用两个温度传感器，一个用来探测当前空气温度，另一个用于探测热源的温度；根据两处温度的变化来开启或关闭两个继电器(1号、2号)。



CPU=热源温度，T=当前空气温度，S1=1号继电器，S2=2号继电器



一、当T>15度时

1、CPU >= T，开启s1,s2

2、T-10 < CPU <= T - 5度时，关闭S1；

3、CPU <= T - 10度时，关闭S2；

注：当CPU温度下降至S1、S2全关闭后，再上升至CPU >= T，继电器才工作。



二、当T<=15度时

1.CPU <= 5度,关闭S1，S2；

2.CPU > 15度,开启S1,S2

3.CPU 在5到15度之间，S1、S2保持原状态。



三、1602屏显示格式为:

T:25℃ S1:OFF或ON

CPU:20℃ S2:OFF或ON



四、两只DS18B20中任何一只出问题，LCD对应显示温度处会显示“!!”、且不会进行温度比较



五、工作温度范围为：0～99度（包括0和99度）。当超过此范围，LCD对应处显示“ ”、且不会进行温度比较



六、继电器接口为低电平有效-With two temperature sensor, a used to detect the current air temperature, another is used to detect the temperature of the heat source According to the change in temperature two place to open or close the two relay (1, 2).

　　　

CPU = heat source temperature, T = the current air temperature, S1 = 1, relay, relay S2 = 2





A, when T > 15 degrees

1, CPU > = T, open the s1, s2

2, T- 10 < < CPU close the S1 = T- 5 degrees

3, CPU < = T- 10 degrees, close the S2

Note: when the CPU temperature dropped to S1, S2 is turned off, and then rose to CPU > = T, relay work.





Second, when T < = 15 degrees

1. The CPU < = 5 degrees, shut off the S1, S2

2. The CPU > 15 degrees, open the S1, S2

3. The CPU between 5 to 15 degrees, S1, S2, maintain the original state.





Three, 1602 display format for:

T: 25 ℃ S1: OFF or ON

CPU: 20 ℃ S2: OFF or ON





Four, two any one problem in the DS18B20, LCD display temperature place will show　!!!!!!!!!! And will n