Happy New Year (2009). I wish the best feelings in life!  Feliz Ano Novo (2009). Eu desejo os melhores sentimentos da vida. Márcia Ferraresi Araújo Student...
Hello, I'm trying to construct an underwater detection system capable of detecting an object the size of a softball or larger when it enters the water. There...
On Wed, Jan 7, 2009 at 7:35 PM, sciencegirl31415 <sciencegirl31415@... ... Hello sciencegirl, - how is this water contained? a swimming pool, a tank,...
... There are few possible solutions to pinpoint a source of light (LED) resulting in distances and positions. One I am considering right now is the use of...
Thank you for the response Wagner! The water is contained in a swimming pool with calm water, 30ft wide, 50 ft long, 15ft deep, no light in the water. The...
Thank you Muhammad! Could you recommend an "off the shelf" sonar range finder that could be altered to create an electric signal/alarm when the range changed?...
Years ago based on my daughter's national research, I developed an electronic fence to protect small children to falling into a swimming pool. The fence was...
Hi there people. I am working on a 2-electrodes ecg project but I am having some problems. I can have my circuit working when I use a simulator but not when I ...
Can you just measure the conductivity of water. With a gap in your prob that in normal condition no current can pass and as soon as it getting wet the path...
I think the conductivity change from a softball dropped randomly into a swimming pool of water is going to be REALLY hard to measure... unless Scott has some...
What sort of signal ARE you getting? Is it nothing at all? Is it DC saturation? Is it 60 Hz? Try using a battery powered scope, or a scope running on an...
I don't know why it is hard to measure. The glouse meter measure conductivity of a test strip after you put a drop of blood to wet the test paper. Here all you...
If you're still considering sonar, the closest off-the-shelf (OTS) thing is a fish finder, or a depth sounder. Here's a depth sounder (depth transducer),...
Scott, Are you proposing to use the conductivity sensors to detect the splash from the object (softball), which falls into the pool? I think, in this problem...
If the pool water can be trusted to be reasonably clear, you might consider illuminating the surface from a point source below one corner of the pool - and...
Nick: You are right. I misunderstood the problem. ... splash ... the ... coat ... have ... <sherpadoug@> ... randomly ... measure... ... waves, ... it ... add ...
Why not use an accelerometer? I'm pretty sure that's how comercial units work. Your unit needs to float freely in the pool and be weighted at the bottom so...
... there is not) ... As I re-read that definition, this is a different problem. Does the poster need to detect the presence of an object as stated, or the ...
... As far as I read, this is to identify and alert the dangerous intrusion of a small child into the swimming pool. The post definition doesn't matter much....
When my electrodes are connected to a simulator I get the ecg waveform exactly as I wanted it to be shown. When I substitute the simulator for a real person I...
Wagner, your post is incomplete. I you negligently failed to mention the legal burden. Clearly, we are the bad guys here - I'm certain you will agree - so let...
Hello All I have to do a miniproject for this semester.Im a biomedical Engineering student.I plan to do a lung function testing device,especially for detecting...
Hi Tom and others, My grump about swimming pool security issues, comes from more than 36 years of working in industrial electronic environment and its ambient ...
... people stop smoking, isn't it? I think that is boldly presumptuous, Wagner. It is not your business why someone might want to clean their air - and to...
I have seen an electronic spirometer once, it had only an LCD display. It had a light turbine (paddle wheel). The wheel was spun by an exhaled air. Probably,...
... upon ... not ... fatalities? ... Thank you for the wise decision of stop smoking, I also gave up 26yrs ago. Even if you want you should not smoke in...
Dear Tom and Wagner, With all due respect... I hope, we don't have a flame starting. This message board is dedicated to a very superficial topic - sensors. ...
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