DJI Naza Voltage Protection Levels
This is how I've set my first and second level protection voltage thresholds. I found the default setting with 14.8 Volts in the 'No Load' without any value in the 'Loss' field meant the Second Level Protection kicked in far too early and the Quad became sluggish to ascend. Even at full throttle, it would only rise very slowly. Flicking it into manual mode and the Quad would take off like a rocket. That tells me the battery has plenty of juice left in it but the Naza is artificially limiting the maximum throttle available by slowly moving the mid-point up.
The results from the Eagle Tree logger show a loaded voltage level throughout the entire flight. 14.4 and 14.2 is probably a bit conservative but I'll test it out and see how it goes. I reckon I might change it to 14.2 and 14.0. We'll see.
****Update - 5th July 2012
I think these values are too conservative. On the last flight, 2nd level kicked in and I still had about 50% left in the 2650mAh 4S. I've set them to 14.2 and 14.0 (zero loss) and will do another test flight. The Eagletree logger is fantastic for this type of problem.
E Sky LCD Voltage Indicator
Ok so I've got an idea of how much current the receiver battery monitor draws (about 10mA) but what about the voltage. What does a green light really mean. Can I rely on a simple green or red LED to base my decision on?
I hooked up an E Sky LCD Voltage Indicator in parallel with the Tower Pro monitor to define the actual voltage levels represented by each LED. Keep in mind the battery pack used is a four cell, 4.8V 1100mA Sanyo pack.
According to the Tower Pro thresholds then, a pack is in good condition only when the measured voltage is greater than the defined voltage (4.8V).
