Go - CO2 Bricklet¶

Simple¶

Download (example_simple.go)

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package main

import (
    "fmt"
    "github.com/Tinkerforge/go-api-bindings/co2_bricklet"
    "github.com/Tinkerforge/go-api-bindings/ipconnection"
)

const ADDR string = "localhost:4223"
const UID string = "XYZ" // Change XYZ to the UID of your CO2 Bricklet.

func main() {
    ipcon := ipconnection.New()
    defer ipcon.Close()
    co2, _ := co2_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 CO2 concentration.
    co2Concentration, _ := co2.GetCO2Concentration()
    fmt.Printf("CO2 Concentration: %d ppm\n", co2Concentration)

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

Callback¶

Download (example_callback.go)

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package main

import (
    "fmt"
    "github.com/Tinkerforge/go-api-bindings/co2_bricklet"
    "github.com/Tinkerforge/go-api-bindings/ipconnection"
)

const ADDR string = "localhost:4223"
const UID string = "XYZ" // Change XYZ to the UID of your CO2 Bricklet.

func main() {
    ipcon := ipconnection.New()
    defer ipcon.Close()
    co2, _ := co2_bricklet.New(UID, &ipcon) // Create device object.

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

    co2.RegisterCO2ConcentrationCallback(func(co2Concentration uint16) {
        fmt.Printf("CO2 Concentration: %d ppm\n", co2Concentration)
    })

    // Set period for CO2 concentration receiver to 1s (1000ms).
    // Note: The CO2 concentration callback is only called every second
    //       if the CO2 concentration has changed since the last call!
    co2.SetCO2ConcentrationCallbackPeriod(1000)

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

Threshold¶

Download (example_threshold.go)

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package main

import (
    "fmt"
    "github.com/Tinkerforge/go-api-bindings/co2_bricklet"
    "github.com/Tinkerforge/go-api-bindings/ipconnection"
)

const ADDR string = "localhost:4223"
const UID string = "XYZ" // Change XYZ to the UID of your CO2 Bricklet.

func main() {
    ipcon := ipconnection.New()
    defer ipcon.Close()
    co2, _ := co2_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).
    co2.SetDebouncePeriod(10000)

    co2.RegisterCO2ConcentrationReachedCallback(func(co2Concentration uint16) {
        fmt.Printf("CO2 Concentration: %d ppm\n", co2Concentration)
    })

    // Configure threshold for CO2 concentration "greater than 750 ppm".
    co2.SetCO2ConcentrationCallbackThreshold('>', 750, 0)

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

Basic Functions¶

func co2_bricklet.New(uid string, ipcon *IPConnection) (device CO2Bricklet, err error)¶

Parameters:	uid – Type: string ipcon – Type: *IPConnection
Returns:	device – Type: CO2Bricklet err – Type: error

Creates a new CO2Bricklet object with the unique device ID uid and adds it to the IPConnection ipcon:

device, err := co2_bricklet.New("YOUR_DEVICE_UID", &ipcon)

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

func (*CO2Bricklet) GetCO2Concentration() (co2Concentration uint16, err error)¶

Returns:	co2Concentration – Type: uint16, Unit: 1 ppm, Range: [0 to 10000] err – Type: error

Returns the measured CO2 concentration.

If you want to get the CO2 concentration periodically, it is recommended to use the CO2ConcentrationCallback callback and set the period with SetCO2ConcentrationCallbackPeriod().

Advanced Functions¶

func (*CO2Bricklet) 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 (*CO2Bricklet) SetCO2ConcentrationCallbackPeriod(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 CO2ConcentrationCallback callback is triggered periodically. A value of 0 turns the callback off.

The CO2ConcentrationCallback callback is only triggered if the CO2 concentration has changed since the last triggering.

func (*CO2Bricklet) GetCO2ConcentrationCallbackPeriod() (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 SetCO2ConcentrationCallbackPeriod().

func (*CO2Bricklet) SetCO2ConcentrationCallbackThreshold(option rune, min uint16, max uint16) (err error)¶

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

Sets the thresholds for the CO2ConcentrationReachedCallback callback.

The following options are possible:

Option	Description
'x'	Callback is turned off
'o'	Callback is triggered when the CO2 concentration is outside the min and max values
'i'	Callback is triggered when the CO2 concentration is inside the min and max values
'<'	Callback is triggered when the CO2 concentration is smaller than the min value (max is ignored)
'>'	Callback is triggered when the CO2 concentration is greater than the min value (max is ignored)

The following constants are available for this function:

For option:

• co2_bricklet.ThresholdOptionOff = 'x'
• co2_bricklet.ThresholdOptionOutside = 'o'
• co2_bricklet.ThresholdOptionInside = 'i'
• co2_bricklet.ThresholdOptionSmaller = '<'
• co2_bricklet.ThresholdOptionGreater = '>'

func (*CO2Bricklet) GetCO2ConcentrationCallbackThreshold() (option rune, min uint16, max uint16, err error)¶

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

Returns the threshold as set by SetCO2ConcentrationCallbackThreshold().

The following constants are available for this function:

For option:

• co2_bricklet.ThresholdOptionOff = 'x'
• co2_bricklet.ThresholdOptionOutside = 'o'
• co2_bricklet.ThresholdOptionInside = 'i'
• co2_bricklet.ThresholdOptionSmaller = '<'
• co2_bricklet.ThresholdOptionGreater = '>'

func (*CO2Bricklet) 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 callbacks

• CO2ConcentrationReachedCallback,

are triggered, if the thresholds

• SetCO2ConcentrationCallbackThreshold(),

keep being reached.

func (*CO2Bricklet) 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 (*CO2Bricklet) RegisterCO2ConcentrationCallback(func(co2Concentration uint16)) (registrationId uint64)¶

Callback Parameters:	co2Concentration – Type: uint16, Unit: 1 ppm, Range: [0 to 10000]
Returns:	registrationId – Type: uint64

This callback is triggered periodically with the period that is set by SetCO2ConcentrationCallbackPeriod(). The callback parameter is the CO2 concentration of the sensor.

The CO2ConcentrationCallback callback is only triggered if the CO2 concentration has changed since the last triggering.

func (*CO2Bricklet) RegisterCO2ConcentrationReachedCallback(func(co2Concentration uint16)) (registrationId uint64)¶

Callback Parameters:	co2Concentration – Type: uint16, Unit: 1 ppm, Range: [0 to 10000]
Returns:	registrationId – Type: uint64

This callback is triggered when the threshold as set by SetCO2ConcentrationCallbackThreshold() is reached. The callback parameter is the CO2 concentration.

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 (*CO2Bricklet) 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 (*CO2Bricklet) 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:

• co2_bricklet.FunctionSetCO2ConcentrationCallbackPeriod = 2
• co2_bricklet.FunctionSetCO2ConcentrationCallbackThreshold = 4
• co2_bricklet.FunctionSetDebouncePeriod = 6

func (*CO2Bricklet) 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:

• co2_bricklet.FunctionSetCO2ConcentrationCallbackPeriod = 2
• co2_bricklet.FunctionSetCO2ConcentrationCallbackThreshold = 4
• co2_bricklet.FunctionSetDebouncePeriod = 6

func (*CO2Bricklet) 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¶

co2_bricklet.DeviceIdentifier¶

This constant is used to identify a CO2 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.

co2_bricklet.DeviceDisplayName¶

This constant represents the human readable name of a CO2 Bricklet.