Reply
 
Thread Tools Display Modes
 
Old 08-01-2016, 02:15 PM   #801
Bus Geek
 
Join Date: May 2009
Location: Columbus Ohio
Posts: 3,114
Year: 1991
Coachwork: Carpenter
Chassis: International S3800
Engine: DT360
Rated Cap: 7 Row Handicap
why not do this with a manometer method... all of your tanks have some sort of holes anyway... your black tank is going to be tough because of the solids... but you can learn by flushes with that tank... X number of flushes on average equals X level in the black tank...

fresh and gray... the way for years washing machines detected water level was with a vertical tube into the top of the tub prottruding down to nearly the bottom but not touching... this tube would fill up with air as the tub filled creating pressure.... when the pressure reached the set level a switch tripped.. your knob on the panel simply changed the spring pressure of this switch...

enter 2016... a simple static air pressure transducer like I use for my HVAC systems would work just snazzy at the top of that tube i have a feeling... .. mine produce a 0-5 volt analog signale.. I know my zbasic.net chips have built in A2D ..the arduino might too? or a couple of them if you wish to see the slosh or average out for unlevel parking.... washing machines had crappy hard water, soap, fabric softener etc in the tub and never clogged the tube or ruined the sensors...

-Christopher
cadillackid is offline   Reply With Quote
Old 08-01-2016, 07:16 PM   #802
Site Team
 
Join Date: Jul 2014
Posts: 648
Year: 1998
Coachwork: Bluebird
Chassis: TC2000 RE
Engine: 8.3l Cummins
Rated Cap: 78
Problem is the tank is vented to atmosphere, and a manometer with a huge hydraulic column would be really sensitive to atmospheric pressure changes. Good for a go/nogo situation like a washing machine but hard to get accurate measurement readings from a static pressure transducer.

I thought about load cells to, but honestly it keeps looking like either conductive pins (like every other RV ever) or an array of capactitive sensors seems easiest to me.

I thought maybe a sight tube with a floaty magnetic ball would be neat, maybe some hall sensors to the outside. Once again, possible solids might be an issue.

Ultrasonic transducers are neat, but really expensive.

Take a look at:

A Dozen Ways to Measure Fluid Level and How They Work | Sensors

Gives you an idea what might work.

Quote:
Originally Posted by cadillackid View Post
why not do this with a manometer method... all of your tanks have some sort of holes anyway... your black tank is going to be tough because of the solids... but you can learn by flushes with that tank... X number of flushes on average equals X level in the black tank...

fresh and gray... the way for years washing machines detected water level was with a vertical tube into the top of the tub prottruding down to nearly the bottom but not touching... this tube would fill up with air as the tub filled creating pressure.... when the pressure reached the set level a switch tripped.. your knob on the panel simply changed the spring pressure of this switch...

enter 2016... a simple static air pressure transducer like I use for my HVAC systems would work just snazzy at the top of that tube i have a feeling... .. mine produce a 0-5 volt analog signale.. I know my zbasic.net chips have built in A2D ..the arduino might too? or a couple of them if you wish to see the slosh or average out for unlevel parking.... washing machines had crappy hard water, soap, fabric softener etc in the tub and never clogged the tube or ruined the sensors...

-Christopher
aaronsb is offline   Reply With Quote
Old 08-01-2016, 07:53 PM   #803
Bus Nut
 
Join Date: Feb 2012
Location: Salt Lake City Utah
Posts: 958
Year: 2000
Chassis: Blue Bird
Engine: ISC 8.3
That article at sensorsmag was an interesting read. Is it ok if I start calling the tanks "process fluid storage vessels" instead?
family wagon is offline   Reply With Quote
Old 08-01-2016, 09:19 PM   #804
Bus Crazy
 
Stu & Filo. T's Avatar
 
Join Date: Sep 2013
Location: Vacaville, Ca
Posts: 1,136
Year: 1988
Coachwork: Crown / Pusher
Engine: 8.3 Cummins
I put this in my grey tank already, I'm going to be making a black tank & will be using another. If you look around you can get them from 6in to 21in & order a water gadge with it.


https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
Stu & Filo. T is offline   Reply With Quote
Old 08-02-2016, 12:58 AM   #805
Site Team
 
Join Date: Jul 2014
Posts: 648
Year: 1998
Coachwork: Bluebird
Chassis: TC2000 RE
Engine: 8.3l Cummins
Rated Cap: 78
Boy that sure looks easy! 316 stainless too.

Maybe I'll just do that and be done with it.

Quote:
Originally Posted by Stu & Filo. T View Post
I put this in my grey tank already, I'm going to be making a black tank & will be using another. If you look around you can get them from 6in to 21in & order a water gadge with it.


https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
aaronsb is offline   Reply With Quote
Old 08-02-2016, 01:22 PM   #806
Mini-Skoolie
 
Join Date: Sep 2013
Location: Mount Victory, OH
Posts: 64
Aaronsb, Wow! I spent some company time over the last few days reading your build. I love the choice of steel instead of wood. I like the wood too and will probably mix the two in my bus (when I find one). I will have to copy a lot of your ideas. Love the air door. I like how you did the roof raise but will borrow MuddaEarth's transistion window idea. I do not want a black water system in my bus. Don't want the extra work. I will have a sawdust crapper in mine. Wife likes the idea! I also compost at home so no big deal there.
superduty_59 is offline   Reply With Quote
Old 08-04-2016, 01:45 AM   #807
Site Team
 
Join Date: Jul 2014
Posts: 648
Year: 1998
Coachwork: Bluebird
Chassis: TC2000 RE
Engine: 8.3l Cummins
Rated Cap: 78
Just a work progress photo. Countertops close to done - working with cesarstone (quartz epoxy) material is interesting. It is pretty forgiving stuff.

Lots of drawers and things going in. Plumbing and wiring next.

So I've about narrowed down all the expensive crap:

Victron Multiplus 12/3000
Approx. 1200-2000 watts of solar panels
Honda eu3000is with propane trifuel conversion (gasoline, propane, ng)
600ah lithium battery pack
12,000 btu mini split A/C
Some sort 15kbtu propane furnace
Auxiliary airtop 2000 diesel heater (already have this one)
Demand hot water heater

Cooking elements are induction burners, fridge is electric only12/24 volt (draws about 80 watts when running, nominal 30% duty cycle on a hot day)

And of course all the crazy ideas I've talked about I can get away with.

I think if I sell the Unimog that about covers the cost of all that stuff. Can't tow it anyway! In all honesty I will probably wait on several pieces of the $technology and keep the truck though.

aaronsb is offline   Reply With Quote
Old 08-04-2016, 02:09 AM   #808
Bus Nut
 
Join Date: Jun 2016
Location: Garden State (rural NJ)
Posts: 383
Nice work! What frig and solar panels did you end up going with?
BusFiend is offline   Reply With Quote
Old 08-09-2016, 08:26 AM   #809
Bus Nut
 
sojourner's Avatar
 
Join Date: Aug 2013
Posts: 379
Year: 1995
Engine: DT408
Ever thought of something like these top indicate tank level? Seems like they would be reliable. I built my holding tanks from plastic drums and will be using something like this although we will not have a black water tank (composting toilet).
5X Liquid Water Level Sensor Horizontal Float Switch Gray 220V New | eBay
__________________
I am an sojourner in the earth; hide not Your Commandments from me. Psalm 119:19

Here is the patience of the saints; here are the ones keeping the commandments of YAHWEH, and the faith of Yahshua. Rev. 14:12
sojourner is offline   Reply With Quote
Old 08-12-2016, 11:51 AM   #810
Bus Nut
 
Join Date: Feb 2012
Location: Salt Lake City Utah
Posts: 958
Year: 2000
Chassis: Blue Bird
Engine: ISC 8.3
I just noticed a $4 ultrasonic range sensor featured on SparkFun's newsletter this morning. I wonder, if it were mounted to the exterior of a plastic tank, whether it would be able to sense through the tank wall or whether the wall would impede the ultrasound pulses enough to make it ineffective. They advertise 2cm to 400cm ranging with "accuracy that can reach up to 3mm."
family wagon is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


» Virginia Campgrounds

Reviews provided by

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 10:02 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2016, vBulletin Solutions, Inc.