I hope I've got the right forum here, please feel free to let me know if not!
I'm currently working on a small boat project and need a way to detect when the water is getting shallow. It doesn't need to be too accurate I'd simply like to be able to tell when it's less than about a metre deep.
I've attempted to use one of these but it doesn't work underwater at all: 1pcs Waterproof Ultrasonic Module Distance Measuring Sensor for Arduino TE501 for sale online | eBay
From what I've read this is to be expected as the frequencies of air and water sounders are pretty different, even when catering for the speed difference of sound.
Another suggestion that I've come across is to use an NMEA compatible fish finder. Has anyone had any experience with integrating with these or able to suggest one that would work (preferably something fairly cheap)?
I was looking at these but not too sure if I'd be able to hook into it at all: Lucky FF717 100ft Fishfinder Portable Sonar Fish Finders Depth Echo Sounder for Fishing PK FF1108 FF718# A5|fishfinder portable|sonar fish finderportable sonar - AliExpress
I'm also open to any other suggestions that anyone may have.
Thanks for your help!