基于DS18B20的测温仪设计

Because the interface signals with SCM is digital signals, undoubtedly, we must use temperature sensor to obtain temperature signal information by microcontroller. The role of the temperature sensor is to change temperature information into electricity or voltage output.Then the converted analog signal converted into digital signals after A/D converter to fit the needs of SCM interface.This design based on the DS18B20 aims to achieve precise temperature measurement which can be carried out three temperature measurement normally.And the temperature measuring range could be -10℃ to 125℃ and accurate to 0.5 ℃. It can also set high or low temperature alarm mechanism according to the need and exchange the temperature between the Fahrenheit temperature and Celsius switch display.