openMV扫描二维码无线传输代码

以下是使用OpenMV扫描二维码并通过Wi-Fi模块无线传输的代码示例：

import network
import ubinascii
import socket
import time
import json
import pyqrcode
import machine
import ujson
import urequests
import qrcode
from machine import UART
from machine import Pin
from pyb import LED
from pyb import Timer
from pyb import WDT
from pyb import ADC
from pyb import SPI
from pyb import I2C
from micropython import const
from umqtt.simple import MQTTClient
from openmv import pyb_uart

# 设置Wi-Fi连接信息
WIFI_SSID = "your_wifi_ssid"
WIFI_PASSWORD = "your_wifi_password"

# 设置MQTT连接信息
MQTT_SERVER = "mqtt.yourserver.com"
MQTT_PORT = 1883
MQTT_CLIENT_ID = "your_client_id"
MQTT_TOPIC = "your_topic"

# 初始化Wi-Fi连接
def wifi_init():
    wlan = network.WLAN(network.STA_IF)
    wlan.active(True)
    if not wlan.isconnected():
        print("Connecting to Wi-Fi...")
        wlan.connect(WIFI_SSID, WIFI_PASSWORD)
        while not wlan.isconnected():
            time.sleep(1)
    print("Wi-Fi connected: ", wlan.ifconfig())
    return wlan

# 初始化MQTT连接
def mqtt_init():
    client = MQTTClient(MQTT_CLIENT_ID, MQTT_SERVER, MQTT_PORT)
    client.connect()
    return client

# 扫描二维码
def scan_qr_code():
    sensor.reset()
    sensor.set_pixformat(sensor.RGB565)
    sensor.set_framesize(sensor.QVGA)
    sensor.skip_frames(time = 2000)
    img = sensor.snapshot()
    qr_code = img.find_qrcodes()
    if len(qr_code) > 0:
        return qr_code[0].payload()
    else:
        return None

# 无线传输数据
def wireless_transfer(qr_code_data, wlan, client):
    if qr_code_data:
        wlan.disconnect()
        time.sleep(1)
        wlan.active(False)
        time.sleep(1)
        wlan.active(True)
        time.sleep(1)
        wlan.connect(WIFI_SSID, WIFI_PASSWORD)
        while not wlan.isconnected():
            time.sleep(1)
        print("Wi-Fi reconnected: ", wlan.ifconfig())
        client.publish(MQTT_TOPIC, ujson.dumps(qr_code_data))
        print("Data transferred: ", qr_code_data)
        wlan.disconnect()
        wlan.active(False)
        pyb.hard_reset()

# 主函数
if __name__ == "__main__":
    sensor = pyb_uart.init_uart("X3", baudrate = 115200)
    wlan = wifi_init()
    client = mqtt_init()
    while True:
        qr_code_data = scan_qr_code()
        wireless_transfer(qr_code_data, wlan, client)
        time.sleep(1)

以上代码中，我们使用OpenMV的图像识别库来实现二维码的扫描，然后通过Wi-Fi模块和MQTT协议进行无线数据传输。在传输数据之前，我们先断开Wi-Fi连接，然后重新连接并将数据通过MQTT协议发送出去，最后再次断开Wi-Fi连接以确保数据传输完成后设备正常重启。