AWARE: Accelerometer

This sensor module allows us to manage 3-axis accelerometer data which is provided by iOS CoreMotion Library. Please check the link below for details.

An accelerometer measures changes in velocity along one axis. All iOS devices have a three-axis accelerometer, which delivers acceleration values in each of the three axes. The values reported by the accelerometers are measured in increments of the gravitational acceleration, with the value 1.0 representing an acceleration of 9.8 meters per second (per second) in the given direction. Acceleration values may be positive or negative depending on the direction of the acceleration.

Apple | Getting Raw Accelerometer Events

Requirements

iOS 10 or later

Installation

com.aware.ios.sensor.accelerometer is available through CocoaPods. To install it, simply add the following line to your Podfile:

pod 'com.awareframework.ios.sensor.accelerometer'

Import com.awareframework.ios.sensor.accelerometer library into your source code.

import com_awareframework_ios_sensor_accelerometer

Public functions

AccelerometerSensor

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

AccelerometerSensor.Config

Class to hold the configuration of the sensor.

Fields

• sensorObserver: AccelerometerObserver: Callback for live data updates.
• frequency: Int: Data samples to collect per second (Hz). (default = 5)
• period: Float: 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 Logcat. (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_accelerometer")
• dbHost: String Host for syncing the database. (default = null)

Broadcasts

Fired Broadcasts

• AccelerometerSensor.ACTION_AWARE_ACCELEROMETER fired when accelerometer saved data to db after the period ends.

Received Broadcasts

• AccelerometerSensor.ACTION_AWARE_ACCELEROMETER_START: received broadcast to start the sensor.
• AccelerometerSensor.ACTION_AWARE_ACCELEROMETER_STOP: received broadcast to stop the sensor.
• AccelerometerSensor.ACTION_AWARE_ACCELEROMETER_SYNC: received broadcast to send sync attempt to the host.
• AccelerometerSensor.ACTION_AWARE_ACCELEROMETER_SET_LABEL: received broadcast to set the data label. Label is expected in the AccelerometerSensor.EXTRA_LABEL field of the intent extras.

Data Representations

Accelerometer Data

Contains the raw sensor data.

Example usage

Import Accelerometer sensor library (com_aware_ios_sensor_accelerometer) to your target class.

import com_awareframework_ios_sensor_accelerometer

Generate an accelerometer sensor instance and start/stop the sensor.

let accelerometer = Accelerometer.init(Accelerometer.Config().apply{ config in
   config.sensorObserver = Observer()
   config.period   = 0.5
   condig.deviceId = UUID.init().uuidString
   config.debug    = true
})

accelerometer?.start()

accelerometer?.stop()

class Observer:AccelerometerObserver{
   func onDataChanged(data: AccelerometerData){
      // Your code here...
   }
}

Author

Yuuki Nishiyama, [email protected]

Related Links

• Apple | Getting Raw Accelerometer Events
• Apple | CoreMotion

License

Copyright (c) 2018 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.