Adding sensors to your Arduino opens up a whole new world of exciting projects. ... Measuring the pH level of a water source can give you a range of information about the liquid.

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 ...

The sensor area in contact with the medium consists of a metal oxide layer if a pH sensor is required, or a PVC membrane with an ion-selective ionophore converts if it is to be a chemical sensor. Two ...

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.