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Lesson 25: Water Level Sensor Module

In this lesson, you’ll learn how to use an ESP32 Development Board for reading a water level sensor. We’ll cover continuously monitoring the sensor’s analog value and displaying it on the serial monitor. This project provides a great opportunity to grasp sensor integration and analog data reading with Arduino, making it ideal for beginners in electronics and microcontroller programming.

Required Components

In this project, we need the following components.

It’s definitely convenient to buy a whole kit, here’s the link:

Name	ITEMS IN THIS KIT	LINK
Universal Maker Sensor Kit	94	Universal Maker Sensor Kit

You can also buy them separately from the links below.

Component Introduction	Purchase Link
ESP32 & Development Board (ESP32 Board)	BUY
Water Level Sensor Module	-
Breadboard	BUY

Wiring

../_images/Lesson_25_Water_Level_esp32_bb.png

Code

Code Analysis

Initializing the Sensor Pin:

Before using the water level sensor, it’s pin number is defined using a constant variable. This makes the code more readable and easier to modify.
```
const int sensorPin = 25;
```
Setting Up Serial Communication:

In the setup() function, the baud rate for serial communication is set. This is crucial for the Arduino to communicate with the computer’s serial monitor.
```
void setup() {
  Serial.begin(9600);  // Start serial communication at 9600 baud rate
}
```
Reading Sensor Data and Outputting to Serial Monitor:

The loop() function continuously reads the sensor’s analog value using analogRead() and outputs it to the serial monitor using Serial.println(). The delay(100) function makes the Arduino wait for 100 milliseconds before repeating the loop, controlling the rate of data reading and transmission.
```
void loop() {
  Serial.println(analogRead(sensorPin));  // Read the analog value of the sensor and print it to the serial monitor
  delay(100);                             // Wait for 100 milliseconds
}
```