Dsi820 Enzyme-based Embedded Systems, Biosensors,

The design of DS1820 enzymatic biosensor based on embedded systems is my own novel research work. This sensor is furtherimproved compared with that of the thermistors in circuit and volume as well as web. The development of biosensor has been introduced. Especially, the efinition and kinds of enzymatic biosensors has been discussed. According to the definition of biosensor, sensor to get biological signal has been made. Taking account of feature of enzyme(a kind of special protein),the selection of biological enzyme has been investigated effectively. The different enzyme will be choiced for different biological subject. The different biological enzyme will result in different biochemical reaction. During the poried of biochemical reaction, many biochemical reactions usually acompany a change of heat quantity. The concentration of the reactant can be reflected by the change of these biological quantities. The principle and method of measuring temperature have been deeply studied. One-wire intelligent temperature sensor, which is made by DALLAS COMPANY in America, has been taken in order to decrease price of sensor and volume. It is a kind of intelligent temperature-sensor with new microprocessor. And intelligent temperature-sensor belongs to the scope of an intelligent and integrated temperature-sensor. Its major advantage is that digital technology has been in it. Temperature value will be given out through digital form. It will be very accurate and it can more protest interference further than others. It can transport data for long distance. High and low limits of temperature can be set up by users. If temperature is over the limit. The alarm will be given. It has own data-bus and interface etc. It can adapt to any kinds of microcontrollers and microprocessors as well as microcomputers. It is a necessary part to develop new temperature measuring- system, which has excellent functions and is very cheap. Using the unique technique of one-wire bus of DALLAS Company DS1820, temperature value measured (nine binary codes, including signal) are directly sent out through communication port. If model of accurate result is taken, precision will get to 0.1℃. Typical parameter of temperature todigital conversional time is 200 ms. Maximum number is 500ms. It includes 64 bits ROM. Number of product occupies 48 bits except 8 bits of CRC. It mostly includes parasite power, temperature sensor, 64 bits laser ROM, one-wire port, high speed register (convenient RAM to restore data in progress, TH Flip-Flop register and TL Flip-Flop register to restore high and low limit number of temperature), restoring and controlling logic, 8 bits CRC generator etc. The enzyme is put before DS1820. It will get temperature change when reaction under enzyme goes. Therefore, the concentration of reactor will be got. Embedded systems is adopted in the developing when DS1820 is developed. Taking C51, design program is simplified further, the good foundation of both developing and the webbing for equipment is laid.