ESP/examples/gpio_basic/heartbeat_single_led.py at master · Lupin3000/ESP · GitHub

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from micropython import const
from machine import PWM, Pin
from utime import sleep_us


LED_GPIO_PIN = const(23)
LED_FREQUENCY = const(5000)
DELAY_MAIN = const(300)
DELAY_LOW = const(1000)
DELAY_END = const(500000)


if __name__ == '__main__':
    led = PWM(Pin(LED_GPIO_PIN))
    led.freq(LED_FREQUENCY)

    while True:
        print('[INFO] Fade LED ON (main beat)')
        for dc in range(0, 1023):
            led.duty(dc)
            sleep_us(DELAY_MAIN)

        print('[INFO] Fade LED OFF (main beat)')
        for dc in range(1023, 0, -1):
            led.duty(dc)
            sleep_us(DELAY_MAIN)

        print('[INFO] Fade LED ON (low beat)')
        for dc in range(0, 1023):
            led.duty(dc)
            sleep_us(DELAY_LOW)

        print('[INFO] Fade LED OFF (low beat)')
        for dc in range(1023, 0, -1):
            led.duty(dc)
            sleep_us(DELAY_LOW)

        led.duty(0)
        sleep_us(DELAY_END)