Python script to create tones every 5, 10 and 30 seconds. Useful for timing stretching exercises.

metronome.py

import os
import time
import math

'''
Note:
Requires the `sox` package, which can be installed with the following command:
	sudo apt-get install sox
'''

def play_tone(duration, frequency):
	os.system("play -nq synth {} sine {}".format(duration, frequency))

'Uncomment to test what a frequency sounds like'
# play_tone(1, 1000)
# exit()

'Uncomment to wait 5 seconds before starting'
play_tone(0.2, 600)
play_tone(0.2, 800)
time.sleep(5-(0.2*2))


def get_freq(t):
	if t % 30 == 0:
		return 1024
	if t % 10 == 0:
		return 512
	if t % 5 == 0:
		return 256
	return 0

tone_duration = 0.8

# Set this value to 0 to make the metronome continue forever
seconds_until_timeout = 10

start_time = time.time()
t = 0
while t < seconds_until_timeout or seconds_until_timeout <= 0:
	#play tone
	freq = get_freq(t)
	if freq != 0:
		play_tone(tone_duration, freq)

	#start next loop next time second hand clicks
	curr_time = time.time() - start_time
	t = math.ceil(curr_time)
	time.sleep(math.ceil(curr_time) - curr_time)


end_time = time.time()
duration = end_time - start_time
percent_error = 100*abs(duration-seconds_until_timeout)/seconds_until_timeout
# print("It took {:.4} seconds when the goal was {}, so {:.4}% error".format(duration, seconds_until_timeout, percent_error))
print("Goal: {} sec | Actual: {:.6} sec | Error: {:.4}%".format(seconds_until_timeout, duration, percent_error))