Design and Implementation of Grain Depot Wireless
Temperature Monitoring System Based on 51 MCU
Abstract
Food is the national strategic materials and the daily necessities of the people.So food
security is the foundation of national security.However,our country grain-mildewing accidents
occur frequently, causing huge waste, endangering national food security.To this end, this
paper design and build the grain depot temperature monitoring system, mainly used for
real-time monitoring the granary of the temperature in the grain warehouse.In order to control
the grain situation, complete the prevention measures, and prevent food safety accidents.
This paper first theoretically discusses the importance of temperature monitoring and
discuss the allowed range of food warehouse temperature.Meanwhile,The paper discusses the
principle and method of measuring grain warehouse temperature.On this basis, the paper
begin to design and implement the wireless temperature monitoring system of the grain
warehouse.This system uses microcomputer, temperature sensor and wireless sending module
to constitute temperature detection and sending device;uses microcomputer, LCD display and
wireless sending module to constitute temperature receiving and display device;uses voice
chip to constitute temperature-voiced and over temperature alarm device.Finally, the system
realizes the temperature signal wireless transmission, real-time monitoring of multiple points
temperature,temperature-voiced and over temperature alarm.
The design indexes: temperature detection range for - 40 ℃ to 60 ℃ and the temperature
detection error < = 0.5 ℃.The temperature controls target range for - 10 ℃ to 30 ℃. And the
system is automatically alarming when the temperature is above target range.Thus,it easy to
facilitate management staff to grasp and control of the temperature.This system using a
wireless radio frequency technique, the effective distance is 200 meters, can completely
satisfy the small and medium-sized grain warehouse temperature monitoring.
Key words：grain depot, multi-points temperature monitoring, wireless transmission,
51 MCU
