Some Test Data

For the last couple of weeks I have been doing some fine tuning and some testing. First of all, I have been testing the data logger and and now have some calibration data for the barometer and the accelerometer. I have also found out that the thermistor we currently have outputs a negative voltage for negative numbers and a positive voltage for positive numbers. The arduino does not recognize negative voltages. We could have run the thermistor through an opamp to shift the voltage, but since I'm running out of room on my board, it is just easier to order a different one that does only positive voltage. Once this comes in, I will put some test data of the temperature up. I have also done some testing of the balloon exploder circuit. We plan to have a few smaller balloons for the first test flight. It will be easier to cut the line than to have a number of balloon exploders, so I needed to test to see if the solar ignitors will burn through the nylon line. I did a test with simply a solar ignitor connected to 18v and another test with the whole exploder circuit and both tests were successful.

The barometer calibration data is at the following link:
https://docs.google.com/spreadsheet/ccc?key=0AqH-Vyu_xTSKdGFBam9sbFFIbEJUMDRRRER1RG8tcnc
And some test data is at the following link:
https://docs.google.com/spreadsheet/ccc?key=0AqH-Vyu_xTSKdDN1S0EyOVJXRlZWdThxamR1NWpxUEE