calculatiing Headspeed on taranis

[jtroutt19]

Hey guys so I was trying to find a LUA script that would calculate headspeed based on RPM sensor data from motor. The only one I found does not work and doesnt display correctly. So I am trying to figure out how to do this. I don't know enough programming to fix the script. Is there a way to do this without an LUA script?

If not any good primers on LUA scripting that gives you the basics and such?

[Kilrah]

2.1 telemetry does that natively with the multiplier/divider.

[rcdiy]

This is new to me:)
How does RPM relate to the speed without knowing the characteristics of the model?

[Kilrah]

Headspeed IS RPM... Just need to apply your gear ratio if you measure motor RPM.

[jtroutt19]

I was looking for it cause I thought that it was capable of doing it but couldnt find it. Can you give me a small walkthrough or direct me to a page that describe how to get it set up? thanks!

[Kilrah]

Once you've discovered sensors you select the RPM sensor, enter to edit settings, and enter multiplier and divider.

[jtroutt19]

OK I am running 2.1.9

this is what I have when I edit the sensor

NAME - RPM
TYPE - Custom
ID - 0500 5
UNIT - rpm
PRECISION - 0.--
BLADES - 1
MULTIPLIER - 1

and there are some check boxes below that

I dont ever see divider not even if I change the TYPE. What am I missing here

[Kilrah]

"Blades" acts as divider.

[jtroutt19]

ahh ok then thank you

[jtroutt19]

OK so I have been trying to get this working it is making me feel stupid. My Gear ratio is 9.33 Obviously i cannot put in 9.33 under blades and if I just put in 9 the head speed is not correct. What in the world am I doing wrong.....

[jtaylor]

How about blades 933 Multiplier 100?

Jim

[Kilrah]

Exactly

[jtroutt19]

Awesome thank you. Can you explain how the calculation works. I am a bit confused on it? Is it basically dividing the RPM by 933 and then multiplying it by 100. That works out correct as far as max headspeed is concerned. I just want to make sure I am understanding it totally.

[Hankhop]

That's how I've been calculating it and I'm pretty sure it's correct.

[RCNet]

If it is single stage drive, I think you could also simply set the "multiplier" to the number of teeth on your motor pinion, and the "blades" to the number of teeth on your main gear to get the same results as multiplying then dividing the final ratio by 100.


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[rcdiy]

@kilrah
Has this changed in 2.2?
I see
Name
Type
ID
Unit
Precision
Blades
Auto Offset
Persist
Logs

[Kilrah]

No. Fields appear as intended once the right sensor type/unit has been set.