stc12c5a60s2芯片通过ds18b20测量温度值并通过数码管显示。同时根据温度值改变pwm波控制直流电机转速(The stc12c5a60s2 chip was measured by ds18b20 and displayed through a digital tube. At the same time, the PWM wave control dc motor speed is controlled according to the temperature value)