The Development Of Thermostatic Shaker Based On The Embedded Technology

The thermostatic shaker is a kind of biochemical instruments which combines the incubator with the shaker function together. The product is used in plants, biology genetics, viruses, microbial, food, petrochemical industry, biological heat precision training, etc. It is an indispensable laboratory-equipment in environmental protection, medical research, education research and precise cultivation for production department. This Paper has designed a thermostatic shaker, which is a scientific experiment widely used in the research area of medicine, pharmaceutical, biological, food, environmental protection, inspection and agricultural.This paper adopts double CPU structures, whose core micro-processor is LPC2378 based on ARM7 architecture and combined with MCU AT89S52 to control different modules. The Paper elaborates the hardware structure and software design of each module.This thermostatic shaker system can set the parameters, like speed, temperature and print time by the keyboard, and the system can arrive the steady state quickly follow the parameters. Then, the real results of the each condition are showed on the LCD screen. The Keyboard setting and LCD showing belongs to AT89S52 control module. The keyboard and display module is connected with the main control module by RS485 bus in the hardware, and using the Modbus protocol to communicate in the software. The speed control module to realize speed adjustment by using SCR (Silicon-controlled rectifier) control technology, and temperature module is mainly adopts the PID algorithm to control. All of these modules are controlled by the core chip LPC2368. Additionally, the thermostatic shaker system has the network communication function based on the embedded TCP/IP technology. PC can get the real-time data of each module from the thermostatic oscillator, which is controlled by the main chip LPC2368, and show on the local screen. So it can achieve remote monitoring, while most of the current market similar products do not have such function. According to the design of this paper, the combination of hardware and software can ensure steady working state of the thermostatic shaker. It is able to meet user's demands very well.