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https://github.com/dhylands/upy-rtttl
Python Parser for Ring Tone Text Transfer Language (RTTTL)
https://github.com/dhylands/upy-rtttl
Last synced: 11 days ago
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Python Parser for Ring Tone Text Transfer Language (RTTTL)
- Host: GitHub
- URL: https://github.com/dhylands/upy-rtttl
- Owner: dhylands
- License: mit
- Created: 2016-07-24T02:22:40.000Z (over 8 years ago)
- Default Branch: master
- Last Pushed: 2021-02-22T20:23:02.000Z (over 3 years ago)
- Last Synced: 2024-10-12T05:25:06.087Z (27 days ago)
- Language: Python
- Size: 18.6 KB
- Stars: 37
- Watchers: 7
- Forks: 10
- Open Issues: 2
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
- awesome-micropython - upy-rtttl - Python Parser for Ring Tone Text Transfer Language (RTTTL). (Libraries / Audio)
README
Ring Tone Text Transfer Language Parser
=======================================
This library can parse RTTTL text lines and delivers the frequency and duration
for each note.
A typical RTTTL string looks like this:
```
Entertainer:d=4,o=5,b=140:8d,8d#,8e,c6,8e,c6,8e,2c.6,8c6,8d6,8d#6,8e6,8c6,8d6,e6,8b,d6,2c6,p,8d,8d#,8e,c6,8e,c6,8e,2c.6,8p,8a,8g,8f#,8a,8c6,e6,8d6,8c6,8a,2d6
```
You can find many more sample ring tones here: http://www.picaxe.com/RTTTL-Ringtones-for-Tune-Command/
You can find a description of RTTTL here: https://en.wikipedia.org/wiki/Ring_Tone_Transfer_Language
# Using RTTTL on the pyboard
Instantiate an instance of the RTTTL class, passing in the tune string to the
constructor.
```python
tune = RTTTL('Entertainer:d=4,o=5,b=140:8d,8d#,8e,c6,8e,c6,8e,2c.6,8c6,8d6,8d#6,8e6,8c6,8d6,e6,8b,d6,2c6,p,8d,8d#,8e,c6,8e,c6,8e,2c.6,8p,8a,8g,8f#,8a,8c6,e6,8d6,8c6,8a,2d6')
```
Then use the notes generator to enumerate the notes in the tune. The notes
generator will return a tuple, where the first entry in the tuple contains
the frequency of the note (in Hz) and the second entry in the tuple contains
the duration of the note.
```python
for freq, msec in tune.notes():
play_tone(freq, msec)
```
When using a piezo you basically provide a 50% PWM signal to the piezo using the frequency of the note. Some piezo speakers can vary the volume by using a different duty cycle. The piezo on the G30DEV board Dave Hylands this on, it didn't seem to make any difference.
In order to distinguish consecutive notes, you need a small gap between the notes.
Dave Hylands chose to use 90% of the duration to play the tone, and 10% of duration to play silence.
Dave Hylands used the following play_tone routine on the G30DEV board:
```python
import pyb
buz_tim = pyb.Timer(3, freq=440)
buz_ch = buz_tim.channel(1, pyb.Timer.PWM, pin=pyb.Pin.board.BUZZER, pulse_width=0)
def play_tone(freq, msec):
print('freq = {:6.1f} msec = {:6.1f}'.format(freq, msec))
if freq > 0:
buz_tim.freq(freq)
buz_ch.pulse_width_percent(50)
pyb.delay(int(msec * 0.9))
buz_ch.pulse_width_percent(0)
pyb.delay(int(msec * 0.1))
```
Dave Hylands put a recording of the above on YouTube: https://youtu.be/TadV2AEvfww
The G30DEV board definition files for MicroPython can be found here: https://github.com/dhylands/G30DEV
When using pin Y2 on a pyboard v1.0, change the timer/pin to:
```python
buz_tim = pyb.Timer(8, freq=440)
buz_ch = buz_tim.channel(2, pyb.Timer.PWM, pin=pyb.Pin('Y2'), pulse_width=0)
```
To see which timers are available on which pins, consult the MicroPython quickref:
http://docs.micropython.org/en/latest/pyboard/pyboard/quickref.html
David Glaude used the following play_tone routine on Circuit Python M0 board:
```
import board
import pulseio
import time
speaker_pin = board.D0 # Speaker is connected to this DIGITAL pin
# Initialize input/output pins
pwm = pulseio.PWMOut(speaker_pin, variable_frequency=True, duty_cycle=0)
def play_tone(freq, msec):
# print('freq = {:6.1f} msec = {:6.1f}'.format(freq, msec))
if freq > 0:
pwm.frequency = int(freq) # Set frequency
pwm.duty_cycle = 32767 # 50% duty cycle
time.sleep(msec*0.001) # Play for a number of msec
pwm.duty_cycle = 0 # Stop playing
time.sleep(0.05) # Delay 50 ms between notes
```
Files:
- circuit_test.py: Playing RTTTL on M0 Circuit Python board.
- pc_test.py: Printing RTTTL decoding on any platform (no sound produced).
- pyb_test.py: Playing RTTTL on G30DEV board.
- rtttl.py: RTTTL decoding library.
- songs.py: Optionnal collection of RTTTL songs to test the library.