temperature_driven_fan

It is all about the software design curriculum. Detailed information is provided as below.

Software/IDE

start the fan when the temperature is higher than a specified threshold
distinguish the fan speed when temperature varies
display temperature and fan speed in the lcd
record the times when the fan starts to work and corresponding time, and the records can be reviewed in the lcd

!!! It is all about simulation, all so called hardwares are merely involved in the simulation.
In the final design, the fan is simulated with a speaker. And the frequency represents the speed of the fan. So if you really want to drive a fan, do it youself after refering to my design.
The time involved with the recording of the fan is also simulated, I do not really access the acute time using the clock.
The display of the temperature is slightly unstable, maybe later I will fix it(maybe never).