Visual Basic .NET - Temperature IR Bricklet 2.0

This is the description of the Visual Basic .NET API bindings for the Temperature IR Bricklet 2.0. General information and technical specifications for the Temperature IR Bricklet 2.0 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)

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
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 Temperature IR Bricklet 2.0

    Sub Main()
        Dim ipcon As New IPConnection() ' Create IP connection
        Dim tir As New BrickletTemperatureIRV2(UID, ipcon) ' Create device object

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

        ' Get current ambient temperature
        Dim ambientTemperature As Short = tir.GetAmbientTemperature()
        Console.WriteLine("Ambient Temperature: " + (ambientTemperature/10.0).ToString() + " °C")

        ' Get current object temperature
        Dim objectTemperature As Short = tir.GetObjectTemperature()
        Console.WriteLine("Object Temperature: " + (objectTemperature/10.0).ToString() + " °C")

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

Callback

Download (ExampleCallback.vb)

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
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 Temperature IR Bricklet 2.0

    ' Callback subroutine for object temperature callback
    Sub ObjectTemperatureCB(ByVal sender As BrickletTemperatureIRV2, _
                            ByVal temperature As Short)
        Console.WriteLine("Object Temperature: " + (temperature/10.0).ToString() + " °C")
    End Sub

    Sub Main()
        Dim ipcon As New IPConnection() ' Create IP connection
        Dim tir As New BrickletTemperatureIRV2(UID, ipcon) ' Create device object

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

        ' Register object temperature callback to subroutine ObjectTemperatureCB
        AddHandler tir.ObjectTemperatureCallback, AddressOf ObjectTemperatureCB

        ' Set period for object temperature callback to 1s (1000ms) without a threshold
        tir.SetObjectTemperatureCallbackConfiguration(1000, False, "x"C, 0, 0)

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

Water Boiling

Download (ExampleWaterBoiling.vb)

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
Imports System
Imports Tinkerforge

Module ExampleWaterBoiling
    Const HOST As String = "localhost"
    Const PORT As Integer = 4223
    Const UID As String = "XYZ" ' Change XYZ to the UID of your Temperature IR Bricklet 2.0

    ' Callback subroutine for object temperature reached callback
    Sub ObjectTemperatureCB(ByVal sender As BrickletTemperatureIRV2, _
                            ByVal temperature As Short)
        Console.WriteLine("Object Temperature: " + (temperature/10.0).ToString() + " °C")
        Console.WriteLine("The water is boiling!")
    End Sub

    Sub Main()
        Dim ipcon As New IPConnection() ' Create IP connection
        Dim tir As New BrickletTemperatureIRV2(UID, ipcon) ' Create device object

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

        ' Set emissivity to 0.98 (emissivity of water, 65535 * 0.98 = 64224.299)
        tir.SetEmissivity(64224)

        ' Register object temperature reached callback to subroutine ObjectTemperatureCB
        AddHandler tir.ObjectTemperatureCallback, AddressOf ObjectTemperatureCB

        ' Configure threshold for object temperature "greater than 100 °C"
        ' with a debounce period of 10s (10000ms)
        tir.SetObjectTemperatureCallbackConfiguration(10000, False, ">"C, 100*10, 0)

        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 BrickletTemperatureIRV2(ByVal uid As String, ByVal ipcon As IPConnection)

Creates an object with the unique device ID uid:

Dim temperatureIRV2 As New BrickletTemperatureIRV2("YOUR_DEVICE_UID", ipcon)

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

Function BrickletTemperatureIRV2.GetAmbientTemperature() As Short

Returns the ambient temperature of the sensor. The value has a range of -400 to 1250 and is given in °C/10, e.g. a value of 423 means that an ambient temperature of 42.3 °C is measured.

If you want to get the ambient temperature periodically, it is recommended to use the AmbientTemperatureCallback callback and set the period with SetAmbientTemperatureCallbackConfiguration().

If you want to get the value periodically, it is recommended to use the AmbientTemperatureCallback callback. You can set the callback configuration with SetAmbientTemperatureCallbackConfiguration().

Function BrickletTemperatureIRV2.GetObjectTemperature() As Short

Returns the object temperature of the sensor, i.e. the temperature of the surface of the object the sensor is aimed at. The value has a range of -700 to 3800 and is given in °C/10, e.g. a value of 3001 means that a temperature of 300.1 °C is measured on the surface of the object.

The temperature of different materials is dependent on their emissivity. The emissivity of the material can be set with SetEmissivity().

If you want to get the object temperature periodically, it is recommended to use the ObjectTemperatureCallback callback and set the period with SetObjectTemperatureCallbackConfiguration().

If you want to get the value periodically, it is recommended to use the ObjectTemperatureCallback callback. You can set the callback configuration with SetObjectTemperatureCallbackConfiguration().

Advanced Functions

Sub BrickletTemperatureIRV2.SetEmissivity(ByVal emissivity As Integer)

Sets the emissivity that is used to calculate the surface temperature as returned by GetObjectTemperature().

The emissivity is usually given as a value between 0.0 and 1.0. A list of emissivities of different materials can be found here.

The parameter of SetEmissivity() has to be given with a factor of 65535 (16-bit). For example: An emissivity of 0.1 can be set with the value 6553, an emissivity of 0.5 with the value 32767 and so on.

Note

If you need a precise measurement for the object temperature, it is absolutely crucial that you also provide a precise emissivity.

The default emissivity is 1.0 (value of 65535) and the minimum emissivity the sensor can handle is 0.1 (value of 6553).

Function BrickletTemperatureIRV2.GetEmissivity() As Integer

Returns the emissivity as set by SetEmissivity().

Function BrickletTemperatureIRV2.GetAPIVersion() As Byte()

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 BrickletTemperatureIRV2.GetResponseExpected(ByVal functionId As Byte) As 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.

See SetResponseExpected() for the list of function ID constants available for this function.

Sub BrickletTemperatureIRV2.SetResponseExpected(ByVal functionId As Byte, ByVal responseExpected As 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 function ID constants are available for this function:

  • BrickletTemperatureIRV2.FUNCTION_SET_AMBIENT_TEMPERATURE_CALLBACK_CONFIGURATION = 2
  • BrickletTemperatureIRV2.FUNCTION_SET_OBJECT_TEMPERATURE_CALLBACK_CONFIGURATION = 6
  • BrickletTemperatureIRV2.FUNCTION_SET_EMISSIVITY = 9
  • BrickletTemperatureIRV2.FUNCTION_SET_WRITE_FIRMWARE_POINTER = 237
  • BrickletTemperatureIRV2.FUNCTION_SET_STATUS_LED_CONFIG = 239
  • BrickletTemperatureIRV2.FUNCTION_RESET = 243
  • BrickletTemperatureIRV2.FUNCTION_WRITE_UID = 248
Sub BrickletTemperatureIRV2.SetResponseExpectedAll(ByVal responseExpected As Boolean)

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

Sub BrickletTemperatureIRV2.GetSPITFPErrorCount(ByRef errorCountAckChecksum As Long, ByRef errorCountMessageChecksum As Long, ByRef errorCountFrame As Long, ByRef errorCountOverflow As Long)

Returns the error count for the communication between Brick and Bricklet.

The errors are divided into

  • ACK checksum errors,
  • message checksum errors,
  • framing errors and
  • overflow errors.

The errors counts are for errors that occur on the Bricklet side. All Bricks have a similar function that returns the errors on the Brick side.

Function BrickletTemperatureIRV2.SetBootloaderMode(ByVal mode As Byte) As Byte

Sets the bootloader mode and returns the status after the requested mode change was instigated.

You can change from bootloader mode to firmware mode and vice versa. A change from bootloader mode to firmware mode will only take place if the entry function, device identifier and CRC are present and correct.

This function is used by Brick Viewer during flashing. It should not be necessary to call it in a normal user program.

The following constants are available for this function:

  • BrickletTemperatureIRV2.BOOTLOADER_MODE_BOOTLOADER = 0
  • BrickletTemperatureIRV2.BOOTLOADER_MODE_FIRMWARE = 1
  • BrickletTemperatureIRV2.BOOTLOADER_MODE_BOOTLOADER_WAIT_FOR_REBOOT = 2
  • BrickletTemperatureIRV2.BOOTLOADER_MODE_FIRMWARE_WAIT_FOR_REBOOT = 3
  • BrickletTemperatureIRV2.BOOTLOADER_MODE_FIRMWARE_WAIT_FOR_ERASE_AND_REBOOT = 4
  • BrickletTemperatureIRV2.BOOTLOADER_STATUS_OK = 0
  • BrickletTemperatureIRV2.BOOTLOADER_STATUS_INVALID_MODE = 1
  • BrickletTemperatureIRV2.BOOTLOADER_STATUS_NO_CHANGE = 2
  • BrickletTemperatureIRV2.BOOTLOADER_STATUS_ENTRY_FUNCTION_NOT_PRESENT = 3
  • BrickletTemperatureIRV2.BOOTLOADER_STATUS_DEVICE_IDENTIFIER_INCORRECT = 4
  • BrickletTemperatureIRV2.BOOTLOADER_STATUS_CRC_MISMATCH = 5
Function BrickletTemperatureIRV2.GetBootloaderMode() As Byte

Returns the current bootloader mode, see SetBootloaderMode().

The following constants are available for this function:

  • BrickletTemperatureIRV2.BOOTLOADER_MODE_BOOTLOADER = 0
  • BrickletTemperatureIRV2.BOOTLOADER_MODE_FIRMWARE = 1
  • BrickletTemperatureIRV2.BOOTLOADER_MODE_BOOTLOADER_WAIT_FOR_REBOOT = 2
  • BrickletTemperatureIRV2.BOOTLOADER_MODE_FIRMWARE_WAIT_FOR_REBOOT = 3
  • BrickletTemperatureIRV2.BOOTLOADER_MODE_FIRMWARE_WAIT_FOR_ERASE_AND_REBOOT = 4
Sub BrickletTemperatureIRV2.SetWriteFirmwarePointer(ByVal pointer As Long)

Sets the firmware pointer for WriteFirmware(). The pointer has to be increased by chunks of size 64. The data is written to flash every 4 chunks (which equals to one page of size 256).

This function is used by Brick Viewer during flashing. It should not be necessary to call it in a normal user program.

Function BrickletTemperatureIRV2.WriteFirmware(ByVal data() As Byte) As Byte

Writes 64 Bytes of firmware at the position as written by SetWriteFirmwarePointer() before. The firmware is written to flash every 4 chunks.

You can only write firmware in bootloader mode.

This function is used by Brick Viewer during flashing. It should not be necessary to call it in a normal user program.

Sub BrickletTemperatureIRV2.SetStatusLEDConfig(ByVal config As Byte)

Sets the status LED configuration. By default the LED shows communication traffic between Brick and Bricklet, it flickers once for every 10 received data packets.

You can also turn the LED permanently on/off or show a heartbeat.

If the Bricklet is in bootloader mode, the LED is will show heartbeat by default.

The following constants are available for this function:

  • BrickletTemperatureIRV2.STATUS_LED_CONFIG_OFF = 0
  • BrickletTemperatureIRV2.STATUS_LED_CONFIG_ON = 1
  • BrickletTemperatureIRV2.STATUS_LED_CONFIG_SHOW_HEARTBEAT = 2
  • BrickletTemperatureIRV2.STATUS_LED_CONFIG_SHOW_STATUS = 3
Function BrickletTemperatureIRV2.GetStatusLEDConfig() As Byte

Returns the configuration as set by SetStatusLEDConfig()

The following constants are available for this function:

  • BrickletTemperatureIRV2.STATUS_LED_CONFIG_OFF = 0
  • BrickletTemperatureIRV2.STATUS_LED_CONFIG_ON = 1
  • BrickletTemperatureIRV2.STATUS_LED_CONFIG_SHOW_HEARTBEAT = 2
  • BrickletTemperatureIRV2.STATUS_LED_CONFIG_SHOW_STATUS = 3
Function BrickletTemperatureIRV2.GetChipTemperature() As Short

Returns the temperature in °C as measured inside the microcontroller. The value returned is not the ambient temperature!

The temperature is only proportional to the real temperature and it has bad accuracy. Practically it is only useful as an indicator for temperature changes.

Sub BrickletTemperatureIRV2.Reset()

Calling this function will reset the Bricklet. All configurations will be lost.

After a reset you have to create new device objects, calling functions on the existing ones will result in undefined behavior!

Sub BrickletTemperatureIRV2.WriteUID(ByVal uid As Long)

Writes a new UID into flash. If you want to set a new UID you have to decode the Base58 encoded UID string into an integer first.

We recommend that you use Brick Viewer to change the UID.

Function BrickletTemperatureIRV2.ReadUID() As Long

Returns the current UID as an integer. Encode as Base58 to get the usual string version.

Sub BrickletTemperatureIRV2.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)

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 BrickletTemperatureIRV2.SetAmbientTemperatureCallbackConfiguration(ByVal period As Long, ByVal valueHasToChange As Boolean, ByVal option As Char, ByVal min As Short, ByVal max As Short)

The period in ms is the period with which the AmbientTemperatureCallback callback is triggered periodically. A value of 0 turns the callback off.

If the value has to change-parameter is set to true, the callback is only triggered after the value has changed. If the value didn't change within the period, the callback is triggered immediately on change.

If it is set to false, the callback is continuously triggered with the period, independent of the value.

It is furthermore possible to constrain the callback with thresholds.

The option-parameter together with min/max sets a threshold for the AmbientTemperatureCallback callback.

The following options are possible:

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

If the option is set to 'x' (threshold turned off) the callback is triggered with the fixed period.

The default value is (0, false, 'x', 0, 0).

The following constants are available for this function:

  • BrickletTemperatureIRV2.THRESHOLD_OPTION_OFF = "x"C
  • BrickletTemperatureIRV2.THRESHOLD_OPTION_OUTSIDE = "o"C
  • BrickletTemperatureIRV2.THRESHOLD_OPTION_INSIDE = "i"C
  • BrickletTemperatureIRV2.THRESHOLD_OPTION_SMALLER = "<"C
  • BrickletTemperatureIRV2.THRESHOLD_OPTION_GREATER = ">"C
Sub BrickletTemperatureIRV2.GetAmbientTemperatureCallbackConfiguration(ByRef period As Long, ByRef valueHasToChange As Boolean, ByRef option As Char, ByRef min As Short, ByRef max As Short)

Returns the callback configuration as set by SetAmbientTemperatureCallbackConfiguration().

The following constants are available for this function:

  • BrickletTemperatureIRV2.THRESHOLD_OPTION_OFF = "x"C
  • BrickletTemperatureIRV2.THRESHOLD_OPTION_OUTSIDE = "o"C
  • BrickletTemperatureIRV2.THRESHOLD_OPTION_INSIDE = "i"C
  • BrickletTemperatureIRV2.THRESHOLD_OPTION_SMALLER = "<"C
  • BrickletTemperatureIRV2.THRESHOLD_OPTION_GREATER = ">"C
Sub BrickletTemperatureIRV2.SetObjectTemperatureCallbackConfiguration(ByVal period As Long, ByVal valueHasToChange As Boolean, ByVal option As Char, ByVal min As Short, ByVal max As Short)

The period in ms is the period with which the ObjectTemperatureCallback callback is triggered periodically. A value of 0 turns the callback off.

If the value has to change-parameter is set to true, the callback is only triggered after the value has changed. If the value didn't change within the period, the callback is triggered immediately on change.

If it is set to false, the callback is continuously triggered with the period, independent of the value.

It is furthermore possible to constrain the callback with thresholds.

The option-parameter together with min/max sets a threshold for the ObjectTemperatureCallback callback.

The following options are possible:

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

If the option is set to 'x' (threshold turned off) the callback is triggered with the fixed period.

The default value is (0, false, 'x', 0, 0).

The following constants are available for this function:

  • BrickletTemperatureIRV2.THRESHOLD_OPTION_OFF = "x"C
  • BrickletTemperatureIRV2.THRESHOLD_OPTION_OUTSIDE = "o"C
  • BrickletTemperatureIRV2.THRESHOLD_OPTION_INSIDE = "i"C
  • BrickletTemperatureIRV2.THRESHOLD_OPTION_SMALLER = "<"C
  • BrickletTemperatureIRV2.THRESHOLD_OPTION_GREATER = ">"C
Sub BrickletTemperatureIRV2.GetObjectTemperatureCallbackConfiguration(ByRef period As Long, ByRef valueHasToChange As Boolean, ByRef option As Char, ByRef min As Short, ByRef max As Short)

Returns the callback configuration as set by SetObjectTemperatureCallbackConfiguration().

The following constants are available for this function:

  • BrickletTemperatureIRV2.THRESHOLD_OPTION_OFF = "x"C
  • BrickletTemperatureIRV2.THRESHOLD_OPTION_OUTSIDE = "o"C
  • BrickletTemperatureIRV2.THRESHOLD_OPTION_INSIDE = "i"C
  • BrickletTemperatureIRV2.THRESHOLD_OPTION_SMALLER = "<"C
  • BrickletTemperatureIRV2.THRESHOLD_OPTION_GREATER = ">"C

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 BrickletTemperatureIRV2, ByVal value As Short)
    Console.WriteLine("Value: {0}", value)
End Sub

AddHandler temperatureIRV2.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 BrickletTemperatureIRV2.AmbientTemperatureCallback(ByVal sender As BrickletTemperatureIRV2, ByVal temperature As Short)

This callback is triggered periodically according to the configuration set by SetAmbientTemperatureCallbackConfiguration().

The parameter is the same as GetAmbientTemperature().

Event BrickletTemperatureIRV2.ObjectTemperatureCallback(ByVal sender As BrickletTemperatureIRV2, ByVal temperature As Short)

This callback is triggered periodically according to the configuration set by SetObjectTemperatureCallbackConfiguration().

The parameter is the same as GetObjectTemperature().

Constants

Const BrickletTemperatureIRV2.DEVICE_IDENTIFIER

This constant is used to identify a Temperature IR Bricklet 2.0.

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

Const BrickletTemperatureIRV2.DEVICE_DISPLAY_NAME

This constant represents the human readable name of a Temperature IR Bricklet 2.0.