Once you've finished setting up your Feather M4 Express 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 as a zipped folder.

# SPDX-FileCopyrightText: 2022 Liz Clark for Adafruit Industries
# SPDX-License-Identifier: MIT

from adafruit_crickit import crickit

#  crickit setup
ss = crickit.seesaw
#  pin for photo interrupter
photo = crickit.SIGNAL1
ss.pin_mode(photo, ss.INPUT_PULLUP)

#  dc motor setup
motor = crickit.dc_motor_1

#  party parrot colors for the NeoPixel
parrot_0 = (255, 75, 0)
parrot_1 = (255, 200, 0)
parrot_2 = (90, 255, 90)
parrot_3 = (0, 255, 255)
parrot_4 = (0, 160, 255)
parrot_5 = (90, 0, 255)
parrot_6 = (175, 0, 255)
parrot_7 = (255, 0, 200)
parrot_8 = (255, 0, 125)
parrot_9 = (255, 0, 0)

colors = (parrot_0, parrot_1, parrot_2, parrot_3, parrot_4, parrot_5,
            parrot_6, parrot_7, parrot_8, parrot_9)

#  setup using crickit neopixel library
crickit.init_neopixel(1)
crickit.neopixel.fill((parrot_0))

#  counter for party parrot colors
z = 0
#  speed for the dc motor
speed = 0.3

while True:
    #  begin the dc motor
    #  will run throughout the loop
    motor.throttle = speed
    #  read the input from the photo interrupter
    data = ss.digital_read(photo)

    #  if the photo interrupter detects a break:
    if data is True:
        #  debug print
        print(z)
        #  change the neopixel's color to the z index of the colors array
        crickit.neopixel.fill((colors[z]))
        #  increase z by 1
        z += 1
        #  if z reaches the end of the colors array...
        if z > 9:
            #  index is reset
            z = 0

Upload the Code and Libraries to the Feather M4 Express

After downloading the Project Bundle, plug your Feather M4 Express into the computer's USB port. 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 M4 Express's CIRCUITPY drive. 

  • lib folder
  • code.py

Your Feather M4 Express CIRCUITPY drive should look like this after copying the lib folder and the code.py file.

How the CircuitPython Code Works

The use of the adafruit_crickit library makes this code very straight forward.

First, the Crickit's Seesaw peripheral is setup, followed by the photo interrupter and dc motor's pins.

from adafruit_crickit import crickit

#  crickit setup
ss = crickit.seesaw
#  pin for photo interrupter
photo = crickit.SIGNAL1
ss.pin_mode(photo, ss.INPUT_PULLUP)

#  dc motor setup
motor = crickit.dc_motor_1

Party Colors

Next, the colors for the party parrot are created and inserted into the colors array. These will be accessed in the loop for the NeoPixel.

#  party parrot colors for the NeoPixel
parrot_0 = (255, 75, 0)
parrot_1 = (255, 200, 0)
parrot_2 = (90, 255, 90)
parrot_3 = (0, 255, 255)
parrot_4 = (0, 160, 255)
parrot_5 = (90, 0, 255)
parrot_6 = (175, 0, 255)
parrot_7 = (255, 0, 200)
parrot_8 = (255, 0, 125)
parrot_9 = (255, 0, 0)

colors = (parrot_0, parrot_1, parrot_2, parrot_3, parrot_4, parrot_5,
            parrot_6, parrot_7, parrot_8, parrot_9)

The adafruit_crickit library has its own unique way of setting up NeoPixels when you connect using the NeoPixel terminal on the board.

#  setup using crickit neopixel library
crickit.init_neopixel(1)
crickit.neopixel.fill((parrot_0))

Variables

Finally, two variables are setup, z and speed. z will act as the counter for the NeoPixel's color and speed will affect the speed of the DC motor.

#  counter for party parrot colors
z = 0
#  speed for the dc motor
speed = 0.3

The Loop

The loop begins by starting the DC motor. It will spin throughout the loop. data is also setup to hold the input from the photo interrupter.

#  begin the dc motor
    #  will run throughout the loop
    motor.throttle = speed
    #  read the input from the photo interrupter
    data = ss.digital_read(photo)

The main event is in the for statement. When the photo interrupter detects a break, then the NeoPixel's color is updated to the next color in the colors array. The index value is held by the variable z.

Once z overflows in value for the colors array, it is reset to 0 to loop through the array continuously.

#  if the photo interrupter detects a break:
    if data is True:
        #  debug print
        print(z)
        #  change the neopixel's color to the z index of the colors array
        crickit.neopixel.fill((colors[z]))
        #  increase z by 1
        z += 1
        #  if z reaches the end of the colors array...
        if z > 9:
            #  index is reset
            z = 0

This guide was first published on Feb 14, 2022. It was last updated on 2022-02-14 22:34:34 -0500.

This page (Coding the Party Parrot Zoetrope) was last updated on May 24, 2022.

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