Metro M4 Express
Use jumper wires to connect A1 and any one of the GND
to different legs on the piezo.
To use A1, comment out the current pin setup line, and
uncomment the line labeled for the M4 boards. See the
details above!
Metro M4 Express has PWM on: A1, A5, D0, RX, D1, TX,
D2, D3, D4, D5, D6, D7, D8, D9, D10, D11, D12, D13, SDA,
SCK, MOSI, MISO
There is No PWM on: A0, A2, A3, A4, SCL, AREF,
NEOPIXEL, LED_RX, LED_TX.
Where's My PWM?
Want to check to see which pins have PWM yourself? We've written this handy script! It attempts to setup PWM on
every pin available, and lets you know which ones work and which ones don't. Check it out!
import board
import pulseio
for pin_name in dir(board):
pin = getattr(board, pin_name)
try:
p = pulseio.PWMOut(pin)
p.deinit()
print("PWM on:", pin_name) # Prints the valid, PWM-capable pins!
except ValueError: # This is the error returned when the pin is invalid.
print("No PWM on:", pin_name) # Prints the invalid pins.
except RuntimeError: # Timer conflict error.
print("Timers in use:", pin_name) # Prints the timer conflict pins.
except TypeError: # Error returned when checking a non-pin object in dir(board).
pass # Passes over non-pin objects in dir(board).
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