130 lines
3.1 KiB
Python
130 lines
3.1 KiB
Python
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# SPDX-License-Identifier: MIT
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#
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# Little christmas candle
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#
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# Author: Nils Freydank <nils.freydank@datenschutz-ist-voll-doof.de>
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# Year: 2022
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# Copyright: MIT
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import json
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import machine
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import time
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pin_piezo = machine.Pin(12)
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def _note_to_freq(note_name: str) -> int:
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"""
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Translate note names from strings into frequency values.
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"""
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freq: int = 0
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# frequencies, see e.g.
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# https://en.wikipedia.org/wiki/Piano_key_frequencies
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note_names: dict = {
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"c4": 262,
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"cis4": 277,
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"d4": 294,
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"e4": 330,
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"f4": 349,
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"fis4": 370,
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"g4": 392,
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"a4": 440,
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"b4": 466,
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"h4": 494,
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"c5": 523,
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"cis5": 554,
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"d5": 587,
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"e5": 659,
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"f5": 698,
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"fis5": 740,
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"g5": 784,
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"a5": 880,
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"b5": 923,
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"h5": 988,
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"c6": 1047,
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}
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try:
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freq = note_names[note_name]
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except KeyError:
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freq = -1
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print(f"exc in _note_to_freq() for {note_name}.")
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return freq
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def _len_to_second(len_name: str, len_scaling: float = 0.6) -> float:
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time: float = 0.0
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len_names = {
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"_t": 0.125 * len_scaling, # thirty-second note or pause
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"_s": 0.25 * len_scaling, # sixteenth note or pause
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"_e": 0.5 * len_scaling, # eight note or pause
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"_q": 1.0 * len_scaling, # quarter note or pause
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"_h": 2.0 * len_scaling, # half note or pause
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"_f": 4.0 * len_scaling, # whole note or pause
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}
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try:
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for elem in len_name.split("+"):
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time += len_names[elem.replace(" ", "")]
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except KeyError:
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time = 0.0
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print(f"exc in _len_to_second() for {elem}.")
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print("Do you have a typo there, e.g. 'a' + 'b' instead of 'a + b'?")
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return time
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def play_note(note_name: str, duration: str, loud: bool = False) -> int:
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if loud:
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duty_cycle: int = 16_000
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else:
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duty_cycle: int = 400
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real_pwm_freq: int = 0
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pwm_piezo = machine.PWM(pin_piezo)
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pwm_piezo.freq(_note_to_freq(note_name))
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real_pwm_freq = pwm_piezo.freq()
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pwm_piezo.duty_u16(duty_cycle)
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time.sleep(_len_to_second(duration))
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pwm_piezo.duty_u16(0)
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time.sleep(0.05)
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return real_pwm_freq
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def pause(duration: str) -> None:
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time.sleep(_len_to_second(duration))
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time.sleep(0.05)
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def play_music(file_name: str = "o-tannenbaum.json") -> None:
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data: dict = {}
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try:
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with open(file_name, "r") as f:
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data = json.load(f)
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try:
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if data["metadata"]["format"] == "json-0.1.0":
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for notes in data["music"]:
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for note in notes.keys():
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if note == "0":
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pause(notes[note])
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else:
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play_note(note, notes[note])
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elif data["metadata"]["format"] == "json-0.2.0":
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pass
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except:
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print(f"play_oh_tannnebaum() failed to parse {data}.")
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except FileNotFoundError:
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print("Could not load the JSON file containing the song's details.")
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# vim:fileencoding=utf-8:ts=4:syntax=python:expandtab
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