You can create multiple stepper motor objects with different names and pins. This allows you to easily control 2 or more stepper motors at the same time.
In the setup, you can set the speed in rpm with the function setSpeed rpm. The maximum speed for a 28byj stepper motor is roughly rpm at 5 V. In the loop section of code, we simply call the step steps function which turns the motor a specific number of steps at a speed determined by the setSpeed rpm function. Passing a negative number to this function reverses the spinning direction of the motor.
In the following three examples I will show you how you can control both the speed, the direction and the number of steps the stepper motor should take. In these examples I will be using the AccelStepper library. One of the advantages is that it supports acceleration and deceleration, but it has a lot of other nice functions too. You can download the latest version of this library here or click the button below.
The Library Manager will open and update the list of installed libraries. Select the latest version and then click Install. The following sketch can be used to run one or more stepper motors continuously at a constant speed.
No acceleration or deceleration is used. The statement define is used to give a name to a constant value. The compiler will replace any references to this constant with the defined value when the program is compiled.
So everywhere you mention motorPin1 , the compiler will replace it with the value 8 when the program is compiled. The next step is to specify the motor interface type for the AccelStepper library. You can find the other interface types here. If you want to run the motor in full-step mode fewer steps per revolution , just change the 8 to 4.
Next, you need to create a new instance of the AccelStepper class with the appropriate motor interface type and connections. To get the correct step sequence, we need to set the pins in the following order: motorPin1, motorPin3, motorPin2, motorPin4. Speeds of more than steps per second can be unreliable, so I set this as the maximum. If you have multiple stepper motors connected, you can specify a different speed for each motor: stepper2.
In the loop, we first set the speed that we want the motor to run at with the function setSpeed. This depends on the set speed and the time since the last step. If you want to change the direction of the motor, you can set a negative speed: stepper. The first part of the code up to the loop section is exactly the same as in the previous example. In the loop I make use of a while loop in combination with the currentPosition function.
First, I set the current position of the stepper motor to zero with stepper. Next, we make use of the while loop. A while loop will loop continuously, and infinitely, until the expression inside the parenthesis, becomes false. Remember that 0 is the first value in the array we call coil1. The first entry in the array coil1[] is the integer 0, so the IN1 is driven low.
The function continues to digitalWrite IN2, coil2[d] ; since the integer d is still 0. The first element in the array coil2[] is the integer 0. When the function motorDrive completes the program, it returns to where it was when the function was first called. If the upButton is still depressed, the variable coilStep is incremented by 1. If the downButton is depressed, the variable coilStep is reversed. If no buttons are pressed, the function motorDrive sends the integer 8.
The eighth entry in all the arrays are low, stopping the stepper motor and the function goes on. Hi, great article, however I think your code is flawed as you increment coilStep and then use it as an array index, but only later do you check that the index was with in the bounds of the array. Your email address will not be published. Save my name, email, and website in this browser for the next time I comment.
Notify me of follow-up comments by email. Notify me of new posts by email. I agree to these terms. Consent to store personal information: I agree to let Circuit Basics store my personal information so they can email me the file I requested, and agree to the Privacy Policy. Email me new tutorials and very occasional promotional stuff: Yes No. It covers all of the steps, diagrams, and code you need to get started. Next 2. Related Posts. You must have JavaScript enabled in your browser to utilize the functionality of this website.
Are you a starter with Croduino? Or a newbie when it comes to electronics? You fancy a specific module, but you don't know how to use it? Don't worry, we have our How To Use series! How to Use is a series of blog tutorials by e-radionica where you will find everything you need to begin working with your favorite modules. Tutorials include technical characteristics, operating principles, instructions on how to connect the module with Croduino and basic coding. Everything else is up to you and your imagination.
Let's face it, motors can be found in various devices that we use every day. The Arduino Stepper Library is perfectly adequate for simple, single motor applications.
So, for our next experiment we will make use of an advanced stepper motor library called AccelStepper library. It significantly improves on the standard Arduino Stepper library in several ways:.
Click on the first entry, and then select Install. Once the motor makes one revolution, it changes the spinning direction. And it keeps doing that over and over again. Now as we are going to drive our motor at full steps, we will define a constant for this. If you want to drive the motor at half steps, set the constant to 8. In the setup function we first set the maximum speed of the motor to a thousand which is about as fast as these motors can go.
We then set an acceleration factor for the motor to add acceleration and deceleration to the movements of the stepper motor. In the loop function, we use an If statement to check how far the motor needs to travel by reading the distanceToGo property until it reaches the target position set by moveTo. Once distanceToGo reaches zero we will move the motor in the opposite direction by changing the moveTo position to the negative of its current position.
This is the most important function, because the stepper will not run until this function is executed. For our next experiment, we will add a second 28BYJ stepper and ULN driver set to our Arduino to drive two motors simultaneously.
0コメント