I've been in the basement getting the flight control ready to mount to the frame. In the pics you can see the foam heat-shrinked to the pressure sensor and you might not see it but there's a glob of hot glue under the sensor so it can't vibrate and break the prongs. This happened to my first MK board, caused a crash, and now they're saying to do it as standard practice over at MK.us since the XL MK's are seeing more and more of it happening also. I tried to find the least dense foam I could so it wouldn't impair the sensor's ability to pick up on very small changes in pressure which should result in better altitude hold performance. If ambient air pressure can't be sensed at the tiny hole in the center of the sensor then the FC can't control altitude as well. Leave the hole completely uncovered though and any airflow inside the dome could confuse the sensor.
I've got wires for the Spektrum diversity board which will allow me to use multiple receiver satellites and two leads from the top SV2 position for my LED's (red for the front, white in the back). The last spool of wire with nothing on the end will go to a low voltage beeper which I won't be able to hear but at least when I get to the crash site, if it's still beeping, I'll know what happened.
View attachment 543
QUESTION oh MK gurus......
Since I'm not using an MK power board, I assume I need to bring power to the flight control board somehow. Do I just bring full battery (4S LiPO) power to the big pads at 14 and 16? 16AWG wire ought to do, no? I'd bet my little stash of 20AWG servo wire would do just as well actually since it's only powering the brains and LED's (and the not-so-loud beeper).
14 - Ground (GND) connection for the Flight Controller
15 - Positive (+) connection for the Flight Controller (if a power switch is being used)
16 - Positive (+) connection for the Flight Controller (without a power switch)
In looking at how the Molex connector replaces battery connection directly to the FC board, it's amazing to me that the tiny wire in the molex connector brings power for the FC and the two RECOM which power the servos. That seems like a lot of current for such a tiny wire.
Back to work building my power harness while I wait to see what needs to be done with the FC battery connections.
Thanks,
Bart