How can I control two fans based on temperature using aurdino nano
Much the same way that you'd control one fan?
Perhaps give some more detail on what you're trying to do, and where you're stuck ...
Hi, @revanthganesh
Welcome to the forum.
Can you please tell us your electronics, programming, arduino, hardware experience?
Thanks... Tom... 
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My idea is to create a neck fan .But I want to make it in a new way.l want to introduce a new feature to that neck fan as it should work automatically based on temperature.I am getting many articles about controlling one fan with temperature.but when it comes to neck fan I have to implement it to two fans.Even if I use seperate aurdino's and seperate sensors,it becomes more complex wiring and not much suitable for neck fan,at the same time both fan's speed should be the same in response to one sensor with one aurdino.
So I conclude what I am looking for is ,to control two fans with same aurdino,and same sensor at a time,as it should better fit for the concept what I am thinking about neck fan.
A what?
To control two fan based on temperature with aurdino for neck fan
Still don't know what you mean by, "neck fan".
It is a device which will be weared on neck like Bluetooth neck band,it will have button to start and buttons to control its speed,it is for the purpose of colling in hot environments mainly in summer season.it will blow air to provide cooling effect.as I want to replace that button with automatic temperature control same like temperature fan
Check the transistor ratings, but why not just connect the 2nd fan in parallel with the first?
Is this where you found that diagram?
This is the site I found that image,but I think your answer is satisfying and I have to try it.
Thank you
So will I have to wear a big power pack on my belt to run this whole set-up?
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