simple asyncio demo of two LEDs using global variables

asyncio_led_demo.py

# simple asyncio demo of two LEDs using global variables
# 8 May 2025 - @todbot
import asyncio
import board
import digitalio

ledA = digitalio.DigitalInOut(board.GP25)
ledB = digitalio.DigitalInOut(board.GP0)
ledA.switch_to_output(value=False)
ledB.switch_to_output(value=False)

ledA_time = 0.3
ledB_time = 0.5

async def blink_A():
    while True:
        ledA.value = True
        await asyncio.sleep(ledA_time) 
        ledA.value = False
        await asyncio.sleep(ledA_time)

async def blink_B():
    while True:
        ledB.value = True
        await asyncio.sleep(ledB_time) 
        ledB.value = False
        await asyncio.sleep(ledB_time)

async def main():
    ledA_task = asyncio.create_task(blink_A())
    ledB_task = asyncio.create_task(blink_B())
    await asyncio.gather(ledA_task, ledB_task) 
    print("done")

asyncio.run(main())