hi all. I’m thinking of starting a new project. as a diver I’m joining project baseline which monitors the health of lakes (ph, temperature, nitrate level,…).
what I would like to build is a data logger which tracks temperature, ph and if possible oxygen and nitrate levels in the water.
The finished gizmo would be installed under water at about 5m (so everything but the sensors need to be in a waterproof box).
that was the “easy” part, the difficult part I imagine will be retrieving the data. In an ideal world the gizmo would stream (or send at regular intervals) it’s data to a webserver, so I could make a website that shows realtime data.
I would however be fine with any method of retrieving the data that doesn’t include taking the entire thing out of the water. possibilities I’m considering:
- RFID / NFC so I could take one of those cards with me and hold it up to the gizmo to download the data to the card (if that’s even possible).
- wireless network: would this work through water? and how far?
- some sort of SMS module to send the data via text messages (again does that work under water?)
- any other wireless technology
basically I’m a novice. I bought a fez spider kit last year and I’m looking for a more serious project to make use of it
any help/ideas you guys could provide about the possible sensors, modules and power supply would be apreciated.
oh and if this seems like overreaching my other idea would be an underwater GPS so I can track my movements