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: 2018 Mikey Sklar for Adafruit Industries # # SPDX-License-Identifier: MIT import time import analogio import board import simpleio from digitalio import DigitalInOut, Direction # setup photocell photocell = analogio.AnalogIn(board.A1) # analog #1 same pin as Digital #2 darkness_min = (2 ** 16) * .05 # light level < 5% means darkness # setup speaker speaker = DigitalInOut(board.D1) speaker.direction = Direction.OUTPUT # setup servo servo = simpleio.Servo(board.D0) # servo motor angle = 0 def chirp(): for i in range(200,180,-1): play_tone(i,9) def play_tone(tone_value, duration): microseconds = 10 ** 6 # duration divider, convert to microseconds for i in range(0, duration): i += tone_value * 2 speaker.value = True time.sleep(tone_value / microseconds) speaker.value = False time.sleep(tone_value / microseconds) # loop forever... while True: # when photocell goes dark (less than 5%) # turn on audio # rotate stepper if photocell.value < darkness_min: chirp() # bird chirp noise if servo.angle == 0: servo.angle = 180 # rotate bird head 180 degrees else: servo.angle = 0 time.sleep(.5) # leave some time to complete rotation
The simpleio.mpy library must be installed for the above code to run correctly. The latest version of the Adafruit CircuitPython Library Bundle contains both libraries. 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
Page last edited January 22, 2025
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