Volume of lying cylinder

[Micha_he]

Is it possible to calculate the volume 'V'(from the measured height 'h') of a lying cylinder with ESPEasy ?
Has ESPEasy mathematical functions like ARCCOS ?

Formula: V = r²*l*(arccos(r-h/r) - (r-h)*√(2*r*h - h²)/r²)

[grovkillen]

No not currently, could you please add it as a feature request on GitHub?

[Micha_he]

Sure...

[HomeJCL]

Why not curve fitting in the meantime.

Google for a percentage fill table > curve fit choose adhoc curve fit et voilà accurate enough for at home.

[rira2005]

HI need this too? any news about this request?
many Thanks.
Raphi

[Micha_he]

Here's my solution (polynomial function 5. grade instead the ARCCOS-formula):

Device1: JSN-SR04T, Name: Fuellstand, Valuename: WertRelativ, Formula: ([min-cm ]-%value%)/([min-cm]-[max-cm])*100
Device2: Dummy-Device, Name: FuellstandZylinder, ValueName: FuellstandZylinderRelativ

Rule to calcute 0-100% height to 0-100% volume:

Code: Select all

On Fuellstand#WertRelativ do
	Taskvalueset 2,1,-0.1428+0.290825*%eventvalue%+0.0285366*%eventvalue%^2-0.000428633*%eventvalue%^3+0.00000356523*%eventvalue%^4-0.00000001419964*%eventvalue%^5
endon

The value from the second device is published via MQTT to my OpenHAB-Server.