6 篇文章带有标签 “NodeMCU”

WS2812B 灯带 一个集控制电路与发光电路于一体的智能外控LED光源。可单独寻址数字 LED 灯。 每个像素都有自己的颜色和亮度。 您可以单独控制它们,并将其设置成任何颜色。 256 灰色级别可调节和 16777216 彩色 24 位全彩显示。

2. 导入成功

2. 创建成功

3. 新建设备的二维码，可以使用腾讯连连扫描快速增加。

4. 在线调试

• light.py

from machine import ADC
from machine import Pin
class Light():
    """
    基于 PT550 环保型光敏二极管的光照传感器元器件，它的灵敏度更高，测量范围是 0Lux～6000Lux。
    Lux（勒克斯）是光照强度的单位，它和另一个概念 Lumens（流明）是不同的。Lumens 是指一个光源（比如电灯、投影仪）发出的光能力的总量，而 Lux 是指空间内一个位置接收到的光照的强度。
    因为 ADC 支持的最大位数是 12bit，所以这个数值范围是 0~4095 之间。这里按照线性关系做一个转换。
    """
    def __init__(self, pin):
        self._light = ADC(Pin(pin))

    def value(self):
        value = self._light.read()
        print("Light ADC value:", value)
        return int(value/4095*6000)

• tencent_mqtt.py

import time
import ujson
from umqtt.simple import MQTTClient
from light import Light
"""
QCloud Device Info
"""
DEVICE_NAME = ""
PRODUCT_ID = ""
DEVICE_KEY = ""
"""
MQTT topic
"""
MQTT_DEVICE_CONTROL_TOPIC = "$thing/down/property/"+PRODUCT_ID+"/"+DEVICE_NAME
MQTT_DEVICE_STATUS_TOPIC = "$$thing/up/property/"+PRODUCT_ID+"/"+DEVICE_NAME
MQTT_SERVER = PRODUCT_ID + ".iotcloud.tencentdevices.com"
MQTT_PORT = 1883
MQTT_CLIENT_ID = PRODUCT_ID+DEVICE_NAME
MQTT_USERNAME = ""
MQTT_PASSWORD = ""
class LightSensor():
    def __init__(self):
        self.light = Light(36)
class TencentMQTT():
    light_sensor = LightSensor()

    def __init__(self):
        self.mqtt_client = None

    def connect(self):
        self.mqtt_client = MQTTClient(MQTT_CLIENT_ID, MQTT_SERVER, MQTT_PORT, MQTT_USERNAME, MQTT_PASSWORD, 60)
        self.mqtt_client.set_callback(TencentMQTT.control)
        self.mqtt_client.connect()
 
    """
    接收订阅的消息（用于远程控制）
    """
    @staticmethod
    def control(topic, msg):
        pass

    """
    发送设备的状态消息
    """
    def report(self):
        msg = {
            "method": "report",
            "clientToken": "clientToken-0123456789",
            "params": {
                "Illuminance": self.light_sensor.value()
            }   
        }

        self.mqtt_client.publish(MQTT_DEVICE_STATUS_TOPIC.encode(), ujson.dumps(msg).encode())

    """
    消息循环
    """
    def loop(self):
        self.mqtt_client.subscribe(MQTT_DEVICE_CONTROL_TOPIC.encode())

        up_time = 5000
        time_sleep = 50
        time_count = 0
        while True:
            self.mqtt_client.check_msg()

            time_count += time_sleep
            if (time_count >= up_time):
                self.report()
                time_count = 0

            time.sleep_ms(time_sleep)

2. 保存

3. 选择智能家居

4. 新建产品

5. 保存

• 配置小程序，快速入口配置

1. 新建设备

2. 设备的详细信息，用于开发的三元组（产品ID、设备名称、设备密钥）

3. 新建设备的二维码，可以使用腾讯连连扫描快速增加。

• led.py

from machine import PWM
from machine import Pin
class LED():
    """
    LED模块
    """
    def __init__(self, rpin, gpin, bpin, freq=1000):
        """
        构造函数
        :param pin: 接LED的管脚，必须支持PWM
        :param freq: PWM的默认频率是1000
        """
        self.pin_red = Pin(rpin)
        self.pin_green = Pin(gpin)
        self.pin_blue = Pin(bpin)

        self.led_red = PWM(self.pin_red, freq = freq)
        self.led_green = PWM(self.pin_green, freq = freq)
        self.led_blue = PWM(self.pin_blue, freq = freq)

    def rgb_light(self, red, green, blue, brightness):
        if red in range(256) and \
            green in range(256) and \
            blue in range(256) and \
            0.0 <= brightness and \
            brightness <=1.0:
            self.led_red.duty(int(red/255*brightness*1023))
            self.led_green.duty(int(green/255*brightness*1023))
            self.led_blue.duty(int(blue/255*brightness*1023))
        else:
            print("red green blue must between 0 and 255, and brightness from 0.0 to 1.0")
        
    def deinit(self):
        """
        析构函数
        """
        self.led_red.deinit()
        self.led_green.deinit()
        self.led_blue.deinit()

• 数据线，一头是 USB-A 接口，另一头是 Micro-USB 接口。

2. 擦除 Flash 芯片

esptool.py --chip esp32 --port /dev/cu.usbserial-1410 erase_flash

3. 烧录固件

esptool.py --chip esp32 --port /dev/cu.usbserial-1410 --baud 460800 write_flash -z 0x1000 esp32-idf3-20210202-v1.14.bin

• 如果不先打开WIFI将会出现下面的错误

import ubluetooth
ble = ubluetooth.BLE()
ble.active(True)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
OSError: [Errno 110] ETIMEDOUT

• 数据线，一头是 USB-A 接口，另一头是 Micro-USB 接口。

2. 运行 esptool.py read_mac 命令，确认连接成功。

$ esptool.py read_mac
esptool.py v3.0
Found 2 serial ports
Serial port /dev/cu.usbserial-0001
Connecting....
Detecting chip type... ESP8266
Chip is ESP8266EX
Features: WiFi
Crystal is 26MHz
MAC: f4:cf:a2:ec:0a:86
Uploading stub...
Running stub...
Stub running...
MAC: f4:cf:a2:ec:0a:86
Hard resetting via RTS pin...

3. 查看设备文件

$ ls /dev/cu*
/dev/cu.Bluetooth-Incoming-Port /dev/cu.usbserial-0001

2. 擦除 Flash 芯片

esptool.py --port /dev/cu.usbserial-0001 erase_flash

烧录固件 esptool.py --port /dev/cu.