I have a need to build a device to help keep me safe while freediving and was wondering if anyone here could provide some guidance.
What I need is a small devise that i can wear on my wrist (or on my forearm inside my wetsuit) that will monitor my depth and vibrate 5 seconds or so after I surface from a dive. Why do I need this? I currently dive with a safety vest that will inflate if I do not press a button 15 seconds after surfacing from a dive. This is to protect me from drowning from a blackout at the surface. After an hour of diving I will forget to clear the button, the vest will inflate and my dive is over for the day.
So again, all the device needs to do is know when I return to the surface from a breath hold dive. Once I’m at the surface it will need to wait 5 seconds then vibrate for a couple seconds (like a cell phone) to remind me to clear my vest, that’s it.
Ideally this would be incorporated into the vest but the designer doesn’t want to tackle this at the moment.
I have a small background with DIY electronic kits but I really need help on where to start. Can anyone help provide some guidance? Thanks!