Meadow.Foundation.Motors.Stepper.A4988

A4988
Status
Source code	GitHub
Datasheet(s)	GitHub
NuGet package

Code Example

private A4988 a4988;

public override Task Initialize()
{
    a4988 = new A4988(
        step: Device.Pins.D01,
        direction: Device.Pins.D00,
        ms1Pin: Device.Pins.D04,
        ms2Pin: Device.Pins.D03,
        ms3Pin: Device.Pins.D02);

    return base.Initialize();
}

public override Task Run()
{
    var stepDivisors = (StepDivisor[])Enum.GetValues(typeof(StepDivisor));
    while (true)
    {
        foreach (var step in stepDivisors)
        {
            for (var d = 2; d < 5; d++)
            {
                Resolver.Log.Info($"180 degrees..Speed divisor = {d}..1/{(int)step} Steps..{a4988.Direction}...");
                a4988.RotationSpeedDivisor = d;
                a4988.StepDivisor = step;
                a4988.Rotate(180);

                Thread.Sleep(500);
            }
        }
        a4988.Direction = (a4988.Direction == RotationDirection.Clockwise) ? RotationDirection.CounterClockwise : RotationDirection.Clockwise;
    }
}

Sample project(s) available on GitHub

Wiring Example

To wire a A4988 to your Meadow board, connect the following:

A4988	Meadow Pin
GND	GND
VCC	5V
STEP	D01
DIRECTION	D00
M1	D04
M2	D03
M3	D02

It should look like the following diagram:

Class A4988

This class is for the A4988 Stepper Motor Driver

Assembly: A4988.dll

View Source

Declaration

public class A4988 : IDisposable

Implements:
System.IDisposable

Properties

StepAngle

Gets or sets the angle, in degrees, of one step for the connected stepper motor

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Declaration

public Angle StepAngle { get; set; }

RotationSpeedDivisor

Divisor used to adjust rotational speed of the stepper motor

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Declaration

public int RotationSpeedDivisor { get; set; }

Direction

Sets or gets the direction of rotation used for Step or Rotate methods

View Source

Declaration

public RotationDirection Direction { get; set; }

StepDivisor

Divisor for micro-stepping a motor
This requires the three micro-step control lines to be connected to the motor

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Declaration

public StepDivisor StepDivisor { get; set; }

StepsPerRevolution

Gets the number of steps/micro-steps in the current configuration required for one 360-degree revolution

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Declaration

public int StepsPerRevolution { get; }

IsDisposed

Is the object disposed

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Declaration

public bool IsDisposed { get; }

Methods

Rotate(float, RotationDirection)

Rotates the stepper motor a specified number of degrees

View Source

Declaration

public void Rotate(float degrees, RotationDirection direction)

Parameters

Type	Name	Description
System.Single	degrees	Degrees to rotate
Meadow.Peripherals.RotationDirection	direction	Direction of rotation

Rotate(float)

Rotates the stepper motor a specified number of degrees

View Source

Declaration

public void Rotate(float degrees)

Parameters

Type	Name	Description
System.Single	degrees	Degrees to rotate

Step(int, RotationDirection)

Rotates the stepper motor a specified number of steps (or microsteps)

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Declaration

public void Step(int count, RotationDirection direction)

Parameters

Type	Name	Description
System.Int32	count	Number of steps to rotate
Meadow.Peripherals.RotationDirection	direction	Direction of rotation

Step(int)

Rotates the stepper motor a specified number of steps (or microsteps)

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Declaration

public void Step(int count)

Parameters

Type	Name	Description
System.Int32	count	Number of steps to rotate

Dispose()

Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.

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Declaration

public void Dispose()

Dispose(bool)

Dispose of the object

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Declaration

protected virtual void Dispose(bool disposing)

Parameters

Type	Name	Description
System.Boolean	disposing	Is disposing

Implements

• System.IDisposable