Using the Arduino pin to control the base of the transistor ensures that a small current from the digital pin of the Arduino can control a much larger current of the motor. We have used a transistor because the motor may demand much higher current than what a digital pin of the Arduino can handle. The base of this transistor is connected to pin 11 of Arduino via a resistor, while the emitter is connected to GND. Circuit DiagramĪ simplified version of the circuit diagram is shown below −Īs you can see, one terminal of the motor is directly connected to +5V, while the other is connected to the Collector of the PN2222 transistor. At the end of this article, I’ll provide links to some tutorials which explain the direction reversing of DC motors.Īlright, so let’s begin with the circuit diagram.
We won’t be looking at reversing the direction of the motor, as that will require an additional IC (an H-bridge).
#DC MOTORS ARDUINO HOW TO#
In this article, we will see how to interface a DC Motor with Arduino and control its speed. If the voltage across the terminals is reduced, the motor speed will reduce accordingly. When connected with a battery the motor will rotate, and if the connections are reversed, the motor will rotate in the opposite direction. A DC Motor is the simplest kind of motor.
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