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.
Two modes of operation:
a: if potentiometer alone, the object is a simple potentiometer drive. 0->100%
b: if DS18B20, the fan or ventilator start threshold is set by temperature set point via the potentiometer.
The maximum output current is 2A (due to the choke), provide a heatsink on the transistor if necessary.
I tried to make the first prototype work with a mosfet.Crashes of measurement readings returned by the DS caused bugs in the behavior of the assembly.
Which, on my side, confirms the reading of the very good following article: https://www.elektormagazine.com/articles/why-do-mosfets-need-drivers/
The assembly consumes about 30mA in its complete version (measurement between 23.6mA -> 29mA)
a: if potentiometer alone, the object is a simple potentiometer drive. 0->100%
b: if DS18B20, the fan or ventilator start threshold is set by temperature set point via the potentiometer.
The maximum output current is 2A (due to the choke), provide a heatsink on the transistor if necessary.
I tried to make the first prototype work with a mosfet.Crashes of measurement readings returned by the DS caused bugs in the behavior of the assembly.
Which, on my side, confirms the reading of the very good following article: https://www.elektormagazine.com/articles/why-do-mosfets-need-drivers/
The assembly consumes about 30mA in its complete version (measurement between 23.6mA -> 29mA)
Updates vom Autor