利用AD590温度传感器完成温度的测量，把转换的温度值的模拟量送入ADC0809的其中一个通道进行A/D转换，将转换的结果进行温度值变换之后送入数码管显示-After the completion of the use of AD590 temperature sensor to measure temperature, the temperature of the analog value to be converted into one of the channel ADC0809 for A/D conversion, the conversion result will be a temperature value converted into digital display