N20 Motor Not Starting After Connecting to Arduino 3.3V and GND Pins—Possible Damage?

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Motor likely damaged by direct Arduino power connection
#1 21684776 21 Jul 2020 03:32

david lopez david lopez

Anonymous

Motor likely damaged by direct Arduino power connection
Post #1 21684776 21 Jul 2020 03:32

I connected a hobby electric motor to an arduino. One lead was connected to a pin labeled 3.3 volt and the other lead was connected to a ground pin. I did not connect the electric motor to a digital input/output pin. I did not connect the electric motor to an analog pin. The electric motor stopped working. I tried connecting the motor to a 4 battery. The motor would not start. The motor was rated 3 volt to 5 volt. Why is the motor not starting?
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#2 21684777 21 Jul 2020 12:41

Giovanni Di Maria Giovanni Di Maria

Anonymous

Post #2
21684777 21 Jul 2020 12:41

Is it a stepper motor, normal motor or servo?If the motor is a normal motor, probably a wire is broken.In every case, you must drive a motor with high current, through a MOSFET or transistor, not with Arduino or MCU directly.RegardsGiovanni
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#3 21684778 21 Jul 2020 12:55

david lopez david lopez

Anonymous

Post #3
21684778 21 Jul 2020 12:55

the n20 motor is a normal motor. I connected the motor to a 3.3 volt pin. initially the motor worked every time I connected the motor to a 3.3 volt pin. then the motor stopped working. the motor worked at first.
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#4 21684779 21 Jul 2020 16:50

Faisal amjad Faisal amjad

Anonymous

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Post #4 21684779 21 Jul 2020 16:50

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Suggesting resistance and current tests for the N20 motor
#5 21684780 24 Jul 2020 00:39

John David Heinzmann John David Heinzmann

Anonymous

Suggesting resistance and current tests for the N20 motor
Post #5 21684780 24 Jul 2020 00:39

An n20 motor looks, on Google, to be a brushed DC gear motor. I would not expect the 3.3 V supply of an Arduino to be capable of burning out such a motor. A battery could though, for example if the motor shaft was restricted from turning and left connected to the motor. Can you check the resistance of the motor with an ohm meter? If it is very high, it is probably burned out or has a loose connection inside (or a problem with one of its brushes not contacting the commutator). If the resistance is low, check the current when connected to the battery. If there is current flowing, perhaps the motor is jammed (a problem in the gearbox?) Can the motor be rotated by hand? Best, -JD
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#6 21684781 24 Jul 2020 01:50

david lopez david lopez

Anonymous

Post #6
21684781 24 Jul 2020 01:50

I am not sure I can find the motor. I probably lost it.
#7 21684782 27 Jul 2020 13:44

luckyliu liu luckyliu liu

Anonymous

Post #7
21684782 27 Jul 2020 13:44

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#8 21684783 12 Aug 2020 13:42

ammar son ammar son

Anonymous

Post #8
21684783 12 Aug 2020 13:42

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Topic summary

A hobby N20 brushed DC gear motor rated for 3 to 5 volts was connected directly between an Arduino 3.3V pin and ground without using a digital or analog I/O pin. Initially, the motor operated but then stopped working and failed to start even when powered by a 4-cell battery pack. The motor is a normal brushed DC type, not a stepper or servo. Directly powering motors from Arduino pins is discouraged due to insufficient current capacity and risk of damage. Possible causes for the motor failure include internal wiring breakage, brush or commutator issues, or mechanical jamming in the gearbox. Measuring the motor’s resistance with an ohmmeter can help diagnose if the motor is burned out or has loose internal connections. If resistance is low but the motor does not turn, the gearbox may be jammed. The Arduino 3.3V supply is unlikely to damage the motor, but a battery could cause damage if the motor shaft was prevented from turning while powered. Proper motor driving requires a transistor or MOSFET to handle higher current loads safely.
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N20 Motor Not Starting After Connecting to Arduino 3.3V and GND Pins—Possible Damage?

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Topic summary