无法使用 pyserial 串行写入 arduino

Question

我正在尝试使用 pyserial 包将 1 或 0 发送到 arduino。我将 arduino 物理插入 USB 端口 (COM6) 并让它运行以下代码块以响应输入打开或关闭灯。

#define LED_PIN 12

void setup()
{
  // Set up serial communication at 9600 baud
  Serial.begin(9600);

  pinMode(LED_PIN, OUTPUT);
}

void loop()
{
  if (Serial.available() > 0) {
    char cmd = Serial.read();
    if (cmd == '1') {
      digitalWrite(LED_PIN, HIGH);
      Serial.println("LED turned on!");
    }
    else if (cmd == '0') {
      digitalWrite(LED_PIN, LOW);
      Serial.println("LED turned off!");
    }
  }
}

但是，我的 python 代码中的行

ser = serial.Serial("COM6", 9600)

正在生成错误消息：

serial.serialutil.SerialException: could not open port 'COM6': PermissionError(13, 'Access is denied.', None, 5)

。我已经尝试确保所有可以访问串行端口的程序都已关闭（包括 arduino IDE）并更新并重新启动我的电脑。奇怪的是，这两段代码在朋友的电脑上都能正常工作，arduino 能够接受串行命令。有人有进一步的故障排除建议吗？

下面是所有的 python 代码，如果它有用的话，我们正在尝试使用 flask 设置一个 UI。提前感谢任何有耐心帮助这个初学者的人:)

import numpy
from flask import Flask, render_template, session, redirect
from functools import wraps
import pymongo
import serial



app = Flask(__name__)

#set up secret.key
app.secret_key = ...

#Database
client = pymongo.MongoClient(...)
db = client.user_login_system

# Decorators, decide whether or not to allow user go to specific pages
def login_required(f):
    @wraps(f)
    def wrap(*arg, **kwargs):
        #checks if user is logged in
        if 'logged_in' in session:
            #if yes, it renders the dashboard templates
            return f(*arg, **kwargs)
        else:
            #if not, it redirects to the home pahe
            return redirect('/')
        
    return wrap

#We need to import our routes as well in this file
from user import routes

#create route
@app.route('/')
def home():
    return render_template('home.html')

#best rout to assure that assure lands on that page
@app.route('/dashboard/')

#checks if user is logged in before even allowing access to dashboard
@login_required

def dashbaord():
    # Render the dashboard template with the current LED status
    return render_template("dashboard.html", status='OFF')

#create file to automatically execute flask
#set up two templates one for Home page and another for dashboard page
#arduino stuff (V1)
ser = serial.Serial("COM6", 9600)

# Define route for turning LED on
@app.route('/turn_on/')
def turn_on():
    ser.write(b'1')  # Send "1" to Arduino to turn on LED
    #return 'LED turned on!'
    return render_template("dashboard.html", status="LED is oN")

# Define route for turning LED off
@app.route('/turn_off/')
def turn_off():
    ser.write(b'0')  # Send "0" to Arduino to turn off LED
    #return 'LED turned off!'
    return render_template("dashboard.html", status="LED is off")

Answer 1

您是否尝试授予它正确的权限？ 尝试以管理员身份运行此代码。