通常改变阻值是通过可变电阻人工调节，现在用DS2890通过程序来控制DS2890的阻值，不再用人工的方法，具有准确、简单的效果。-Often change resistance is through the variable resistor artificially adjustment, now DS2890 through with DS2890 procedures to control the resistance, no longer use artificial method, h

PIC 16F628A Dallas DS18S20 Tempregulator ext. Vin (0V=20C/5V=40C) or local DS2890 Serial out for log 7-Seg Temp display Current & Set