Once you've finished setting up your Feather RP2040 with CircuitPython, you can access the code and necessary libraries by downloading the Project Bundle.
To do this, click on the Download Project Bundle button in the window below. It will download to your computer as a zipped folder.
# SPDX-FileCopyrightText: 2023 Liz Clark for Adafruit Industries
# SPDX-License-Identifier: MIT
import time
import random
import board
import neopixel
from adafruit_seesaw import seesaw, rotaryio, digitalio
from adafruit_debouncer import Button
from rainbowio import colorwheel
from adafruit_led_animation import color
# NeoPixel ring setup. Update num_pixels if using a different ring.
num_pixels = 24
pixels = neopixel.NeoPixel(board.D5, num_pixels, auto_write=False)
i2c = board.STEMMA_I2C()
seesaw = seesaw.Seesaw(i2c, addr=0x49)
buttons = []
for b in range(1, 6):
seesaw.pin_mode(b, seesaw.INPUT_PULLUP)
ss_pin = digitalio.DigitalIO(seesaw, b)
button = Button(ss_pin, long_duration_ms=1000)
buttons.append(button)
encoder = rotaryio.IncrementalEncoder(seesaw)
last_position = 0
button_names = ["Select", "Up", "Left", "Down", "Right"]
colors = [color.RED, color.YELLOW, color.ORANGE, color.GREEN,
color.TEAL, color.CYAN, color.BLUE, color.PURPLE, color.MAGENTA]
# rainbow cycle function
def rainbow_cycle(wait):
for j in range(255):
for i in range(num_pixels):
rc_index = (i * 256 // num_pixels) + j
pixels[i] = colorwheel(rc_index & 255)
pixels.show()
time.sleep(wait)
color_index = 0
game_mode = False
pixel = 0
num = 0
last_num = 0
now_color = 0
next_color = 1
speed = 0.1
level = 0.005
final_level = 0.001
new_target = True
while True:
if not game_mode:
for b in range(5):
buttons[b].update()
if buttons[b].released or buttons[b].pressed:
pixels.fill(color.BLACK)
position = encoder.position
if position != last_position:
pixels[last_position % num_pixels] = color.BLACK
pixels[position % num_pixels] = colors[color_index]
# print("Position: {}".format(position))
last_position = position
if buttons[0].pressed:
# print("Center button!")
pixels.fill(colors[color_index])
elif buttons[0].long_press:
# print("long press detected")
pixels.fill(color.BLACK)
new_target = True
game_mode = True
if buttons[1].pressed:
# print("Up button!")
color_index = (color_index + 1) % len(colors)
pixels[10] = colors[color_index]
if buttons[2].pressed:
# print("Left button!")
color_index = (color_index + 1) % len(colors)
pixels[4] = colors[color_index]
if buttons[3].pressed:
# print("Down button!")
color_index = (color_index - 1) % len(colors)
pixels[22] = colors[color_index]
if buttons[4].pressed:
# print("Right button!")
color_index = (color_index - 1) % len(colors)
pixels[16] = colors[color_index]
pixels.show()
if game_mode:
buttons[0].update()
if buttons[0].long_press:
# print("long press detected")
pixels.fill(color.BLACK)
pixels.show()
game_mode = False
pixels.fill(colors[color_index])
# if new level starting..
if new_target:
if buttons[0].released:
# randomize target location
y = random.randint(5, 22)
x = y - 1
z = y + 1
new_target = False
pixels[x] = color.WHITE
pixels[y] = colors[next_color]
pixels[z] = color.WHITE
else:
# delay without time.sleep()
if (pixel + speed) < time.monotonic():
# turn off pixel behind chaser
if num > 0:
last_num = num - 1
pixels[last_num] = color.BLACK
pixels.show()
# keep target pixels their colors when the chaser passes
if last_num in (x, y, z):
pixels[x] = color.WHITE
pixels[y] = colors[next_color]
pixels[z] = color.WHITE
# move chaser pixel by one
if num < num_pixels:
pixels[num] = colors[now_color]
pixels.show()
num += 1
# send chaser back to the beginning of the circle
if num == num_pixels:
last_num = num - 1
pixels[last_num] = color.BLACK
pixels.show()
num = 0
# if the chaser hits the target...
if last_num in [x, y, z] and not buttons[0].value:
# fills with the next color
pixels.fill(colors[next_color])
pixels.show()
# chaser resets
num = 0
time.sleep(0.5)
pixels.fill(color.BLACK)
pixels.show()
# speed increases for next level
speed = speed - level
# color updates
next_color = (next_color + 1) % 9
now_color = (now_color + 1) % 9
# setup for new target
new_target = True
# if the chaser misses the target...
if last_num not in [x, y, z] and not buttons[0].value:
# fills with current chaser color
pixels.fill(color.BLACK)
pixels.show()
# chaser is reset
num = 0
# speed is reset to default
speed = 0.1
# colors are reset
next_color = 1
now_color = 0
# setup for new target
new_target = True
# when you have beaten all the levels...
if speed < final_level:
# rainbows!
rainbow_cycle(0.01)
time.sleep(1)
# chaser is reset
num = 0
pixels.fill(color.BLACK)
pixels.show()
# speed is reset to default
speed = 0.1
# colors are reset
next_color = 1
now_color = 0
# setup for new target
new_target = True
# time.monotonic() is reset for the delay
pixel = time.monotonic()
Upload the Code and Libraries to the Feather RP2040
After downloading the Project Bundle, plug your Feather RP2040 into the computer's USB port with a known good USB data+power cable. You should see a new flash drive appear in the computer's File Explorer or Finder (depending on your operating system) called CIRCUITPY. Unzip the folder and copy the following items to the Feather RP2040's CIRCUITPY drive.
- lib folder
- code.py
Your Feather RP2040 CIRCUITPY drive should look like this after copying the lib folder and the code.py file.
How the CircuitPython Code Works
The code begins by setting up the NeoPixel ring and the ANO rotary encoder. The rotary encoder uses a seesaw chip to communicate over I2C. The five buttons are created as Button objects from the adafruit_debouncer library.
# NeoPixel ring setup. Update num_pixels if using a different ring.
num_pixels = 24
pixels = neopixel.NeoPixel(board.D5, num_pixels, auto_write=False)
i2c = board.STEMMA_I2C()
seesaw = seesaw.Seesaw(i2c, addr=0x49)
buttons = []
for b in range(1, 6):
seesaw.pin_mode(b, seesaw.INPUT_PULLUP)
ss_pin = digitalio.DigitalIO(seesaw, b)
button = Button(ss_pin, long_duration_ms=1000)
buttons.append(button)
encoder = rotaryio.IncrementalEncoder(seesaw)
last_position = 0
colors = [color.RED, color.YELLOW, color.ORANGE, color.GREEN,
color.TEAL, color.CYAN, color.BLUE, color.PURPLE, color.MAGENTA]
The Loop
The state of game_mode determines what functionality is active in the loop. If game_mode is False, then the fidget acts as a fidget toy. When you press any of the arrow buttons, the NeoPixel color changes by either increasing or decreasing the color_index value. If you spin the rotary encoder, a single pixel will move around the ring. If you press the center button, the entire ring will light up. If you hold the center button down for a full second or longer, a long_press is detected and game_mode changes to True.
if not game_mode:
for b in range(5):
buttons[b].update()
if buttons[b].released or buttons[b].pressed:
pixels.fill(color.BLACK)
position = encoder.position
if position != last_position:
pixels[last_position % num_pixels] = color.BLACK
pixels[position % num_pixels] = colors[color_index]
# print("Position: {}".format(position))
last_position = position
if buttons[0].pressed:
# print("Center button!")
pixels.fill(colors[color_index])
elif buttons[0].long_press:
# print("long press detected")
pixels.fill(color.BLACK)
new_target = True
game_mode = True
if buttons[1].pressed:
# print("Up button!")
color_index = (color_index + 1) % len(colors)
pixels[10] = colors[color_index]
if buttons[2].pressed:
# print("Left button!")
color_index = (color_index + 1) % len(colors)
pixels[4] = colors[color_index]
if buttons[3].pressed:
# print("Down button!")
color_index = (color_index - 1) % len(colors)
pixels[22] = colors[color_index]
if buttons[4].pressed:
# print("Right button!")
color_index = (color_index - 1) % len(colors)
pixels[16] = colors[color_index]
pixels.show()
When game_mode is True, a modified version of the NeoPixel chase game begins.
The goal is to press the center button when the moving NeoPixel lands on the target pixels. The target pixels are placed randomly so it’s different for each level. The game advances and speeds up as you score and hit the targets. The running pixel changes color as you level up and goes in the order of ROYGBIV. If you miss a target, the game starts over.
To change game_mode to False, you can hold down the center button for a long_press to return to the fidget toy mode.
if game_mode:
buttons[0].update()
if buttons[0].long_press:
# print("long press detected")
pixels.fill(color.BLACK)
pixels.show()
game_mode = False
pixels.fill(colors[color_index])
# if new level starting..
if new_target:
if buttons[0].released:
# randomize target location
y = random.randint(5, 22)
x = y - 1
z = y + 1
new_target = False
pixels[x] = color.WHITE
pixels[y] = colors[next_color]
pixels[z] = color.WHITE
else:
# delay without time.sleep()
if (pixel + speed) < time.monotonic():
# turn off pixel behind chaser
if num > 0:
last_num = num - 1
pixels[last_num] = color.BLACK
pixels.show()
# keep target pixels their colors when the chaser passes
if last_num in (x, y, z):
pixels[x] = color.WHITE
pixels[y] = colors[next_color]
pixels[z] = color.WHITE
# move chaser pixel by one
if num < num_pixels:
pixels[num] = colors[now_color]
pixels.show()
num += 1
# send chaser back to the beginning of the circle
if num == num_pixels:
last_num = num - 1
pixels[last_num] = color.BLACK
pixels.show()
num = 0
# if the chaser hits the target...
if last_num in [x, y, z] and not buttons[0].value:
# fills with the next color
pixels.fill(colors[next_color])
pixels.show()
# chaser resets
num = 0
time.sleep(0.5)
pixels.fill(color.BLACK)
pixels.show()
# speed increases for next level
speed = speed - level
# color updates
next_color = (next_color + 1) % 9
now_color = (now_color + 1) % 9
# setup for new target
new_target = True
# if the chaser misses the target...
if last_num not in [x, y, z] and not buttons[0].value:
# fills with current chaser color
pixels.fill(color.BLACK)
pixels.show()
# chaser is reset
num = 0
# speed is reset to default
speed = 0.1
# colors are reset
next_color = 1
now_color = 0
# setup for new target
new_target = True
# when you have beaten all the levels...
if speed < final_level:
# rainbows!
rainbow_cycle(0.01)
time.sleep(1)
# chaser is reset
num = 0
pixels.fill(color.BLACK)
pixels.show()
# speed is reset to default
speed = 0.1
# colors are reset
next_color = 1
now_color = 0
# setup for new target
new_target = True
# time.monotonic() is reset for the delay
pixel = time.monotonic()
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