Cytron Maker Pi Pico Demo

The Cytron Maker Pi Pico carrier accepts a standard Raspberry Pi Pico and adds buttons, LEDS, speaker, audio jack, SD card slot, Grove connectors, and a WiFi module socket. It doesn’t include the Pi Pico itself.

Blink All

The board includes indicator LEDs on all the available GPIO pins in addition to a single color NeoPixel.

# blink_all.py

# Demo for the Cytron Maker Pi Pico with Raspberry Pi Pico installed.
# Blink all the available LEDs.

import board
import time

# load the CircuitPython GPIO support
from digitalio import DigitalInOut, Direction, Pull

# load the low-level CircuitPython NeoPixel support
from neopixel_write import neopixel_write

#---------------------------------------------------------------
# list of all the blue indicator LED pins in pin order
indicator_pins = [
    # left side, top to bottom
    board.GP0, board.GP1,
    board.GP2, board.GP3, board.GP4, board.GP5,
    board.GP6, board.GP7, board.GP8, board.GP9,
    board.GP10, board.GP11, board.GP12, board.GP13,
    board.GP14, board.GP15,

    # right side, bottom to top
    board.GP16, board.GP17,
    board.GP18, board.GP19, board.GP20, board.GP21,
    board.GP22,
    board.GP26, board.GP27,
    # board.GP28, this indicator LED is shared with the NeoPixel
    ]

# the NeoPixel in on GP28
neopixel = DigitalInOut(board.GP28)
neopixel.direction = Direction.OUTPUT

# the LED on board the Pico is GP25
Pico_LED_pin = board.LED

#---------------------------------------------------------------
# Create a list of output devices to flash in order.
outputs = [DigitalInOut(pin) for pin in indicator_pins]
outputs.append(DigitalInOut(Pico_LED_pin))

# and set them all to output
for io in outputs:
    io.direction = Direction.OUTPUT

#---------------------------------------------------------------

# run forever
while True:
    # sequence the LEDs on and off
    print("strobing LEDs")
    for io in outputs:
        io.value = True
        time.sleep(0.05)
        io.value = False

    # cycle through colors on the NeoPixel: green, red, blue, off
    for color in ((255, 0, 0), (0, 255, 0), (0, 0, 255), (0, 0, 0)):
        print("neopixel color:", color)
        neopixel_write(neopixel, bytearray(color))
        time.sleep(0.25)

Play Tones

This demo uses the tones.py module from Music and Rhythm Examples - CircuitPython to generate musical tones on the buzzer. To try it, please copy the tones.py file to the top level of the CIRCUITPY drive, then copy the code below into code.py on CIRCUITPY.

# play_tones.py

# Demo for the Cytron Maker Pi Pico with Raspberry Pi Pico installed.
# Play a melody on the buzzer.

# This uses the tones module from the music/ folder of the course sample code.
# The tones.py file should be copied to the top level of the CIRCUITPY drive.

import board
import time

# load the speaker driver module
import tones

#---------------------------------------------------------------
# create an I/O object for the buzzer on GP18
speaker = tones.ToneSpeaker(board.GP18)

#---------------------------------------------------------------
# run forever
while True:
    # play a major C scale up and down
    for note in [60, 62, 64, 65, 67, 69, 71, 72, 71, 69, 67, 65, 64, 62, 60]:
        speaker.midi_tone(note)
        time.sleep(0.125)

    speaker.noTone()
    time.sleep(2.0)