Flight conditions testing of complete system

Lead author: Hanayo Shelton

Goals: 

The goal of the flight conditions testing of complete system is to ensure that our system for this high altitude balloon project can work fine under actual flight conditions since air temearture decreases with altittude, dropping down to below -20̊C at near 30km above the ground.

 Testing:

We placed the circuit board consisting of an Arduino and all the sensors into a cooler box in which dry ice to cool the inside of the box had been put in advance. The measurements  were performed for 24hours and the data were taken every 100 ms. During the measurents, the readngs of all the sensors were sento to a SD-card and stored in it. The entire data was too long to put here, so we show the readings of each sensor for the first 1 second. When we strated the testing, temperature was 22  ̊C, and humidty was 42 %. Dcreasing over time, temperature dropped down to -8  ̊C  in about 100 minutes, and humidity also dropped down to 30 % while both pressure and acceleration were stable over the measurment.

        

Temp (̊C )

RH (%)

Pressure(Pa)

Accel X

Accel Y

Accel Z

Time Since Start (ms)

21.78	41.74	99312	-0.74	-0.27	-1.76	475
20.8	41.84	99313	-0.75	-0.27	-1.79	575
20.8	41.64	99313	-0.78	-0.32	-2.27	675
20.8	41.74	99316	-0.73	-0.25	-1.72	775
20.8	41.84	99321	-0.75	-0.27	-1.75	875
20.8	41.54	99321	-0.75	-0.27	-1.76	975
20.8	41.84	99318	-0.74	-0.27	-1.75	1075
20.8	41.84	99324	-0.74	-0.25	-1.72	1175
20.8	41.64	99322	-0.73	-0.23	-1.73	1275
20.8	41.84	99318	-0.74	-0.27	-1.75	1375
21.29	41.74	99321	-0.75	-0.25	-1.45	1475

Recommenation: Since the calibrations for temperature sensor and accelormeter have not been done  yet, in order to get appropriate data, we need to complete it before lunch.