AWARE: Linear Accelerometer

This sensor module allows us to access the current Linear Accelerometer data. The acceleration that the user is giving to the device. The total acceleration of the device is equal to gravity plus the acceleration the user imparts to the device. The data is provided by CMDeviceMotion in Core Motion library. Please check the link below for details.

Apple | Getting Processed Device-Motion Data

Apple | CMDeviceMotion | gravity

Requirements

iOS 10 or later

Installation

com.awareframework.ios.sensor.linearaccelerometer is available through CocoaPods.

1. To install it, simply add the following line to your Podfile:

pod 'com.awareframework.ios.sensor.linearaccelerometer'

2. Import com.awareframework.ios.sensor.linearaccelerometer library into your source code.

import com_awareframework_ios_sensor_linearaccelerometer

Public functions

LinearAccelerometerSensor

• init(config:LinearAccelerometerSensor.Config?) : Initializes the linear-accelerometer sensor with the optional configuration.
• start(): Starts the linear-accelerometer sensor with the optional configuration.
• stop(): Stops the service.

LinearAccelerometerSensor.Config

Class to hold the configuration of the sensor.

Fields

• sensorObserver: LinearAccelerometerObserver: Callback for live data updates.
• frequency: Int: Data samples to collect per second (Hz). (default = 5)
• period: Double: Period to save data in minutes. (default = 1)
• threshold: Double: If set, do not record consecutive points if change in value is less than the set value.
• enabled: Boolean Sensor is enabled or not. (default = false)
• debug: Boolean enable/disable logging to Xcode console. (default = false)
• label: String Label for the data. (default = "")
• deviceId: String Id of the device that will be associated with the events and the sensor. (default = "")
• dbEncryptionKey Encryption key for the database. (default = null)
• dbType: Engine Which db engine to use for saving data. (default = Engine.DatabaseType.NONE)
• dbPath: String Path of the database. (default = "aware_linear_acceleromete")
• dbHost: String Host for syncing the database. (default = null)

Broadcasts

Fired Broadcasts

• LinearAccelerometerSensor.ACTION_AWARE_GYROSCOPE fired when gyroscope saved data to db after the period ends.

Received Broadcasts

• LinearAccelerometerSensor.ACTION_AWARE_LINEAR_ACCELEROMETER_START: received broadcast to start the sensor.
• LinearAccelerometerSensor.ACTION_AWARE_LINEAR_ACCELEROMETER_STOP: received broadcast to stop the sensor.
• LinearAccelerometerSensor.ACTION_AWARE_LINEAR_ACCELEROMETER_SYNC: received broadcast to send sync attempt to the host.
• LinearAccelerometerSensor.ACTION_AWARE_LINEAR_ACCELEROMETER_SET_LABEL: received broadcast to set the data label. Label is expected in the LinearAccelerometerSensor.EXTRA_LABEL field of the intent extras.

Data Representations

LinearAccelerometer Data

Contains the raw sensor data.

Field	Type	Description
x	Double	value of X axis
y	Double	value of Y axis
z	Double	value of Z axis
label	String	Customizable label. Useful for data calibration or traceability
deviceId	String	AWARE device UUID
label	String	Customizable label. Useful for data calibration or traceability
timestamp	Int64	unixtime milliseconds since 1970
timezone	Int	Raw timezone offset of the device
os	String	Operating system of the device (ex. ios)

Example usage

var linearAccSensor = LinearAccelerometerSensor.init(LinearAccelerometerSensor.Config().apply{config in
    config.debug    = true
    config.dbType   = .REALM
    config.sensorObserver = Observer()
})
linearAccSensor.start()

class Observer:LinearAccelerometerObserver{
    func onDataChanged(data: LinearAccelerometerData) {
        // Your code here...
    }
}

Author

Yuuki Nishiyama, [email protected]

License

Copyright (c) 2021 AWARE Mobile Context Instrumentation Middleware/Framework (http://www.awareframework.com)

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.