Picture of Really, REALLY Easy USB Motor!
USB 1.jpg
USB 2.jpg
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At long last, my 2nd instructable!!!

This is fan for you or your computer that runs off any avalable USB port. I reccomend it for beginners into electronics, right up to the pro's.

It is easy and fun, you can make in literally five minites!!!

Step 1: Parts and Stuff

Picture of Parts and Stuff
USB 2.jpg
USB 3.jpg
First you'll need to find the parts and stuff.Basicly, you'l need:

1 3-9v motor with blades (out of mini fan) (pictured below (without blades)

1 USB cable (can be ANY of the three types shown below, as long as it has the same wire layout

Some (tiny amount) solder

Switch (optional)

Nescessary tools (wire stripper/cutter, soldering iron, tape)

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janmeshm3 months ago


TECHTRAKER1 year ago


ac1D7 years ago
put 3 motor, no need of resister:)
2 Motors (USB voltage 4.5-5.8).
Musicman415 years ago
you are complaining about your 3 year old computer???  Mine is 5 years old and still works just fine!  Many people in other countries would be glad to have you computer.  You should be thankful for what you have!  You dont need a new computer every year!
chrisg17115 years ago
I am not an electrical engineer,yet this will work. What I am not sure of is the effect on the internal circuitry without voltages being a constant.So in essence, it works, but prolonged usage may have consequences,( unless there is an engineer that can reiterate on this). My modem was overheating, so I placed a USB fan next to it and it works great! Your homemade version is the same thing, except I know that my fan was engineered for this purpose. See attached photo:
RedGuff7 years ago
The computer output is 5V, not 9V.
neardood (author)  RedGuff7 years ago
Sry, my multimetre is screwed up from the cattle prod tazer expirement i did.
childB neardood7 years ago
ha, same. i tried to measure the voltage on a piezo electric sparker... didn't end so well for my $10 multimeter.
neardood (author)  childB6 years ago
lol XD i'l tell you its about a million volts at an extremely low current
I should put a couple billion in parallel and see if my step brother likes it then...
what is the voltage on those things?
umm, if i remember correctly, it's several thousand, and an almost immeasurably low amperage.
awang8 RedGuff6 years ago
Yeah, but 5v is in the 3-9 range isn't it? I'm sure it goes like 3 4 5 6 7 8 9 not just 9.
What he said...
lolcat3607 years ago
i have a 1.5 volt motor and i used a 9 volt battery and it works fine it just goes faster
neardood (author)  lolcat3607 years ago
trust me, if you leave it on it'l eventually get really hot and die
try it.
Ok, Just tried 60V on a 5V motor, Still works fine.
60 volts!!!!!
Yep, 60 Volts Worth of half-dead 9V Batteries.(tested with a multimeter) It spun superfast, and smelled kind of bad, but it still worked :)
anyway it will not die if you put some resistor or make a case to put a 2 AA battery with a motor in it and a fan~~! :)
I have a 1.5 volt motor and 9 volt battery, it used to work, but now it only works with a 1.5 volt battery. And it sometimes needs to be rotated to start the movements.
it seems to be a cheap motor...
neardood (author)  DrCoolSanta7 years ago
joinaqd6 years ago
pretty good i must say..but what if you accidentally stop the fan with your hands?the motherboard will get burned and you cant use ur pc anymore...happened to my laptop when i plugged in my flash drive with twisted leads.my laptop usb drive works nomore.
No, the motherboard will not fry, the usb section has a current limiter, and all of that safety stuff, so that if you were dumb enough to put your hand in the way of the fan in the first place, then it wouldn't cost you a comp.
neardood (author)  joinaqd6 years ago
the fan blades I used were flexible plastic ones that were held out by the centrifuge of the rotating motor shaft.
PKM7 years ago
"Since I used a 3-Volt motor, and the Computer's Output is 9 Volts" I believe the power rail in USB is at 5 volts, not 9, so your 3V fan can probably deal with it for a while at least. If you want it to run slower you might want to put a resistor (a variable resistor would be better) in series with it to limit the voltage.
neardood (author)  PKM7 years ago
good idea. insted of controling the speed with teh computer, u could use a variabble resistor from a radio or something with inbuilt switch 2 vary speed!
controllling the speed with computer?? you nevar said that and theres no vire or chip that doest that, BAD INSTRUCTABLE
Hey, be nice. if you want to critisize, then make it constructive. How do you think that he could improve the instructable with the words: "BAD INSTRUCTABLE?"
neardood (author)  santy227 years ago
its not a bad instructable. it won a prize.
awang8 PKM6 years ago
Don't resistor's limit the current?
PKM awang86 years ago
Erm.. yes and no. People seem to be most familiar with current limiting resistors used with LEDs, but in a circuit with a resistive load like a motor or a lightbulb, they are actually controlling voltage. The current then decreases because of the lower voltage. Your nearest physics or electronics textbook can probably explain it better than I can.
awang8 PKM6 years ago
Hmm.. I'm 10. I wonder where I can... Umm... Borrow... A physics book.
ReCreate awang86 years ago
im sure anyone will be more than glad to let you borrow one
awang8 ReCreate6 years ago
Well, I don't know anyone that has one!
ReCreate awang86 years ago
some teacher at school
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