Variateur for 12V ventilator or Fan

The basis of this assembly is taken from the article “Wind of freshness with ATtiny” Elektor N°456, page 37. Refer to this article for additional information. Code to drive a fan or a 12V fan in PWM We will detect the presence or not of a DS18B20 which will have the effect of initializing the type of operation (a or b) If a DS18B20 is connected to the card, the info LED lights up for about 4s, it is mode b. No DS detected, we are in mode a, drive alone.