Go - Dust Detector Bricklet¶

Simple¶

Download (example_simple.go)

 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

package main

import (
    "fmt"
    "github.com/Tinkerforge/go-api-bindings/dust_detector_bricklet"
    "github.com/Tinkerforge/go-api-bindings/ipconnection"
)

const ADDR string = "localhost:4223"
const UID string = "XYZ" // Change XYZ to the UID of your Dust Detector Bricklet.

func main() {
    ipcon := ipconnection.New()
    defer ipcon.Close()
    dd, _ := dust_detector_bricklet.New(UID, &ipcon) // Create device object.

    ipcon.Connect(ADDR) // Connect to brickd.
    defer ipcon.Disconnect()
    // Don't use device before ipcon is connected.

    // Get current dust density.
    dustDensity, _ := dd.GetDustDensity()
    fmt.Printf("Dust Density: %d µg/m³\n", dustDensity)

    fmt.Print("Press enter to exit.")
    fmt.Scanln()
}

Callback¶

Download (example_callback.go)

 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

package main

import (
    "fmt"
    "github.com/Tinkerforge/go-api-bindings/dust_detector_bricklet"
    "github.com/Tinkerforge/go-api-bindings/ipconnection"
)

const ADDR string = "localhost:4223"
const UID string = "XYZ" // Change XYZ to the UID of your Dust Detector Bricklet.

func main() {
    ipcon := ipconnection.New()
    defer ipcon.Close()
    dd, _ := dust_detector_bricklet.New(UID, &ipcon) // Create device object.

    ipcon.Connect(ADDR) // Connect to brickd.
    defer ipcon.Disconnect()
    // Don't use device before ipcon is connected.

    dd.RegisterDustDensityCallback(func(dustDensity uint16) {
        fmt.Printf("Dust Density: %d µg/m³\n", dustDensity)
    })

    // Set period for dust density receiver to 1s (1000ms).
    // Note: The dust density callback is only called every second
    //       if the dust density has changed since the last call!
    dd.SetDustDensityCallbackPeriod(1000)

    fmt.Print("Press enter to exit.")
    fmt.Scanln()
}

Threshold¶

Download (example_threshold.go)

 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

package main

import (
    "fmt"
    "github.com/Tinkerforge/go-api-bindings/dust_detector_bricklet"
    "github.com/Tinkerforge/go-api-bindings/ipconnection"
)

const ADDR string = "localhost:4223"
const UID string = "XYZ" // Change XYZ to the UID of your Dust Detector Bricklet.

func main() {
    ipcon := ipconnection.New()
    defer ipcon.Close()
    dd, _ := dust_detector_bricklet.New(UID, &ipcon) // Create device object.

    ipcon.Connect(ADDR) // Connect to brickd.
    defer ipcon.Disconnect()
    // Don't use device before ipcon is connected.

    // Get threshold receivers with a debounce time of 10 seconds (10000ms).
    dd.SetDebouncePeriod(10000)

    dd.RegisterDustDensityReachedCallback(func(dustDensity uint16) {
        fmt.Printf("Dust Density: %d µg/m³\n", dustDensity)
    })

    // Configure threshold for dust density "greater than 10 µg/m³".
    dd.SetDustDensityCallbackThreshold('>', 10, 0)

    fmt.Print("Press enter to exit.")
    fmt.Scanln()
}

Basic Functions¶

func dust_detector_bricklet.New(uid string, ipcon *IPConnection) (device DustDetectorBricklet, err error)¶

Parameters:	uid – Type: string ipcon – Type: *IPConnection
Returns:	device – Type: DustDetectorBricklet err – Type: error

Creates a new DustDetectorBricklet object with the unique device ID uid and adds it to the IPConnection ipcon:

device, err := dust_detector_bricklet.New("YOUR_DEVICE_UID", &ipcon)

This device object can be used after the IPConnection has been connected.

func (*DustDetectorBricklet) GetDustDensity() (dustDensity uint16, err error)¶

Returns:	dustDensity – Type: uint16, Unit: 1 µg/m³, Range: [0 to 500] err – Type: error

Returns the dust density.

If you want to get the dust density periodically, it is recommended to use the DustDensityCallback callback and set the period with SetDustDensityCallbackPeriod().

Advanced Functions¶

func (*DustDetectorBricklet) SetMovingAverage(average uint8) (err error)¶

Parameters:	average – Type: uint8, Range: [0 to 100], Default: 100
Returns:	err – Type: error

Sets the length of a moving averaging for the dust density.

Setting the length to 0 will turn the averaging completely off. With less averaging, there is more noise on the data.

func (*DustDetectorBricklet) GetMovingAverage() (average uint8, err error)¶

Returns:	average – Type: uint8, Range: [0 to 100], Default: 100 err – Type: error

Returns the length moving average as set by SetMovingAverage().

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

Returns:

uid – Type: string, Length: up to 8 connectedUid – Type: string, Length: up to 8 position – Type: rune, Range: ['a' to 'h', 'z'] hardwareVersion – Type: [3]uint8 0: major – Type: uint8, Range: [0 to 255] 1: minor – Type: uint8, Range: [0 to 255] 2: revision – Type: uint8, Range: [0 to 255] firmwareVersion – Type: [3]uint8 0: major – Type: uint8, Range: [0 to 255] 1: minor – Type: uint8, Range: [0 to 255] 2: revision – Type: uint8, Range: [0 to 255] deviceIdentifier – Type: uint16, Range: [0 to 216 - 1] err – Type: 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 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¶

func (*DustDetectorBricklet) SetDustDensityCallbackPeriod(period uint32) (err error)¶

Parameters:	period – Type: uint32, Unit: 1 ms, Range: [0 to 232 - 1], Default: 0
Returns:	err – Type: error

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

The DustDensityCallback callback is only triggered if the dust density has changed since the last triggering.

func (*DustDetectorBricklet) GetDustDensityCallbackPeriod() (period uint32, err error)¶

Returns:	period – Type: uint32, Unit: 1 ms, Range: [0 to 232 - 1], Default: 0 err – Type: error

Returns the period as set by SetDustDensityCallbackPeriod().

func (*DustDetectorBricklet) SetDustDensityCallbackThreshold(option rune, min uint16, max uint16) (err error)¶

Parameters:	option – Type: rune, Range: See constants, Default: 'x' min – Type: uint16, Unit: 1 µg/m³, Range: [0 to 216 - 1], Default: 0 max – Type: uint16, Unit: 1 µg/m³, Range: [0 to 216 - 1], Default: 0
Returns:	err – Type: error

Sets the thresholds for the DustDensityReachedCallback callback.

The following options are possible:

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

The following constants are available for this function:

For option:

• dust_detector_bricklet.ThresholdOptionOff = 'x'
• dust_detector_bricklet.ThresholdOptionOutside = 'o'
• dust_detector_bricklet.ThresholdOptionInside = 'i'
• dust_detector_bricklet.ThresholdOptionSmaller = '<'
• dust_detector_bricklet.ThresholdOptionGreater = '>'

func (*DustDetectorBricklet) GetDustDensityCallbackThreshold() (option rune, min uint16, max uint16, err error)¶

Returns:	option – Type: rune, Range: See constants, Default: 'x' min – Type: uint16, Unit: 1 µg/m³, Range: [0 to 216 - 1], Default: 0 max – Type: uint16, Unit: 1 µg/m³, Range: [0 to 216 - 1], Default: 0 err – Type: error

Returns the threshold as set by SetDustDensityCallbackThreshold().

The following constants are available for this function:

For option:

• dust_detector_bricklet.ThresholdOptionOff = 'x'
• dust_detector_bricklet.ThresholdOptionOutside = 'o'
• dust_detector_bricklet.ThresholdOptionInside = 'i'
• dust_detector_bricklet.ThresholdOptionSmaller = '<'
• dust_detector_bricklet.ThresholdOptionGreater = '>'

func (*DustDetectorBricklet) SetDebouncePeriod(debounce uint32) (err error)¶

Parameters:	debounce – Type: uint32, Unit: 1 ms, Range: [0 to 232 - 1], Default: 100
Returns:	err – Type: error

Sets the period with which the threshold callback

• DustDensityReachedCallback

is triggered, if the threshold

• SetDustDensityCallbackThreshold()

keeps being reached.

func (*DustDetectorBricklet) GetDebouncePeriod() (debounce uint32, err error)¶

Returns:	debounce – Type: uint32, Unit: 1 ms, Range: [0 to 232 - 1], Default: 100 err – Type: error

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 with the corresponding Register*Callback function, which returns a unique callback ID. This ID can be used to deregister the callback later with the corresponding Deregister*Callback function.

func (*DustDetectorBricklet) RegisterDustDensityCallback(func(dustDensity uint16)) (registrationId uint64)¶

Callback Parameters:	dustDensity – Type: uint16, Unit: 1 µg/m³, Range: [0 to 500]
Returns:	registrationId – Type: uint64

This callback is triggered periodically with the period that is set by SetDustDensityCallbackPeriod(). The callback parameter is the dust density of the sensor.

Der DustDensityCallback callback is only triggered if the dust density value has changed since the last triggering.

func (*DustDetectorBricklet) RegisterDustDensityReachedCallback(func(dustDensity uint16)) (registrationId uint64)¶

Callback Parameters:	dustDensity – Type: uint16, Unit: 1 µg/m³, Range: [0 to 500]
Returns:	registrationId – Type: uint64

This callback is triggered when the threshold as set by SetDustDensityCallbackThreshold() is reached. The callback parameter is the dust density of the 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.

func (*DustDetectorBricklet) GetAPIVersion() (apiVersion [3]uint8, err error)¶

Returns:	apiVersion – Type: [3]uint8 0: major – Type: uint8, Range: [0 to 255] 1: minor – Type: uint8, Range: [0 to 255] 2: revision – Type: uint8, Range: [0 to 255] err – Type: error

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.

func (*DustDetectorBricklet) GetResponseExpected(functionId uint8) (responseExpected bool, err error)¶

Parameters:	functionId – Type: uint8, Range: See constants
Returns:	responseExpected – Type: bool err – Type: 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.

The following constants are available for this function:

For functionId:

• dust_detector_bricklet.FunctionSetDustDensityCallbackPeriod = 2
• dust_detector_bricklet.FunctionSetDustDensityCallbackThreshold = 4
• dust_detector_bricklet.FunctionSetDebouncePeriod = 6
• dust_detector_bricklet.FunctionSetMovingAverage = 10

func (*DustDetectorBricklet) SetResponseExpected(functionId uint8, responseExpected bool) (err error)¶

Parameters:	functionId – Type: uint8, Range: See constants responseExpected – Type: bool
Returns:	err – Type: 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.

The following constants are available for this function:

For functionId:

• dust_detector_bricklet.FunctionSetDustDensityCallbackPeriod = 2
• dust_detector_bricklet.FunctionSetDustDensityCallbackThreshold = 4
• dust_detector_bricklet.FunctionSetDebouncePeriod = 6
• dust_detector_bricklet.FunctionSetMovingAverage = 10

func (*DustDetectorBricklet) SetResponseExpectedAll(responseExpected bool) (err error)¶

Parameters:	responseExpected – Type: bool
Returns:	err – Type: error

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

Constants¶

dust_detector_bricklet.DeviceIdentifier¶

This constant is used to identify a Dust Detector Bricklet.

The GetIdentity() function and the (*IPConnection) RegisterEnumerateCallback callback of the IPConnection have a deviceIdentifier parameter to specify the Brick's or Bricklet's type.

dust_detector_bricklet.DeviceDisplayName¶

This constant represents the human readable name of a Dust Detector Bricklet.