Data

The balloon's payload was equipped with a data logger recording temperature and humidity, and altitude at 10 second intervals. The data logger had two sensors: a HTU21D sensor that recorded temperature and humidity, and a BMP180 that recorded altitude and temperature. The microcontroller was an Adafruit feather adalogger powered with a 1200mAh lithium ion battery. At about 90,000 feet, the sensors froze, as you will see in the data, which is included below. (Note: the last number in the first row is the temperature in degrees Fahrenheit as recorded by the BMP180 sensor). Relative altitude is the altitude from where the data logger was turned on. The data logger was turned on at approximately 295 feet above sea level. At some point (over 60,000 feet) the temperature sensors seem to start reading incorrect temperatures. At this altitude, they might have frozen. At these altitudes, the altimeter still seems to have been working. In general it is fairly easy to spot the outliers.