Visual Basic .NET - PTC Bricklet 2.0

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

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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 PTC Bricklet 2.0

    Sub Main()
        Dim ipcon As New IPConnection() ' Create IP connection
        Dim ptc As New BrickletPTCV2(UID, ipcon) ' Create device object

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

        ' Get current temperature
        Dim temperature As Integer = ptc.GetTemperature()
        Console.WriteLine("Temperature: " + (temperature/100.0).ToString() + " °C")

        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 PTC Bricklet 2.0

    ' Callback subroutine for temperature callback
    Sub TemperatureCB(ByVal sender As BrickletPTCV2, ByVal temperature As Integer)
        Console.WriteLine("Temperature: " + (temperature/100.0).ToString() + " °C")
    End Sub

    Sub Main()
        Dim ipcon As New IPConnection() ' Create IP connection
        Dim ptc As New BrickletPTCV2(UID, ipcon) ' Create device object

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

        ' Register temperature callback to subroutine TemperatureCB
        AddHandler ptc.TemperatureCallback, AddressOf TemperatureCB

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

        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 PTC Bricklet 2.0

    ' Callback subroutine for temperature callback
    Sub TemperatureCB(ByVal sender As BrickletPTCV2, ByVal temperature As Integer)
        Console.WriteLine("Temperature: " + (temperature/100.0).ToString() + " °C")
    End Sub

    Sub Main()
        Dim ipcon As New IPConnection() ' Create IP connection
        Dim ptc As New BrickletPTCV2(UID, ipcon) ' Create device object

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

        ' Register temperature callback to subroutine TemperatureCB
        AddHandler ptc.TemperatureCallback, AddressOf TemperatureCB

        ' Configure threshold for temperature "greater than 30 °C"
        ' with a debounce period of 1s (1000ms)
        ptc.SetTemperatureCallbackConfiguration(1000, False, ">"C, 30*100, 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 BrickletPTCV2(ByVal uid As String, ByVal ipcon As IPConnection)

Creates an object with the unique device ID uid:

Dim ptcV2 As New BrickletPTCV2("YOUR_DEVICE_UID", ipcon)

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

Function BrickletPTCV2.GetTemperature() As Integer

Returns the temperature of the connected sensor. The value has a range of -246 to 849 °C and is given in °C/100, e.g. a value of 4223 means that a temperature of 42.23 °C is measured.

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

Function BrickletPTCV2.GetResistance() As Integer

Returns the value as measured by the MAX31865 precision delta-sigma ADC.

The value can be converted with the following formulas:

  • Pt100: resistance = (value * 390) / 32768
  • Pt1000: resistance = (value * 3900) / 32768

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

Function BrickletPTCV2.IsSensorConnected() As Boolean

Returns true if the sensor is connected correctly.

If this function returns false, there is either no Pt100 or Pt1000 sensor connected, the sensor is connected incorrectly or the sensor itself is faulty.

If you want to get the status automatically, it is recommended to use the SensorConnectedCallback callback. You can set the callback configuration with SetSensorConnectedCallbackConfiguration().

Sub BrickletPTCV2.SetWireMode(ByVal mode As Byte)

Sets the wire mode of the sensor. Possible values are 2, 3 and 4 which correspond to 2-, 3- and 4-wire sensors. The value has to match the jumper configuration on the Bricklet.

The default value is 2 = 2-wire.

The following constants are available for this function:

  • BrickletPTCV2.WIRE_MODE_2 = 2
  • BrickletPTCV2.WIRE_MODE_3 = 3
  • BrickletPTCV2.WIRE_MODE_4 = 4
Function BrickletPTCV2.GetWireMode() As Byte

Returns the wire mode as set by SetWireMode()

The following constants are available for this function:

  • BrickletPTCV2.WIRE_MODE_2 = 2
  • BrickletPTCV2.WIRE_MODE_3 = 3
  • BrickletPTCV2.WIRE_MODE_4 = 4
Sub BrickletPTCV2.SetMovingAverageConfiguration(ByVal movingAverageLengthResistance As Integer, ByVal movingAverageLengthTemperature As Integer)

Sets the length of a moving averaging for the resistance and temperature.

Setting the length to 1 will turn the averaging off. With less averaging, there is more noise on the data.

The range for the averaging is 1-1000.

New data is gathered every 20ms. With a moving average of length 1000 the resulting averaging window has a length of 20s. If you want to do long term measurements the longest moving average will give the cleanest results.

The default value is 1 for resistance and 40 for temperature. The default values match the non-changeable averaging settings of the old PTC Bricklet 1.0

Sub BrickletPTCV2.GetMovingAverageConfiguration(ByRef movingAverageLengthResistance As Integer, ByRef movingAverageLengthTemperature As Integer)

Returns the moving average configuration as set by SetMovingAverageConfiguration().

Advanced Functions

Sub BrickletPTCV2.SetNoiseRejectionFilter(ByVal filter As Byte)

Sets the noise rejection filter to either 50Hz (0) or 60Hz (1). Noise from 50Hz or 60Hz power sources (including harmonics of the AC power's fundamental frequency) is attenuated by 82dB.

Default value is 0 = 50Hz.

The following constants are available for this function:

  • BrickletPTCV2.FILTER_OPTION_50HZ = 0
  • BrickletPTCV2.FILTER_OPTION_60HZ = 1
Function BrickletPTCV2.GetNoiseRejectionFilter() As Byte

Returns the noise rejection filter option as set by SetNoiseRejectionFilter()

The following constants are available for this function:

  • BrickletPTCV2.FILTER_OPTION_50HZ = 0
  • BrickletPTCV2.FILTER_OPTION_60HZ = 1
Function BrickletPTCV2.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 BrickletPTCV2.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 BrickletPTCV2.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:

  • BrickletPTCV2.FUNCTION_SET_TEMPERATURE_CALLBACK_CONFIGURATION = 2
  • BrickletPTCV2.FUNCTION_SET_RESISTANCE_CALLBACK_CONFIGURATION = 6
  • BrickletPTCV2.FUNCTION_SET_NOISE_REJECTION_FILTER = 9
  • BrickletPTCV2.FUNCTION_SET_WIRE_MODE = 12
  • BrickletPTCV2.FUNCTION_SET_MOVING_AVERAGE_CONFIGURATION = 14
  • BrickletPTCV2.FUNCTION_SET_SENSOR_CONNECTED_CALLBACK_CONFIGURATION = 16
  • BrickletPTCV2.FUNCTION_SET_WRITE_FIRMWARE_POINTER = 237
  • BrickletPTCV2.FUNCTION_SET_STATUS_LED_CONFIG = 239
  • BrickletPTCV2.FUNCTION_RESET = 243
  • BrickletPTCV2.FUNCTION_WRITE_UID = 248
Sub BrickletPTCV2.SetResponseExpectedAll(ByVal responseExpected As Boolean)

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

Sub BrickletPTCV2.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 BrickletPTCV2.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:

  • BrickletPTCV2.BOOTLOADER_MODE_BOOTLOADER = 0
  • BrickletPTCV2.BOOTLOADER_MODE_FIRMWARE = 1
  • BrickletPTCV2.BOOTLOADER_MODE_BOOTLOADER_WAIT_FOR_REBOOT = 2
  • BrickletPTCV2.BOOTLOADER_MODE_FIRMWARE_WAIT_FOR_REBOOT = 3
  • BrickletPTCV2.BOOTLOADER_MODE_FIRMWARE_WAIT_FOR_ERASE_AND_REBOOT = 4
  • BrickletPTCV2.BOOTLOADER_STATUS_OK = 0
  • BrickletPTCV2.BOOTLOADER_STATUS_INVALID_MODE = 1
  • BrickletPTCV2.BOOTLOADER_STATUS_NO_CHANGE = 2
  • BrickletPTCV2.BOOTLOADER_STATUS_ENTRY_FUNCTION_NOT_PRESENT = 3
  • BrickletPTCV2.BOOTLOADER_STATUS_DEVICE_IDENTIFIER_INCORRECT = 4
  • BrickletPTCV2.BOOTLOADER_STATUS_CRC_MISMATCH = 5
Function BrickletPTCV2.GetBootloaderMode() As Byte

Returns the current bootloader mode, see SetBootloaderMode().

The following constants are available for this function:

  • BrickletPTCV2.BOOTLOADER_MODE_BOOTLOADER = 0
  • BrickletPTCV2.BOOTLOADER_MODE_FIRMWARE = 1
  • BrickletPTCV2.BOOTLOADER_MODE_BOOTLOADER_WAIT_FOR_REBOOT = 2
  • BrickletPTCV2.BOOTLOADER_MODE_FIRMWARE_WAIT_FOR_REBOOT = 3
  • BrickletPTCV2.BOOTLOADER_MODE_FIRMWARE_WAIT_FOR_ERASE_AND_REBOOT = 4
Sub BrickletPTCV2.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 BrickletPTCV2.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 BrickletPTCV2.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:

  • BrickletPTCV2.STATUS_LED_CONFIG_OFF = 0
  • BrickletPTCV2.STATUS_LED_CONFIG_ON = 1
  • BrickletPTCV2.STATUS_LED_CONFIG_SHOW_HEARTBEAT = 2
  • BrickletPTCV2.STATUS_LED_CONFIG_SHOW_STATUS = 3
Function BrickletPTCV2.GetStatusLEDConfig() As Byte

Returns the configuration as set by SetStatusLEDConfig()

The following constants are available for this function:

  • BrickletPTCV2.STATUS_LED_CONFIG_OFF = 0
  • BrickletPTCV2.STATUS_LED_CONFIG_ON = 1
  • BrickletPTCV2.STATUS_LED_CONFIG_SHOW_HEARTBEAT = 2
  • BrickletPTCV2.STATUS_LED_CONFIG_SHOW_STATUS = 3
Function BrickletPTCV2.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 BrickletPTCV2.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 BrickletPTCV2.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 BrickletPTCV2.ReadUID() As Long

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

Sub BrickletPTCV2.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 BrickletPTCV2.SetTemperatureCallbackConfiguration(ByVal period As Long, ByVal valueHasToChange As Boolean, ByVal option As Char, ByVal min As Integer, ByVal max As Integer)

The period in ms is the period with which the TemperatureCallback 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 TemperatureCallback 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:

  • BrickletPTCV2.THRESHOLD_OPTION_OFF = "x"C
  • BrickletPTCV2.THRESHOLD_OPTION_OUTSIDE = "o"C
  • BrickletPTCV2.THRESHOLD_OPTION_INSIDE = "i"C
  • BrickletPTCV2.THRESHOLD_OPTION_SMALLER = "<"C
  • BrickletPTCV2.THRESHOLD_OPTION_GREATER = ">"C
Sub BrickletPTCV2.GetTemperatureCallbackConfiguration(ByRef period As Long, ByRef valueHasToChange As Boolean, ByRef option As Char, ByRef min As Integer, ByRef max As Integer)

Returns the callback configuration as set by SetTemperatureCallbackConfiguration().

The following constants are available for this function:

  • BrickletPTCV2.THRESHOLD_OPTION_OFF = "x"C
  • BrickletPTCV2.THRESHOLD_OPTION_OUTSIDE = "o"C
  • BrickletPTCV2.THRESHOLD_OPTION_INSIDE = "i"C
  • BrickletPTCV2.THRESHOLD_OPTION_SMALLER = "<"C
  • BrickletPTCV2.THRESHOLD_OPTION_GREATER = ">"C
Sub BrickletPTCV2.SetResistanceCallbackConfiguration(ByVal period As Long, ByVal valueHasToChange As Boolean, ByVal option As Char, ByVal min As Integer, ByVal max As Integer)

The period in ms is the period with which the ResistanceCallback 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 ResistanceCallback 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:

  • BrickletPTCV2.THRESHOLD_OPTION_OFF = "x"C
  • BrickletPTCV2.THRESHOLD_OPTION_OUTSIDE = "o"C
  • BrickletPTCV2.THRESHOLD_OPTION_INSIDE = "i"C
  • BrickletPTCV2.THRESHOLD_OPTION_SMALLER = "<"C
  • BrickletPTCV2.THRESHOLD_OPTION_GREATER = ">"C
Sub BrickletPTCV2.GetResistanceCallbackConfiguration(ByRef period As Long, ByRef valueHasToChange As Boolean, ByRef option As Char, ByRef min As Integer, ByRef max As Integer)

Returns the callback configuration as set by SetResistanceCallbackConfiguration().

The following constants are available for this function:

  • BrickletPTCV2.THRESHOLD_OPTION_OFF = "x"C
  • BrickletPTCV2.THRESHOLD_OPTION_OUTSIDE = "o"C
  • BrickletPTCV2.THRESHOLD_OPTION_INSIDE = "i"C
  • BrickletPTCV2.THRESHOLD_OPTION_SMALLER = "<"C
  • BrickletPTCV2.THRESHOLD_OPTION_GREATER = ">"C
Sub BrickletPTCV2.SetSensorConnectedCallbackConfiguration(ByVal enabled As Boolean)

If you enable this callback, the SensorConnectedCallback callback is triggered every time a Pt sensor is connected/disconnected.

By default this callback is disabled.

Function BrickletPTCV2.GetSensorConnectedCallbackConfiguration() As Boolean

Returns the configuration as set by SetSensorConnectedCallbackConfiguration().

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 BrickletPTCV2, ByVal value As Short)
    Console.WriteLine("Value: {0}", value)
End Sub

AddHandler ptcV2.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 BrickletPTCV2.TemperatureCallback(ByVal sender As BrickletPTCV2, ByVal temperature As Integer)

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

The parameter is the same as GetTemperature().

Event BrickletPTCV2.ResistanceCallback(ByVal sender As BrickletPTCV2, ByVal resistance As Integer)

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

The parameter is the same as GetResistance().

Event BrickletPTCV2.SensorConnectedCallback(ByVal sender As BrickletPTCV2, ByVal connected As Boolean)

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

The parameter is the same as IsSensorConnected().

Constants

Const BrickletPTCV2.DEVICE_IDENTIFIER

This constant is used to identify a PTC 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 BrickletPTCV2.DEVICE_DISPLAY_NAME

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