Aerosol activation and plumbing

I'm looking to inflate, say, a beach ball or one of those rubber rings to create lift for a submersible. If everything goes wrong, I'm hoping to use standard deodorant aerosol cans to inflate a bag of some kind which will increase buoyancy and raise the stricken craft.

From an arduino point of view, controlling this is simple and I've got the logic sorted, just not the mechanical system to allow the aerosol to spray.

Currently, my plan is to take the top of the can off so its just a bare 'stalk' like this:

Then use a solenoid or similar to pull the stalk down (would need to be pretty strong) and then have tubing to the inflatable bag.

Anyone got any better ideas or direction?

f everything goes wrong, I'm hoping to use standard deodorant aerosol cans to inflate a bag of some kind which will increase buoyancy and raise the stricken craft.

Make the craft positively buoyant to begin with, and dump ballast to bail-out is a more fail-safe option. Trieste used an electromagnet to hold the ballast in place, so if the battery failed, the ballast would be released automatically. Other options involve things like aniseed balls or gobstoppers dissolving.

Plumbing at pressure is tricky and complex.

I have a project I'm going to be working on down the road that will involve aerosol dispensing and what I am thinking about using is a hacked up version of this http://www.airwick.us/automatic-sprays-freshmatic-ultra-automatic-spray.php. We have them all over the house, it's gear driven but it only works on aerosol cans that have a 90 degree nozzle.

Or, do what the military and rocketeers do, and use squibs for everything ]:D

wayneft:
I have a project I’m going to be working on down the road that will involve aerosol dispensing and what I am thinking about using is a hacked up version of this http://www.airwick.us/automatic-sprays-freshmatic-ultra-automatic-spray.php. We have them all over the house, it’s gear driven but it only works on aerosol cans that have a 90 degree nozzle.

Ah ha, good idea. I’ll buy one today and have a look through it.

I also bought some solenoids from eBay (<£5) which were cheap enough to play about with.

I understand that there are better ways of doing it, I just enjoy using the least efficient way of doing something for some reason :slight_smile: I’ll probably have a counterweight as well, so I don’t lose everything

Hi, A regular servo with a cam could get plenty of pressure..

this one: http://arduino-direct.com/sunshop/index.php?l=product_detail&p=199 (click on "larger image")

Has 8 kg of force at 1 cm radius already. Maybe just a plain servo horn on top of the usual spray nozzle thing...

DISCLAIMER: Mentioned stuff from my own shop...

Regular servos are tricky to waterproof

wayneft: I have a project I'm going to be working on down the road that will involve aerosol dispensing and what I am thinking about using is a hacked up version of this http://www.airwick.us/automatic-sprays-freshmatic-ultra-automatic-spray.php. We have them all over the house, it's gear driven but it only works on aerosol cans that have a 90 degree nozzle.

I bought one of these - Glade sense & spray - which was on offer at Tesco for a fiver. It uses a hook to press down on the top of the aerosol and release the spray. It uses gears and a cam to pull the hook down, then reverses the motor. terrykings servo would do it, but I think a less powerful motor with gears like the Glade system would suffice. The servo wouldn't need to be waterproofed AWOL as the spray would be sent through IV PVC tubing.

Thought it might be useful if you're looking for a version that doesn't require a right-angle nozzle.

Out of interest, where can I find a squib, can civilians purchase them?

No, sorry you can't buy them, and unless you think you look good in an orange boilersuit, you shouldn't try to make them.

Alternatively simply put an (some) AlkaSeltzer or any similar effervescent tablets into "balloon" and use a small solenoid to let the water in, you'll end up with enough CO2 to lift the Titanic

Out of interest, where can I find a squib, can civilians purchase them?

Hi,

They are called "electric matches" when used for firing many things like fireworks. You can get plenty of supplies here:

http://www.skylighter.com/mall/ignition.asp?fl=search#GN5030?

scroll down to "Electric Ignition Supplies".

I use this stuff for Summer Solstice Midnight celebration...

and people are making Arduino-controlled fireworks displays...

I used to have an Explosives license in New York and made a very effective capacitive-dischange 'blasting machine'. But that was years ago...