What frequency will you use so you don’t scare the fish away?Can we make a fish finder with this ultrasound device?
Exactly how much sonic power do you think that tiny transducer is going to transmit???? You will be lucky to penetrate more than a few inches. Not to mention the water will diffuse the sound and won't be returned back to the microphone. It is designed for air not water.The ultrasonic transducer will be over the water or closed in something hermetically.
We chose this ultrasonic transducer for Arduino beyond there is a lot of documentation about it.
HC=SR04 is the name of the ultrasonic transducer
Yes, but it is set up for monitoring an area about 3 meters and speed of sound of 340 m/sec. 1498 meters per second in water. The sensor is fast enough, but this difference in wave propagation speed will result in reflections of the sound rather than penetration of the energy into the waterThe ultrasonic transducer will be over the water or closed in something hermetically.
We chose this ultrasonic transducer for Arduino beyond there is a lot of documentation about it.
HC=SR04 is the name of the ultrasonic transducer
TS won't need to worry about differentiating the sound from a fish vs bulk water. It will be all water. Problem solved.Yes, but it is set up for monitoring an area about 3 meters and speed of sound of 340 m/sec. 1498 meters per second in water. The sensor is fast enough, but this difference in wave propagation speed will result in reflections of the sound rather than penetration of the energy into the water
The reflection will cause a huge attenuation and will make it difficult to sense the reflection that comes out of the water vs reflects.
Finally, how do you plan to differentiate the sound from a fish vs bulk water. From above, fish are very stealth (via angular reflection).
Lots of issues with this setup.
I don't need one, they are easy to find at the market.Okay, I'll look for one to buy it.
@GopherT shoots fish in a barrel. He says it is easy.I don't need one, they are easy to find at the market.
If I could find a bluetooth or WiFi fish finder, it would probably be cheaper.
Staying on the shore of the lake is an incredible relaxation.
I had an underwater ultrasound project I wanted to do about 15 years ago but gave up when I couldn't find a source for the transducer. I thought maybe automotive US sensors would be available (though perhaps not quite water proof) but even those weren't on the open market - couldn't even find a datasheet. I could find pictures of them but nothing more. The car companies have all gone to RF or video based sensors so even that's not an option any more. I looked briefly at waterproofing existing sensors but concluded that the emitter needed to be mechanically coupled to the external surface of the sensor to work.You probably can make one but you will need to start with a transducer intended for use under water. Unfortunately the only ones I could find come with a fish finder attached! I bet you couldn't build one cheaper than this: http://www.ebay.co.uk/itm/Outlife-0...374145?hash=item41cd306141:g:UWEAAOSwCdJZloyX
They have blueteeth in Pittsburgh lakes and streams?
Couldn't you use a transducer off of an ultrasonic cleaner?You probably can make one but you will need to start with a transducer intended for use under water. Unfortunately the only ones I couldfine come with a fish finder attached! I bet you couldn't build one cheaper than this: http://www.ebay.co.uk/itm/Outlife-0...374145?hash=item41cd306141:g:UWEAAOSwCdJZloyX