• Micropython: Using Coroutines for blinking LEDs Micropython

    I just made my first steps with the uasyncio module in Micropython and I'm impressed. Here is a small example how to use coroutines for letting all 3 LEDs on the Pyboard v1.1 blink with different intervals. The resulting code is unexpectedly short but also readable.

    import pyb
    import uasyncio as asyncio
    async def blink_led(led, interval_s):
        """Let the LED blink in the given interval."""
        while True:
            await asyncio.sleep(interval_s)
    led_red = pyb.LED(1)  # red led on the pyboard
    led_green = pyb.LED(2)  # green led on the pyboard
    led_yellow = pyb.LED(3)  # yellow led on the pyboard
    # get a new event loop
    loop = asyncio.get_event_loop()
    # create new tasks for each led
    loop.call_soon(blink_led(led_red, interval_s=0.5))
    loop.call_soon(blink_led(led_green, interval_s=1))
    loop.call_soon(blink_led(led_yellow, interval_s=2))
    # run all tasks

    For a comprehensive tutorial on Micropython async have a look at https://github.com/peterhinch/micropython-async.

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