Create device for control of fan speed. 4 levels of speed. speed switching in manual mode with two.....?

Create device for control of fan speed. 4 levels of speed. speed switching in manual mode with two buttons - up and down. switching on the fan if the temperature is higher than settled, 4 different levels of switching temperature must be chosen by buttons, automatic increase of fan's speed every 10 minute, if... show more Create device for control of fan speed. 4 levels of speed. speed switching in manual mode with two buttons - up and down. switching on the fan if the temperature is higher than settled, 4 different levels of switching temperature must be chosen by buttons, automatic increase of fan's speed every 10 minute, if temperature do not decrease, do not use micro-controllers or other programmable devices.
Update: (this is just a mini project)
2 answers 2