Description: This program is Maxim temperature sensor DS18B20 single temperature reading and display, DS18B20 using an external power supply, data cable to the MCU P2.7 port, an access way, do not skip reading ROM, fractional part of the temperature data will be disposed of, as long as the integer part. Display is connected using the P0 port 8, four common cathode tube because of dedicated board so the digital code value and general practices are no different. Temperature sensor default 12bits format, and made a deal with the data, the fractional part and negative temperature abandoned. an increase of temperature alarm function, you can set maximum and minimum values.
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