Visual Basic .NET - Linear Poti Bricklet¶

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 Linear Poti Bricklet

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

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

        ' Get current position
        Dim position As Integer = lp.GetPosition()
        Console.WriteLine("Position: " + position.ToString() + " %") ' Range: 0 to 100

        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 Linear Poti Bricklet

    ' Callback subroutine for position callback
    Sub PositionCB(ByVal sender As BrickletLinearPoti, ByVal position As Integer)
        Console.WriteLine("Position: " + position.ToString() + " %") ' Range: 0 to 100
    End Sub

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

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

        ' Register position callback to subroutine PositionCB
        AddHandler lp.PositionCallback, AddressOf PositionCB

        ' Set period for position callback to 0.05s (50ms)
        ' Note: The position callback is only called every 0.05 seconds
        '       if the position has changed since the last call!
        lp.SetPositionCallbackPeriod(50)

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

Basic Functions¶

Class BrickletLinearPoti(ByVal uid As String, ByVal ipcon As IPConnection)¶

Creates an object with the unique device ID uid:

Dim linearPoti As New BrickletLinearPoti("YOUR_DEVICE_UID", ipcon)

This object can then be used after the IP Connection is connected.

Function BrickletLinearPoti.GetPosition() As Integer¶

Returns:	position – Type: Integer, Unit: 1 %, Range: [0 to 100]

Returns the position of the linear potentiometer. The value is between 0% (slider down) and 100% (slider up).

If you want to get the position periodically, it is recommended to use the PositionCallback callback and set the period with SetPositionCallbackPeriod().

Advanced Functions¶

Function BrickletLinearPoti.GetAnalogValue() As Integer¶

Returns:	value – Type: Integer, Range: [0 to 212 - 1]

Returns the value as read by a 12-bit analog-to-digital converter.

Note

The value returned by GetPosition() is averaged over several samples to yield less noise, while GetAnalogValue() gives back raw unfiltered analog values. The only reason to use GetAnalogValue() is, if you need the full resolution of the analog-to-digital converter.

If you want the analog value periodically, it is recommended to use the AnalogValueCallback callback and set the period with SetAnalogValueCallbackPeriod().

Sub BrickletLinearPoti.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, Range: ["a"C to "h"C, "z"C] hardwareVersion – Type: Byte Array, Length: 3 0: major – Type: Byte, Range: [0 to 255] 1: minor – Type: Byte, Range: [0 to 255] 2: revision – Type: Byte, Range: [0 to 255] firmwareVersion – Type: Byte Array, Length: 3 0: major – Type: Byte, Range: [0 to 255] 1: minor – Type: Byte, Range: [0 to 255] 2: revision – Type: Byte, 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', 'd', 'e', 'f', 'g' or 'h' (Bricklet Port). A Bricklet connected to an Isolator Bricklet is always at position 'z'.

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

Callback Configuration Functions¶

Sub BrickletLinearPoti.SetPositionCallbackPeriod(ByVal period As Long)¶

Parameters:	period – Type: Long, Unit: 1 ms, Range: [0 to 232 - 1], Default: 0

Sets the period with which the PositionCallback callback is triggered periodically. A value of 0 turns the callback off.

The PositionCallback callback is only triggered if the position has changed since the last triggering.

Function BrickletLinearPoti.GetPositionCallbackPeriod() As Long¶

Returns:	period – Type: Long, Unit: 1 ms, Range: [0 to 232 - 1], Default: 0

Returns the period as set by SetPositionCallbackPeriod().

Sub BrickletLinearPoti.SetAnalogValueCallbackPeriod(ByVal period As Long)¶

Parameters:	period – Type: Long, Unit: 1 ms, Range: [0 to 232 - 1], Default: 0

Sets the period with which the AnalogValueCallback callback is triggered periodically. A value of 0 turns the callback off.

The AnalogValueCallback callback is only triggered if the analog value has changed since the last triggering.

Function BrickletLinearPoti.GetAnalogValueCallbackPeriod() As Long¶

Returns:	period – Type: Long, Unit: 1 ms, Range: [0 to 232 - 1], Default: 0

Returns the period as set by SetAnalogValueCallbackPeriod().

Sub BrickletLinearPoti.SetPositionCallbackThreshold(ByVal option As Char, ByVal min As Integer, ByVal max As Integer)¶

Parameters:	option – Type: Char, Range: See constants, Default: "x"C min – Type: Integer, Unit: 1 %, Range: [0 to 216 - 1], Default: 0 max – Type: Integer, Unit: 1 %, Range: [0 to 216 - 1], Default: 0

Sets the thresholds for the PositionReachedCallback callback.

The following options are possible:

Option	Description
'x'	Callback is turned off
'o'	Callback is triggered when the position is outside the min and max values
'i'	Callback is triggered when the position is inside the min and max values
'<'	Callback is triggered when the position is smaller than the min value (max is ignored)
'>'	Callback is triggered when the position is greater than the min value (max is ignored)

The following constants are available for this function:

For option:

• BrickletLinearPoti.THRESHOLD_OPTION_OFF = "x"C
• BrickletLinearPoti.THRESHOLD_OPTION_OUTSIDE = "o"C
• BrickletLinearPoti.THRESHOLD_OPTION_INSIDE = "i"C
• BrickletLinearPoti.THRESHOLD_OPTION_SMALLER = "<"C
• BrickletLinearPoti.THRESHOLD_OPTION_GREATER = ">"C

Sub BrickletLinearPoti.GetPositionCallbackThreshold(ByRef option As Char, ByRef min As Integer, ByRef max As Integer)¶

Output Parameters:	option – Type: Char, Range: See constants, Default: "x"C min – Type: Integer, Unit: 1 %, Range: [0 to 216 - 1], Default: 0 max – Type: Integer, Unit: 1 %, Range: [0 to 216 - 1], Default: 0

Returns the threshold as set by SetPositionCallbackThreshold().

The following constants are available for this function:

For option:

• BrickletLinearPoti.THRESHOLD_OPTION_OFF = "x"C
• BrickletLinearPoti.THRESHOLD_OPTION_OUTSIDE = "o"C
• BrickletLinearPoti.THRESHOLD_OPTION_INSIDE = "i"C
• BrickletLinearPoti.THRESHOLD_OPTION_SMALLER = "<"C
• BrickletLinearPoti.THRESHOLD_OPTION_GREATER = ">"C

Sub BrickletLinearPoti.SetAnalogValueCallbackThreshold(ByVal option As Char, ByVal min As Integer, ByVal max As Integer)¶

Parameters:	option – Type: Char, Range: See constants, Default: "x"C min – Type: Integer, Range: [0 to 216 - 1], Default: 0 max – Type: Integer, Range: [0 to 216 - 1], Default: 0

Sets the thresholds for the AnalogValueReachedCallback callback.

The following options are possible:

Option	Description
'x'	Callback is turned off
'o'	Callback is triggered when the analog value is outside the min and max values
'i'	Callback is triggered when the analog value is inside the min and max values
'<'	Callback is triggered when the analog value is smaller than the min value (max is ignored)
'>'	Callback is triggered when the analog value is greater than the min value (max is ignored)

The following constants are available for this function:

For option:

• BrickletLinearPoti.THRESHOLD_OPTION_OFF = "x"C
• BrickletLinearPoti.THRESHOLD_OPTION_OUTSIDE = "o"C
• BrickletLinearPoti.THRESHOLD_OPTION_INSIDE = "i"C
• BrickletLinearPoti.THRESHOLD_OPTION_SMALLER = "<"C
• BrickletLinearPoti.THRESHOLD_OPTION_GREATER = ">"C

Sub BrickletLinearPoti.GetAnalogValueCallbackThreshold(ByRef option As Char, ByRef min As Integer, ByRef max As Integer)¶

Output Parameters:	option – Type: Char, Range: See constants, Default: "x"C min – Type: Integer, Range: [0 to 216 - 1], Default: 0 max – Type: Integer, Range: [0 to 216 - 1], Default: 0

Returns the threshold as set by SetAnalogValueCallbackThreshold().

The following constants are available for this function:

For option:

• BrickletLinearPoti.THRESHOLD_OPTION_OFF = "x"C
• BrickletLinearPoti.THRESHOLD_OPTION_OUTSIDE = "o"C
• BrickletLinearPoti.THRESHOLD_OPTION_INSIDE = "i"C
• BrickletLinearPoti.THRESHOLD_OPTION_SMALLER = "<"C
• BrickletLinearPoti.THRESHOLD_OPTION_GREATER = ">"C

Sub BrickletLinearPoti.SetDebouncePeriod(ByVal debounce As Long)¶

Parameters:	debounce – Type: Long, Unit: 1 ms, Range: [0 to 232 - 1], Default: 100

Sets the period with which the threshold callbacks

• PositionReachedCallback,
• AnalogValueReachedCallback

are triggered, if the thresholds

• SetPositionCallbackThreshold(),
• SetAnalogValueCallbackThreshold()

keep being reached.

Function BrickletLinearPoti.GetDebouncePeriod() As Long¶

Returns:	debounce – Type: Long, Unit: 1 ms, Range: [0 to 232 - 1], Default: 100

Returns the debounce period as set by SetDebouncePeriod().

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

AddHandler linearPoti.ExampleCallback, AddressOf MyCallback

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

Event BrickletLinearPoti.PositionCallback(ByVal sender As BrickletLinearPoti, ByVal position As Integer)¶

Callback Parameters:	sender – Type: BrickletLinearPoti position – Type: Integer, Unit: 1 %, Range: [0 to 100]

This callback is triggered periodically with the period that is set by SetPositionCallbackPeriod(). The parameter is the position of the linear potentiometer.

The PositionCallback callback is only triggered if the position has changed since the last triggering.

Event BrickletLinearPoti.AnalogValueCallback(ByVal sender As BrickletLinearPoti, ByVal value As Integer)¶

Callback Parameters:	sender – Type: BrickletLinearPoti value – Type: Integer, Range: [0 to 212 - 1]

This callback is triggered periodically with the period that is set by SetAnalogValueCallbackPeriod(). The parameter is the analog value of the Linear Potentiometer.

The AnalogValueCallback callback is only triggered if the position has changed since the last triggering.

Event BrickletLinearPoti.PositionReachedCallback(ByVal sender As BrickletLinearPoti, ByVal position As Integer)¶

Callback Parameters:	sender – Type: BrickletLinearPoti position – Type: Integer, Unit: 1 %, Range: [0 to 100]

This callback is triggered when the threshold as set by SetPositionCallbackThreshold() is reached. The parameter is the position of the linear potentiometer.

If the threshold keeps being reached, the callback is triggered periodically with the period as set by SetDebouncePeriod().

Event BrickletLinearPoti.AnalogValueReachedCallback(ByVal sender As BrickletLinearPoti, ByVal value As Integer)¶

Callback Parameters:	sender – Type: BrickletLinearPoti value – Type: Integer, Range: [0 to 212 - 1]

This callback is triggered when the threshold as set by SetAnalogValueCallbackThreshold() is reached. The parameter is the analog value of the linear potentiometer.

If the threshold keeps being reached, the callback is triggered periodically with the period as set by SetDebouncePeriod().

Virtual Functions¶

Virtual functions don't communicate with the device itself, but operate only on the API bindings device object. They can be called without the corresponding IP Connection object being connected.

Function BrickletLinearPoti.GetAPIVersion() As Byte()¶

Output Parameters:	apiVersion – Type: Byte Array, Length: 3 0: major – Type: Byte, Range: [0 to 255] 1: minor – Type: Byte, Range: [0 to 255] 2: revision – Type: Byte, Range: [0 to 255]

Returns the version of the API definition 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 BrickletLinearPoti.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 sent and errors are silently ignored, because they cannot be detected.

The following constants are available for this function:

For functionId:

• BrickletLinearPoti.FUNCTION_SET_POSITION_CALLBACK_PERIOD = 3
• BrickletLinearPoti.FUNCTION_SET_ANALOG_VALUE_CALLBACK_PERIOD = 5
• BrickletLinearPoti.FUNCTION_SET_POSITION_CALLBACK_THRESHOLD = 7
• BrickletLinearPoti.FUNCTION_SET_ANALOG_VALUE_CALLBACK_THRESHOLD = 9
• BrickletLinearPoti.FUNCTION_SET_DEBOUNCE_PERIOD = 11

Sub BrickletLinearPoti.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 sent and errors are silently ignored, because they cannot be detected.

The following constants are available for this function:

For functionId:

• BrickletLinearPoti.FUNCTION_SET_POSITION_CALLBACK_PERIOD = 3
• BrickletLinearPoti.FUNCTION_SET_ANALOG_VALUE_CALLBACK_PERIOD = 5
• BrickletLinearPoti.FUNCTION_SET_POSITION_CALLBACK_THRESHOLD = 7
• BrickletLinearPoti.FUNCTION_SET_ANALOG_VALUE_CALLBACK_THRESHOLD = 9
• BrickletLinearPoti.FUNCTION_SET_DEBOUNCE_PERIOD = 11

Sub BrickletLinearPoti.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.

Constants¶

Const BrickletLinearPoti.DEVICE_IDENTIFIER¶

This constant is used to identify a Linear Poti 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 BrickletLinearPoti.DEVICE_DISPLAY_NAME¶

This constant represents the human readable name of a Linear Poti Bricklet.