Breaking News
Engineering Investigations

Precision Control of a Radio-Controlled Submarine

NO RATINGS
1 saves
View Comments: Newest First | Oldest First | Threaded View
Page 1 / 7   >   >>
Aeroengineer
User Rank
Author
Re: Optical TOF!
Aeroengineer   6/25/2016 12:10:12 AM
NO RATINGS
YEs, the are pretty cool little sensors that I am sure I can find a use for in some other areas of my projects.  They actually still perform well in water, so I think it would be fun to use them for sensing bottoming out on things.

 

I was looking at some of the things that ST posted on the web about their Sensors 2016 display.  I am really interested in a few of their devboards coming out later this year.  The microphone array one really looked pretty slick and could have applications to my subs.

Aeroengineer
User Rank
Author
Re: Optical TOF!
Aeroengineer   6/25/2016 12:07:16 AM
NO RATINGS
I love those things, but I agree that they just lack the precission/accuracy for this effort.

TonyTib
User Rank
Author
Re: Optical TOF!
TonyTib   6/24/2016 2:23:54 PM
NO RATINGS
Based on a chat yesterday with ST at Sensors 2016, I'd say they're cool, but not a good match for this application.  First, the older VL6810 is a better match, because it's shorter range.  But even for the shorter range, performance at close distances (IIRC <2cm or so) isn't great.  Accuracy is best in the middle range (say 2%), worse at min and max distances (more like 7%).

 

GSKrasle
User Rank
Author
Optical TOF!
GSKrasle   6/22/2016 8:36:41 PM
NO RATINGS
Oooo! I just saw this! 

It's a Time-of-Flight optical sensor for short distances!

It may not be accurate enough for your purpose (3%), but it's pretty revolutionary:

http://www.designnews.com/author.asp?section_id=1386&doc_id=280790&itc=dn_analysis_element&

It's a few dollars.

Aeroengineer
User Rank
Author
Re: Capacitive sensor
Aeroengineer   6/22/2016 7:28:25 PM
NO RATINGS
That is the problem with this is that the tank wall is metal.  I do not think that this approach would work with the metal wall.  I have thought about how to try and get this onto the wall of the tank internally, but because the piston slides over it with an oring, I am concerned that any silution would be less than reliable and cause leaks.

Aeroengineer
User Rank
Author
Re: Capacitive sensor
Aeroengineer   6/22/2016 7:27:04 PM
NO RATINGS
Interesting, are you proposing to use both in combination of one another, or each as its own stand alone solution?  I wonder how muc that dielectric constant changes across the different types of water that I might be in.  Perhaps it would be fun to go and test this.

mithrandir
User Rank
Author
Re: Capacitive sensor
mithrandir   6/20/2016 2:10:28 PM
NO RATINGS
And if you're interested, There is a nice little kit which you can stick on the ballast tank outside(as long as its not metal) to measure liquid level ;)

http://www.cypress.com/documentation/development-kitsboards/cy8ckit-022-capsense-liquid-level-sensing-shield

 

traneus
User Rank
Author
Capacitive sensor
traneus   6/19/2016 5:16:27 PM
NO RATINGS
A capacitive sensor could measure the volume of water in the ballast tank, without measuring the plunger position.  Water has dielectric constant of 80 or so, while air has dielectric constant of 1.

Capacitor plates on the ends of the tank, see two capacitors in series, separated by the plunger. Capacitor plates on the sides of the tank, see two capacitors in parallel, separated by the plunger. Capacitor plates on the sides of the tank, will show capacitance proportional to the volume of water.

Aeroengineer
User Rank
Author
Re: radio frequency used
Aeroengineer   6/18/2016 12:38:52 PM
NO RATINGS
Well, I am sure that if you ask Max, he can get us in contact via email outside of this and I can share some things with you.

Gofor
User Rank
Author
Re: radio frequency used
Gofor   6/18/2016 12:14:07 PM
NO RATINGS
Yep.  Bricks and lead sinkers come to mind :-)

Google around a bit.  I know there are several old Submariners who have built model submarines of various classses and sizes.  I think some even shoot torpedoes and missiles.

Passive sonar might be interesting.  Not sure what kind of "biologics" sounds catfish make.

Active sonar might not be very usefull unless your friend has a Russian "Whiskey" class model boat.

I plan on building a model myownself, "real soon now."

 

Page 1 / 7   >   >>

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
Like Us on Facebook
EE Times on Twitter
EE Times Twitter Feed