1) use buzzer as electroacoustic element; Alarm indicator light emitting diode;

(2) when the temperature within the scope of 10 degrees to 30 degrees Celsius alarm system is not sound, when the temperature is not in the range, the alarm sound, and according to the different tones to distinguish between temperature, namely:

? When the temperature above 30 degrees Celsius, the alarm of two frequency exchange "di - du" sound,

? When the temperature below 10 degrees Celsius, the single frequency noise from the alarm

(3) temperature sensor output voltage can be simulated by dc sources, to 0 degrees Celsius to 0 mv, each rise 1 degrees Celsius temperature, increasing 2 mv,