But I did not have the USB interface...
Tracking showed it delivered to my building's apartment parcel locker on Saturday, but the postman mistakenly placed the key to said locker in the wrong mailbox. I had to wait until yesterday to catch him delivering the mail, and when we checked, my package was not there, taken by the person who erroneously received the key. I was disappointed, as I could not recoup my loss (the package was uninsured), and the postman apologized profusely for his mistake. Returning to my apartment, I resigned myself to having to order another when I could scrape up the funds; answering the question of the peak altitude of the Payloader One would have to be postponed until a later date.
But today, after work, my faith in humanity was restored when a neighbor delivered the package to me as I was walking in the door. She and I were coming home from work at the same time, and she noticed my apartment number. Telling me to wait, she fetched the USB adapter, still in the unopened box. I was most happy, and thanked her profusely. Honest folk still exist!
|Micropeak USB adapter. The altimeter is placed upside down, with the LED on|
top of the sensor in the middle of the adapter.
|Payload One flight profile (Click to enlarge).|
- The altimeter flopping around the payload section introduced strong oscillations in the data, especially in the speed and acceleration profiles (Big surprise, eh?), and
- It was not given adequate time to sense ground level pressure, as it has the rocket landing at -54 feet. Ground level is supposed to be at 0.
This is why I like recording altimeters - I would have never known that the Micropeak had not sensed ground level and adjusted its zero without looking at the data. Well worth the additional money (The Firefly costs $25; the Micropeak $50).
The software also displays a nice summary of the flight, and presents the raw data in tabular format so it can be copied into other applications, like Excel. You can also export the data as a csv file for import into almost anything. It's a pretty nice piece of code and runs under Mac OS X, Windows, and Linux.
|Payloader One flight summary as reported by the software (Click to enlarge).|
|Raw data display (Click to enlarge).|