CQRobot CQRSENYW001 Manual

Non-Contact Water or Liquid Level Sensor
Description
CQRobot Non-contact type liquid level sensor, It utilizes advanced signal processing technology by
using a powerful chip with high-speed operation capacity to achieve non-contact liquid level detection.
No contact with liquid makes the module suitable for hazardous applications such as detecting toxic
substances, strong acid, strong alkali and all kinds of liquid in an airtight container under high pressure.
Connect the sensor's 3-Pin cable directly to the microcontroller, such as the Arduino motherboard,
and the signal terminal (Green Line) collects digital signals to determine if the sensor senses liquid.
At the same time, the sensor is also compatible with the Raspberry Pi motherboard, we provide the
corresponding Raspberry Pi connection method and test code.
The sensor has 2 DIP switches (SET), and the DIP switch on the right controls the output voltage
(High Level) of the signal end (Green Line); when the DIP switch is dialed up, the high level is 5V;
When the code switch is dialed down, the high level is 3.3V. The SET dial switch is used to set the
signal end (Green Line) output to high and low level after detecting the liquid; when the dial switch is
dialed up, the sensor detects that the liquid signal end (green line) is high level, no liquid is detected.
The signal end (Green Line) is low level; when the dial switch is dialed downward, the sensor detects
that the liquid signal end (Green Line) is low level, and does not detect that the liquid signal end (Green
Line) is high level.
Working principle: use the sensing capacitance of water to detect the presence of liquid. When there
is no liquid approaching the sensor, due to the existence of distributed capacitance on the sensor, the
sensor has a certain static capacitance to the ground, when the liquid level rises slowly. When
approaching the inductor, the parasitic capacitance of the liquid will be coupled to the static capacitor,
causing the final capacitance of the inductor to become larger. The changed capacitance signal is then
input to the control IC for signal conversion, converting the changed capacitance into some kind. The
amount of change in the electrical signal is then detected and judged by a certain algorithm. When the
amount of change exceeds a certain threshold, the liquid level is considered to reach the sensing point.
Funcition
1. Non-contact liquid level sensor, suitable for non-metallic container outer wall without direct
contact with liquid, no corrosion by corrosive liquid such as strong acid and alkali, free from
scale or other debris.
2. Intelligent liquid level reference adjustment and liquid level memory function, liquid level status
display, high and low level output.
3. The detection is accurate and stable, and the boiling water level can be detected.
SKU: CQRSENYW001, ASIN: B07ZMHJ6NN