I have a small DC motor but it won't work

Using Arduino Motors, Mechanics, Power and CNC
1

I have a DC motor and I want it to turn on a very simple need, but I tried a lot of stuff but it won't work, I hooked the motor up to a small battery and it worked fine, so something is off with my code, can someone help me?
Code:

const int motorPin1  = 9;

void setup() {
  pinMode(motorPin1, OUTPUT);

}

void loop() {

}
2

Likely not only that.
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1 Like
3

Are you trying to power the motor with an Arduino pin? That will not work. You need a transistor or motor driver to power the motor with an external power supply.

transistor motor drivers
transistor motor drivers1605×570 47.1 KB

You need a digitalWrite() to change the state of the pin. The default state of an output pin is LOW.

1 Like
4

Will a relay work?

5

Yes, but the relay must be driven by a transistor because a pin can't, directly, drive a relay either. The external power will be required for the relay coil, too. A relay takes a certain amount of current to hold it closed. It will draw that current all the time that is is closed.

A transistor driver draws much less current and the MOSFET draws nearly 0 current.

A relay cannot accept PWM for motor speed control. A transistor or motor driver can.

So, yes, a relay will work. It is less efficient and practical, though.

6

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