I've got an Arduino/Bluetooth (Bluetooth Bee-Standalone). I've hooked it up with an HC-SR04, it's intended to be mounted at the top of a rain barrel to measure the water depth.

The winning team, mentored by Prof. K.S. Rajan, Prof. Rehana Shaik and Prof. Sachin Chaudhari, decided to develop and deploy affordable sensors that could not only measure water flow rates to ...