It is a rechargeable waterproof lap counter that does not use a water proof bag separately.
Project tutorial by Oscar Seo
I also thought about swimming time.
When you start swimming, use a B-type switch (or a piezoelectric switch) at the start point and use one more end switch(A-type) to measure the total exercise time. I think it's okay to use the long hit button as an end switch.
In fact, attaching the Lap Counter to the tiles inside the pool was a bigger problem.
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