sound_pressure_level_bricklet

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 Go to latest Published: Feb 27, 2024 License: CC0-1.0 Imports: 5 Imported by: 0

Documentation

Overview

Measures Sound Pressure Level in dB(A/B/C/D/Z).

See also the documentation here: https://www.tinkerforge.com/en/doc/Software/Bricklets/SoundPressureLevel_Bricklet_Go.html.

Index

Constants

View Source 
const DeviceDisplayName = "Sound Pressure Level Bricklet"
View Source 
const DeviceIdentifier = 290

Variables

This section is empty.

Functions

This section is empty.

Types

type BootloaderMode 

type BootloaderMode = uint8
const (
	BootloaderModeBootloader                    BootloaderMode = 0
	BootloaderModeFirmware                      BootloaderMode = 1
	BootloaderModeBootloaderWaitForReboot       BootloaderMode = 2
	BootloaderModeFirmwareWaitForReboot         BootloaderMode = 3
	BootloaderModeFirmwareWaitForEraseAndReboot BootloaderMode = 4
)

type BootloaderStatus 

type BootloaderStatus = uint8
const (
	BootloaderStatusOK                        BootloaderStatus = 0
	BootloaderStatusInvalidMode               BootloaderStatus = 1
	BootloaderStatusNoChange                  BootloaderStatus = 2
	BootloaderStatusEntryFunctionNotPresent   BootloaderStatus = 3
	BootloaderStatusDeviceIdentifierIncorrect BootloaderStatus = 4
	BootloaderStatusCRCMismatch               BootloaderStatus = 5
)

type FFTSize 

type FFTSize = uint8
const (
	FFTSize128  FFTSize = 0
	FFTSize256  FFTSize = 1
	FFTSize512  FFTSize = 2
	FFTSize1024 FFTSize = 3
)

type Function 

type Function = uint8
const (
	FunctionGetDecibel                       Function = 1
	FunctionSetDecibelCallbackConfiguration  Function = 2
	FunctionGetDecibelCallbackConfiguration  Function = 3
	FunctionGetSpectrumLowLevel              Function = 5
	FunctionSetSpectrumCallbackConfiguration Function = 6
	FunctionGetSpectrumCallbackConfiguration Function = 7
	FunctionSetConfiguration                 Function = 9
	FunctionGetConfiguration                 Function = 10
	FunctionGetSPITFPErrorCount              Function = 234
	FunctionSetBootloaderMode                Function = 235
	FunctionGetBootloaderMode                Function = 236
	FunctionSetWriteFirmwarePointer          Function = 237
	FunctionWriteFirmware                    Function = 238
	FunctionSetStatusLEDConfig               Function = 239
	FunctionGetStatusLEDConfig               Function = 240
	FunctionGetChipTemperature               Function = 242
	FunctionReset                            Function = 243
	FunctionWriteUID                         Function = 248
	FunctionReadUID                          Function = 249
	FunctionGetIdentity                      Function = 255
	FunctionCallbackDecibel                  Function = 4
	FunctionCallbackSpectrumLowLevel         Function = 8
)

type SoundPressureLevelBricklet 

type SoundPressureLevelBricklet struct {
	// contains filtered or unexported fields
}

func New 

func New(uid string, ipcon *ipconnection.IPConnection) (SoundPressureLevelBricklet, error)

Creates an object with the unique device ID `uid`. This object can then be used after the IP Connection `ipcon` is connected.

func (*SoundPressureLevelBricklet) DeregisterDecibelCallback 

func (device *SoundPressureLevelBricklet) DeregisterDecibelCallback(registrationId uint64)

Remove a registered Decibel callback.

func (*SoundPressureLevelBricklet) DeregisterSpectrumCallback 

func (device *SoundPressureLevelBricklet) DeregisterSpectrumCallback(registrationId uint64)

Remove a registered Spectrum Low Level callback.

func (*SoundPressureLevelBricklet) DeregisterSpectrumLowLevelCallback 

func (device *SoundPressureLevelBricklet) DeregisterSpectrumLowLevelCallback(registrationId uint64)

Remove a registered Spectrum Low Level callback.

func (*SoundPressureLevelBricklet) GetAPIVersion 

func (device *SoundPressureLevelBricklet) GetAPIVersion() [3]uint8

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.

func (*SoundPressureLevelBricklet) GetBootloaderMode 

func (device *SoundPressureLevelBricklet) GetBootloaderMode() (mode BootloaderMode, err error)

Returns the current bootloader mode, see SetBootloaderMode.

Associated constants:

  • BootloaderModeBootloader
  • BootloaderModeFirmware
  • BootloaderModeBootloaderWaitForReboot
  • BootloaderModeFirmwareWaitForReboot
  • BootloaderModeFirmwareWaitForEraseAndReboot

func (*SoundPressureLevelBricklet) GetChipTemperature 

func (device *SoundPressureLevelBricklet) GetChipTemperature() (temperature int16, err error)

Returns the temperature 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.

func (*SoundPressureLevelBricklet) GetConfiguration 

func (device *SoundPressureLevelBricklet) GetConfiguration() (fftSize FFTSize, weighting Weighting, err error)

Returns the configuration as set by SetConfiguration.

Associated constants:

  • FFTSize128
  • FFTSize256
  • FFTSize512
  • FFTSize1024
  • WeightingA
  • WeightingB
  • WeightingC
  • WeightingD
  • WeightingZ
  • WeightingITUR468

func (*SoundPressureLevelBricklet) GetDecibel 

func (device *SoundPressureLevelBricklet) GetDecibel() (decibel uint16, err error)

Returns the measured sound pressure in decibels.

The Bricklet supports the weighting standards dB(A), dB(B), dB(C), dB(D), dB(Z) and ITU-R 468. You can configure the weighting with SetConfiguration.

By default dB(A) will be used.

If you want to get the value periodically, it is recommended to use the RegisterDecibelCallback callback. You can set the callback configuration with SetDecibelCallbackConfiguration.

func (*SoundPressureLevelBricklet) GetDecibelCallbackConfiguration 

func (device *SoundPressureLevelBricklet) GetDecibelCallbackConfiguration() (period uint32, valueHasToChange bool, option ThresholdOption, min uint16, max uint16, err error)

Returns the callback configuration as set by SetDecibelCallbackConfiguration.

Associated constants:

  • ThresholdOptionOff
  • ThresholdOptionOutside
  • ThresholdOptionInside
  • ThresholdOptionSmaller
  • ThresholdOptionGreater

func (*SoundPressureLevelBricklet) GetIdentity 

func (device *SoundPressureLevelBricklet) GetIdentity() (uid string, connectedUid string, position rune, hardwareVersion [3]uint8, firmwareVersion [3]uint8, deviceIdentifier uint16, err error)

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 <isolator_bricklet>` is always at position 'z'.

The device identifier numbers can be found `here <device_identifier>`. |device_identifier_constant|

func (*SoundPressureLevelBricklet) GetResponseExpected 

func (device *SoundPressureLevelBricklet) GetResponseExpected(functionID Function) (bool, error)

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.

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

func (*SoundPressureLevelBricklet) GetSPITFPErrorCount 

func (device *SoundPressureLevelBricklet) GetSPITFPErrorCount() (errorCountAckChecksum uint32, errorCountMessageChecksum uint32, errorCountFrame uint32, errorCountOverflow uint32, err error)

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.

func (*SoundPressureLevelBricklet) GetSpectrum 

func (device *SoundPressureLevelBricklet) GetSpectrum() (spectrum []uint16, err error)

Returns the frequency spectrum. The length of the spectrum is between 512 (FFT size 1024) and 64 (FFT size 128). See SetConfiguration.

Each array element is one bin of the FFT. The first bin is always the DC offset and the other bins have a size between 40Hz (FFT size 1024) and 320Hz (FFT size 128).

In sum the frequency of the spectrum always has a range from 0 to 20480Hz (the FFT is applied to samples with a frequency of 40960Hz).

The returned data is already equalized, which means that the microphone frequency response is compensated and the weighting function is applied (see SetConfiguration for the available weighting standards). Use dB(Z) if you need the unaltered spectrum.

The values are not in dB form yet. If you want a proper dB scale of the spectrum you have to apply the formula f(x) = 20*log10(max(1, x/sqrt(2))) on each value.

func (*SoundPressureLevelBricklet) GetSpectrumCallbackConfiguration 

func (device *SoundPressureLevelBricklet) GetSpectrumCallbackConfiguration() (period uint32, err error)

Returns the callback configuration as set by GetSpectrumCallbackConfiguration.

func (*SoundPressureLevelBricklet) GetSpectrumLowLevel 

func (device *SoundPressureLevelBricklet) GetSpectrumLowLevel() (spectrumLength uint16, spectrumChunkOffset uint16, spectrumChunkData [30]uint16, err error)

Returns the frequency spectrum. The length of the spectrum is between 512 (FFT size 1024) and 64 (FFT size 128). See SetConfiguration.

Each array element is one bin of the FFT. The first bin is always the DC offset and the other bins have a size between 40Hz (FFT size 1024) and 320Hz (FFT size 128).

In sum the frequency of the spectrum always has a range from 0 to 20480Hz (the FFT is applied to samples with a frequency of 40960Hz).

The returned data is already equalized, which means that the microphone frequency response is compensated and the weighting function is applied (see SetConfiguration for the available weighting standards). Use dB(Z) if you need the unaltered spectrum.

The values are not in dB form yet. If you want a proper dB scale of the spectrum you have to apply the formula f(x) = 20*log10(max(1, x/sqrt(2))) on each value.

func (*SoundPressureLevelBricklet) GetStatusLEDConfig 

func (device *SoundPressureLevelBricklet) GetStatusLEDConfig() (config StatusLEDConfig, err error)

Returns the configuration as set by SetStatusLEDConfig

Associated constants:

  • StatusLEDConfigOff
  • StatusLEDConfigOn
  • StatusLEDConfigShowHeartbeat
  • StatusLEDConfigShowStatus

func (*SoundPressureLevelBricklet) ReadUID 

func (device *SoundPressureLevelBricklet) ReadUID() (uid uint32, err error)

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

func (*SoundPressureLevelBricklet) RegisterDecibelCallback 

func (device *SoundPressureLevelBricklet) RegisterDecibelCallback(fn func(uint16)) uint64

This callback is triggered periodically according to the configuration set by SetDecibelCallbackConfiguration.

The parameter is the same as GetDecibel.

func (*SoundPressureLevelBricklet) RegisterSpectrumCallback 

func (device *SoundPressureLevelBricklet) RegisterSpectrumCallback(fn func([]uint16)) uint64

This callback is triggered periodically according to the configuration set by SetSpectrumCallbackConfiguration.

The parameter is the same as GetSpectrum.

Note 

If reconstructing the value fails, the callback is triggered with nil for spectrum.

func (*SoundPressureLevelBricklet) RegisterSpectrumLowLevelCallback 

func (device *SoundPressureLevelBricklet) RegisterSpectrumLowLevelCallback(fn func(uint16, uint16, [30]uint16)) uint64

See RegisterSpectrumCallback

func (*SoundPressureLevelBricklet) Reset 

func (device *SoundPressureLevelBricklet) Reset() (err error)

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!

func (*SoundPressureLevelBricklet) SetBootloaderMode 

func (device *SoundPressureLevelBricklet) SetBootloaderMode(mode BootloaderMode) (status BootloaderStatus, err error)

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.

Associated constants:

  • BootloaderModeBootloader
  • BootloaderModeFirmware
  • BootloaderModeBootloaderWaitForReboot
  • BootloaderModeFirmwareWaitForReboot
  • BootloaderModeFirmwareWaitForEraseAndReboot
  • BootloaderStatusOK
  • BootloaderStatusInvalidMode
  • BootloaderStatusNoChange
  • BootloaderStatusEntryFunctionNotPresent
  • BootloaderStatusDeviceIdentifierIncorrect
  • BootloaderStatusCRCMismatch

func (*SoundPressureLevelBricklet) SetConfiguration 

func (device *SoundPressureLevelBricklet) SetConfiguration(fftSize FFTSize, weighting Weighting) (err error)

Sets the Sound Pressure Level Bricklet configuration.

With different FFT sizes the Bricklet has a different amount of samples per second and the size of the FFT bins changes. The higher the FFT size the more precise is the result of the dB(X) calculation.

Available FFT sizes are:

* 1024: 512 bins, 10 samples per second, each bin has size 40Hz * 512: 256 bins, 20 samples per second, each bin has size 80Hz * 256: 128 bins, 40 samples per second, each bin has size 160Hz * 128: 64 bins, 80 samples per second, each bin has size 320Hz

The Bricklet supports different weighting functions. You can choose between dB(A), dB(B), dB(C), dB(D), dB(Z) and ITU-R 468.

dB(A/B/C/D) are the standard dB weighting curves. dB(A) is often used to measure volumes at concerts etc. dB(Z) has a flat response, no weighting is applied. ITU-R 468 is an ITU weighting standard mostly used in the UK and Europe.

Associated constants:

  • FFTSize128
  • FFTSize256
  • FFTSize512
  • FFTSize1024
  • WeightingA
  • WeightingB
  • WeightingC
  • WeightingD
  • WeightingZ
  • WeightingITUR468

func (*SoundPressureLevelBricklet) SetDecibelCallbackConfiguration 

func (device *SoundPressureLevelBricklet) SetDecibelCallbackConfiguration(period uint32, valueHasToChange bool, option ThresholdOption, min uint16, max uint16) (err error)

The period is the period with which the RegisterDecibelCallback 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 RegisterDecibelCallback 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.

Associated constants:

  • ThresholdOptionOff
  • ThresholdOptionOutside
  • ThresholdOptionInside
  • ThresholdOptionSmaller
  • ThresholdOptionGreater

func (*SoundPressureLevelBricklet) SetResponseExpected 

func (device *SoundPressureLevelBricklet) SetResponseExpected(functionID Function, responseExpected bool) error

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.

func (*SoundPressureLevelBricklet) SetResponseExpectedAll 

func (device *SoundPressureLevelBricklet) SetResponseExpectedAll(responseExpected bool)

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

func (*SoundPressureLevelBricklet) SetSpectrumCallbackConfiguration 

func (device *SoundPressureLevelBricklet) SetSpectrumCallbackConfiguration(period uint32) (err error)

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

Every new measured spectrum will be send at most once. Set the period to 1 to make sure that you get every spectrum.

func (*SoundPressureLevelBricklet) SetStatusLEDConfig 

func (device *SoundPressureLevelBricklet) SetStatusLEDConfig(config StatusLEDConfig) (err error)

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.

Associated constants:

  • StatusLEDConfigOff
  • StatusLEDConfigOn
  • StatusLEDConfigShowHeartbeat
  • StatusLEDConfigShowStatus

func (*SoundPressureLevelBricklet) SetWriteFirmwarePointer 

func (device *SoundPressureLevelBricklet) SetWriteFirmwarePointer(pointer uint32) (err error)

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.

func (*SoundPressureLevelBricklet) WriteFirmware 

func (device *SoundPressureLevelBricklet) WriteFirmware(data [64]uint8) (status uint8, err error)

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.

func (*SoundPressureLevelBricklet) WriteUID 

func (device *SoundPressureLevelBricklet) WriteUID(uid uint32) (err error)

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.

type StatusLEDConfig 

type StatusLEDConfig = uint8
const (
	StatusLEDConfigOff           StatusLEDConfig = 0
	StatusLEDConfigOn            StatusLEDConfig = 1
	StatusLEDConfigShowHeartbeat StatusLEDConfig = 2
	StatusLEDConfigShowStatus    StatusLEDConfig = 3
)

type ThresholdOption 

type ThresholdOption = rune
const (
	ThresholdOptionOff     ThresholdOption = 'x'
	ThresholdOptionOutside ThresholdOption = 'o'
	ThresholdOptionInside  ThresholdOption = 'i'
	ThresholdOptionSmaller ThresholdOption = '<'
	ThresholdOptionGreater ThresholdOption = '>'
)

type Weighting 

type Weighting = uint8
const (
	WeightingA       Weighting = 0
	WeightingB       Weighting = 1
	WeightingC       Weighting = 2
	WeightingD       Weighting = 3
	WeightingZ       Weighting = 4
	WeightingITUR468 Weighting = 5
)

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