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Merged
merged 2 commits into from
Oct 16, 2018
Merged

Update piano example #10

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0e20f6d
update piano example
caternuson Oct 16, 2018
b16425e
remove time import
caternuson Oct 16, 2018
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42 changes: 15 additions & 27 deletions examples/piano.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3,7 +3,7 @@
# when an input is touched. Note only one note is played at a time!
# For use with microcontrollers or computers with PWM support only!
# Author: Tony DiCola
import time
# Modified by: Carter Nelson

import board
import busio
Expand Down Expand Up @@ -43,31 +43,19 @@
buzzer = pulseio.PWMOut(BUZZER_PIN, duty_cycle=TONE_OFF_DUTY, frequency=440,
variable_frequency=True)

# Main loop.
# First grab an initial touch state for all of the inputs. The touched()
# function can quickly get the state of all input pins and returns them as a
# 12-bit value with a bit set to 1 for each appropriate input (i.e. bit 0 is
# input 0, bit 1 is input 1, etc.)
last = mpr121.touched()
last_note = None
while True:
# Every loop iteration get an updated touch state and look to see if it
# changed since the last iteration.
current = mpr121.touched()
if last != current:
# Some pin changed, turn off playback and look for any touched pins.
# Get touched state for all pins
touched = mpr121.touched_pins
# If no pins are touched, be quiet
if True not in touched:
last_note = None
buzzer.duty_cycle = TONE_OFF_DUTY
# Loop through all 12 inputs (0-11) and look at their bits in the
# current touch state. A bit that's set is touched!
for i in range(12):
if (1 << i) & current > 0:
print('Input {} touched!'.format(i))
# Grab the frequency for the associated pin and check that it's
# not zero (unused).
freq = NOTE_FREQS[i]
if freq != 0:
# Pin with a specified frequency was touched, play the tone!
buzzer.frequency = NOTE_FREQS[i]
buzzer.duty_cycle = TONE_ON_DUTY
# Update touch state and delay a bit before next loop iteration.
last = current
time.sleep(0.01)
continue
# Get index of touched pin
note = touched.index(True)
# Play note if pin is different and has a defined note
if note != last_note and NOTE_FREQS[note] != 0:
last_note = note
buzzer.frequency = NOTE_FREQS[note]
buzzer.duty_cycle = TONE_ON_DUTY