Visual Basic .NET - LED Strip Bricklet

This is the description of the Visual Basic .NET API bindings for the LED Strip Bricklet. General information and technical specifications for the LED Strip Bricklet are summarized in its hardware description.

An installation guide for the Visual Basic .NET API bindings is part of their general description.

Examples

The example code below is Public Domain (CC0 1.0).

Simple

Download (ExampleSimple.vb)

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Imports System
Imports Tinkerforge

Module ExampleSimple
    Const HOST As String = "localhost"
    Const PORT As Integer = 4223
    Const UID As String = "XYZ" ' Change XYZ to the UID of your LED Strip Bricklet

    Sub Main()
        Dim ipcon As New IPConnection() ' Create IP connection
        Dim ls As New BrickletLEDStrip(UID, ipcon) ' Create device object

        ipcon.Connect(HOST, PORT) ' Connect to brickd
        ' Don't use device before ipcon is connected

        ' Set first 10 LEDs to green
        ls.SetRGBValues(0, 10, _
                        new Byte(){0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, _
                        new Byte(){255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 0, 0, 0, 0, 0, 0}, _
                        new Byte(){0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0})

        Console.WriteLine("Press key to exit")
        Console.ReadLine()
        ipcon.Disconnect()
    End Sub
End Module

Callback

Download (ExampleCallback.vb)

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Imports System
Imports Tinkerforge

Module ExampleCallback
    Const HOST As String = "localhost"
    Const PORT As Integer = 4223
    Const UID As String = "XYZ" ' Change XYZ to the UID of your LED Strip Bricklet
    Const NUM_LEDS As Integer = 16

    Dim rIndex As Integer = 0
    Dim r() As Byte = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}
    Dim g() As Byte = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}
    Dim b() As Byte = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}

    ' Use frame rendered callback to move the active LED every frame
    Sub FrameRenderedCB(ByVal sender As BrickletLEDStrip, ByVal length As Integer)
        b(rIndex) = 0
        If rIndex = NUM_LEDS-1 Then
            rIndex = 0
        Else
            rIndex = rIndex + 1
        End If
        b(rIndex) = 255

        ' Set new data for next render cycle
        sender.SetRGBValues(0, NUM_LEDS, r, g, b)
    End Sub

    Sub Main()
        Dim ipcon As New IPConnection() ' Create IP connection
        Dim ls As New BrickletLEDStrip(UID, ipcon) ' Create device object

        ipcon.Connect(HOST, PORT) ' Connect to brickd
        ' Don't use device before ipcon is connected

        ' Set frame duration to 50ms (20 frames per second)
        ls.SetFrameDuration(50)

        ' Register frame rendered callback to subroutine FrameRenderedCB
        AddHandler ls.FrameRenderedCallback, AddressOf FrameRenderedCB

        ' Set initial rgb values to get started
        ls.SetRGBValues(0, NUM_LEDS, r, g, b)

        Console.WriteLine("Press key to exit")
        Console.ReadLine()
        ipcon.Disconnect()
    End Sub
End Module

API

Since Visual Basic .NET does not support multiple return values directly, we use the ByRef keyword to return multiple values from a function.

All functions and procedures listed below are thread-safe.

Basic Functions

Class BrickletLEDStrip(ByVal uid As String, ByVal ipcon As IPConnection)

Creates an object with the unique device ID uid:

Dim ledStrip As New BrickletLEDStrip("YOUR_DEVICE_UID", ipcon)

This object can then be used after the IP Connection is connected (see examples above).

Sub BrickletLEDStrip.SetRGBValues(ByVal index As Integer, ByVal length As Byte, ByVal r() As Byte, ByVal g() As Byte, ByVal b() As Byte)
Parameters:
  • index – Type: Integer, Range: [0 to 216 - 1]
  • length – Type: Byte, Range: [0 to 255]
  • r – Type: Byte Array, Length: 16, Range: [0 to 255]
  • g – Type: Byte Array, Length: 16, Range: [0 to 255]
  • b – Type: Byte Array, Length: 16, Range: [0 to 255]

Sets the RGB values for the LEDs with the given length starting from index.

To make the colors show correctly you need to configure the chip type (SetChipType()) and a 3-channel channel mapping (SetChannelMapping()) according to the connected LEDs.

The maximum length is 16, the index goes from 0 to 319 and the rgb values have 8 bits each.

Example: If you set

  • index to 5,
  • length to 3,
  • r to [255, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
  • g to [0, 255, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0] and
  • b to [0, 0, 255, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]

the LED with index 5 will be red, 6 will be green and 7 will be blue.

Note

Depending on the LED circuitry colors can be permuted.

The colors will be transfered to actual LEDs when the next frame duration ends, see SetFrameDuration().

Generic approach:

  • Set the frame duration to a value that represents the number of frames per second you want to achieve.
  • Set all of the LED colors for one frame.
  • Wait for the FrameRenderedCallback callback.
  • Set all of the LED colors for next frame.
  • Wait for the FrameRenderedCallback callback.
  • and so on.

This approach ensures that you can change the LED colors with a fixed frame rate.

The actual number of controllable LEDs depends on the number of free Bricklet ports. See here for more information. A call of SetRGBValues() with index + length above the bounds is ignored completely.

Sub BrickletLEDStrip.GetRGBValues(ByVal index As Integer, ByVal length As Byte, ByRef r() As Byte, ByRef g() As Byte, ByRef b() As Byte)
Parameters:
  • index – Type: Integer, Range: [0 to 216 - 1]
  • length – Type: Byte, Range: [0 to 255]
Output Parameters:
  • r – Type: Byte Array, Length: 16, Range: [0 to 255]
  • g – Type: Byte Array, Length: 16, Range: [0 to 255]
  • b – Type: Byte Array, Length: 16, Range: [0 to 255]

Returns RGB value with the given length starting from the given index.

The values are the last values that were set by SetRGBValues().

Sub BrickletLEDStrip.SetFrameDuration(ByVal duration As Integer)
Parameters:
  • duration – Type: Integer, Range: [0 to 216 - 1]

Sets the frame duration in ms.

Example: If you want to achieve 20 frames per second, you should set the frame duration to 50ms (50ms * 20 = 1 second).

For an explanation of the general approach see SetRGBValues().

Default value: 100ms (10 frames per second).

Function BrickletLEDStrip.GetFrameDuration() As Integer
Returns:
  • duration – Type: Integer, Range: [0 to 216 - 1]

Returns the frame duration in ms as set by SetFrameDuration().

Function BrickletLEDStrip.GetSupplyVoltage() As Integer
Returns:
  • voltage – Type: Integer, Range: [0 to 216 - 1]

Returns the current supply voltage of the LEDs. The voltage is given in mV.

Sub BrickletLEDStrip.SetClockFrequency(ByVal frequency As Long)
Parameters:
  • frequency – Type: Long, Range: [0 to 232 - 1]

Sets the frequency of the clock in Hz. The range is 10000Hz (10kHz) up to 2000000Hz (2MHz).

The Bricklet will choose the nearest achievable frequency, which may be off by a few Hz. You can get the exact frequency that is used by calling GetClockFrequency().

If you have problems with flickering LEDs, they may be bits flipping. You can fix this by either making the connection between the LEDs and the Bricklet shorter or by reducing the frequency.

With a decreasing frequency your maximum frames per second will decrease too.

The default value is 1.66MHz.

Note

The frequency in firmware version 2.0.0 is fixed at 2MHz.

New in version 2.0.1 (Plugin).

Function BrickletLEDStrip.GetClockFrequency() As Long
Returns:
  • frequency – Type: Long, Range: [0 to 232 - 1]

Returns the currently used clock frequency as set by SetClockFrequency().

New in version 2.0.1 (Plugin).

Sub BrickletLEDStrip.SetChipType(ByVal chip As Integer)
Parameters:
  • chip – Type: Integer, Range: See constants

Sets the type of the LED driver chip. We currently support the chips

  • WS2801,
  • WS2811,
  • WS2812 / SK6812 / NeoPixel RGB,
  • SK6812RGBW / NeoPixel RGBW (Chip Type = WS2812),
  • LPD8806 and
  • APA102 / DotStar.

The default value is WS2801 (2801).

The following constants are available for this function:

For chip:

  • BrickletLEDStrip.CHIP_TYPE_WS2801 = 2801
  • BrickletLEDStrip.CHIP_TYPE_WS2811 = 2811
  • BrickletLEDStrip.CHIP_TYPE_WS2812 = 2812
  • BrickletLEDStrip.CHIP_TYPE_LPD8806 = 8806
  • BrickletLEDStrip.CHIP_TYPE_APA102 = 102

New in version 2.0.2 (Plugin).

Function BrickletLEDStrip.GetChipType() As Integer
Returns:
  • chip – Type: Integer, Range: See constants

Returns the currently used chip type as set by SetChipType().

The following constants are available for this function:

For chip:

  • BrickletLEDStrip.CHIP_TYPE_WS2801 = 2801
  • BrickletLEDStrip.CHIP_TYPE_WS2811 = 2811
  • BrickletLEDStrip.CHIP_TYPE_WS2812 = 2812
  • BrickletLEDStrip.CHIP_TYPE_LPD8806 = 8806
  • BrickletLEDStrip.CHIP_TYPE_APA102 = 102

New in version 2.0.2 (Plugin).

Sub BrickletLEDStrip.SetRGBWValues(ByVal index As Integer, ByVal length As Byte, ByVal r() As Byte, ByVal g() As Byte, ByVal b() As Byte, ByVal w() As Byte)
Parameters:
  • index – Type: Integer, Range: [0 to 216 - 1]
  • length – Type: Byte, Range: [0 to 255]
  • r – Type: Byte Array, Length: 12, Range: [0 to 255]
  • g – Type: Byte Array, Length: 12, Range: [0 to 255]
  • b – Type: Byte Array, Length: 12, Range: [0 to 255]
  • w – Type: Byte Array, Length: 12, Range: [0 to 255]

Sets the RGBW values for the LEDs with the given length starting from index.

To make the colors show correctly you need to configure the chip type (SetChipType()) and a 4-channel channel mapping (SetChannelMapping()) according to the connected LEDs.

The maximum length is 12, the index goes from 0 to 239 and the rgbw values have 8 bits each.

Example: If you set

  • index to 5,
  • length to 4,
  • r to [255, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
  • g to [0, 255, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
  • b to [0, 0, 255, 0, 0, 0, 0, 0, 0, 0, 0, 0] and
  • w to [0, 0, 255, 0, 0, 0, 0, 0, 0, 0, 0, 0]

the LED with index 5 will be red, 6 will be green, 7 will be blue and 8 will be white.

Note

Depending on the LED circuitry colors can be permuted.

The colors will be transfered to actual LEDs when the next frame duration ends, see SetFrameDuration().

Generic approach:

  • Set the frame duration to a value that represents the number of frames per second you want to achieve.
  • Set all of the LED colors for one frame.
  • Wait for the FrameRenderedCallback callback.
  • Set all of the LED colors for next frame.
  • Wait for the FrameRenderedCallback callback.
  • and so on.

This approach ensures that you can change the LED colors with a fixed frame rate.

The actual number of controllable LEDs depends on the number of free Bricklet ports. See here for more information. A call of SetRGBWValues() with index + length above the bounds is ignored completely.

The LPD8806 LED driver chips have 7-bit channels for RGB. Internally the LED Strip Bricklets divides the 8-bit values set using this function by 2 to make them 7-bit. Therefore, you can just use the normal value range (0-255) for LPD8806 LEDs.

The brightness channel of the APA102 LED driver chips has 5-bit. Internally the LED Strip Bricklets divides the 8-bit values set using this function by 8 to make them 5-bit. Therefore, you can just use the normal value range (0-255) for the brightness channel of APA102 LEDs.

New in version 2.0.6 (Plugin).

Sub BrickletLEDStrip.GetRGBWValues(ByVal index As Integer, ByVal length As Byte, ByRef r() As Byte, ByRef g() As Byte, ByRef b() As Byte, ByRef w() As Byte)
Parameters:
  • index – Type: Integer, Range: [0 to 216 - 1]
  • length – Type: Byte, Range: [0 to 255]
Output Parameters:
  • r – Type: Byte Array, Length: 12, Range: [0 to 255]
  • g – Type: Byte Array, Length: 12, Range: [0 to 255]
  • b – Type: Byte Array, Length: 12, Range: [0 to 255]
  • w – Type: Byte Array, Length: 12, Range: [0 to 255]

Returns RGBW values with the given length starting from the given index.

The values are the last values that were set by SetRGBWValues().

New in version 2.0.6 (Plugin).

Sub BrickletLEDStrip.SetChannelMapping(ByVal mapping As Byte)
Parameters:
  • mapping – Type: Byte, Range: See constants

Sets the channel mapping for the connected LEDs.

SetRGBValues() and SetRGBWValues() take the data in RGB(W) order. But the connected LED driver chips might have their 3 or 4 channels in a different order. For example, the WS2801 chips typically use BGR order, the WS2812 chips typically use GRB order and the APA102 chips typically use WBGR order.

The APA102 chips are special. They have three 8-bit channels for RGB and an additional 5-bit channel for the overall brightness of the RGB LED making them 4-channel chips. Internally the brightness channel is the first channel, therefore one of the Wxyz channel mappings should be used. Then the W channel controls the brightness.

If a 3-channel mapping is selected then SetRGBValues() has to be used. Calling SetRGBWValues() with a 3-channel mapping will produce incorrect results. Vice-versa if a 4-channel mapping is selected then SetRGBWValues() has to be used. Calling SetRGBValues() with a 4-channel mapping will produce incorrect results.

The default value is BGR (36).

The following constants are available for this function:

For mapping:

  • BrickletLEDStrip.CHANNEL_MAPPING_RGB = 6
  • BrickletLEDStrip.CHANNEL_MAPPING_RBG = 9
  • BrickletLEDStrip.CHANNEL_MAPPING_BRG = 33
  • BrickletLEDStrip.CHANNEL_MAPPING_BGR = 36
  • BrickletLEDStrip.CHANNEL_MAPPING_GRB = 18
  • BrickletLEDStrip.CHANNEL_MAPPING_GBR = 24
  • BrickletLEDStrip.CHANNEL_MAPPING_RGBW = 27
  • BrickletLEDStrip.CHANNEL_MAPPING_RGWB = 30
  • BrickletLEDStrip.CHANNEL_MAPPING_RBGW = 39
  • BrickletLEDStrip.CHANNEL_MAPPING_RBWG = 45
  • BrickletLEDStrip.CHANNEL_MAPPING_RWGB = 54
  • BrickletLEDStrip.CHANNEL_MAPPING_RWBG = 57
  • BrickletLEDStrip.CHANNEL_MAPPING_GRWB = 78
  • BrickletLEDStrip.CHANNEL_MAPPING_GRBW = 75
  • BrickletLEDStrip.CHANNEL_MAPPING_GBWR = 108
  • BrickletLEDStrip.CHANNEL_MAPPING_GBRW = 99
  • BrickletLEDStrip.CHANNEL_MAPPING_GWBR = 120
  • BrickletLEDStrip.CHANNEL_MAPPING_GWRB = 114
  • BrickletLEDStrip.CHANNEL_MAPPING_BRGW = 135
  • BrickletLEDStrip.CHANNEL_MAPPING_BRWG = 141
  • BrickletLEDStrip.CHANNEL_MAPPING_BGRW = 147
  • BrickletLEDStrip.CHANNEL_MAPPING_BGWR = 156
  • BrickletLEDStrip.CHANNEL_MAPPING_BWRG = 177
  • BrickletLEDStrip.CHANNEL_MAPPING_BWGR = 180
  • BrickletLEDStrip.CHANNEL_MAPPING_WRBG = 201
  • BrickletLEDStrip.CHANNEL_MAPPING_WRGB = 198
  • BrickletLEDStrip.CHANNEL_MAPPING_WGBR = 216
  • BrickletLEDStrip.CHANNEL_MAPPING_WGRB = 210
  • BrickletLEDStrip.CHANNEL_MAPPING_WBGR = 228
  • BrickletLEDStrip.CHANNEL_MAPPING_WBRG = 225

New in version 2.0.6 (Plugin).

Function BrickletLEDStrip.GetChannelMapping() As Byte
Returns:
  • mapping – Type: Byte, Range: See constants

Returns the currently used channel mapping as set by SetChannelMapping().

The following constants are available for this function:

For mapping:

  • BrickletLEDStrip.CHANNEL_MAPPING_RGB = 6
  • BrickletLEDStrip.CHANNEL_MAPPING_RBG = 9
  • BrickletLEDStrip.CHANNEL_MAPPING_BRG = 33
  • BrickletLEDStrip.CHANNEL_MAPPING_BGR = 36
  • BrickletLEDStrip.CHANNEL_MAPPING_GRB = 18
  • BrickletLEDStrip.CHANNEL_MAPPING_GBR = 24
  • BrickletLEDStrip.CHANNEL_MAPPING_RGBW = 27
  • BrickletLEDStrip.CHANNEL_MAPPING_RGWB = 30
  • BrickletLEDStrip.CHANNEL_MAPPING_RBGW = 39
  • BrickletLEDStrip.CHANNEL_MAPPING_RBWG = 45
  • BrickletLEDStrip.CHANNEL_MAPPING_RWGB = 54
  • BrickletLEDStrip.CHANNEL_MAPPING_RWBG = 57
  • BrickletLEDStrip.CHANNEL_MAPPING_GRWB = 78
  • BrickletLEDStrip.CHANNEL_MAPPING_GRBW = 75
  • BrickletLEDStrip.CHANNEL_MAPPING_GBWR = 108
  • BrickletLEDStrip.CHANNEL_MAPPING_GBRW = 99
  • BrickletLEDStrip.CHANNEL_MAPPING_GWBR = 120
  • BrickletLEDStrip.CHANNEL_MAPPING_GWRB = 114
  • BrickletLEDStrip.CHANNEL_MAPPING_BRGW = 135
  • BrickletLEDStrip.CHANNEL_MAPPING_BRWG = 141
  • BrickletLEDStrip.CHANNEL_MAPPING_BGRW = 147
  • BrickletLEDStrip.CHANNEL_MAPPING_BGWR = 156
  • BrickletLEDStrip.CHANNEL_MAPPING_BWRG = 177
  • BrickletLEDStrip.CHANNEL_MAPPING_BWGR = 180
  • BrickletLEDStrip.CHANNEL_MAPPING_WRBG = 201
  • BrickletLEDStrip.CHANNEL_MAPPING_WRGB = 198
  • BrickletLEDStrip.CHANNEL_MAPPING_WGBR = 216
  • BrickletLEDStrip.CHANNEL_MAPPING_WGRB = 210
  • BrickletLEDStrip.CHANNEL_MAPPING_WBGR = 228
  • BrickletLEDStrip.CHANNEL_MAPPING_WBRG = 225

New in version 2.0.6 (Plugin).

Advanced Functions

Function BrickletLEDStrip.GetAPIVersion() As Byte()
Returns:
  • apiVersion – Type: Byte Array, Length: 3, Range: [0 to 255]

Returns the version of the API definition (major, minor, revision) implemented by this API bindings. This is neither the release version of this API bindings nor does it tell you anything about the represented Brick or Bricklet.

Function BrickletLEDStrip.GetResponseExpected(ByVal functionId As Byte) As Boolean
Parameters:
  • functionId – Type: Byte, Range: See constants
Returns:
  • responseExpected – Type: Boolean

Returns the response expected flag for the function specified by the function ID parameter. It is true if the function is expected to send a response, false otherwise.

For getter functions this is enabled by default and cannot be disabled, because those functions will always send a response. For callback configuration functions it is enabled by default too, but can be disabled by SetResponseExpected(). For setter functions it is disabled by default and can be enabled.

Enabling the response expected flag for a setter function allows to detect timeouts and other error conditions calls of this setter as well. The device will then send a response for this purpose. If this flag is disabled for a setter function then no response is send and errors are silently ignored, because they cannot be detected.

The following constants are available for this function:

For functionId:

  • BrickletLEDStrip.FUNCTION_SET_RGB_VALUES = 1
  • BrickletLEDStrip.FUNCTION_SET_FRAME_DURATION = 3
  • BrickletLEDStrip.FUNCTION_SET_CLOCK_FREQUENCY = 7
  • BrickletLEDStrip.FUNCTION_SET_CHIP_TYPE = 9
  • BrickletLEDStrip.FUNCTION_SET_RGBW_VALUES = 11
  • BrickletLEDStrip.FUNCTION_SET_CHANNEL_MAPPING = 13
  • BrickletLEDStrip.FUNCTION_ENABLE_FRAME_RENDERED_CALLBACK = 15
  • BrickletLEDStrip.FUNCTION_DISABLE_FRAME_RENDERED_CALLBACK = 16
Sub BrickletLEDStrip.SetResponseExpected(ByVal functionId As Byte, ByVal responseExpected As Boolean)
Parameters:
  • functionId – Type: Byte, Range: See constants
  • responseExpected – Type: Boolean

Changes the response expected flag of the function specified by the function ID parameter. This flag can only be changed for setter (default value: false) and callback configuration functions (default value: true). For getter functions it is always enabled.

Enabling the response expected flag for a setter function allows to detect timeouts and other error conditions calls of this setter as well. The device will then send a response for this purpose. If this flag is disabled for a setter function then no response is send and errors are silently ignored, because they cannot be detected.

The following constants are available for this function:

For functionId:

  • BrickletLEDStrip.FUNCTION_SET_RGB_VALUES = 1
  • BrickletLEDStrip.FUNCTION_SET_FRAME_DURATION = 3
  • BrickletLEDStrip.FUNCTION_SET_CLOCK_FREQUENCY = 7
  • BrickletLEDStrip.FUNCTION_SET_CHIP_TYPE = 9
  • BrickletLEDStrip.FUNCTION_SET_RGBW_VALUES = 11
  • BrickletLEDStrip.FUNCTION_SET_CHANNEL_MAPPING = 13
  • BrickletLEDStrip.FUNCTION_ENABLE_FRAME_RENDERED_CALLBACK = 15
  • BrickletLEDStrip.FUNCTION_DISABLE_FRAME_RENDERED_CALLBACK = 16
Sub BrickletLEDStrip.SetResponseExpectedAll(ByVal responseExpected As Boolean)
Parameters:
  • responseExpected – Type: Boolean

Changes the response expected flag for all setter and callback configuration functions of this device at once.

Sub BrickletLEDStrip.GetIdentity(ByRef uid As String, ByRef connectedUid As String, ByRef position As Char, ByRef hardwareVersion() As Byte, ByRef firmwareVersion() As Byte, ByRef deviceIdentifier As Integer)
Output Parameters:
  • uid – Type: String, Length: up to 8
  • connectedUid – Type: String, Length: up to 8
  • position – Type: Char
  • hardwareVersion – Type: Byte Array, Length: 3, Range: [0 to 255]
  • firmwareVersion – Type: Byte Array, Length: 3, Range: [0 to 255]
  • deviceIdentifier – Type: Integer, Range: [0 to 216 - 1]

Returns the UID, the UID where the Bricklet is connected to, the position, the hardware and firmware version as well as the device identifier.

The position can be 'a', 'b', 'c' or 'd'.

The device identifier numbers can be found here. There is also a constant for the device identifier of this Bricklet.

Callback Configuration Functions

Sub BrickletLEDStrip.EnableFrameRenderedCallback()

Enables the FrameRenderedCallback callback.

By default the callback is enabled.

New in version 2.0.6 (Plugin).

Sub BrickletLEDStrip.DisableFrameRenderedCallback()

Disables the FrameRenderedCallback callback.

By default the callback is enabled.

New in version 2.0.6 (Plugin).

Function BrickletLEDStrip.IsFrameRenderedCallbackEnabled() As Boolean
Returns:
  • enabled – Type: Boolean

Returns true if the FrameRenderedCallback callback is enabled, false otherwise.

New in version 2.0.6 (Plugin).

Callbacks

Callbacks can be registered to receive time critical or recurring data from the device. The registration is done by assigning a procedure to an callback property of the device object:

Sub MyCallback(ByVal sender As BrickletLEDStrip, ByVal value As Short)
    Console.WriteLine("Value: {0}", value)
End Sub

AddHandler ledStrip.ExampleCallback, AddressOf MyCallback

The available callback property and their type of parameters are described below.

Note

Using callbacks for recurring events is always preferred compared to using getters. It will use less USB bandwidth and the latency will be a lot better, since there is no round trip time.

Event BrickletLEDStrip.FrameRenderedCallback(ByVal sender As BrickletLEDStrip, ByVal length As Integer)
Callback Parameters:
  • sender – Type: BrickletLEDStrip
  • length – Type: Integer, Range: [0 to 216 - 1]

This callback is triggered directly after a new frame is rendered. The parameter is the number of LEDs in that frame.

You should send the data for the next frame directly after this callback was triggered.

For an explanation of the general approach see SetRGBValues().

Constants

Const BrickletLEDStrip.DEVICE_IDENTIFIER

This constant is used to identify a LED Strip Bricklet.

The GetIdentity() function and the IPConnection.EnumerateCallback callback of the IP Connection have a deviceIdentifier parameter to specify the Brick's or Bricklet's type.

Const BrickletLEDStrip.DEVICE_DISPLAY_NAME

This constant represents the human readable name of a LED Strip Bricklet.