![]() ![]() #define motorPin3 6 // Yellow - 28BYJ48 pin 3 #define motorPin2 5 // Pink - 28BYJ48 pin 2 #define motorPin1 4 // Blue - 28BYJ48 pin 1 NOTE: May need separate +5 power supply to power motors Motors accelerate and decelerate simultaneously in opposite rotations Runs two 28BYJ-48 stepper motors with AccelStepper Library. Using the AccelStepper library we can accelerate and decelerate stepper motors. Small_tSpeed(1000) // 2000 a good max speed? Steps2Take = - STEPS_PER_OUTPUT_REVOLUTION / 2 // Rotate CCW 1/2 turn Steps2Take = STEPS_PER_OUTPUT_REVOLUTION / 2 // Rotate CW 1/2 turn Small_tSpeed(5) // SLOWLY Show the 4 step sequence Nothing (Stepper Library sets pins as outputs) Stepper small_stepper(STEPS_PER_MOTOR_REVOLUTION, 8, 10, 9, 11) #define STEPS_PER_OUTPUT_REVOLUTION 32 * 64 Number of steps per revolution of OUTPUT SHAFT (= gear reduction 2048 steps) Number of steps per revolution of INTERNAL motor in 4-step mode move faster the higher the value from the potentiometer * Stepper Unipolar AdvancedĭigitalWrite(motorPins, count2>count&0x01) This will be used to change the speed of the stepper motor. ![]() * - red: power connector, I have it at 5V and works fineĬonnect a >10k Ohm potentiometer between +5V and GND with the slider connected to pin A0. * It is a unipolar stepper motor with 5 wires: * per winding, with center taps brought out to separate leads " * made by Copal Electronics, with 1.8 degrees per step and 96 ohms * according to the documentation I found, this stepper: " motor * Program to drive a stepper motor coming from a 5'25 disk drive If the stepper motor vibrates instead of rotates, you may need to change the wiring sequence. If you use a different stepper motor requiring an external power source you may need to wire differently like in the picture below. The 28BYJ-48 stepper motor plugs straight into the connector. The advantage of the below board is that all 7 inputs (IN1.7) and all 7 outputs (A.G) of the ULN2003A are accessible. You can use these boards to drive DC motors or unipolar stepper motors. These are the two most common ULN2003A driver boards. Wiring diagram for this model unipolar 5 wire stepper motor:
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