Here's the Pro version of the nightlight. Instead of being limited to the plain green color at one intensity, you can change the colors and brightness of the RGB LED using the capacitive touch pads on the Gemma M0. Pads D0 and D2 on one side lower and raise the brightness, and D1 on the other side changes the color. You can tap the pads or hold them down. If you don't like the colors or the brightness range or steps in the program below, feel free to change them.
You need just one library, adafruit_dotstar. It's included in the Project Bundle you can download below.
Copy the program below, and save it as code.py on your CIRCUITPY drive.
# SPDX-FileCopyrightText: 2018 Dan Halbert for Adafruit Industries
#
# SPDX-License-Identifier: MIT
import time
import board
import touchio
import adafruit_dotstar
# Red, green, blue, and simple mixes of 2 or 3.
# Add your own choices here.
COLORS = (
(0, 255, 0),
(0, 0, 255),
(255, 0, 0),
(0, 255, 255),
(255, 255, 0),
(255, 0, 255),
(255, 255, 255),
)
# The two left touch pads adjust the brightness.
# The right touch pad changes colors.
# Hold down or just tap.
brightness_down = touchio.TouchIn(board.D0)
brightness_up = touchio.TouchIn(board.D2)
change_color = touchio.TouchIn(board.D1)
dotstar = adafruit_dotstar.DotStar(board.APA102_SCK, board.APA102_MOSI, 1)
BRIGHTNESS_STEPS = 15
# Start at medium brightness, green.
brightness_step = 8
color_index = 0
while True:
if brightness_down.value:
# Don't go below 1.
brightness_step = max(1, brightness_step - 1)
if brightness_up.value:
# Don't go above BRIGHTNESS_STEPS.
brightness_step = min(BRIGHTNESS_STEPS, brightness_step + 1)
if change_color.value:
# Cycle through 0 to len(COLORS)-1 and then wrap around.
color_index = (color_index + 1) % len(COLORS)
# Scale brightness to be 0.0 - 1.0.
dotstar.brightness = brightness_step / BRIGHTNESS_STEPS
dotstar.fill(COLORS[color_index])
time.sleep(0.2)
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