Diy temperature controlled fan using arduino

componets:-
1)arduino board
2)12v dc fan
3)ntc thermistor
4)bc547 transistor
5)1k resistor
6)10k resistor
7)breadboard
8)jumper cables

thanks for watching
=======================

[Toro-Tor]

Using a cap to remove that hissing noise from the fan when its not at 100% PWM = very good idea, THANK YOU !
However, the cap is very much related to each application - You have to experiment with the cap until you find one that takes the noise away but still lets it work on various PWM. If i put a 470uf as suggested, my fan just blows full-speed when its supposed to go half-speed. So now I´m using only 47uf and its perfect for 3 different speeds, no noise.
Probably one could determine mathematically which cap is the right one ... but I don´t know how to calculate that

[MRTZ]

Can i control the pwm with this circuit? Because mine is only turning on and off. I want the fan slowly build up from 25%, 50%, 75% and 100% duty cycle. When i measure the output with a oscilloscope i get a 25%, 50%, 75% and 100% duty cyle but the fans are not moving untill they reach 96% dutycyle. I use a 2 wired 24 fan

[thisfeatureisbad]

So I have put a capacitor between the fan + and -. Can something happen to the capacitor if I leave the fan at the full speed for long?I want to make a controller for my PC case fans.

[robmormile]

is the 470uf cap relative to the current draw of the fan. If so what cap would be needed for 4 fans in parallel at 80mA each (320ma)

[Chris-rspp]

hey, im trying this but instead using bc547, im using C1815. is it okay or nay?

[hemanthkumarr]

Can u modifi this circuit with button and oled display to set different temp and show temperature

[abanki]

what if I use a 24v fan and power supply? Still same components work.

[likeelijah]

How sensitive and accurate is the thermistor

[janexavier]

How to give the 12V supply and from where, can you please explain.

[hamzaqureshi]

The thermosistor I have has 3 wires, how to I wire them?

[janexavier]

Mine is not working can you help me? I checked every connection and coding but still not working?

[badhonlab]

i didn't finde code please help me

[landavid]

Im alrdy follow exactly what you did in this video but also cant coding the arduino.