Firefly Simulator for Pi Pico in Circuit Python

code.py

# Pi Pico Firefly Simulator
# By Spike Snell 2022

# Import what we need to run the onboard led
import time, board, pwmio, random, microcontroller

# Create a pseudorandom frequency
freq = random.randint(2000,200000)

# Set up the onboard led
led = pwmio.PWMOut(board.LED, frequency=freq, duty_cycle=0)

# Loop 100 times
for i in range(100):

    # Ramp the brightness up somewhat quickly 
    for b in range(6553):       
      
       # Set the led brightness
       led.duty_cycle = b * 10

    # Fade the led out more slowly
    for f in range(65535):

       # Set the led brightness
       led.duty_cycle = 65535 - f

    # Sleep for an amount of time between 3 to 14 seconds
    time.sleep(random.randint(3,14))

# Reset the board to start emulate a new bug cycle  
microcontroller.reset()