MicroPython ESP8266基于NeoPixel 驱动WS2812

MicroPython ESP8266基于NeoPixel 驱动WS2812

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• 相关篇《【MicroPython esp8266】固件烧写教程》
• ✨本案例基于Thonny平台开发。✨
• 固件版本信息：MicroPython v1.19.1 on 2022-06-18; ESP module with ESP8266
• ESP8266可用管脚有：0、1、2、3、4、5、12、13、14、15、16，对应ESP8266芯片实际的GPIO管脚编号。
• NeoPixel库默认是已经打包到ESP8266 Python固件当中了，在使用时只需引入该模块名即可调用。

效果示例一

import machine
import neopixel
import time


red = (128, 0, 0)
green = (0, 128, 0)


# Turn off all the LEDs
def off(np):
    for i in range(np.n):
        np[i] = (0, 0, 0)
    np.write()


def evens_green(np):
    for i in range(np.n):
        if i % 2 == 0:
            np[i] = green
        else:
            np[i] = red
    np.write()


def evens_red(np):
    for i in range(np.n):
        if i % 2 == 0:
            np[i] = red
        else:
            np[i] = green
    np.write()


def alternate_colors(np):
    if np[0] == green:
        evens_red(np)
    else:
        evens_green(np)


if __name__ == '__main__':
    # Data line is on pin 13
    # and there are 12 LEDs on our NeoPixel ring
    np = neopixel.NeoPixel(machine.Pin(13), 8)
    for i in range(20):
        alternate_colors(np)
        time.sleep(1)
# 关闭显示        
    off(np)
    # do_connect()
    # at this point we should start a cycle of colors
    # and also start listening for any webrepl or api commands

效果示例二

import machine
import neopixel
import time

WIFI_SSID = "#######"
WIFI_PASS = "*******"

def do_connect():
    import network
    sta_if = network.WLAN(network.STA_IF)
    if not sta_if.isconnected():
        print('connecting to network...')
        sta_if.active(True)
        sta_if.connect(secrets.WIFI_SSID, secrets.WIFI_PASS)
        while not sta_if.isconnected():
            pass
    print('network config:', sta_if.ifconfig())


# cycle one LED around the circle
def cycle(np):
    n = np.n
    for i in range(4 * n):
        for j in range(n):
            np[j] = (0, 0, 0)
        np[i % n] = (68, 125, 67)
        np.write()
        time.sleep_ms(25)


def bounce_blue(np):
    n = np.n
    for i in range(4 * n):
        for j in range(n):
            np[j] = (0, 0, 128)
        if (i // n) % 2 == 0:
            np[i % n] = (0, 0, 0)
        else:
            np[n - 1 - (i % n)] = (0, 0, 0)
        np.write()
        time.sleep_ms(60)


# all the LEDs make a brighter/dimmer red with fad effect
def fade_red(np):
    n = np.n
    for i in range(0, 4 * 256, 8):
        for j in range(n):
            if (i // 256) % 2 == 0:
                val = i & 0xff
            else:
                val = 255 - (i & 0xff)
            np[j] = (val, 0, 0)
        np.write()


# Turn off all the LEDs
def off(np):
    n = np.n
    for i in range(n):
        np[i] = (0, 0, 0)
    np.write()


# Make a nice red-orange glow
def fire(np, red=(240, 0, 0), orange=(240, 120, 0)):
    for i in range(np.n):
        if i % 2 == 0:
            np[i] = red
        else:
            np[i] = orange
    np.write()


# Calculate an orange based on the max and current brightness
def calc_orange(max_bright, current):
    return (max_bright - current, (max_bright - current) // 2 + 1, 0)


def flame(np):
    max_brightness = 120
    for f in range(4, max_brightness):
        # Start with bright orange and dim red
        red = (f, 0, 0)
        orange = calc_orange(max_brightness, f)
        fire(np, red, orange)
    for f in range(max_brightness, 4, -1):
        # Now orange LEDs are dim and the red ones are bright, so switch:
        red = (f, 0, 0)
        orange = calc_orange(max_brightness, f)
        fire(np, red, orange)


if __name__ == '__main__':
    # Data line is on pin 13
    # and there are 8 LEDs on our NeoPixel ring
    np = neopixel.NeoPixel(machine.Pin(13), 8)
    do_connect()
    # at this point we should start a cycle of colors
    # and also start listening for any webrepl or api commands
    for i in range(3):
        flame(np)
        time.sleep(1)
    for i in range(3):
        fade_red(np)
        time.sleep(1)
# Blue      
    for i in range(3):
        bounce_blue(np)
        time.sleep(1)
        
    for i in range(3):
        cycle(np)
        time.sleep(1)