Created
August 21, 2020 01:12
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import board | |
import digitalio | |
import time | |
import neopixel | |
PWM_BLINK_RATE = 0.5 # seconds | |
LED_FADE_STEPS = 400 # 400 steps = 100 for each of: | |
# red_fade_up, red_fade_down, blue_fade_up, blue_fade_down | |
LED_FADE_TIME = 0.01 # seconds between steps of neopixel fading | |
PREV_PWM_TIME = 0 # monotonic timestamp of laste time pwm changed | |
PREV_LED_TIME = 0 # monotonic timestamp of laste time neopixel changed | |
pwm = digitalio.DigitalInOut(board.D5) | |
pwm.direction = digitalio.Direction.OUTPUT | |
pixels = neopixel.NeoPixel(board.NEOPIXEL, 1) | |
pixels.brightness = 0.5 | |
RED = (255, 0, 0) | |
BLUE = (0, 0, 255) | |
def current_fade_pixels_action(i): | |
if i < LED_FADE_STEPS/4: | |
pixels.brightness = ((i%100) * (1.0 / 100)) | |
pixels.fill(RED) | |
elif i < LED_FADE_STEPS/2: | |
pixels.brightness = (1.0 - (i%100) * (1.0 / 100)) | |
pixels.fill(RED) | |
elif i < (LED_FADE_STEPS/4) * 3: | |
pixels.brightness = ((i%100) * (1.0 / 100)) | |
pixels.fill(BLUE) | |
elif i < LED_FADE_STEPS: | |
pixels.brightness = (1.0 - (i%100) * (1.0 / 100)) | |
pixels.fill(BLUE) | |
#print("{} - {}".format(i, pixels.brightness)) | |
i = 0 | |
while True: | |
now = time.monotonic() | |
if PREV_PWM_TIME + PWM_BLINK_RATE <= now: | |
pwm.value = not pwm.value | |
PREV_PWM_TIME = now | |
if PREV_LED_TIME + LED_FADE_TIME <= now: | |
PREV_LED_TIME = now | |
current_fade_pixels_action(i) | |
i += 1 | |
if i == LED_FADE_STEPS: | |
i = 0 |
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