This sounds awesome! I'm low vision and struggle with depth perception and contrast. I used to swim laps several years ago and was thinking about getting back into it since running on a treadmill is really boring and it's not really possible to run outdoors with a cane like I used to. Something like a wristband device such as a fitbit that could vibrate to alert at a user defined distance from the wall and to keep in the lanes would be awesome. I don't know what you had in mind but that's what popped into my head. Really cool idea, I would definitely be interested in trying something like this.

Sounds interesting. The only things I've seen in the past are sprinkler systems which will let someone know when they are near the wall. The key I think for a device like this would be size and weight. If it's too heavy, it'd slow down the swimmer too much and not be practical for competitive use. Please keep us updated on your progress.

Yeah, I'm really interested in this. Unfortunately, the price is going to be the biggest factor. In order to swim at all, I'd have to pay for some kind of fitness membership just to get access to a pool. I'm not sure how much money I could justify, on top of that, to start on a new hobby. $50? Sure. $150? Probably not.