18B20数字温度显示系统

主机控制DS18B20完成温度转换必须经过三个步骤：初始化、ROM操作指令、存储器操作指令。必须先启动DS18B20开始转换，再读出温度转换值。本程序仅挂接一个芯片，使用默认的12位转换精度，外接供电电源，读取的温度值高位字节送WDMSB单元，低位字节送WDLSB单元，再按照温度值字节的表示格式及其符号位，经过简单的变换即可得到实际温度值.

-18B20 host control system, digital temperature display temperature conversion must be completed DS18B20 three steps: initialization, ROM instructions, the memory operation instructions. DS18B20 start the conversion must be started, read the temperature conversion value. This procedure is only attached a chip, using the default 12-bit conversion accuracy, an external power supply, read the temperature value high byte sent WDMSB unit and the low byte to send WDLSB of units in accordance with the temperature-byte format and representation the sign bit, after a simple transformation can be obtained by the actual temperature.