4.9 Project: Water Level Monitoring System

Pay attention! Do not overflow water from plastic pools in experiments. Spilling water on other sensors may cause not only a short circuit to disturb normal operations but also heat generation and even explosion. Do be extra careful! Especially for younger users, please operate with your parents. To guarantee security, please obey guidances and safety regulations.

4.9.1 Flow Diagram

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4.9.2 Water Level Sensor

Description:

The water level sensor is easy to use, portable and cost effective. It integrates a series of exposed parallel lines to measure the volume of water and droplets. Not only is the sensor smaller and smarter than other water detectors, but it also features:

  • Smooth transition between water volume and analog volume;

  • Strong flexibility. The sensor outputs basic analog values;

  • Low power consumption and high sensitivity;

  • Directly connect to microprocessors or circuits, and is suitable for various development boards and controllers, such as KidsBlock controllers, STC and AVR single-chip microcomputers.

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Wiring Diagram:

Connect the water level sensor to io33.

Attention: Connect yellow to S(Signal), red to V(Power), and black to GND. Do not reverse them!

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Test Code:

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Test Result:

Open the serial monitor.

Touch the detection area of the sensor with a wet finger and the currently detected value will be printed on the monitor (range: 0~4095).

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4.9.3 Water Level Monitoring System

The water level monitoring system supervises the change of water level to clarify problems in time and take measures to avoid disasters. It is widely used in water conservancy projects, urban drainage and environmental monitoring.

Wiring Diagram:

  • Connect the water level sensor to io33.

  • Connect the buzzer to io16.

  • Connect the LCD1602 to BUS I2C.

Attention: Connect yellow to S(Signal), red to V(Power), and black to GND. Do not reverse them!

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Test Code:

Code Flow:

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Code:

  • Initialize the LCD and turn on its back light; clear all display and then print water level.

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  • Define a variable as the detected water level.

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  • Read the sensor value and display it on LCD.

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  • Determine the water level value. If it is greater than 2000, the buzer will alarm.

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Complete code:

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Test Result:

LCD displays the real-time value of water level. In the experiment, we cover the detection area with water to stimulate the water level. When the detected value exceeds the threshold, the buzzer starts to alarm.

4.9.4 FAQ

Q: Is water level sensor waterproof?

A: With the exception of the detection area, the sensor is not waterproof. Spilling water on other area may result in a short circuit.