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TIPS and TRICKS

How to fix Jello in the Diatone 2019 GT R239, R249, R249+ and R349 plus final PIDs

7/8/2019

2 Comments

 
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The Diatone GT R249+ is my favourite traditional 2.5 inch micro quad based on it's relatively lightweight in this class, motors which have a wonderful mix of power and efficiency, reliable electronics and excellent built quality. My review of this quad is here and it is still available across multiple retailers.
However over a short period of time I started getting a lot of Jello which is concerning given the camera is a CCD which should be much more stable. I did a lot of PID and filter tuning but gave up after a while and let it sit on my shelf. Now I've come back to it with a fresh set of ideas and believe I have fixed the Jello problem once and for all. Firstly I can categorically state that in my case it was not the tune nor the propellers that fixed the issue as I've seen stated elsewhere. The issue is around the camera/VTX and this fix should be relevant to all canopy versions of this quad that doesn't use the TBS vtx i.e.​
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GT R239 (2 inch plastic frame)
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​GT R249 (2 inch carbon frame)
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GT R249+ (2.5" carbon frame)
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GT R349 (3 inch carbon frame)
What is the problem?
The problem is the way that the runcam TX200u vtx attaches to the camera. Although this is actually a very good clean vtx that is light and great for saving spaces it requires the manufactur to remove the screws that hold the camera lens housing to the sensor board and re-use these mount point to use longer collared screws that perform the same function as well as holding the vtx to the camera. What I think it happening is that this is compromising the solidity of the mount between the sensor and the lens housing thereby introducing vibration between these two units.
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​Runcam tx200u  vtx
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The screws that hold the vtx to the cam also hold the sensor board to the lens housing and I believe the connection between the board and housing is compromised as a result. At least the Caddx Turbo F2 has some foam tape between board and housing unlike the stock runcam swift although I don't believe a camera change is necessary.

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MOBULA7 UPGRADE: Betaflight 4, PIDS and Filters

17/6/2019

16 Comments

 
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The Happymodel Mobula7 uses a F3 based flight controller and since Betaflight 3.4, these boards have not had full functionality of F4 and F7 boards due to smaller memory size for firmware storage. However in this article I will cover how to upgrade to the performance edition of Betaflight 4.04 kindly compiled by UAVTech (his in depth YouTube Channel is here). This special version adds the key performance functions at the cost of typically irrelevant features like servo control, acro trainer, camera control etc. In this article I will show you where to access this firmware and then I'll show you the filters that suit brushless whoops best as well as some good starting PIDs. 
This is the seventh and likely final article in my series of HappyModel Mobula7 upgrades, many of which can be used for the Trashcan too. Also to come are:
  • Swapping to a much more durable frame​
  • Improving the battery connector for more power
  • converting to run 'props out' 
  • Long term propeller upgrade recommendations​
  • Converting your 1s batteries into a true 2s battery
  • receiver range improvement​
All links will be updated here when completed. Many of these I've completed the work and am testing at present - it's starting to feel like a more complete little quad now. If you're looking for my review of the mobula7 including setup it can be found here
Betaflight 4 Performance edition for F3 boards
This is the final version of Betaflight you can use and I strongly recommend you use this version rather than the one on the Betaflight configurator to get full performance functionality otherwise you will miss out on features like:
  • Gyro Lowpass2
  • Launch Control (optional - OFF by default)
  • Dynamic Lowpass Filters (Dyn_LPF) (ON by default)
  • D-term Minimum (D_min) (ON by default)
  • Throttle Boost (ON by default)
  • iTerm Relax (ON by default)
  • RC Smoothing - Filter (ON by default)
  • TPA Mode - D-term ONLY option (ON by default)
Download the custom file below at the GITHUB source. SKIP THIS STEP FOR THE EACHINE TRASHCAN
For FRSKY built-in receiver
betaflight_4.0.4_crazybeef3fr_performance.hex
File Size: 679 kb
File Type: hex
Download File

For Flysky built-in receiver
betaflight_4.0.4_crazybeef3fs_performance.hex
File Size: 646 kb
File Type: hex
Download File


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