# Project objective: To test a passive buzzer to play a melody at one-second intervals with start/stop functionality using a button.
#
# Hardware and connections used:
#   - Passive buzzer GND to Raspberry Pi Pico GND
#   - Passive buzzer + Pin to GPIO Pin 15
#   - Button one pin to GPIO Pin 14 and the other to GND
#
# Programmer: Adrian Josele G. Quional

from picozero import Speaker, Button
from time import sleep

# Creating Speaker object connected to GPIO 15
speaker = Speaker(15)

# Creating Button object connected to GPIO 14
button = Button(14)

# Melody to be played by the passive buzzer
melody = [262, 294, 330, 349, 392, 440, 494, 523]  # C major scale

# Variable to track if the alarm is active
alarm_active = False

# Function to toggle the alarm state
def toggle_alarm():
    global alarm_active
    alarm_active = not alarm_active

# Attach the toggle_alarm function to the button press event
button.when_pressed = toggle_alarm

# Main loop
while True:
    if alarm_active:
        for note in melody:
            speaker.play(note)
            sleep(0.5)
        sleep(1)
    else:
        speaker.off()
        sleep(0.1)  # Small delay to avoid excessive CPU usage