teleren/devto huggingface dataset:
Are diodes required for x27 type motors?
Published: 2024-05-02 13:54:24

tl;dr *NO* (see below for oscilloscope traces)
 
I'm a bit of a noob when it comes to electronics, but I have a project using the X27 motor which is surprisingly difficult to find information about.

* You should both absolutely use a stepper driver board, and it's completely unnecessary.
* It's both completely safe, and unsafe to use them direct on PWM GPIO pins on a classic microcontroller with and without diodes.
* Break-out boards are on the market with and without place for flyback (EMF, etc) diodes.

As a *rule* you should plan with 2x the driver voltage for a flyback diode for any inductive load; 

I planned to use the X27 motor on a 3.3v power supply from an STM32 micro controller on a custom PCB, however coarse reading in the internet left me with questions if that's safe; forums (Arduino forums, naturally) recommend using an Arduino as they are "more tolerant".


![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/bal0j4zq8ad09nq488ha.gif)



I found in the STM32F103 datasheet that it's absolute max tolerance for a GPIO pin is 9v, and I'll be powering _that_ with a 5v supply, even though it's a 3.3v logic level.

For the ATMega32U4 on the Arduino Leonardo, the max tolerated voltage is VCC+0.5 (see "§29 Electrical characteristics")

* See https://cdn.sparkfun.com/datasheets/Dev/Arduino/Boards/ATMega32U4.pdf

These two traces show that _at worst_ there's about 5v on the bus, which seems to be outside the Arduino's tolerance, but it has ran perfectly OK for more than a week unattended on my desk, and it's well within spec for my STM32 project goals.

I *assume* this is something to do with driving AC loads with  PWM but I can't say for sure. I may also be measuring this wrongly as I grounded the probes to the arduino ground, and not to the "ac" ground. 

In the end, I'm just happy that it looks like driving these directly with an STM32 without any diodes or custom driver board should work just fine.

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/nqbcgdudzra9gpkp8uhp.png)

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/cbsq3w1fgbcqupad2uo5.png)
Website Development Services for Your Business | Debugged Proa
Published: 2024-05-02 13:46:50

Elevate your online presence with Debugged-Pro, a leading [web development company](https://debugged-pro.com/) in India. Specializing in custom applications, software, and ecommerce solutions.

Content Information: Debugged Pro Pvt. Ltd.

Address: Phase 8B, Industrial Area, Sector 74, Sahibzada Ajit Singh Nagar, Punjab 160055, Mohali, 0160055

Website: https://debugged-pro.com/

Email: debuggedpro01@gmail.com

Working Hours :

Monday to Thursday: 10 am–8 pm
Friday: 10 am–10 pm
Saturday and Sunday: Closed
How to import all AWS profiles from AWS LandingZone
Tags: aws, tutorial, beginners, devops
Published: 2024-05-02 13:38:58

If your organization using multiple AWS accounts, you probably know URL’s like [https://d-XXX.awsapps.com/start/#/](https://d-XXXXXXX.awsapps.com/start/#/) where you could login with your identity provider and and get credentials for AWS account you need.

![Yeah…that’s Enterprise baby!](https://cdn-images-1.medium.com/max/4484/1*RLRrOfI1J31UjdYwZ6mYvQ.png)

But what if that account list is a bit long…what if each of 268 accounts has more than one role?! What if you want to switch between them or sync credentials for multiple? DevOps Pass AI tries to simplify it a bit for you.

## Load AWS profiles from SSO

First of all it allows you to import all that profiles to your `~/.aws/profiles` file. If you wish it can sync all credentials for all profiles to `~/.aws/credentials`

![Sync AWS profiles from LandingZone](https://cdn-images-1.medium.com/max/4364/1*Ovey16St8Ik5ylNxcIRgRw.png)

All you need is paste your AWS LandingZone URL and click green button. It will open new window where you have to pass auth to LZ (via your corporate MS AD account, Okta, whatever). Once you logged in, script will grab all your accounts/roles and create profiles in `~/.aws/profiles` and sync AWS credentials if requested.

## Actions for AWS Profiles

Ok, now you have profiles in place, you have list of them on “AWS Profiles” tab, what else?

![AWS Profile actions](https://cdn-images-1.medium.com/max/2176/1*kqsk-_ZvXD9gLJwk6yEiIA.png)

* You can AWS Console for that ACCOUNT-ROLE

* Refresh AWS Credentials in `~/.aws/credentials` file

* Make current account default and put its credentials to “[default]” account in `~/.aws/credentials`

Refresh credentials will do almost the same action like for all accounts, but using cached credentials, if credentials doesnt work it will ask you to login to AWS LandingZone again.

Thats it! I hope it was useful, leave a comment!

## Support Us, Contact Us

![Rate Us](https://cdn-images-1.medium.com/max/2592/0*KiuyOybuJ0EpFwt8.jpeg)

Give us a start, we’re kitties 🐱🐯

Give us a star 🌟 on [GitHub](https://github.com/devopspass/devopspass/) or join our community on [Slack](https://join.slack.com/t/devops-pass-ai/shared_invite/zt-2gyn62v9f-5ORKktUINe43qJx7HtKFcw).
Divisible sum pairs
Tags: beginners, programming, tutorial, javascript
Published: 2024-05-02 13:33:31

*Prepare your favorite cup of coffee*, because we are about to enter the fantastic world of **Divisible sum pairs**.

## The problem

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/39o8zw5sja26n66waql7.png)

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/bj24xh7457aqrxqllrhj.png)

## The solution

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/2oed12xgu951nt2iork0.jpeg)

To start our solution, let's define the `divisibleSumPairs` function that will receive the following parameters:

* `n`: length of array `arr`;
* `k`: integer divisor;
* `ar`: input array.

```js
function divisibleSumPairs(n, k, ar) {}
```

Next we will initialize the `counter` variable with the value 0:

```js
let counter = 0;
```

Now let's go through the `ar` array from the first element to the penultimate element:

```js
for (let i = 0; i < n - 1; i++) {}
```

Inside the first loop, we will start a second loop, to cycle through the elements of the `ar` array from the `i + 1` element to the last element:

```js
for (let j = i + 1; j < n; j++) {}
```

After traversing the array `ar` with the two loops (integrating through the element `i` and the element `j` (`i + 1`)), we will check if the sum of the elements in the indices `i` and `j` of the array `arr` is divisible by `k` without remainder:

```js
if ((ar[i] + ar[j]) % k === 0) {}
```

If this condition is met, we will increase the value of the `counter` variable:

```js
counter++;
```

Thus, we will have the number of pairs that satisfy this condition counted in `counter`.

Finally, let's return the value of `counter`:

```js
return counter;
```

## Final resolution

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/iz6rxy97scdmno47m19w.jpeg)

After following the step by step we have our final resolution:

```js
function divisibleSumPairs(n, k, ar) {
    let counter = 0;
    
    for (let i = 0; i < n - 1; i++) {
      for (let j = i + 1; j < n; j++) {
        if ((ar[i] + ar[j]) % k === 0) {
          counter++;
        }
      }
    }
    
    return counter;
}
```

*Share the code, spread knowledge and build the future!* 😉

> Images generated by **DALL·E 3**
Dr. Ganesh Nagarajan - GI & Liver cancer surgeon
Tags: gastrointestinalsurgeon, healthcare, besthepatobiliarysurgeon, pancreaticsurgery
Published: 2024-05-02 13:23:30


![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/j88wdup9s2jrx1ymhyb9.jpg)
[Dr. Ganesh Nagarajan](https://www.cancersurgeryclinic.com/about-me) stands as one of the Best GI & Liver cancer surgeon, situated in Mumbai. With a specialized focus on Gastrointestinal and Hepatobiliary Pancreatic surgical oncology, he has amassed over 18 years of expertise in these intricate procedures. Currently serving as the Director of Hepatobiliary Pancreatic and Gastrointestinal Oncology at the prestigious [Nanavati Max Institute of Cancer Care in Mumbai](https://maps.app.goo.gl/WCxS7WzSbXyYiydn8), Dr. Nagarajan is deeply committed to advancing the treatment and understanding of Colorectal, Gastric, Liver, Pancreatic, Gall Bladder, and Biliary Cancers.

Get in touch with Dr. Ganesh Nagarajan for personalized care and expert guidance in treating GI & Liver cancers. Schedule your consultation now or you can contact us on **[7700058024](tel:7700058024)** to begin your journey towards better health.
SQL DATA TYPES
Published: 2024-05-02 13:16:26


**Hello Everyone**, 

This is my **Day 3** talking about SQL haha if you haven't read my other blogs you can view it in my profile then please read it also and dont forget to like it.

Now let's go back to our topic for today which is **SQL DATA TYPES** if you saw my previous post we discuss about queries and some theory about SQL now we're going to focus on sql data types. so first let's define what is data types.

SQL data types define the type of data that can be stored in the database table's columns. Each column have a data type, which determines the kind of values that can be inserted into that column. It's like were telling each column what only data we are accepting or to store in it.

Now that we have a glimpse of what is sql data types is now let's discuss the different types of data types.

## NUMERIC TYPES

- **INTEGER/INT** - Represents integer number whole numbers only no decimal points. there are range that integer are accepting it's like  **-2,147,483,648 to 2,147,483,64**7 number only. if you want to store big numbers you need  to use _BIGINT_. if small numbers _SMALLINT_.

---

- **DECIMAL(n, p)** - Represents fixed-points numbers with exact precision so if you're data have decimal you need to use decimal types to get also the decimal points of the data. if you use integer type the decimal point will not show.

---


## CHARACTER STRING TYPES 

-  **CHAR:** Fixed-length character strings like if you declare your column type is char(5) it will only limit it accepting 5 characters only. _CHAR_ can be useful when you know that the length of the data will always be the same, as it can help save storage space and ensure consistent data length. 

---
- **VARCHAR:** Variable-length character strings. this type is good to store texts the maximum length of this varchar is 255 only.

---
- **TEXT:**  Variable-length character strings with larger maximum length. this text is same in varchar but the text type can occupy more length than varchar.

## DATE AND TIME TYPES

- DATE: Represents date values in the format 'YYYY-MM-DD'. Specifically for date only.

- TIME: Represents time values in the format 'HH:MM:SS'. Opposite of the date.

- DATETIME/TIMESTAMP: Represents date and time values in the format 'YYYY-MM-DD HH:MM:SS'. It's like combination of the two above.

---

## Boolean Type:
- BOOLEAN/BOOL: Represents boolean values (true/false).


There are some types commonly found when viewing a database table schema. If you want to dive deeper into the data types, you can find more information in the documentation of your chosen database server, whether it's MySQL or PostgreSQL.


If you find this blog useful please drop a like and if you have something like concern or feedback you can free to comment on this post and we can discuss it. Thank you so much :) 

_MARKME_
Software Testing
Tags: testing, writing, programming, beginners
Published: 2024-05-02 13:12:43

Software testing is the process of evaluating and verifying that a software product or application does what it's supposed to do. The benefits of good testing include preventing bugs and improving performance. Verify and validate application quality to ensure it meets user requirements.                                   


software testing is the process of assessing the functionality of a software program. The process checks for errors and gapes and whether the outcome of the application  desired expectations before the software is installed and goes live.
          system software
          program software
          application software
      the three types are software testing.



Application software:
    Mobile based application. Use all your web application. front and code programming language.Ex:f12,google, you can see application you need correspond back and code language also an application mode. Ex: python, java
Help in build fullstack portfolio
Published: 2024-05-02 13:03:07

Hello everyone! I'm currently studying to land my first job as a full-stack engineer. Hailing from a small city in Brazil, over the past few years, I've been mastering and practicing multiple frameworks, learning web security best practices, and delving into microservices. However, I still lack a substantial number of practical projects in my portfolio.

While I'm dedicated to a significant personal project for my university, its completion will take a considerable amount of time. In the meantime, I'm eager to showcase additional projects on LinkedIn to bolster my job prospects. Any suggestions? I primarily work with Node.js, Java, and Golang.

My webportfolio: [gh-pages](https://dalton02.github.io/webportfolio/)

if you guys could provide feedback on the design, I would greatly appreciate it.
#2441. Largest Positive Integer That Exists With Its Negative
Published: 2024-05-02 13:01:09

https://leetcode.com/problems/largest-positive-integer-that-exists-with-its-negative/?envType=daily-question&envId=2024-05-02

```javascript
/**
 * @param {number[]} nums
 * @return {number}
 */
var findMaxK = function (nums) {
    let k = -1
    let seen = new Set(nums)

    for (const num of nums) {
        if (seen.has(-num)) {
            k = Math.max(k, num)
        }
    }

    return k
};

```

 A very interesting question.
Day 2: Setting Up Angular Development Environment
Tags: angular, javascript, typescript, learning
Published: 2024-05-02 12:59:19

## 🚀 Check Out My YouTube Channel! 🚀
Hi everyone! If you enjoy my content here on Dev.to, please consider subscribing to my YouTube channel [devDive with Dipak](https://www.youtube.com/@DevDivewithDipak). I post practical full-stack development videos that complement my blog posts. Your support means a lot!

In Day 1, we introduced Angular and its key features. Today, we will focus on setting up your Angular development environment. Having a well-configured environment is crucial for smooth development and testing of Angular applications.

### Prerequisites

Before setting up your Angular development environment, ensure you have the following tools installed on your system:

1. **Node.js and npm**: Node.js is a JavaScript runtime that allows you to run JavaScript on the server-side. npm is the Node Package Manager used for installing and managing dependencies.

2. **Angular CLI**: The Angular Command Line Interface (CLI) is a powerful tool that simplifies the process of creating, building, and maintaining Angular applications.

### Steps to Set Up Angular Development Environment

#### Step 1: Install Node.js and npm

1. Visit the [Node.js website](https://nodejs.org/) and download the latest version of Node.js for your operating system.
2. Follow the installation instructions to install Node.js and npm.
3. To verify the installation, open a terminal or command prompt and run the following commands:

   ```
   node -v
   npm -v
   ```

   These commands should display the installed Node.js and npm versions.

#### Step 2: Install Angular CLI

1. Open a terminal or command prompt and run the following command to install the Angular CLI globally:

   ```
   npm install -g @angular/cli
   ```

2. Once the installation is complete, you can verify the installation by running:

   ```
   ng --version
   ```

   This command will display the installed Angular CLI version along with other relevant information.

#### Step 3: Create a New Angular Project

1. To create a new Angular project, navigate to the directory where you want to create the project and run:

   ```
   ng new my-angular-app
   ```

2. The Angular CLI will prompt you to choose various options such as routing, stylesheet format, and more. Make your selections based on your project requirements.

#### Step 4: Serve the Application

1. Navigate into the newly created project directory:

   ```
   cd my-angular-app
   ```

2. Start the development server by running:

   ```
   ng serve
   ```

3. Your Angular application will be available at `http://localhost:4200/`. Open this URL in your browser to see your application running.

### Conclusion

Setting up your Angular development environment is the first step towards building robust and efficient Angular applications. By following these steps, you now have a fully functional Angular development environment ready for creating amazing web applications. In the next blog post, we will delve into the core concepts of Angular, starting with Components.
Advanced Index Rebuild and Maintenance Strategies for SQL Server
Tags: sql, sqlserver, devart, dbforge
Published: 2024-05-02 12:58:03

In the dynamic realm of SQL Server database administration, keeping a system responsive and healthy requires optimizing index performance. Let's examine index fragmentation and how it affects database performance, rebuild and rearrange indexes, and discuss automating index maintenance in this post. Let's go into the nuances of index maintenance tactics. After discussing maintenance schedule best practices, this article explores how dbForge Studio for SQL Server and other similar tools may improve index management by offering a solid structure for effective and efficient database maintenance.

Learn more: https://blog.devart.com/rebuilding-indexes-in-sql-server.html
Javascript rest operator
Published: 2024-05-02 12:51:10


let person = {
        firstname : "Raja",
        age : "56",
        contact : 983736333
}

 console.log(person.firstname)
 console.log(person.age)

 let a = [1,3,4,5]

 console.log(a[3])

//rest operator

let {age,contact, ...rest } = person

console.log(age,contact,rest)
FINQ's weekly market insights: Peaks and valleys in the S&P 500 – May 2, 2024
Tags: stockmarket, stocks, ai, sp500
Published: 2024-05-02 12:50:35

Dive into this week's highs and lows in the S&P 500, powered by FINQ's advanced AI insights.

**Top achievers:**
- **Amazon (AMZN)** retains its lead with strong scores.
- **Meta Platforms (META)** rises to second with improved Crowd and Professional Wisdom.
- **Salesforce (CRM)**, now third, faces challenges with declining scores.

**Facing challenges:**
- **Loews Corp (L)** continues as the least favored.
- **Franklin Resources Inc (BEN)** worsens to second from bottom.
- **Broadridge Financial (BR)** enters the list, struggling with Professional Wisdom.

Explore the dynamics and understand the shifts with our detailed analysis and forecasts.

**Disclaimer:** This information is for educational purposes only and is not financial advice. Consider your financial goals and risk tolerance before investing.
Hair Food Oil
Published: 2024-05-02 12:45:22

Hair Food Oil is a nourishing hair treatment designed to hydrate and revitalize your strands. It’s typically infused with a blend of natural oils, like coconut or argan oil, that deeply condition your hair and scalp. Regular use of [Hair Food Oil](https://hairfoodoil.com/) can help reduce frizz, promote shine, and improve overall hair health, making it an essential addition to your hair care routine.
Разработка серверов Lineage 2 - это увлекательный процесс, требующий навыков программирования
Tags: lineage2, mmorpg
Published: 2024-05-02 12:35:55

Выбор эмулятора: Первым шагом в создании сервера Lineage 2 является выбор эмулятора. Существует несколько популярных эмуляторов, таких как L2J (Java), L2OFF (C++), L2JMobius и другие. Каждый из них имеет свои преимущества и недостатки, и выбор зависит от потребностей проекта.

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/cloziy4t8dcwky2m8ckr.jpg)
Установка и настройка: После выбора эмулятора необходимо установить его на сервере и настроить. Это включает в себя установку базы данных, скриптов, конфигурационных файлов и других компонентов, необходимых для запуска сервера.
Настройка игрового мира: Следующим шагом является настройка игрового мира. Это включает в себя создание игровых зон, настройку NPC, монстров, предметов, квестов, навыков и других игровых элементов. Важно соблюдать баланс игрового мира, чтобы игроки могли получать удовольствие от игры.
Тестирование и отладка: После того как сервер настроен, необходимо провести тестирование для выявления и исправления ошибок. Это включает в себя тестирование игрового процесса, проверку баланса, исправление багов и других проблем.
Запуск и поддержка: После успешного завершения тестирования сервер можно запустить и открыть для игроков. Однако работа над сервером не заканчивается на этом этапе. Необходимо обеспечить его стабильную работу, проводить регулярные обновления, исправлять ошибки и поддерживать общение с игровым сообществом.
Развитие и обновления: Для привлечения и удержания игроков важно постоянно развивать сервер и вносить нововведения. Это может быть добавление новых контентных обновлений, исправление баланса, внедрение новых функций и т. д.
Разработка серверов Lineage 2 - это долгий и сложный процесс, но с правильным подходом и усилиями можно создать успешный игровой проект, который привлечет множество игроков.

Один из разработчиков и создателей модульной игры Lineage2 есть [L2-top.ru](https://l2-top.ru/)