[James Eckert] got his hands on a Freescale MPR121 capacitive touch sensor. The chip in question speaks I2C and senses up to twelve simultaneous capacitive sense electrodes; break-out boards are ...

Capacitive sensors, on the other hand, can be isolated from the water itself, and thus sense the levels without being subject to such degradation. [Magnus] pairs the off-the-shelf capacitive ...

Two complementary sensor technologies will be discussed in detail in this chapter: capacitive electric field based, and inductive (eddy current) electromagnetic field based. Figure 8.1.1: Noncontact ...