You may download this code (Arduino Sketch) from here. Use the colors of the leads to identify them, not the position from which they emerge from the motor. ULN2803 is a high current, high voltage IC, used to drive high power loads upto 500mA/50V such as relays, motors etc. This 5th wire is to allow current on coils to flow in two directions 1.2 ULN2803 IC: The stepper motor, which we have used has 5 wires, implying that it is to be run as a unipolar stepper motor. In bipolar stepper motors, there are arrangements of 4 wires. The difference between the two types is the voltage levels.Ī unipolar stepper motor only operates with positive voltage, so the high and low voltages applied to the electromagnetic coils would be something like 5V and 0V.Īnd a bipolar stepper motor has two polarities, positive and negative, so its high and low voltages would be something like 2.5V and -2.5V.ĭifferent types of Stepper Motors have different numbers of wires like 4,5,6,8. There are two types of Stepper motors: Unipolar and Bipolar. The only drawback of step motor is, they are little bit harder to control than other motors and servo motors. They have the advantage that they can be positioned accurately and you can control over the movement. Servo motors are usually limited to 0-180 degree rotation, while a stepper motor can rotate continously like dc motors. Stepper motors fall somewhere in between a regular DC motor and a servo motor. In this tutorial, we have explained how to interface Step Motor 28BYJ-48 with Arduino UNO using ULN2803. These motors have multiple coils that are organised in group which is known as phase. Stepper motors are like DC motors, which is used to move in steps. This tutorial of Robo India explains how to drive Stepper Motor Using ULN2803 with Arduino UNO.
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