🔊 Buzzer

📌 Description

A buzzer is a small device that makes sounds when it receives signals. It can beep, buzz, or even play simple tones.

🎯 Use

In our projects, buzzers are used to:

• Make alarms or warning sounds.
• Play short melodies or beeps.
• Give audio signals when something happens.

👉 Think of the buzzer as the robot’s voice — it speaks with sounds instead of words.

Module parameters

• Supply voltage: 3.3V/5V

• Connection: PH2.0 3P terminal

• Installation method: double screw fixing

🖥️ Code Explanation

import music
import time

midi = music.MIDI(25)       # Connect buzzer to pin 25
while True:
    midi.pitch_time(440, 1000)   # Play tone at 440 Hz for 1 second
    time.sleep_ms(100)           # Pause for 0.1 second
    midi.pitch_time(880, 3000)   # Play tone at 880 Hz for 3 seconds
    time.sleep_ms(100)           # Pause for 0.1 second

Step by Step

1. import music → Brings in tools to play sounds.
2. import time → Lets us add pauses between sounds.
3. midi = music.MIDI(25) → Connects the buzzer to pin 25 of the board.
4. while True: → Starts a loop that repeats forever.
5. midi.pitch_time(440, 1000) → Plays a sound at 440 Hz (like the note A) for 1 second.
6. time.sleep_ms(100) → Waits 0.1 second before the next sound.
7. midi.pitch_time(880, 3000) → Plays a higher sound at 880 Hz for 3 seconds.
8. time.sleep_ms(100) → Waits again before repeating.

👉 Together, the buzzer plays two tones in a loop: one short low sound, then one longer high sound.

✅ Conclusion of the Test

• • If the buzzer makes alternating sounds (low then high), the program is working correctly.
  • This test shows how we can control pitch (how high or low the sound is) and duration (how long it plays).
  • Later, we can combine different tones to make alarms, signals, or even simple songs.