系统启动，通过“加1按键、减1按键、确认按键”来设置温度的上限值和下限值。设置完成后数码管实时显示当前的温度。当温度低于下限温度，1号LED和蜂鸣器持续一种频率声光报警；当温度高于上限温度，2号LED和蜂鸣器持续以另一种频率声光报警。提供电路图。-System startup, minus 1 "plus a button, button, confirmation button" to set the upper limit and lower limit of the temperature. After the completion of digital tube displays the current temperature in real time. When the temperature below the lower limit temperature, the 1st LED and buzzer continued to a frequency of sound and light alarm　2 LEDs and buzzer when the temperature is higher than the upper limit temperature, continues to another frequency sound and light alarm. Provide circuit.