• Serial Control In Library
• Arduino Stepper Motor Library Commands

The disadvantage of using the built-in stepper Arduino library for 28BYJ-48 is that there’s no option to change the stepping mode as it defaults to wave drive only. Also, the built-in library is limited to one stepper motor. To tell the Arduino Stepper library which pins are connected to the motor controller, the following command is used: Stepper motor(768, in1Pin, in2Pin, in3Pin, in4Pin); Stepper motor(768, in1Pin, in2Pin, in3Pin, in4Pin); The first parameter is the number of 'steps' that the motor will take to complete one revolution.

Hello,

I am trying to control a stepper motor going a certain amount of steps/second using the AccelStepper library. However, I cannot figure out how to do this while also stopping the while loop I have. I tried several different methods, but the code I have now seems to work, but I wish the speed was faster. With the counter I have, I cannot control the speed, but at least I can get it to stop after an alotted amount of time. If you guys have any suggestions on how to both control the speed and stop the motor after a set time, let me know! The Arduino is put to use when a robot arm moves over a scanner with the letter 'A,' just as a little background as to why I have all the ethernet stuff.

#include <SPI.h>

#include <Ethernet.h>

#include <AccelStepper.h>

#include <assert.h>

// Allows motor control via the controller through ports 7 and 6.

AccelStepper stepper(AccelStepper::DRIVER,7,6);

// the media access control (ethernet hardware) address for the shield:

byte mac[] = { 0x90, 0xA2, 0xDA, 0x10, 0xF4, 0x4E };

byte ip[] = { 192, 168, 0, 211 };

byte server[] = { 192, 168, 0, 202 };

int p = 0;

EthernetClient client;

void setup() {

Ethernet.begin(mac, ip);

Serial.begin(9600);

delay(1000);

stepper.setMaxSpeed(1000);

stepper.setSpeed(250);

Serial.println('connecting..');

if (client.connect(server, 23)) {

Serial.println('connected');

client.println();

} else {

Serial.println('connection failed');

}

}

void loop() {

if (client.available()) {

char I5 = client.read();

Serial.print(I5);

while (I5 = 'a'){

stepper.runSpeed();

p = p+1;

Serial.println();

Serial.println(p);

if(p 10000){

assert(0);

}

}

}

if (!client.connected()) {

Serial Control In Library

Serial.println();

Serial.println('disconnecting.');

client.stop();

for(;;)

;

}

}

Arduino Stepper Motor Library Commands

Stepper One Revolution

Stepper motors, due to their unique design, can be controlled to a high degree of accuracy without any feedback mechanisms. The shaft of a stepper, mounted with a series of magnets, is controlled by a series of electromagnetic coils that are charged positively and negatively in a specific sequence, precisely moving it forward or backward in small 'steps'.

There are two types of steppers, Unipolars and Bipolars, and it is very important to know which type you are working with. For each of the motors, there is a different circuit. The example code will control both kinds of motors. See the unipolar and bipolar motor schematics for information on how to wire up your motor.

In this example, the shaft does a full rotation clockwise, doing the number of stepper motor using the Arduino Stepper Library. The stepper is controlled by with digital pins 8, 9, 10, and 11 for either unipolar or bipolar motors.

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The Arduino or Genuino board will connect to a U2004 Darlington Array if you're using a unipolar stepper or a SN754410NE H-Bridge if you have a bipolar motor.

For more information about the differences of the two types, please take a look at Tom Igoe's page on stepper motors.

Hardware Required

• Arduino or Genuino Board
• stepper motor
• U2004 Darlington Array (if using a unipolar stepper)
• SN754410ne H-Bridge (if using a bipolar stepper)
• power supply appropriate for your particular stepper
• hook-up wires
• breadboard

Circuits

Below you'll find circuits for both unipolar and bipolar steppers. In either case, it is best to power your stepper motors from an external supply, as they draw too much to be powered directly from your Arduino or Genuino board.

Note: Both circuits below are four wire configurations. Two wire configurations will not work with the code provided.

Unipolar Stepper Circuit and schematic

Unipolar Motor Knob Circuit

image developed using Fritzing. For more circuit examples, see the Fritzing project page

Unipolar Motor Knob Schematic

Bipolar Stepper Circuit and schematic

Bipolar Motor Knob Circuit

image developed using Fritzing. For more circuit examples, see the Fritzing project page

Bipolar Motor Knob Schematic

Code

For both unipolar and bipolar steppers

See also

• Stepper myStepper = Stepper(steps, pin1, pin2, pin3, pin4)
• stepper.setSpeed()
• stepper.step()
• MotorKnob - Moves the shaft according to the position of the knob of a potentiometer.
• StepperOneStepAtATime - Single stepping to check the proper wiring of the motor.
• StepperSpeedControl - The stepping speed is controlled by a potentiometer.

Last revision 2018/08/23 by SM