I am looking for a device that has following properties:
- Can transmit data underwater (sub 2.5GHz,1-2m below surface)
- Very small (max. 15mmx15mmx2mm)
- In-built microprocessor
- Able to read sensors
So far I found the XBee, which is too big, and the Bluegiga BLE121LR Bluetooth® Smart Long Range Module, which uses Bluetooth. I read that Bluetooth is really unreliable underwater. Is that true even for only 1-2m? http://www.silabs.com/products/wireless/bluetooth/bluetooth-low-energy-modules/ble121lr-bluetooth-smart-long-range-module
I have little experience when space becomes the limiting factor, that's why I am asking here. Thanks!