Chameleon Build

By ShutterPriority on Apr 02, 2017

1 482  7 

Combo racing/freestyle build, plenty of power, but not obsessing over Thrust:Weight ratios

Soft-Mounting of PDB/FC via Armattan 3m 9448A PDB Pads and O-rings
OSD via F4 Omnibus running BetaFlight
VTX control over SmartAudio via SoftSerial resource-mapped to PWM5
Pagoda Antenna from FarVew

DSHOT 300 at 8K/8K PID/Gyro rates - Smooth!

AUW - 541 Grams: Approx 9:1 Thrust-Weight Ratio

What I loved most about this build:

  • Armattan Frame fit/finish and PDB soft-mount.
  • Blackbox SD cards on FC
  • The way it flies afterwards...

What I loved least about this build:

  • Armattan PDB to Omnibus F4 ammeter/shut resistor wiring. I wanted to keep the Armattan "Connector Saver" rubber XT60 mount to the Soft-Mounted PDB, but also wanted amps used/drawn on the F4 Airbot Omnibus OSD. It looks a little hacked, but still does the job. (see photos)
  • Diatone SW402 Didn't like to be waterproofed. 3 LEDs died after conformal coating(!??) [MG Chemicals Acrylic #419C]
  • Documentation for Airbot Omnibus F4 Pro V3 is limited. Thank you RC Groups!
  • No solder-points for UART access on Omnibus F4 Pro V3, only JST headers.
  • PDB soft-mount + O-rings increases height of stack so that J10 JST header (for UARTs) on Omnibus F4 Pro is not usable - access blocked by aluminum camera mount rails

Note: Omnibus F4 Pro has issue with SD Card logging for BB logs: you must 'set sdcard_dma=OFF' in order to use BB logging to SD or your quad will freak-out at some point in flight. This is not a BF issue, it appears to be an issue with the STM F4 DMA handling of concurrent R/W requests.

Photos

Discussion

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Joshearl   22 days ago  

How did you accomplish having both current sensing and OSD along with the rubber connector saver?

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Joshearl   20 days ago 

That's a creative way to get the benefits of both, nicely done. I've got a couple questions: Is that thick of wire gauge necessary? Are you having any issues with removing connections with only one side of the connection saver soldered down? What about running the positive connection through the PDB hole?

ShutterPriority   16 days ago 

I've gone back and forth on the wire gauge.... I'm bursting to 75Amps total draw when I run Racekraft 5051's so I'm not sure I'd want to go much smaller in terms of wire.

I did have the 14AWG ground wire pull out (break, due to use) the other day, so I replaced it with a 12AWG down to the PDB to hold it in better, and tried to keep my tinning to just the very tip.

No, the positive feeds need to be separated, they can't both run through the PDB hole, one needs to feed the shunt resistor, the other is the return that goes to the PDB, and those do need to be adequately beefy to pass the current.

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