Webike

Data Owner: C. Gorenflo, I.Rios, L. Golab, S. Keshav Data Description: This dataset contains data collected through the University of Waterloo’s WeBike field trial, which includes e-bike trips and battery charging sessions spanning from summer 2014 until spring 2017. 31 participants were each given an e-bike, and the e-bikes are monitored by our custom-built kit. The Samsung Galaxy S-III smart phone provides the angular speed and acceleration in all 3 axes through Android’s standard API; Phidget voltage sensor measures the battery voltage, a Phidget current transducer measures the battery charging current, a Digikey current transducer measures the battery discharge current, and a Digikey sensor measures the temperature of the battery. The smart phones are configured the smart phones to wake up for 4 seconds every minute and collect four data samples, one per second, from all the sensors. More information can be found at: https://iss4e.ca/webike-software/ and https://iss4e.ca/webike-a-three-year-study-on-e-bikes-as-a-mode-of-sustainable-transport-in-a-canadian-city/ To identify trip activities and battery charging sessions from the raw data in webike.json, you can follow the activity detection algorithm provided in Section 4.1 of Usage Patterns of Electric Bicycles: An Analysis of the WeBike Project, (https://www.hindawi.com/journals/jat/2017/3739505/), and the scripts we used can be found at: https://github.com/iss4e. time: Timestamp of the data collected acceleration_x: Acceleration in x axis acceleration_y: Acceleration in y axis acceleration_z: Acceleration in z axis ambient_temperature: Ambient Temperature atmospheric_pressure: Atmospheric Pressure battery_temperature: Temperature inside box (from a sensor in the telemetry box, in Celsius) charging_current: Charging current (using Phidget sensor, is reported as a float value. To convert reported value to Amperes use: Charging Current (in A) = Sensor Value * 0.05. Therefore, a sensor value of 400 implies a charging current of 2 A) code_version: Version of our software stack source code discharge_current: Discharging current (using ISS4E built sensor): Discharge Current (A) = (Sensor Value-504)*0.033 (the value 504 is the value displayed by the sensor for 0 Amps; it can vary slightly, +/- few units, so adjust accordingly) gravitational_acceleration: Gravitational acceleration gyroscope_x: Angular speed in x axis gyroscope_y: Angular speed in y axis gyroscope_z: Angular speed in z axis light_level: Light level in lux linear_acceleration_x: Linear acceleration in x axis linear_acceleration_y: Linear acceleration in y axis linear_acceleration_z: Linear acceleration in z axis magnetic_field_x: Magnetic field in x axis magnetic_field_y: Magnetic field in y axis magnetic_field_z: Magnetic field in z axis phone_battery_state: The state the battery of the phone is in proximity_sensor: Proximity Sensor voltage: Battery voltage (using phidget sensor, in V): The actual voltage is 32/22 times the value read by the sensor phone_battery_percentage: Percentage of battery left phone_charging_or_full: Is phone charging or full phone_is_AC_charge: Does phone charge with AC adapter phone_is_USB_charge: Does phone charge with USB rotation_scalar: Rotation scalar rotation_x: Rotation in x axis rotation_y: Rotation in y axis rotation_z: Rotation in z axis Funding: Cisco Systems and the Natural Science and Engineering Research Council of Canada (NSERC).数据所有者：C. Gorenflo、I. Rios、L. Golab、S. Keshav 数据说明：本数据集包含滑铁卢大学WeBike实地试验采集的数据，涵盖2014年夏季至2017年春季的电动自行车（e-bike）骑行记录与电池充电会话数据。共有31名参与者各获配一辆电动自行车，车辆通过自研套件完成监测。三星Galaxy S-III智能手机通过Android标准API采集三轴角速度与加速度数据；Phidget电压传感器用于测量电池电压，Phidget电流传感器测量电池充电电流，Digikey电流传感器测量电池放电电流，Digikey温度传感器采集电池温度。智能手机配置为每分钟唤醒4秒，每秒采集1组数据，每分钟共采集4组全传感器数据。更多相关信息可访问：https://iss4e.ca/webike-software/ 与 https://iss4e.ca/webike-a-three-year-study-on-e-bikes-as-a-mode-of-sustainable-transport-in-a-canadian-city/。若需从webike.json原始数据中识别骑行活动与电池充电会话，可参照《Electric Bicycles: An Analysis of the WeBike Project》第4.1节中提供的活动检测算法（链接：https://www.hindawi.com/journals/jat/2017/3739505/），所用脚本可从https://github.com/iss4e 获取。 各字段说明如下： - time：数据采集时间戳 - acceleration_x：X轴加速度 - acceleration_y：Y轴加速度 - acceleration_z：Z轴加速度 - ambient_temperature：环境温度 - atmospheric_pressure：大气压力 - battery_temperature：电池舱温度（遥测盒内传感器采集，单位为摄氏度） - charging_current：充电电流（采用Phidget传感器，输出为浮点值。转换为安培的公式为：充电电流(A) = 传感器读数 × 0.05。例如传感器读数400对应充电电流2A） - code_version：软件栈源代码版本 - discharge_current：放电电流（采用ISS4E自研传感器：放电电流(A) = (传感器读数 - 504) × 0.033，其中504为传感器0安培时的显示值，可能存在±数个单位的小幅波动，需据此调整） - gravitational_acceleration：重力加速度 - gyroscope_x：X轴角速度 - gyroscope_y：Y轴角速度 - gyroscope_z：Z轴角速度 - light_level：光照强度（单位：勒克斯） - linear_acceleration_x：X轴线性加速度 - linear_acceleration_y：Y轴线性加速度 - linear_acceleration_z：Z轴线性加速度 - magnetic_field_x：X轴磁场强度 - magnetic_field_y：Y轴磁场强度 - magnetic_field_z：Z轴磁场强度 - phone_battery_state：手机电池状态 - proximity_sensor：接近传感器 - voltage：电池电压（采用Phidget传感器，实际电压为传感器读数的32/22倍，单位：V） - phone_battery_percentage：手机剩余电池百分比 - phone_charging_or_full：手机是否处于充电或充满状态 - phone_is_AC_charge：手机是否通过AC适配器充电 - phone_is_USB_charge：手机是否通过USB接口充电 - rotation_scalar：旋转标量 - rotation_x：X轴旋转量 - rotation_y：Y轴旋转量 - rotation_z：Z轴旋转量 资助信息：本项目由思科系统（Cisco Systems）与加拿大自然科学与工程研究理事会（NSERC）资助。