So I am new to Arduino and new to electronics in general. I've looked up a few tutorials and they all have a simple early tutorial that turns on a DC motor and turns it off again. Something like this:
The transistor I am using is a 2N2222 and the motor is a little 3V DC toy motor.
The problem is that the when I use this circuit, the motor barely turns (I need to give it a little help to get it it moving). I know my code is right (motor is on for 5 seconds, off for 1). i can tell this is working but clearly something is not right.
I am powering the Arduino off the USB port.
As a test, I swapped out the 2.2K Ohm resistor for a 560 Ohm resistor and the motor seems to run fine. However, it creeps during the "off" time (the motor is not under any load). Also, the transistor gets very hot after about a minute of running this loop.
So my questions are:
Why does the motor not work when I use the 2.2K Ohm resistor when I see that 2.2K Ohm resistor in different circuit diagrams that demonstrate this type of circuit?
Why does changing to the 560 Ohm have the effect that it does
Why does the motor creep during the off cycle when using the 560 Ohm?
Why does the transistor get so hot using the 560 Ohm resistor?
Finally, sometimes as a test, to simple try to turn turn the motor on, I will just reroute to pin 9 wire directly to the Arduino 5V on my breadboard (bypassing Arduino control altogether). Is there any reason this is a bad idea?
I am anticipating questions about current draw but my multimeter maxes out at 200mA; I am getting a new one that goes to 10A and will help me see how much I am drawing.
Thanks in advance of any help. I have tried to be clear and concise so hopefully this does not elicit any snark. If there are any resources to point me to, I would be happy to hear them.