Triflight setup guide

[LeoTheHuman]

I’ve spent some time on fixing and re-configuring my mini today and decided to write a short guide on triflight setup.

I expect to update the document with every major change to the setup procedures. I can’t promise it will be updated instantly, but it should be easier to update now, when it exists.

If after following these instructions you have any questions related to the setup of your mini tricopter, feel free to ask here. If you believe some clarifications should be made to the tricopter specific steps, comment below. If you can’t follow a general instruction (not specific to the tricopter), try again! I’ve tested every step and google helps a lot if you’re new to it. (:

[rue]

Thanks Leo, looks great! I think a little table with the tri-flight specific CLI commands would be great for the ones who are exhausted by keeping track of Betaflight 😉

[Terje]

Great write up @LeoTheHuman. This should make it much less intimidating to setup the mini with TriFlight thus providing even more constructive feedback from the community 🙂

How did you measure the speed of the servo, and how did you verify that they were correct? I would like to do some measurements on different servos/setups my self, but want to use the same method to assure that others can use them also 🙂

[lauka]

I measured it with Mobius at 60 fps. Give yaw stick input from side to side and calculate the speed based on the angle that servo travels. Get few measurements and take average.

[lauka]

Btw if someone has iPhone or other recording device capable of 240 fps would be nice to get more accurate measurements.

[csreades]

Fairly sure my Yi can record 240fps, will try later today.

[csreades]

I have a video for the 240fps, it is the standard electronics at 5 volts.

[LeoTheHuman]

Upload it somewhere, which doesn’t recompress files, like any storage service, not YouTube, please. Exact voltage would also help.

[lauka]

And please try to measure the exact angles the servo is traveling on the video. This way we get as accurate speed measurement as possible.

[csreades]

Sorry for the late reply, so this is the file uploaded on dropbox.

The lighting was bad (wish I could use HS camera at work) but hopefully it should help.

[video src="https://dl.dropboxusercontent.com/u/21987140/YDXJ0029.mp4" /]

The voltage was the coming from the voltage regulator on a fully charged 4S, so should be 5V.

[Terje]

I’ve shot a video @240fps running the BMS-210DMH @ 5.06v attached to the standard tilt with the DYS-2208 attached. The speed comes 349 degrees/sec. That corresponds well to the specs: 0.15sec / degree @ 4.8v.

I’ve setup an Arduino Nano with a small test program to be able to replicate the tests.

@lauka in order to reproduce the tests to achieve your 225 degrees/sec under load, I need to know what load we are talking about?

What does your test setup look like?

[lauka]

I tested the on load speed with motor with prop on running at 1600 throttle. There was no difference to no load speed.

How did you calculate the speed? I used following formula: speed = servo travel in degrees * fps / recorded frames.

e.g. with 60 fps Mobius, servo travels 80 degrees, takes 17 frames: 80 deg * 60 fps / 17 f = 282 deg/s.

[Terje]

I counted the number of frames it took to travel 80 degrees. Average 55 frames. Then calculated (80/55)*240 = 349 degrees / sec?

Your way produces the same result.

[Terje]

The results for 6v are 400 degrees/sec. (48 frames to travel 80 degrees at 240fps)

[Terje]

These are the numbers for the BMS-22HV servo

6v = 840 degrees/sec
7.4v = 960 degrees/sec
8v = 1010 degrees/sec
8.4v = 1067 degrees/sec

– Yes that servo almost tore my test stand apart…

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