A system to detect presence of liquid in a pipe using 2-core wire as capacitive sensor

摘要

A system to detect presence of liquid in a pipe using 2-core wire as capacitive sensor Presence of liquid in a pipe is detected using a 2-core wire as a capacitive sensor. The 2-core wire is inserted in the pipe shown in Fig-2. One of the two core wire is connected to ground and the other is directly connected to the microcontroller. A third wire is also used to sense noise. The sensor system is calibrated manually. The calibration information is stored in memory of microcontroller during calibration. Due to the design, the entire system becomes very economical and easy to install and use.