Micro:bit Guide¶

Objective¶

The goal of this program is to:

• Detect a loud sound → When the micro:bit hears a noise, it triggers the music playback.

• Play the melody → Using music blocks, the micro:bit plays a sequence of notes.

• Loop twice → The melody repeats twice before stopping.

Step-by-Step Guide¶

Step 1: Initialise the Music System

• Activate the built-in speaker

• Use set built-in speaker to on to ensure the micro:bit can produce sound.

• Adjust the volume

• set volume to 255 to make sure the audio is loud and clear.

Step 2: Detect Sound

• Use the "On Loud Sound" Event

• When the micro:bit detects a loud noise (such as a clap or knock), the program initiates.

• This is managed using on loud sound detected.

Step 3: Play the Melody Twice

• Use a Loop for Repetition

• A repeat 2 times block ensures the melody plays twice before stopping.

• Define the Melody

• Example note sequence:

  play note G for 1 beat

  pause 500 milliseconds

  play note E for 1 beat

  play note A for 1/2 beat

  play note G for 1/2 beat

  pause 500 milliseconds

  play note F for 1/2 beat

  play note F for 1/2 beat

Principles and Logic Behind the Code¶

Event-Triggered Execution

• Using on loud sound detected, we ensure that the program only runs when sound is detected instead of looping indefinitely.

Controlled Repetition

• The repeat 2 times loop guarantees that the melody plays exactly twice before stopping, maintaining a predictable behaviour.

Timing and Musical Flow

• Notes are structured with different durations (1 beat, 1/2 beat), making the melody sound natural.

• Pauses (500 milliseconds) add spacing to improve rhythm.

By following these steps, your micro:bit will successfully respond to sound, play a melody twice, and then stop!