Documentation ¶
Overview ¶
Measures weight with a load cell.
See also the documentation here: https://www.tinkerforge.com/en/doc/Software/Bricklets/LoadCell_Bricklet_Go.html.
Index ¶
- Constants
- type Function
- type Gain
- type LoadCellBricklet
- func (device *LoadCellBricklet) Calibrate(weight uint32) (err error)
- func (device *LoadCellBricklet) DeregisterWeightCallback(registrationId uint64)
- func (device *LoadCellBricklet) DeregisterWeightReachedCallback(registrationId uint64)
- func (device *LoadCellBricklet) GetAPIVersion() [3]uint8
- func (device *LoadCellBricklet) GetConfiguration() (rate Rate, gain Gain, err error)
- func (device *LoadCellBricklet) GetDebouncePeriod() (debounce uint32, err error)
- func (device *LoadCellBricklet) GetIdentity() (uid string, connectedUid string, position rune, hardwareVersion [3]uint8, ...)
- func (device *LoadCellBricklet) GetMovingAverage() (average uint8, err error)
- func (device *LoadCellBricklet) GetResponseExpected(functionID Function) (bool, error)
- func (device *LoadCellBricklet) GetWeight() (weight int32, err error)
- func (device *LoadCellBricklet) GetWeightCallbackPeriod() (period uint32, err error)
- func (device *LoadCellBricklet) GetWeightCallbackThreshold() (option ThresholdOption, min int32, max int32, err error)
- func (device *LoadCellBricklet) IsLEDOn() (on bool, err error)
- func (device *LoadCellBricklet) LEDOff() (err error)
- func (device *LoadCellBricklet) LEDOn() (err error)
- func (device *LoadCellBricklet) RegisterWeightCallback(fn func(int32)) uint64
- func (device *LoadCellBricklet) RegisterWeightReachedCallback(fn func(int32)) uint64
- func (device *LoadCellBricklet) SetConfiguration(rate Rate, gain Gain) (err error)
- func (device *LoadCellBricklet) SetDebouncePeriod(debounce uint32) (err error)
- func (device *LoadCellBricklet) SetMovingAverage(average uint8) (err error)
- func (device *LoadCellBricklet) SetResponseExpected(functionID Function, responseExpected bool) error
- func (device *LoadCellBricklet) SetResponseExpectedAll(responseExpected bool)
- func (device *LoadCellBricklet) SetWeightCallbackPeriod(period uint32) (err error)
- func (device *LoadCellBricklet) SetWeightCallbackThreshold(option ThresholdOption, min int32, max int32) (err error)
- func (device *LoadCellBricklet) Tare() (err error)
- type Rate
- type ThresholdOption
Constants ¶
const DeviceDisplayName = "Load Cell Bricklet"
const DeviceIdentifier = 253
Variables ¶
This section is empty.
Functions ¶
This section is empty.
Types ¶
type Function ¶
type Function = uint8
const ( FunctionGetWeight Function = 1 FunctionSetWeightCallbackPeriod Function = 2 FunctionGetWeightCallbackPeriod Function = 3 FunctionSetWeightCallbackThreshold Function = 4 FunctionGetWeightCallbackThreshold Function = 5 FunctionSetDebouncePeriod Function = 6 FunctionGetDebouncePeriod Function = 7 FunctionSetMovingAverage Function = 8 FunctionGetMovingAverage Function = 9 FunctionLEDOn Function = 10 FunctionLEDOff Function = 11 FunctionIsLEDOn Function = 12 FunctionCalibrate Function = 13 FunctionTare Function = 14 FunctionSetConfiguration Function = 15 FunctionGetConfiguration Function = 16 FunctionGetIdentity Function = 255 FunctionCallbackWeight Function = 17 FunctionCallbackWeightReached Function = 18 )
type LoadCellBricklet ¶
type LoadCellBricklet struct {
// contains filtered or unexported fields
}
func New ¶
func New(uid string, ipcon *ipconnection.IPConnection) (LoadCellBricklet, error)
Creates an object with the unique device ID `uid`. This object can then be used after the IP Connection `ipcon` is connected.
func (*LoadCellBricklet) Calibrate ¶
func (device *LoadCellBricklet) Calibrate(weight uint32) (err error)
To calibrate your Load Cell Bricklet you have to
* empty the scale and call this function with 0 and * add a known weight to the scale and call this function with the weight.
The calibration is saved in the EEPROM of the Bricklet and only needs to be done once.
We recommend to use the Brick Viewer for calibration, you don't need to call this function in your source code.
func (*LoadCellBricklet) DeregisterWeightCallback ¶
func (device *LoadCellBricklet) DeregisterWeightCallback(registrationId uint64)
Remove a registered Weight callback.
func (*LoadCellBricklet) DeregisterWeightReachedCallback ¶
func (device *LoadCellBricklet) DeregisterWeightReachedCallback(registrationId uint64)
Remove a registered Weight Reached callback.
func (*LoadCellBricklet) GetAPIVersion ¶
func (device *LoadCellBricklet) 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 (*LoadCellBricklet) GetConfiguration ¶
func (device *LoadCellBricklet) GetConfiguration() (rate Rate, gain Gain, err error)
Returns the configuration as set by SetConfiguration.
Associated constants:
- Rate10Hz
- Rate80Hz
- Gain128x
- Gain64x
- Gain32x
func (*LoadCellBricklet) GetDebouncePeriod ¶
func (device *LoadCellBricklet) GetDebouncePeriod() (debounce uint32, err error)
Returns the debounce period as set by SetDebouncePeriod.
func (*LoadCellBricklet) GetIdentity ¶
func (device *LoadCellBricklet) 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 (*LoadCellBricklet) GetMovingAverage ¶
func (device *LoadCellBricklet) GetMovingAverage() (average uint8, err error)
Returns the length moving average as set by SetMovingAverage.
func (*LoadCellBricklet) GetResponseExpected ¶
func (device *LoadCellBricklet) 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 (*LoadCellBricklet) GetWeight ¶
func (device *LoadCellBricklet) GetWeight() (weight int32, err error)
Returns the currently measured weight.
If you want to get the weight periodically, it is recommended to use the RegisterWeightCallback callback and set the period with SetWeightCallbackPeriod.
func (*LoadCellBricklet) GetWeightCallbackPeriod ¶
func (device *LoadCellBricklet) GetWeightCallbackPeriod() (period uint32, err error)
Returns the period as set by SetWeightCallbackPeriod.
func (*LoadCellBricklet) GetWeightCallbackThreshold ¶
func (device *LoadCellBricklet) GetWeightCallbackThreshold() (option ThresholdOption, min int32, max int32, err error)
Returns the threshold as set by SetWeightCallbackThreshold.
Associated constants:
- ThresholdOptionOff
- ThresholdOptionOutside
- ThresholdOptionInside
- ThresholdOptionSmaller
- ThresholdOptionGreater
func (*LoadCellBricklet) IsLEDOn ¶
func (device *LoadCellBricklet) IsLEDOn() (on bool, err error)
Returns *true* if the led is on, *false* otherwise.
func (*LoadCellBricklet) LEDOff ¶
func (device *LoadCellBricklet) LEDOff() (err error)
Turns the LED off.
func (*LoadCellBricklet) LEDOn ¶
func (device *LoadCellBricklet) LEDOn() (err error)
Turns the LED on.
func (*LoadCellBricklet) RegisterWeightCallback ¶
func (device *LoadCellBricklet) RegisterWeightCallback(fn func(int32)) uint64
This callback is triggered periodically with the period that is set by SetWeightCallbackPeriod. The parameter is the weight as measured by the load cell.
The RegisterWeightCallback callback is only triggered if the weight has changed since the last triggering.
func (*LoadCellBricklet) RegisterWeightReachedCallback ¶
func (device *LoadCellBricklet) RegisterWeightReachedCallback(fn func(int32)) uint64
This callback is triggered when the threshold as set by SetWeightCallbackThreshold is reached. The parameter is the weight as measured by the load cell.
If the threshold keeps being reached, the callback is triggered periodically with the period as set by SetDebouncePeriod.
func (*LoadCellBricklet) SetConfiguration ¶
func (device *LoadCellBricklet) SetConfiguration(rate Rate, gain Gain) (err error)
The measurement rate and gain are configurable.
The rate can be either 10Hz or 80Hz. A faster rate will produce more noise. It is additionally possible to add a moving average (see SetMovingAverage) to the measurements.
The gain can be 128x, 64x or 32x. It represents a measurement range of ±20mV, ±40mV and ±80mV respectively. The Load Cell Bricklet uses an excitation voltage of 5V and most load cells use an output of 2mV/V. That means the voltage range is ±15mV for most load cells (i.e. gain of 128x is best). If you don't know what all of this means you should keep it at 128x, it will most likely be correct.
The configuration is saved in the EEPROM of the Bricklet and only needs to be done once.
We recommend to use the Brick Viewer for configuration, you don't need to call this function in your source code.
Associated constants:
- Rate10Hz
- Rate80Hz
- Gain128x
- Gain64x
- Gain32x
func (*LoadCellBricklet) SetDebouncePeriod ¶
func (device *LoadCellBricklet) SetDebouncePeriod(debounce uint32) (err error)
Sets the period with which the threshold callback
* RegisterWeightReachedCallback
is triggered, if the threshold
* SetWeightCallbackThreshold
keeps being reached.
func (*LoadCellBricklet) SetMovingAverage ¶
func (device *LoadCellBricklet) SetMovingAverage(average uint8) (err error)
Sets the length of a https://en.wikipedia.org/wiki/Moving_average for the weight value.
Setting the length to 1 will turn the averaging off. With less averaging, there is more noise on the data.
func (*LoadCellBricklet) SetResponseExpected ¶
func (device *LoadCellBricklet) 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 (*LoadCellBricklet) SetResponseExpectedAll ¶
func (device *LoadCellBricklet) SetResponseExpectedAll(responseExpected bool)
Changes the response expected flag for all setter and callback configuration functions of this device at once.
func (*LoadCellBricklet) SetWeightCallbackPeriod ¶
func (device *LoadCellBricklet) SetWeightCallbackPeriod(period uint32) (err error)
Sets the period with which the RegisterWeightCallback callback is triggered periodically. A value of 0 turns the callback off.
The RegisterWeightCallback callback is only triggered if the weight has changed since the last triggering.
func (*LoadCellBricklet) SetWeightCallbackThreshold ¶
func (device *LoadCellBricklet) SetWeightCallbackThreshold(option ThresholdOption, min int32, max int32) (err error)
Sets the thresholds for the RegisterWeightReachedCallback callback.
The following options are possible:
Option| Description --- | --- 'x'| Callback is turned off 'o'| Callback is triggered when the weight is *outside* the min and max values 'i'| Callback is triggered when the weight is *inside* the min and max values '<'| Callback is triggered when the weight is smaller than the min value (max is ignored) '>'| Callback is triggered when the weight is greater than the min value (max is ignored)
Associated constants:
- ThresholdOptionOff
- ThresholdOptionOutside
- ThresholdOptionInside
- ThresholdOptionSmaller
- ThresholdOptionGreater
func (*LoadCellBricklet) Tare ¶
func (device *LoadCellBricklet) Tare() (err error)
Sets the currently measured weight as tare weight.
type ThresholdOption ¶
type ThresholdOption = rune
const ( ThresholdOptionOff ThresholdOption = 'x' ThresholdOptionOutside ThresholdOption = 'o' ThresholdOptionInside ThresholdOption = 'i' ThresholdOptionSmaller ThresholdOption = '<' ThresholdOptionGreater ThresholdOption = '>' )