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-AD590 temperature sensor using the measured temperature to complete the conversion of analog temperature ADC0809 into one of channels A/D conversion, the result will be converted to temperature after transformation into a digital display