Simple script to capture

simple_paino.py

"""
Simple script to turn the keyboard into a basic piano.

Install dependancies with:
$ pip install pynput pysinewave

$ sudo apt install libportaudio2

This script has the bonus "feature" to listen the entire keyboard input, so
when it's running, when typing outside of the terminal it will still play
sounds.

"""


DIRECTIONS = """
Simple piano.  Press and/or hold keys on the home row to make a tone.

Middle C at H.

Supports sharp keys.  For example, Press "shift c" to play C#

Press q to quit

"""

print(DIRECTIONS)


import time

from pynput.keyboard import Key, Listener
from pysinewave import SineWave


char_to_pitch = {
    'a': -5,
    'A': -4.5,
    's': -4,
    'S': -3.5,
    'd': -3,
    'D': -2.5,
    'f': -2,
    'F': -1.5,
    'g': -1,
    'G': -0.5,
    'h': 0,
    'H': 0.5,
    'j': 1,
    'J': 1.5,
    'k': 2,
    'K': 2.5,
    'l': 3,
    'L': 3.5,
    ';': 4,
    ':': 4.5,
    "'": 5,
    '"': 5.5,
}               


sinewave = SineWave(pitch_per_second=1000000)

def on_press(key):
    if hasattr(key, 'char'):
        char = key.char
        if char in char_to_pitch:

            pitch = char_to_pitch[char]
            sinewave.set_pitch(pitch)
            sinewave.play()


def on_release(key):
    if hasattr(key, 'char'):
        char = key.char
        sinewave.stop()
        if char == 'q':
            print('quitting')
            return False


# Collect events until released
with Listener(on_press=on_press, on_release=on_release, supress=True) as listener:
    listener.join()