Calculate the filled volume of a horizontal cylinder tank

[littlebilly]

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Have you looked for this feature in other issues and in the wiki? yes Describe the solution you'd like Is it possible to "Calculate the filled volume of a horizontal cylinder tank" with the script editor for Tasmota?

I get the the water-level of my lying cistern via the analog value of a Wemos D1 flashed with Tasmota. It would be nice to calculate the Volume (Liter) via Tasmota Scripting Language and show the result on a ssd1306 Display.

[gemu2015]

since the formula is very easy (V = π · r2 · h) it is no problem to calculate the volume right away you may precalculate pi *r2

D v=0 h=0 pir2=7.23456 (e.g.)

T ; enter your sensors MQTT designators here h=Yoursensor#level

S

v=pir2*h

print Volume=%v% liters

[littlebilly]

Thanks a lot for your quick reply. As I mentioned I have to Calculate the filled volume of a horizontal cylinder tank like in this link. https://www.calculatorsoup.com/calculators/construction/tank.php Your formula is for "Vertical Cylinder Tank" The question is whether "Horizontal Cylinder Tank" could be calculate with your scripting language.

[littlebilly]

Sorry closing was a mistake

[gemu2015]

Ok, horizontal cylinder is currently not supported because It needs arccos and sin will think about implementing

[gemu2015]

define USE_ANGLE_FUNC

enables sin and acos

given r,l and h this should calculate the volume

a=2*acos((r-h)/r) v=l ((rr)/2)*(a-sin(a))

did not test it yet you may give it a try

[littlebilly]

You are the greatest! Thanks a lot I will test it as soon as possible. But this will take some time, because I startet using your Scripting Language today.

Question? May I use your fork universal7 equal to version 6.71

[gemu2015]

yes sure, if this is verified i will make a pull request to Tasmota dev branch.

[littlebilly]

Do I have to activate

define USE_ANGLE_FUNC

via console or in my_user_config.h?

For testing I tried this without any sucess.

`>D r=100 l=207 h=0 a=0

T h=ANALOG#A0/3 S

a=2acos((r-h)/r) v=l ((rr)/2)(a-sin(a))

=>print Flaeche A:%a% qcm! =>print Volumen :%v% qcm! endif`

[littlebilly]

A little step forward. a=2acos((r-h)/r) has to be a=2 acos((r-h)/r) otherwise i get the message --> var not found: *acos((r-h)/r)

Result Hoehe: 176.00 cm Flaeche A:2.00 cmcm Volumen :207.00 cmcm*cM I think there is still something wrong.

[littlebilly]

Would it be possible to use this formula

[gemu2015]

hier hab ich die Formel her (Bartsch) Beh-ltervolumen.pdf

define USE_ANGLE_FUNC muss in my_user config.

in Formeln darf kein Leerzeichen zwischen Mathezeichen sein weil nach dem Leerzeichen abgebrochen wird.

der Fehler kommt weil acos nicht kompiliert wurde

[littlebilly]

ok. ich hatte #define USE_ANGLE_FUNC in der user_config_override.h Werde das ganze nochmals sauber bauen. Danke nochmals!

[gemu2015]

ok, hab jetzt selbst noch mal getestet da war noch ein Fehler bei den beiden Funktionen, ist jetzt behoben. Jetzt mal die Formel auf plausible Ergebnisse testen

[gemu2015]

hab jetzt noch sqrt (wurzel) eingebaut damit man auch die andere Formel testen kann

[littlebilly]

Super danke werd ich tun! Und melde mich auf jeden Fall. Falls es dich interessiert hier mein Beitrag zur Zisternenlösung! https://forum.fhem.de/index.php/topic,93308.0.html

[gemu2015]

mit diesen Werten kommt das richtige Ergebnis raus muss man jetzt mal mir verschiedenen anderen Werten testen

>D r=100 l=200 h=100 a=0 v=0

>T ;h=ANALOG#A0/3

>S

a=2*acos((r-h)/r) v=l((r*r)/2)\(a-sin(a))

print Winkel Alpha:%a% print Volumen :%v% qcm!

[littlebilly]

Sorry habe gerade große Probleme beim flashen! Ergebnis mit obigem script bei mir! 16:06:06 Winkel Alpha:2.00 16:06:06 Volumen :0.00 qcm! Volumen null kann eigentlich nicht sein. Mache jetzt mal eine längere Pause.

[gemu2015]

sorry, wenn man ein script hier postet gehen Zeichen verloren. oben sind die * Zeichen verschwunden. habe das editiert

[littlebilly]

Super, danke die Volumenberechnung geht jetzt.

v=l/1000((rr)/2)(a-sin(a)) --> result in liter sorry die Zeichen sind weg!

19:08:49 Volumen :5770.02 Liter

Wieso a0 nicht mehr angezeigt wird und wieso Display jetzt verschwnden ist macht mir noch Probleme.

19:12:03 CMD: Display 19:12:03 MQT: stat/GGzisterne/RESULT = {"Command":"Unknown"}

[littlebilly]

Works perfectely now! I copied your "xdrv_10_scripter.ino" to Tasmota 6.71 master, activated #define USE_ANGLE_FUNC in my_user_config.h!!! After compilation I got what I need. I learned a lot regarding your phantastic scripting language for Tasmota. Many thanks for your help.

By the way, is it possible to suppress the two positions behind the decimal point?

[gemu2015]

setting the precision of a replacement variable

either globally for all following vars with dpx (x 0..9) or individually by a preceding digit

e.g. displaytext volume: %0v% liter

[littlebilly]

Is there a bug in your calculates exponential powers functionality? pow(x y) = calculates exponential powers x^y

19:59:46 CMD: script >print%sqrt(4)% --> the result is 4 and is ok! 19:59:46 2.00

20:00:14 CMD: script >print%pow(2 2)% --> the result is 3.88 instead 4 ???? 20:00:14 3.88

[gemu2015]

i simply call pow from the tasmota math utility it was changed in the corse of time to a smaller and faster form. will check if it is that imprecise.

[gemu2015]

i checked it now. it is indeed that imprecise Arends replaced all pow() functions in Tasmota with FastPrecisePow which tends to be NOT precise at all.

[gemu2015]

what is the impact on the above formula ? if it is too hight you may file a bug report to tasmota.

[littlebilly]

Hi Gemu, there is no impact at all to the above formula. I just used pow function in another context and noticed that it does not work correctly and thought it is scripting related. Thanks a lot for your quick response and again for your Tasmota scripting version.