Here is a tested Arduino project that uses 3 sensor probes as water level indicator with 3 leds and one LCD display + a simple controller that turns on a motor when the water has reached the desired ...

At I/O, Google Will Be Tracking Things Like Noise Level And Air Quality With Hundreds Of Arduino-Based Sensors. Drew Olanoff. 11:56 AM PDT · May 13, 2013.

Arduino Nano. DHT22 and BMP280 sensors. Raspberry Pi Zero W. Steps: Arduino collects sensor data and sends it via serial to the Pi. Pi parses and stores data using Python + SQLite. Optional: Build a ...