Trinket M0 boards can run CircuitPython — a different approach to programming compared to Arduino sketches. In fact, CircuitPython comes factory pre-loaded on Trinket M0. If you’ve overwritten it with an Arduino sketch, or just want to learn the basics of setting up and using CircuitPython, this is explained in the Adafruit Trinket M0 guide.
Below is CircuitPython code that works similarly (though not exactly the same) as the Arduino sketch shown on a prior page. To use this, plug the Trinket M0 into USB…it should show up on your computer as a small flash drive…then edit the file “code.py” with your text editor of choice. Select and copy the code below and paste it into that file, entirely replacing its contents (don’t mix it in with lingering bits of old code). When you save the file, the code should start running almost immediately (if not, see notes at the bottom of this page).
If Trinket M0 doesn’t show up as a drive, follow the Trinket M0 guide link above to prepare the board for CircuitPython.
# SPDX-FileCopyrightText: 2017 Limor Fried/ladyada for Adafruit Industries
# SPDX-FileCopyrightText: 2018 Mikey Sklar for Adafruit Industries
#
# SPDX-License-Identifier: MIT
import time
import board
import simpleio
import pwmio
import digitalio
# PWM is not available on Trinket D1
vibration_pin = board.D1 # vibration switch is connected
speaker_pin = board.D2 # PWM speaker
pwm_leds = board.D4 # PWM "fading" LEDs
# initialize PWM for LEDs
pwm = pwmio.PWMOut(pwm_leds, frequency=256, duty_cycle=50)
led_fade_delay = .001 # delay in seconds makes color fade visible
led_fade_step = 1024 # fade amount
# initialize vibration sensor
vpin = digitalio.DigitalInOut(vibration_pin)
vpin.direction = digitalio.Direction.INPUT
vpin.pull = digitalio.Pull.UP
def led_fade(brightness):
pwm.duty_cycle = brightness
brightness_start = brightness
while brightness >= (brightness_start / 2):
brightness -= led_fade_step
pwm.duty_cycle = brightness
time.sleep(led_fade_delay)
while True:
# wait for vibration sensor detect (reverse logic)
# play Super Mario Bros. coin sound
# fade LEDs
if not vpin.value:
led_fade((2 ** 16) - 1) # full brightness
simpleio.tone(speaker_pin, 988, 0.083) # tone1 - B5
led_fade(2 ** 15) # half brightness
simpleio.tone(speaker_pin, 1319, 0.83) # tone2 - E6
led_fade(2 ** 14) # quarter brightness
pwm.duty_cycle = 0 # turn off LEDs
The simpleio library must be installed for the above code to run correctly. The latest version of the Adafruit CircuitPython Library Bundle contains this library. You want to download the latest stable mpy bundle which will have a filename like this:
adafruit-circuitpython-bundle-x.x.x-mpy-date.zip
The Trinket M0 has limited space, but so in this case we will be selective about which files are copied over to the CIRCUITPY drive. A detailed explanation for installing libraries is available.
Copy the following file from the unzip'd CircuitPython Library Bundle to the CIRCUITPY drive to a new folder called 'lib'.
- simpleio.mpy
