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Lesson 25: Water Level Sensor Module

In this lesson, you will learn how to use the Raspberry Pi Pico W to measure water levels with a water level sensor. You’ll understand how to connect the sensor to the board, read its analog output using MicroPython, and interpret these readings to determine water levels. This practical session is aimed at developing your skills in sensor integration and data acquisition with the Raspberry Pi Pico W.

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
Raspberry Pi Pico W	BUY
Water Level Sensor Module	-
Breadboard	BUY

Wiring

../_images/Lesson_25_Water_Level_Sensor_Module_bb.png

Code

import machine
import utime

# Initialize an ADC object on GPIO pin 26.
# This is typically used for reading analog signals.
water_level_sensor = machine.ADC(26)

# Continuously read and print sensor data.
while True:
    value = water_level_sensor.read_u16()  # Read and convert analog value to 16-bit integer
    print("AO:", value)  # Print the analog value

    utime.sleep_ms(200)  # Wait for 200 milliseconds before the next read

Code Analysis

Importing Libraries

Here, we import necessary libraries: machine for hardware interactions and utime for time-based functions.
```
import machine
import utime
```
Initializing the Water Level Sensor

An ADC object is created on GPIO pin 26 to read analog signals from the water level sensor. ADC is crucial for converting the sensor’s analog signals to digital format that the microcontroller can process.
```
# Initialize an ADC object on GPIO pin 26.
water_level_sensor = machine.ADC(26)
```
Reading and Printing Sensor Data

The while True loop enables continuous reading of the sensor data. read_u16 method converts the analog signal to a 16-bit integer. The value is printed, and the loop pauses for 200 milliseconds using utime.sleep_ms(200) to prevent rapid firing.
```
while True:
    value = water_level_sensor.read_u16()  # Read and convert analog value to 16-bit integer
    print("AO:", value)  # Print the analog value

    utime.sleep_ms(200)  # Wait for 200 milliseconds before the next read
```