GEMMA M0 boards can run CircuitPython — a different approach to programming compared to Arduino sketches. In fact, CircuitPython comes factory pre-loaded on GEMMA 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 GEMMA 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 GEMMA 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 GEMMA M0 doesn’t show up as a drive, follow the GEMMA M0 guide link above to prepare the board for CircuitPython.
# SPDX-FileCopyrightText: 2018 Mikey Sklar for Adafruit Industries
#
# SPDX-License-Identifier: MIT
# Mindfulness Bracelet sketch for Adafruit Gemma. Briefly runs
# vibrating motor (connected through transistor) at regular intervals.
import time
import board
from digitalio import DigitalInOut, Direction
# vibrating disc mini motor disc connected on D1
vibrating_disc = DigitalInOut(board.D1)
vibrating_disc.direction = Direction.OUTPUT
on_time = 2 # Vibration motor run time, in seconds
interval = 60 # Time between reminders, in seconds
start_time = time.monotonic()
while True:
timer = time.monotonic() - start_time
if timer >= interval and timer <= (interval + on_time):
vibrating_disc.value = True
elif timer >= (interval + on_time):
vibrating_disc.value = False
start_time = time.monotonic()
