The Avengers
Measure ozone concentration as it relates to temperature from ground level to approximately 100,000 ft. above sea level. Using this data, calculate the UV ray concentration in the atmosphere
Sensor Sensor Interfacing Control Power Supply Power Budget
Acts as a variable resistor. Resistance around 1.2K Ω Resistance increases with increasing exposure to oxidizing gases, namely ozone and NO 2 Resistance increases linearly from ppm ozone at approximately 105 Ω per 1 ppm. Resistance increases linearly from 2.4 to 10.5 ppm ozone at approximately 12 Ω per 1 ppm.
The thermistor works as a variable resistor. Has a negative temperature coefficient, meaning resistance decreases as temperature increases.
Seven 1.5V AA Energizer ultimate lithium in series to make one SUPER battery(10.5 V). 3000 mAh capacity. Must supply 150 mA for 4 hours. Needs 600 mAh capacity to accomplish.
BalloonSAT draws 53 mA of current. Each ITO sensor expected to draw less than 10 mA. There are 8 sensors in total. Thermistor current is negligible as its impedance is on the order of 100k Ω. The power supply must supply 9V, otherwise the BalloonSAT will not operate. 150 mA is planned for. At four hours of operation, 600mAh will be required. The power supply voltage will derate to about 90% of its voltage after 4 hours of 200mAh discharge at -20º.
Three Basic Loops First loop checks all sensors and awaits “go” command. Second loop cycles readings from multiple sensors. Final loop retains memory, stops readings, and continues to supply power to the circuit.
Hollow regular hexagonal prism (Internal side: 76mm) External: FOAMULAR Insulating Sheathing (Density =.029 g/ cm 3 ) Internal: Rectangular foam bisecting the payload Weight Budget: Components taken into consideration: 320.4g Components not taken into consideration: 50g The payload wrapped in a reflective thermal substance
Project Management Risk Management
Development Integration Pre-CDR Mar 4 CDR Mar 30 Flight May 25