JSN-SR04T Depth sounder

I happened to be talking to a Russian guy that informed me that they have discovered you can use the JSN-SR04T ultrasonic sensor underwater as a Depth sounder, its popular on their bait boats. it works essentially the same as the classic SR04 ultrasonic sensor, all you need to do is change your code to compensate for the faster speed of sound to get it working accurately.

Looks very good.

Do you have any more information? Links etc?

(i wonder how they re-programmed it?)

David

Wow! Add some depth charge throwers and you're all set hunting U boats in the pond.

david f wrote:Looks very good.

Do you have any more information? Links etc?

(i wonder how they re-programmed it?)

David

I am not sure how they have programmed the controllers, but the sensor works the same as the sr04 sensor and there are many many instructional pages on how to use them with arduino, the only modification you need to do is change the constant for the speed of sound in water.

I have been doing more testing with these sensors and have a much better understanding of their capabilities,

The single transducer JSN-SR04T works to almost 10 meters but has a minimum working depth of 1.5m so its not ideal for smaller boats in shallow water
The dual transducer  JSN-SR20-Y1has separate transmit and receive transducers so it doesn't need to finish transmission before it can listen, this means it works in as little as 15cm of water under the boat.
The A02YYUW ultrasonic sensor is basically an encapsulated version of the JSN-SR20-Y1 that  can just be attached to the bottom of a hull.


so where I think this could be useful for RC submarines is terrain avoidance. The boat club I used to be a member of had a concrete pond that was only 2 foot deep so all the subs would end up with big scrapes along the bottom where they dived a little too far. using one of the dual transducer sonars would let you set a minimum depth of water under the boat, so it wouldn't dive lower unless there was enough water under the boat

here is an example of how to drive a servo using the sonar and arduino, you just need to up the constant from 29.1 to 125.1 to compensate for the faster speed of sound in water.

https://create.arduino.cc/projecthub/anjalishaw1125/servo-motor-ultrasonic-sensor-e69be3



I'm looking into a making a sonar array for locating underwater objects like fish, sub hide and seek might become a thing lol

arduino phased sonar array, my plan is to mount one under a boat for scanning for underwater objects.

Hello geofrancis,

Just reading this thread - not sure if I am misreading your posts.

Have you got ultrasonic distance sensing working underwater to 10m?

Regards
Jonathan

C-3PO wrote:Hello geofrancis,

Just reading this thread - not sure if I am misreading your posts.

Have you got ultrasonic distance sensing working underwater to 10m?

Regards
Jonathan

I have only tested to a couple of meters, but there are videos of others using it to 10m using the JSN-SR04 sonar it will work underwater using standard sr04 code, all that needs to be changed is the speed of sound to get the measurements to line up. I have been testing these for use on autonomous boats but the tech would work well on subs just as well to stop running aground.

The dual transducer variant is much better for smaller boats as it will work in as little as 15cm of water where the single transducer has a minimum distance of 1.4m in water.


https://discuss.ardupilot.org/t/sonar-based-on-hc-sr04/80476/7

Hi geofrancis,

Thank you for the info - I can see me revisting a previously failed experiment

Regards
Jonathan

C-3PO wrote:Hi geofrancis,

Thank you for the info - I can see me revisting a previously failed experiment

Regards
Jonathan

Sounds interesting, can you elaborate?

Hi geofrancis,

I have been exploring as a joint project with another guy what you can achieve with ranging solutions - we have been looking at ultrasonic, lidar and rf based radar.

We have had mixed success so far but it's still early days - it's a great "duo" as he is an electronics whizz and I get by with coding :)

Regards
Jonathan _._

C-3PO wrote:Hi geofrancis,

I have been exploring as a joint project with another guy what you can achieve with ranging solutions - we have been looking at ultrasonic, lidar and rf based radar.

We have had mixed success so far but it's still early days - it's a great "duo" as he is an electronics whizz and I get by with coding :)

Regards
Jonathan _._

I could probably help, I'm working on sonar arrays for autonomous boats and collision avoidance using a rotating radar system combined with a lidar array. I have tested a lot of different sensors, what are you looking to detect and is it above or under water?

https://discuss.ardupilot.org/t/scanning-rangefinder/81131/31

Hi geofrancis,

Maybe we should compare notes at some point.



Right now this project is back burnered whilst we mess sround with a new concept of a sub leveller

Regards
Jonathan

C-3PO wrote:Hi geofrancis,

Maybe we should compare notes at some point.



Right now this project is back burnered whilst we mess sround with a new concept of a sub leveller

Regards
Jonathan

I think the best approach would be the phased array sonar system from the video I linked to earlier,
https://youtu.be/z4uxC7ISd-c?t=826

I had a look through the code for it here https://github.com/bitluni/SonarScannerV1 and from what I can tell all that would need to be changed is the constant for the speed of sound and changing the transducers for waterproof versions like what I have been using on the depth sounder.

Hi geofrancis,

Have you got any range results from the FMK24-E5200 module?

I know spec states upto 20m and also see some people have struggled to achieve 3m...

Interested in your project experience/results

Regards

Jonathan

C-3PO wrote:Hi geofrancis,

Have you got any range results from the  FMK24-E5200 module?

I know spec states upto 20m and also see some people have struggled to achieve 3m...

Interested in your project experience/results

Regards

Jonathan

yes it worked and I was getting a decent range on it, but i didnt get to do any objective testing on it before I sent it to the software developer to get the driver done. I am getting another one soon for follow up testing now I have a functioning driver interface for the rover control software.