PC machine. Finally, rice moisture analysis results of the analysis alarm and cut off the motor to prevent high humidity Jincang rice, thus avoiding moldy rice. This article is in the full investigation of the domestic rice moisture and humidity detection system detects the application, and to analyze and study the basic principles of the detection system, focuses on the rice Jincang humidity detection system circuit system hardware design and software design. In hardware design, according to the system's accuracy, timeliness, and cost requirements, select the appropriate components and press modular design, debug; each module after successfully merged into the system debugging. In software design, according to requirements, combined with hardware circuit design, completed the MCU initialization, the analog signal sampling, signal processing, real-time display, serial communications, motor control; and completed the design of the PC program interface, serial communication design and data processing procedures. On the development of the rice Jincang humidity detection system was calibrated and tested with the development of instruments for measuring rice humidity conducted several trials to achieve a paddy humidity signal acquisition, LED display real-time data, upload data to a PC, while according to the set maximum value of humidity in the motor control, alarm. Paddy Jincang humidity detection system measurement accuracy of 1.005%, the data from acquisition to save about 3 times / sec. Run the test results show that the system of the indicators have been designed to meet the basic requirements, the basic realization of paddy Jincang humidity detection system real-time measurements.

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CLC: > Agricultural Sciences > Agriculture ( agronomy ) > Agricultural harvesting, processing and storage > Storage > Warehouse equipment and management
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