from machine import I2C, Pin, PWM
from time import sleep
import i2c_lcd

# --- Inisialisasi LCD I2C ---
i2c = I2C(0, sda = Pin(21), scl = Pin(22), freq = 400000)
      addr = i2c.scan()[0] if i2c.scan() else 0x27
                 lcd = i2c_lcd.I2cLcd(i2c, addr, 2, 16)

                       from machine import Pin, PWM
                       from time import sleep_ms

# pin buzzer
                       buzzer = PWM(Pin(18))   # ganti dengan pin GPIO yang kamu pakai (misal 9)

# mapping nada (Do = C4)
    notes = {
    'C': 261,
    'D': 294,
    'E': 329,
    'F': 349,
    'G': 392,
    'A': 440,
    'B': 494,
    'c': 523,  # C tinggi
    'd': 587,
    'e': 659,
    'f': 698,
    'g': 784,
    ' ': 0      # spasi = diam
  }

# notasi lagu Rasa Sayange (reff)
melody = "CCDCFE CCDCFE CCcAFED BBAFGF"
         beats  = [4, 4, 4, 4, 8, 4, 4, 4, 4, 4, 4, 4, 4, 8, 4, 4, 4, 4, 4, 4, 4, 4, 8, 4, 4, 4, 4, 4]

                  tempo = 150  # semakin kecil semakin cepat

                          def play(note, duration):
                          if note == ' ':
                            buzzer.duty(0)   # diam
                              sleep_ms(duration)
                          else:
                                buzzer.freq(notes[note])
                                buzzer.duty(512) # aktifkan buzzer (0 - 1023)
                                sleep_ms(duration)
                                buzzer.duty(0)   # matikan buzzer (supaya ada jeda)

# mainkan lagu
                          while True:
                                for i in range(len(melody)) :
                                    play(melody[i], beats[i] * tempo)
                                    sleep_ms(tempo)  # jeda antar nada