An Inspecting System Of Temperature And Humidity Measurement,Fireproofing And Guard Against Theft In Grain Depots

In this paper, the inspecting system of the grain situation in grain depot has the fuctions of temperature and humidity measurement , inspecting human intrusion and fire smoke.This system is controlled by a two-level computer, and it is a distributed inspecting system with a principal and subordinate structure. It takes Personal Computer as the main computer and AT89C52 single-chip micro-controller as the subordinate frame.The fore part of data acquisition is including: (1) adopting 1-wire digital thermometer DS18B20 to measure temperature ; (2) adopting capacitive humidity sensor HS1101 to measure humidity ; (3) adopting pyroelectric infrared detector P2288 to realize the detection of human intrusion ; (4) adopting ionization smoke detector NIS-09C and A5348 integrated circuit to make up of the fireproofing circuit.The subordinate computers communicate with the main computer through the serial bus.The system software uses the design of software engineering to realize the structurization of the program and the modularity of the functions.This system has a test run in the laboratory, and the results are satisfactory.