Visual Basic .NET - Barometer 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 Barometer Bricklet

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

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

        ' Get current air pressure
        Dim airPressure As Integer = b.GetAirPressure()
        Console.WriteLine("Air Pressure: " + (airPressure/1000.0).ToString() + " hPa")

        ' Get current altitude
        Dim altitude As Integer = b.GetAltitude()
        Console.WriteLine("Altitude: " + (altitude/100.0).ToString() + " m")

        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 Barometer Bricklet

    ' Callback subroutine for air pressure callback
    Sub AirPressureCB(ByVal sender As BrickletBarometer, ByVal airPressure As Integer)
        Console.WriteLine("Air Pressure: " + (airPressure/1000.0).ToString() + " hPa")
    End Sub

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

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

        ' Register air pressure callback to subroutine AirPressureCB
        AddHandler b.AirPressureCallback, AddressOf AirPressureCB

        ' Set period for air pressure callback to 1s (1000ms)
        ' Note: The air pressure callback is only called every second
        '       if the air pressure has changed since the last call!
        b.SetAirPressureCallbackPeriod(1000)

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

Threshold¶

Download (ExampleThreshold.vb)

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Imports System
Imports Tinkerforge

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

    ' Callback subroutine for air pressure reached callback
    Sub AirPressureReachedCB(ByVal sender As BrickletBarometer, _
                             ByVal airPressure As Integer)
        Console.WriteLine("Air Pressure: " + (airPressure/1000.0).ToString() + " hPa")
        Console.WriteLine("Enjoy the potentially good weather!")
    End Sub

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

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

        ' Get threshold callbacks with a debounce time of 10 seconds (10000ms)
        b.SetDebouncePeriod(10000)

        ' Register air pressure reached callback to subroutine AirPressureReachedCB
        AddHandler b.AirPressureReachedCallback, AddressOf AirPressureReachedCB

        ' Configure threshold for air pressure "greater than 1025 hPa"
        b.SetAirPressureCallbackThreshold(">"C, 1025*1000, 0)

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

Basic Functions¶

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

Creates an object with the unique device ID uid:

Dim barometer As New BrickletBarometer("YOUR_DEVICE_UID", ipcon)

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

Function BrickletBarometer.GetAirPressure() As Integer¶

Returns:	airPressure – Type: Integer, Unit: 1/1000 hPa, Range: [10000 to 1200000]

Returns the air pressure of the air pressure sensor.

If you want to get the air pressure periodically, it is recommended to use the AirPressureCallback callback and set the period with SetAirPressureCallbackPeriod().

Function BrickletBarometer.GetAltitude() As Integer¶

Returns:	altitude – Type: Integer, Unit: 1 cm, Range: [-231 to 231 - 1]

Returns the relative altitude of the air pressure sensor. The value is calculated based on the difference between the current air pressure and the reference air pressure that can be set with SetReferenceAirPressure().

If you want to get the altitude periodically, it is recommended to use the AltitudeCallback callback and set the period with SetAltitudeCallbackPeriod().

Sub BrickletBarometer.SetReferenceAirPressure(ByVal airPressure As Integer)¶

Parameters:	airPressure – Type: Integer, Unit: 1/1000 hPa, Range: [0, 10000 to 1200000], Default: 1013250

Sets the reference air pressure for the altitude calculation. Setting the reference to the current air pressure results in a calculated altitude of 0cm. Passing 0 is a shortcut for passing the current air pressure as reference.

Well known reference values are the Q codes QNH and QFE used in aviation.

Function BrickletBarometer.GetReferenceAirPressure() As Integer¶

Returns:	airPressure – Type: Integer, Unit: 1/1000 hPa, Range: [10000 to 1200000], Default: 1013250

Returns the reference air pressure as set by SetReferenceAirPressure().

Advanced Functions¶

Function BrickletBarometer.GetChipTemperature() As Short¶

Returns:	temperature – Type: Short, Unit: 1/100 °C, Range: [-4000 to 8500]

Returns the temperature of the air pressure sensor.

This temperature is used internally for temperature compensation of the air pressure measurement. It is not as accurate as the temperature measured by the Temperature Bricklet or the Temperature IR Bricklet.

Sub BrickletBarometer.SetAveraging(ByVal movingAveragePressure As Byte, ByVal averagePressure As Byte, ByVal averageTemperature As Byte)¶

Parameters:	movingAveragePressure – Type: Byte, Range: [0 to 25], Default: 25 averagePressure – Type: Byte, Range: [0 to 10], Default: 10 averageTemperature – Type: Byte, Range: [0 to 255], Default: 10

Sets the different averaging parameters. It is possible to set the length of a normal averaging for the temperature and pressure, as well as an additional length of a moving average for the pressure. The moving average is calculated from the normal averages. There is no moving average for the temperature.

Setting the all three parameters to 0 will turn the averaging completely off. If the averaging is off, there is lots of noise on the data, but the data is without delay. Thus we recommend to turn the averaging off if the Barometer Bricklet data is to be used for sensor fusion with other sensors.

New in version 2.0.1 (Plugin).

Sub BrickletBarometer.GetAveraging(ByRef movingAveragePressure As Byte, ByRef averagePressure As Byte, ByRef averageTemperature As Byte)¶

Output Parameters:	movingAveragePressure – Type: Byte, Range: [0 to 25], Default: 25 averagePressure – Type: Byte, Range: [0 to 10], Default: 10 averageTemperature – Type: Byte, Range: [0 to 255], Default: 10

Returns the averaging configuration as set by SetAveraging().

New in version 2.0.1 (Plugin).

Sub BrickletBarometer.SetI2CMode(ByVal mode As Byte)¶

Parameters:	mode – Type: Byte, Range: See constants, Default: 0

Sets the I2C mode. Possible modes are:

• 0: Fast (400kHz)
• 1: Slow (100kHz)

If you have problems with obvious outliers in the Barometer Bricklet measurements, they may be caused by EMI issues. In this case it may be helpful to lower the I2C speed.

It is however not recommended to lower the I2C speed in applications where a high throughput needs to be achieved.

The following constants are available for this function:

For mode:

• BrickletBarometer.I2C_MODE_FAST = 0
• BrickletBarometer.I2C_MODE_SLOW = 1

New in version 2.0.3 (Plugin).

Function BrickletBarometer.GetI2CMode() As Byte¶

Returns:	mode – Type: Byte, Range: See constants, Default: 0

Returns the I2C mode as set by SetI2CMode().

The following constants are available for this function:

For mode:

• BrickletBarometer.I2C_MODE_FAST = 0
• BrickletBarometer.I2C_MODE_SLOW = 1

New in version 2.0.3 (Plugin).

Sub BrickletBarometer.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 BrickletBarometer.SetAirPressureCallbackPeriod(ByVal period As Long)¶

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

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

The AirPressureCallback callback is only triggered if the air pressure has changed since the last triggering.

Function BrickletBarometer.GetAirPressureCallbackPeriod() As Long¶

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

Returns the period as set by SetAirPressureCallbackPeriod().

Sub BrickletBarometer.SetAltitudeCallbackPeriod(ByVal period As Long)¶

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

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

The AltitudeCallback callback is only triggered if the altitude has changed since the last triggering.

Function BrickletBarometer.GetAltitudeCallbackPeriod() As Long¶

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

Returns the period as set by SetAltitudeCallbackPeriod().

Sub BrickletBarometer.SetAirPressureCallbackThreshold(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: 1/1000 hPa, Range: [-231 to 231 - 1], Default: 0 max – Type: Integer, Unit: 1/1000 hPa, Range: [-231 to 231 - 1], Default: 0

Sets the thresholds for the AirPressureReachedCallback callback.

The following options are possible:

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

The following constants are available for this function:

For option:

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

Sub BrickletBarometer.GetAirPressureCallbackThreshold(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: 1/1000 hPa, Range: [-231 to 231 - 1], Default: 0 max – Type: Integer, Unit: 1/1000 hPa, Range: [-231 to 231 - 1], Default: 0

Returns the threshold as set by SetAirPressureCallbackThreshold().

The following constants are available for this function:

For option:

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

Sub BrickletBarometer.SetAltitudeCallbackThreshold(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 cm, Range: [-231 to 231 - 1], Default: 0 max – Type: Integer, Unit: 1 cm, Range: [-231 to 231 - 1], Default: 0

Sets the thresholds for the AltitudeReachedCallback callback.

The following options are possible:

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

The following constants are available for this function:

For option:

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

Sub BrickletBarometer.GetAltitudeCallbackThreshold(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 cm, Range: [-231 to 231 - 1], Default: 0 max – Type: Integer, Unit: 1 cm, Range: [-231 to 231 - 1], Default: 0

Returns the threshold as set by SetAltitudeCallbackThreshold().

The following constants are available for this function:

For option:

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

Sub BrickletBarometer.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

• AirPressureReachedCallback,
• AltitudeReachedCallback

are triggered, if the thresholds

• SetAirPressureCallbackThreshold(),
• SetAltitudeCallbackThreshold()

keep being reached.

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

AddHandler barometer.ExampleCallback, AddressOf MyCallback

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

Event BrickletBarometer.AirPressureCallback(ByVal sender As BrickletBarometer, ByVal airPressure As Integer)¶

Callback Parameters:	sender – Type: BrickletBarometer airPressure – Type: Integer, Unit: 1/1000 hPa, Range: [10000 to 1200000]

This callback is triggered periodically with the period that is set by SetAirPressureCallbackPeriod(). The parameter is the air pressure of the air pressure sensor.

The AirPressureCallback callback is only triggered if the air pressure has changed since the last triggering.

Event BrickletBarometer.AltitudeCallback(ByVal sender As BrickletBarometer, ByVal altitude As Integer)¶

Callback Parameters:	sender – Type: BrickletBarometer altitude – Type: Integer, Unit: 1 cm, Range: [-231 to 231 - 1]

This callback is triggered periodically with the period that is set by SetAltitudeCallbackPeriod(). The parameter is the altitude of the air pressure sensor.

The AltitudeCallback callback is only triggered if the altitude has changed since the last triggering.

Event BrickletBarometer.AirPressureReachedCallback(ByVal sender As BrickletBarometer, ByVal airPressure As Integer)¶

Callback Parameters:	sender – Type: BrickletBarometer airPressure – Type: Integer, Unit: 1/1000 hPa, Range: [10000 to 1200000]

This callback is triggered when the threshold as set by SetAirPressureCallbackThreshold() is reached. The parameter is the air pressure of the air pressure sensor.

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

Event BrickletBarometer.AltitudeReachedCallback(ByVal sender As BrickletBarometer, ByVal altitude As Integer)¶

Callback Parameters:	sender – Type: BrickletBarometer altitude – Type: Integer, Unit: 1 cm, Range: [-231 to 231 - 1]

This callback is triggered when the threshold as set by SetAltitudeCallbackThreshold() is reached. The parameter is the altitude of the air pressure sensor.

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 BrickletBarometer.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 BrickletBarometer.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:

• BrickletBarometer.FUNCTION_SET_AIR_PRESSURE_CALLBACK_PERIOD = 3
• BrickletBarometer.FUNCTION_SET_ALTITUDE_CALLBACK_PERIOD = 5
• BrickletBarometer.FUNCTION_SET_AIR_PRESSURE_CALLBACK_THRESHOLD = 7
• BrickletBarometer.FUNCTION_SET_ALTITUDE_CALLBACK_THRESHOLD = 9
• BrickletBarometer.FUNCTION_SET_DEBOUNCE_PERIOD = 11
• BrickletBarometer.FUNCTION_SET_REFERENCE_AIR_PRESSURE = 13
• BrickletBarometer.FUNCTION_SET_AVERAGING = 20
• BrickletBarometer.FUNCTION_SET_I2C_MODE = 22

Sub BrickletBarometer.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:

• BrickletBarometer.FUNCTION_SET_AIR_PRESSURE_CALLBACK_PERIOD = 3
• BrickletBarometer.FUNCTION_SET_ALTITUDE_CALLBACK_PERIOD = 5
• BrickletBarometer.FUNCTION_SET_AIR_PRESSURE_CALLBACK_THRESHOLD = 7
• BrickletBarometer.FUNCTION_SET_ALTITUDE_CALLBACK_THRESHOLD = 9
• BrickletBarometer.FUNCTION_SET_DEBOUNCE_PERIOD = 11
• BrickletBarometer.FUNCTION_SET_REFERENCE_AIR_PRESSURE = 13
• BrickletBarometer.FUNCTION_SET_AVERAGING = 20
• BrickletBarometer.FUNCTION_SET_I2C_MODE = 22

Sub BrickletBarometer.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 BrickletBarometer.DEVICE_IDENTIFIER¶

This constant is used to identify a Barometer 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 BrickletBarometer.DEVICE_DISPLAY_NAME¶

This constant represents the human readable name of a Barometer Bricklet.