The key technologies of a distributed temperature monitoring system based on 1-Wire bus

This paper focuses on improving the quality performance of 1-Wire bus which is mostly necessary to practice application. The key technology about 1-Wire bus that applies to DS18B20 and other 1-Wire bus serious manufactures is introduced in detail. The numbers of sensors hanging on 1-Wire bus are received according to the data bus driving ability and communication distance produced by our experimental platform, and the relationship between them is also studied. The credibility of the data transferred is substantially improved by the proper use of cyclic redundancy check presented in this paper. Also the photo electricity coupling technique is introduced to minimize the impact of interference when IPC and MCU communicate with each other.