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To use with the Metro M4 Express, ItsyBitsy M4 Express or the Feather M4 Express, you must comment out the

piezo = pulseio.PWMOut(board.A2, duty_cycle=0, frequency=440, variable_frequency=True) line and uncomment

the piezo = pulseio.PWMOut(board.A1, duty_cycle=0, frequency=440, variable_frequency=True) line. A2 is not a

supported PWM pin on the M4 boards!

If you have simpleio library loaded into your /lib folder on your board, we have a nice little helper that makes a tone

for you on a piezo with a single command.

To use with any of the M0 boards, no changes to the following code are needed.

To use with the Metro M4 Express, ItsyBitsy M4 Express or the Feather M4 Express, you must comment out the

simpleio.tone(board.A2, f, 0.25) line and uncomment the simpleio.tone(board.A1, f, 0.25) line. A2 is not a

supported PWM pin on the M4 boards!

As you can see, it's much simpler!

Remember: To "comment out" a line, put a # and a space before it. To "uncomment" a line, remove the # +

space from the beginning of the line.



import time

import board

import pulseio

# For the M0 boards:

piezo = pulseio.PWMOut(board.A2, duty_cycle=0, frequency=440, variable_frequency=True)

# For the M4 boards:

# piezo = pulseio.PWMOut(board.A1, duty_cycle=0, frequency=440, variable_frequency=True)

while True:

for f in (262, 294, 330, 349, 392, 440, 494, 523):

piezo.frequency = f

piezo.duty_cycle = 65536 // 2 # On 50%

time.sleep(0.25) # On for 1/4 second

piezo.duty_cycle = 0 # Off

time.sleep(0.05) # Pause between notes

time.sleep(0.5)

import time

import board

import simpleio

while True:

for f in (262, 294, 330, 349, 392, 440, 494, 523):

# For the M0 boards:

simpleio.tone(board.A2, f, 0.25) # on for 1/4 second

# For the M4 boards:

# simpleio.tone(board.A1, f, 0.25) # on for 1/4 second

time.sleep(0.05) # pause between notes

time.sleep(0.5)

Adafruit Feather M4 Express User Manual

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