Arete Workshop code examples

hello.py

# The machine library contains functions you can use control the Pico hardware.
# In this example program, we're using the Pin class to configure and control
# the GPIO pins.
from machine import Pin

# The utime library contains functions that allow us to read the current time
# and to delay (aka 'sleep') for seconds, milliseconds, or microseconds.
import utime

# main runs until stopped, blinking the Pico built-in LED at 1 second intervals.
def main():
    # The picoLED is GPIO #25.  Before using it we need to configure it for output.
    picoLed = Pin(25, Pin.OUT)

    # Print a message to the console
    print("Hello")

    # Enclose the loop in a try/finally clause to allow for clean-up actions
    # when the program is stopped.
    try:
        # A while True loop runs forever.
        while True:
            picoLed.high()        # LED on
            utime.sleep_ms(1000)  # Wait 1 second
            picoLed.low()         # LED off
            utime.sleep_ms(1000)  # Wait 1 second
    finally:
        # Clean up. Ensure the LED is turned off when we exit.
        picoLed.low()


# Invoke main when the program is loaded
main()

leds.py

# The machine library contains functions you can use control the Pico hardware.
# In this example program, we're using the Pin class to configure and control
# the GPIO pins.
from machine import Pin

# The utime library contains functions that allow us to read the current time
# and to delay (aka 'sleep') for seconds, milliseconds, or microseconds.
import utime

# main runs until stopped, blinking 3 LEDS in sequence.
def main():
    # Note that the pin numbers on the printed on the Pico board are NOT
    # the same as the GPIO numbers needed by the Pin function. Use the
    # Pico pinout diagram at https://datasheets.raspberrypi.com/pico/Pico-R3-A4-Pinout.pdf
    # to see which GPIO pin goes with which physical pin.
    led14 = Pin(14, Pin.OUT) # Pico pin 19
    led15 = Pin(15, Pin.OUT) # Pico pin 20
    led16 = Pin(16, Pin.OUT) # Pico pin 21

    # Print a message to the console
    print("Look Ma, 3 LEDS at a time!")

    # Make a list we can used to control the LEDs in sequence
    ledList = [led14, led15, led16]

    # Each led will blink quickly (20 milliseconds) and the sleep for a longer time
    # (380 ms). The timing is arbitrary, I like the effect better than equal on/off times.
    onMs = 20
    offMs = 380

    # Enclose the loop in a try/finally clause to allow for clean-up actions
    # when the program is stopped.
    try:
        # A while True loop runs forever.
        while True:
            # blink each led in sequence
            for led in ledList:
                led.on()        # LED on
                utime.sleep_ms(onMs)  # Wait 1 second
                led.off()        # LED off
                utime.sleep_ms(offMs)  # Wait 1 second
    finally:
        # Clean up. Ensure the each LED is turned off when we exit.
        for led in ledList:
            led.off()


# Invoke main when the program is loaded
main()