Data from IMU: imu.csv
  Started 11:37 am, 2/8/2020
  Temporal frequency is once per second.
  The Inertial Measurement Unit used to collect
    these data is a GY-88 board connected to
    an Arduino UNO.  Temperature, atmospheric
    pressure, 3-axis accelerometer and 3-axis
    gyroscopic data are collected (the 3-axis
    magnetometer data are not collected).  More
    info is available here:
    https://www.hotmcu.com/imu-10dof-mpu6050hmc5883lbmp085-p-188.html
  The firmware running on the Uno is available at:
    http://nordlie.cs.und.edu/cs270/data/datalogging/gy-88b_arduino.zip

Data from Geiger counter: geiger.csv
  Started: 11:40 am, 2/8/2020
  Temporal frequency is once per second.
  The Geiger counter unit is an Aware Electronics RM-60
  The counts-per-minute from the counters Type 712
    Geiger-Muller tube are equivalent to the 
    radiation reading in microRoentgens per hour.
    To calculate from this dataset, sum 60 
    consecutive numbers in the file to obtain
    a counts-per-minute reading.  More info at:
    https://www.aw-el.com/60manual.pdf

Data from Air Quality sensors: airquality.cvs
  Date/time included in data stream.
  Temporal frequency is once per minute.
  The data are collected via an Arduino Uno
    and saved to an SD card with real-time 
    stamp via an Adafruit data logging 
    shield: 
    https://www.adafruit.com/product/1141
  The sensors include a DHT11 temperature and 
    humidity sensor:
    https://learn.adafruit.com/dht
    A MiCS 5524 Co, Alcohol, and VOC gas sensor:
    https://www.adafruit.com/product/3199
    And an MQ-135 gas sensor:
    https://www.olimex.com/Products/Components/Sensors/Gas/SNS-MQ135/resources/SNS-MQ135.pdf
  Data are stored on an SD card and also transmitted
    in real-time via an HC-06 Bluetooth module:
    https://components101.com/wireless/hc-06-bluetooth-module-pinout-datasheet
  Firmware running on the Uno is available here:
    http://nordlie.cs.und.edu/cs270/data/datalogging/logger_nordlie.ino

Data from magnetometer : mag.csv
  Date/time included in data stream.
  Temporal frequency is once per second.
  Format: first field is date: DDMMYY, where DD is the day of the month, MM is the
    month number, and YY is the last two digits of the year.  Next field is UTC time:
    HHMMSS, HH is hours, MM minutes, and SS seconds UTC.  Final three fields are the
    magnitude of the x, y, and z axis magnetic fields, in units of microTeslas times 10.
  Sensor is a Freescale MAG3110, in the form of a SparkFun breakout board:
    https://www.sparkfun.com/products/retired/12670
  Hookup guide with demo software here:
    https://learn.sparkfun.com/tutorials/mag3110-magnetometer-hookup-guide-/all