Water Drinking Reminder: Fun BBC micro:bit Project (2026)

Water Drinking Reminder using BBC Micro:bit – Overview

The Water Drinking Reminder is a beginner-friendly STEM project using the BBC Micro:bit. It reminds users to drink water at regular intervals using LED icons and sound alerts. Students learn timers, variables, loops, and event-based programming while understanding healthy hydration habits.

Innovation

Unlike a normal reminder, the Micro:bit provides interactive visual and audio notifications and can be reset with a button press.

Materials Required for Water Drinking Reminder

• BBC Micro:bit
• USB cable
• Computer with Microsoft MakeCode

Learning Objectives

Learn variables, loops, timers, conditional statements, LEDs, buttons, and simple program logic.

Procedure for Water Drinking Reminder

• Create a new MakeCode project.
• Initialize a variable called Time.
• Display a happy icon on start.
• Use a Forever loop with a pause block to simulate time passing.
• Increase the Time variable after each interval.
• When the value reaches the reminder limit, display a water-drop LED pattern, scroll the message ‘DRINK WATER’, and play a melody.
• Press Button A to reset the reminder and begin counting again.

Detailed Block-Based Coding Logic

Step 1: Create a New Project

Open Microsoft MakeCode and click New Project.

Name the project: Water Drinking Reminder

This creates a workspace where you can build the program using drag-and-drop coding blocks.

Purpose

• Starts a new Micro:bit project. 
• Organizes all coding blocks in one workspace. 

Step 2: Add the On Start Block

The On Start block runs only once when the Micro:bit is powered on or reset.

Inside this block:

Set Time = 0

Explanation

The variable Time stores how many reminder intervals have passed.

Every time the program starts, the value begins from zero so the reminder starts fresh.

Concepts Learned

• Variables 
• Initialization 

Step 3: Display a Welcome Icon

Still inside On Start, add

Show Icon (Happy)

Explanation

When the Micro:bit starts, it displays a smiling face to indicate that the reminder system is active.

This lets the user know the program has started correctly.

Concepts Learned

• LED Display 
• Visual Feedback 

Step 4: Add the Forever Block

Drag the

Forever

block into the workspace.

Everything inside this block repeats continuously while the Micro:bit is powered.

Explanation

The reminder should continue checking time repeatedly.

The Forever block allows the Micro:bit to run continuously.

Concepts Learned

• Infinite Loop 

Step 5: Wait for a Time Interval

Inside the Forever block add

Pause (10000 ms)

(10 seconds for classroom demonstration. It can represent 1 hour or any desired interval in real-life use.)

Explanation

The pause block prevents the program from running too quickly.

It creates a fixed waiting period before checking again.

Concepts Learned

• Timing 
• Delays 

Step 6: Increase the Counter

After the Pause block add

Change Time by 1

Explanation

Each completed interval increases the Time variable.

Example:

The variable acts as the reminder timer.

Concepts Learned

• Variables 
• Counters 

Step 7: Check the Reminder Condition

Add an If block.

If Time ≥ 3

(You may choose any reminder value.)

Explanation

The Micro:bit compares the current value of Time with the reminder limit.

When the value reaches three, it knows it is time to remind the user to drink water.

Concepts Learned

• Conditional Statements 
• Decision Making 

Step 8: Display the Reminder

Inside the If block add

Show LEDs

Create a simple water drop pattern.

Then add

Show String

"DRINK WATER" 

Explanation

The LED image immediately grabs attention.

The scrolling message clearly tells the user what action to take.

Concepts Learned

• LED Matrix 
• Text Display 

Step 9: Play a Melody

Still inside the If block add

Play Melody

Power Up

or

Play Tone

Explanation

The sound alert helps the reminder be noticed even when the user is not looking directly at the Micro:bit.

Combining light and sound creates an effective notification.

Concepts Learned

• Audio Output 
• User Notifications 

Step 10: Reset the Reminder

Add

On Button A Pressed

Inside this block add

Set Time = 0

Show Icon (Happy)

Explanation

After drinking water, the user presses Button A.

The reminder counter resets to zero and the Micro:bit starts counting again for the next reminder cycle.

This makes the reminder reusable instead of a one-time alert.

Applications

Healthy lifestyle reminders, classroom STEM learning, wellness awareness, and beginner IoT concepts.

Conclusion

This Water Drinking Reminder project combines coding with healthy daily habits. It demonstrates how the Micro:bit can solve simple real-world problems while teaching core programming concepts.

FAQs

1. What is a Water Drinking Reminder using BBC micro:bit?

A Water Drinking Reminder is a beginner-friendly micro:bit project that uses a timer, LED display, sound, and buttons to remind users to drink water at regular intervals.

2. How does the micro:bit water drinking reminder work?

The program uses a variable to count reminder intervals. When the counter reaches the chosen value, the micro:bit displays a water-drop pattern, shows “DRINK WATER,” and plays a sound.

3. Can I change the water reminder interval?

Yes. You can change the Pause duration or the reminder counter value in MakeCode to create a shorter or longer reminder interval.

4. Why is a variable used in this project?

The Time variable stores the number of reminder intervals that have passed. The program uses this value to determine when to trigger the reminder.

5. What programming concepts are learned?

Students learn variables, loops, timers, conditional statements, LED displays, buttons, events, and program logic.