Just disassembled 2 €5 desk fans because they were shit.. and so is their design apparently.

What I found inside was actually surprisingly simple.. a toddler could build it. It's just a DC motor, a 3PDT switch, DC barrel connector, some wires and screws to hold stuff in place. Oh and the plastic thingie with the fan blades, as well as the USB cable of course.

5 fucking euros. The combined cost of the components would be less than 3, certified motherfuckturers. Time to build it, injection moulding, transportation, sure.. but still.

And if you think that being salty about €5 is cheap shittalk, expand that to every fucking piece of electronics that doesn't cost a small fortune.. at all price ranges. Could be radios, alarm clocks, heck even phones. Shit's way too expensive for what it's worth. Perhaps because so many people in the industry are just here for a quick buck.. motherfuckers 😒

Anyway, back to the design.. the hole in the fan blade thingie is supposed to get the motor's shaft shafted in, to turn the blades. I'd use glue there.. but not these designers. They just shove it in and hope that friction takes care of everything. And one of the fan blade modules' hole was so wide that inserting the motor is like throwing a sausage down the hallway. No contact at all! Make it tight already like the Chinese designer's glory-...
Nah let's not get into Chinese tightness just yet.

Oh and also a resistor for slow mode. Consumes just as much power except the fan turns slower. Because fuck efficiency, right?

Goddammit, next time I'm just gonna build my own again.. at least that wouldn't be a certified piece of shit 😑

Hey guys.
Got this motor here... What do you think it's voltage is?
Tryed 12v, didn't even move...

How to spend more time writing docs then code?
15m = doc
1m = code

<code>
/* Motor DC + Mosfet IRF520 + Servo
Materials:
IRF520 (Mosfet) + Dc motor + Batery (3V min)
diode (1N4007?)
Changed Tip122 for IRF520: Tip122 has less resistance and produces more heat

Hardware:
ARDUINO = A(port , 5V , GND)
MOSFET = M(A[port] , + , GND)
MOTOR = MOTOR(+ , -)
BATERIA = BAT(+ , -)
DIODO = D(sinal_1 , sinal_2)

MOSFET
M(port) = A(port)
M(+) = D(sinal_1) AND MOTOR(+)
M(GND) = A(GND)

D(sinal_2) = B(+) AND MOTOR(-)

ARDUINO
A(port) = M(port)
5V = null
A(GND) = M(GND) AND BAT(-)

*/

#define motorPIN 8 // A(port)
int loopy = 0; // Loop variable to limit de program

void setup()
{
// Initialize the motor pin as an output:
pinMode(motorPIN, OUTPUT);

}

void loop() // 1 loop == 100ms
{
if (loopy < 10) // Turns motor ON for 1 second
{
digitalWrite(motorPIN, HIGH);
}
else // Turns motor OFF
{
digitalWrite(motorPIN, LOW);
}
}

</code>

What's the most efficient motor driver for a small DC motor that I want to run off a 5V source for aurdino?

I previously had a L293D and it was inefficient as fuck, it got so hot that almost burnt my finger, (ran it from a 12V supply) and it dropped a good 2 volts from power supply to motor.

Is there a good enough off the shelf driver or do I have to make a H-bridge myself using MOFSETs?

Is connecting your aurdino and motors that it'll drive (through a motor driver of course) to the same battery bad for the aurdino?
I mean those are small DC brushed motors, will the noise/fluctuatuons they generate harm the aurdino in the long run?

Went to visit a friend at a junkyard I worked for 6 months and brought some stuff I found there...
I new there was a DC motor on this piece... And what a goodie. To bad I only brought 3 hehehe

Want to meet my new project?
A old dead niko... Already rools, next, direction