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. What's the best ...

Based on dual BMP280 pressure sensors and a KY-013, water, temperature sensor this project is intended for monitoring evaporative and decorative ponds, creeks or wells. The functionality could also ...