At the beginning of our second lab, one thing popped out and immediately caught our attention----it seems that a USB wire for the connection of the pixhawk to the computer was lost! This was not an fatal loss, however, it did lag our progress by trying to find a new suitable wire. This has taught us a lesson on keeping gadgets categorized and sorted out before leaving the lab.
The lab agenda this week is to set up the pixhawk on the UAV and fully calibrate the copter. Waiting for a new battery charger and a 14.7V Lipo battery to arrive, we had to connect the transmitter to the power supply to make it function during the radio calibration period. Without the proper battery, however, we managed to complete the accelerator calibration, radio calibration, compass calibration and flight mode initialization process. The pixhawk, then was checked again by moving around to judge if the calibration worked (the measured results can be seen on the mission planner).
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| The pixhawk-mounted UAV |
Therefore we searched for solutions to address the problem. Several factors might cause this problem. We listed them out and tested them one by one. Finally we found that it was because the GPS signal inside the lab was too low and if we wanted to catch the signal we had to move the UAV outside the building. At that instant it would be late to ask for permission to move out the UAV. Therefore, we decided to write to our tutor Simon and have a discussion of it.
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| Caught the very weak GPS signal(shown on mission planner) |
Next week we plan to calibrate the ESCs and arm the UAV so that it might be able to function.
This project is becoming more and more amusing and challenging for everyone. Patience, diligence and implacable purpose may be our weeks to come.
Looking forward!
Ally & the team
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