Servo motor basic control pic16f877a jobs

...multi-channel signals. • Familiarity with line level audio signal processing and mixing. We need an engineer with deep experience in high-end analog circuit design using low noise operational amplifiers. We will provide basic diagrams and objectives. The project involves high quality op amps and line drivers for an audio routing project. We will be using FPGA platforms with SPI and TCP/IP to send commands to digitally controlled audio daughterboards in a card cage configuration. The proof of concept will include circuit design and a functioning prototype of two audio channel for control and noise and sweep analysis of the output. We have pre-selected chip sets and will provide prototype hardware....

I am looking for an expert who can seamlessly integrate Facebook meta pixel into Google Tag Manager to accura...product purchases on my platform. Specifically, the project requirements are: - Integration of FB meta pixel with Google Tag Manager - Configuring the pixel to track product purchase values - Ensuring the delivery of purchase value data in numerical format Skills required: - Proficiency in using Google Tag Manager and Facebook meta pixel - Experience with website tracking and data analysis - Basic understanding of e-commerce platforms The freelancer should be demonstrating a deep understanding of the nuances of tracking purchase values and ensuring data accuracy. Above all, the freelancer must have prior experience in Facebook pixel and Google Tag Manager integration...

I want to create Basic Vector Logo , A letter Head , And a Membership form FORM is in excel or PDF

I'm seeking a data aggregator for a unique AI training project. Key Tasks: - Gathering text content from official website/source of the particular product/entity. - Focusing specifically on product descriptions, specifications, price and other attributes. Ideal Skills: - Basic searching skills - Able to follow given format of data collection - MS Excel or Google Sheets This project requires precision, and the information gathered will contribute to an AI's learning process. Accuracy in aggregation is, therefore, key.

I'm searching for an expert in environmental engineering with a focus on air pollution control for a predominantly national scale project. Here's a breakdown of the project: -A detailed understanding of modern air pollution control methods and techniques. -Building effective pollution control constructs on a national level. Ideal skills and experience include: -Environmental/engineering master degree specializing in air pollution control -Experience with large-scale pollution control projects -In-depth knowledge of national pollution standards and laws -The ability to develop efficient and practical solutions to air pollution issues -15 years experiences or above is perferrable I look forward to groundbreaking contributions in controlling ai...

In the course of my family law practice, I require occasional Italian-English interpretation services. While the frequency of these services varies, the need is real and sometimes urgent, so I am looking for someone I can rely upon when necessary. Key Requirements: • Expertise in Italian-English interpretation. Although we're dealing with legal terms, basic conversational fluency is adequate for this role. • Familiarity with the intricacies of family law is an added advantage. Skills and Experience: • Demonstrable previous experience in translation or interpretation services would be an advantage. • Good communication skills. • Flexibility to accommodate varying schedules due to the occasional nature of the service demand.

Help me with the software code and wiring for a Arduino. 1. turn the motor(hydraulic pump) forward and sense the currrent as it ramps up to 170mA and stops. 2. turn the motor in reverse and monitor the position sensor.

...be capable of very precise movements. This is a critical part of the project, so experience with servo motors and ensuring the accuracy of their control is key. - Range of Motion: The hand should be capable of a wide range of motion. This is essential to the functionality for the research at hand. Materials and Components: - 3D Printed Parts: The project will make use of 3D printed parts, so familiarity with this aspect is a requirement. - Plastic Components: The majority of the hand will be constructed from plastic components. Ideal Skills and Experience: - Proficiency in Robotics: Experience in robotics projects is crucial. - Servo Motor Control: A good understanding of how to control servo motors for precise and varied movements. - 3...

I need a freelancer to edit two images, changing the measurements currently in centimeters to inches. I have two images, one for large size suit and another for medium size suit. Currrently all measurements are in cm. Please convert to inches update the two images with inches instead of cm. Skills/Experience: - Proficient in photo editing software - Strong attention to detail - Basic mathematical focus for accurate conversion - A keen eye for aesthetics, to choose pleasing and readable fonts.

I'm in need of an expert in Continuous Integration/Continuous Deployment who can establish a pipeline for my React Native application in Apple TestFlight. Here are the key aspects of the job: - Existing Systems: I already have a TestFlight account with Apple and my application's version control system is Git on GitHub. Experience with these is a must. - Testing: There's no immediate need to integrate tests into the CI/CD pipeline. The main focus should be on setting up the pipeline for automated deployments. - Skills: Extensive knowledge and hands-on experience in CI/CD, Apple TestFlight, React Native, and GitHub. You should understand workflows and how to troubleshoot and modify processes as required. This project requires a keen eye for detail, excellent problem-...

...communication with guests, and appropriately logging all reservation details. 2. Accounting Assistance: - We are also looking for an accountant. Your responsibilities would include addressing guest inquiries about charges, and ensuring all financial transactions related to reservations are accurately processed and recorded. Ideal candidates should have experience in hotel reservation systems and basic accounting. Familiarity with financial tracking software and customer service skills are a must. Note: This project involves dealing with financial data, hence trustworthiness and attention to detail are crucial....

I'm in need of a freelancer who can create simple assembly drawings in Fusion 360 for a project I'm working on. Key Requirements: - Experience with Fusion...working on. Key Requirements: - Experience with Fusion 360: You should be proficient and comfortable working in this software to create accurate and clear assembly drawings. - Attention to Detail: The drawings should reflect basic shapes and dimensions of the components involved in the assembly. The final deliverable should be a set of assembly drawings providing a clear outline of how the different parts fit together. No need for detailed assembly instructions, just the assembly drawings themselves. If you're confident in your Fusion 360 skills and can deliver these basic assembly drawings efficie...

I'm looking for a fre...in data integration and ETL processes. - Experience with public datasets. - Advanced knowledge of Microsoft Power BI. - Solid understanding of the business needs behind data warehousing. What exactly I will need you to deliver in the 1st stage: -EXPECTATIONS AND DETAILED NEEDS FOR DECISION SUPPORT -SCOPE OF ANALYSIS – ASPECTS EXAMINED -DATA SOURCES -LOCATION, FORMAT, AVAILABILITY -DATA SOURCE BASIC INFORMATION -DATA SOURCE INITIAL ASSESMENT (ADDITIONAL INFORMATION. TIME SPAN FOR FACTS, ETC.) -DIMENSIONAL MODEL SYNOPSIS -FACTS AND MEASURES -CONTEXT FOR FACTS -DIMENSION OVERVIEW -DATA SOURCE DETAILS -DOMAIN DATA DICTIONARY -QUALITY ASSESMENT SHEET If you have a background in this field and can help me with this initial phase of the project, I'...

I'm seeking an experienced freelancer who can convert my PDF documents, which include images and tables, into Word format. The main objective is the need to edit the content. Key requirements include: - Maintaining the content's original integrity while stripping away the complex formatting to a basic Word format. Your craftsmanship in handling text with images and tables is vital here. - I want the converted Word documents to be fully editable and easy to use. Attention to detail is a must. - Experience with similar tasks is much appreciated. Freelancer should have familiarity with both PDF and Word formatting options, and a keen eye for design to ensure the visual aspects of the content are preserved during conversion. Ability to handle documents with images and ...

Hi! I am an individual real estate agent based in Indiana and I'm looking for someone to help me with basic social media management to gain traction and bring in new leads. I currently have a Facebook, Instagram, and LinkedIn. The CRM my brokerage uses is Lofty and I also have a Canva premium account. If this is something you're interested in, let me know:). Hope to hear back soon, Thanks! Alexa Breedlove

Project Description: I am in need of a tale...needs to be properly rigged to allow for realistic movement and animation. The freelancer should have expertise in rigging techniques. - Texturing: While not explicitly mentioned by the client, it is assumed that texturing may be required to enhance the visual appeal of the character model. - Prototyping: Although not mentioned by the client, the freelancer should be able to create a prototype or a basic representation of the character model and rig animation to present to the client for feedback and approval. Please provide examples of your previous work in character modeling and rig animation, showcasing your ability to create high-quality animations with simple motions for human characters.

...overcome perennial lack of data (let alone quality data) to support effective decision making, particularly in developing economies. As a Site Verifier, you will be involved in our pre-employment screening by conducting a visit to our candidates’ residential address with the candidate’s consent letter. JOB DESCRIPTIONS: • Conduct the site visit to the candidate’s residential address • Conduct the basic verification of the candidate’s residence & reputation with the neighbors, head of the local community, police stations, building operators, etc. • Take pictures of the candidate’s residential address, as per Confirmis’ standard operating guidelines. • Provide observation about the address such as the location, the build...

I'm looking for an experienced Wikipedia writer to create an article about my trajectory and achievements as an actor. Ideally, someone who has written biographies or worked with subjec...ensure all data is accurate and up-to-date. - Chronological Storytelling: I want the biography to follow a chronological structure, covering my early life, career progression, and personal life. Skills and experience expected: - Strong researching and writing skills, preferably with an experience in biographical writing - Familiarity with Wikipedia's guidelines and article-writing procedures - Basic fact-checking skills and the ability to cross-verify sources. If you have any previous work samples, especially articles on the film industry or biographies, please feel free to share th...

...to , offering a clean and user-friendly interface that is tailored to the target audience of companionship seekers. - WordPress Expertise: The choice of CMS is WordPress, therefore the ideal candidate should be proficient in creating and customizing websites using this platform. - Language: The site will be in one language (Spanish) only, so fluency in Spanish is a plus. - SEO: Basic understanding of on-page SEO best practices is appreciated, though not mandatory. Ideal Skills and Experience: - Proficiency in WordPress theme and plugin development. - Experience with designing and developing websites in a similar industry (i.e., companionship services). - Ability to create a secure and user-friendly website that aligns with the specified requirements. Please feel free to

I'm seeking an experienced engineer/product designer that could build a 3-wheel E-Bike controller. This E-Bike controller should be capable of handling the following features: - Speed Control: The controller should have functionality to manage speed, with a maximum limit of 20 mph. - Battery Monitoring: The controller must include a system that allows for the continuous tracking of a Lithium-ion battery usage. - LCD Display: The controller should be equipped with an LCD display that visualizes the battery status and speed settings. It is essential the freelancer working on this project has experience in product design and engineering, with a strong familiarity in Lithium-ion batteries and how they function within e-bikes. Knowledge of LCD functionality is also necessary. Your...

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I need an Excel sheet that can help me analyze customer information for trends and patterns. This will involve: - Basic Formulas and Functions: The data room should have basic formulas and functions that allow for the easy manipulation and analysis of customer data. - Data Room Design: The sheet should be designed to be user-friendly and intuitive, making it easy for me to analyze the data without getting lost in the spreadsheet. - Data Analysis: The main goal of this project is to analyze the customer data for trends. So, the ideal freelancer will have experience with data analysis and the ability to create custom formulas to uncover patterns. - Attention to Detail: Accuracy is key in this project. I need someone who is meticulous and can ensure that all the data is ente...

I'm looking for a dependable Virtual Assistant with intermediate experience. You'll be tackling a variety of tasks, primarily: - Email management: Sorting, forwarding, and replying to emails on my behalf. - Calendar management: Scheduling, rescheduling, reminders, and confirming appointments. - Data entry: Input and update information into our databases accurately. Basic requirements for this role include: - Fluent in English: I need someone who can communicate clearly and effectively in English. It is important that my assistant understands tasks and can relay information properly. This role may require multitasking and fast-paced work, but I'm willing to work with someone who is keen on learning and improving. Having experience with these tasks will be a great ...

I'm seeking a meticulous freelancer for an efficient text transferring task. The project demands the precise copying and pasting of text content, but the exact quantity and source of the content is presently unclear. Newbies are preferred Ideal Skills: • Attention to detail - Fast Copy paste - Basic English Please note this role is ideal for new freelancers looking to establish their reputations.

...seeking to develop an educational game targeting elementary school students. This game should focus on teaching windmill mechanics. The entire project is already designed and modeled in Unreal 5.3, and ready to be shared with a game developer who needs to convert it into a video game for Android platforms and implement its mechanics. The user must have the ability to interact with the mill at a basic level, for example: open the main door, open and close windows (optional), press levers, and rotate the mill machinery. All of the model elements of the machinary are already integrated and ready to be interacted with. Some - interactions are optional because they depend on the complexity of their own mechanics. Just watch this video explanation (in english) of the mill:

I am looking for an expert in electrical design to assist me with a project I have. The scope and areas of expertise are quite broad and I'm open to input from professionals in the field. The ideal candidate should have experience in: - Circuit design - Power distribution - Control systems The end goal of this project is to maximize the efficiency of the electrical systems we have in place. This may involve improving energy efficiency, upgrading existing systems, or designing new systems from scratch. I'm looking for someone who is detail-oriented, has excellent problem-solving skills, and a good understanding of electrical engineering principles. The ability to work independently and communicate effectively is also key. If you have experience with similar projects an...

Sure, here's a condensed version of the project requirements for a React-based application: 1. **User Registration/Login**: - Allow users to register accounts with basic information. - Implement a login system for registered users. 2. **Task Management**: - Enable users to create tasks with descriptions, deadlines, and assigned employees. - Include predefined tasks and the option to create custom tasks. 3. **Timer and Deadline Tracking**: - Start a timer of 10 working days for each task upon creation. - Display countdown timers for task deadlines. 4. **Employee Dashboard**: - Provide a dashboard for employees to view assigned tasks, deadlines, and progress. - Allow employees to update task statuses and provide updates. 5. **Client Dashboard**: - ...

Setup Nginx on Plesk control panel with magento website Works fine with apache, we just need to change it to Nginx, you will need to set this up.

I seek a skilled developer who can convert a simple stochastic code from Pinescript to Thinkscript. The primary requirement is to maintain the same chart style in the Thinkscript as the original Pinescript. Key Requirements: - Basic understanding of Pinescript and Thinkscript is necessary. - Experience with translating code from one platform to another is desired. Please note: - The code is basic with a few variables, so the complexity level is low. - No comments are required in the code to explain the translation.

I need a skilled PowerPoint professional who is adept at working with PowerPoint 2016 and has a beginner level of proficiency in French. The task involves upgrading two of my business-oriented Power...business-oriented PowerPoint presentations. Ideally, you should have: - Experience with PowerPoint 2016 - Beginner French language skills - A sound understanding of business concepts Your role will be to deliver two upgraded business PowerPoint presentations, maintaining the original content, while enhancing the presentation with improved visuals, serviceable in French. Please note that while a basic command of French is preferred, the focus is on the business content. If you have relevant experience, kindly submit your proposal. Please only use the information and picture on the pd...

I need a skilled individual to assist me in completing Task 12 of the TryHackMe Windows Privilege Escalation arena. The task involves understanding the vulnerabilities and exploiting them to escalate privileges. Key require...understanding the vulnerabilities and exploiting them to escalate privileges. Key requirements include: - Experience with Windows operating systems, particularly in the context of penetration testing. - Prior knowledge or experience with TryHackMe or similar platforms for cybersecurity challenges. - Proficiency in identifying and exploiting vulnerabilities, especially those related to access control, file permissions, or services. Please note that this task needs to be completed as soon as possible. It's a fairly urgent project, so quick and efficient w...

I'm on the hunt for a fully seasoned full-stack developer comfortable with , Vue3, Vercel, EC2, DynamoDB, and S3. The primary obligations of this role will focus on: 1. Functionality Del...payment processing is a top requirement. 2. Market Focus: The application is catered towards retail customers. Therefore, a developer well-versed in building user-friendly, intuitive platforms would have a head start. 3. User Data Security: A basic level of security is key, as our platform will handle personal details—names and contact information. The ideal candidate should be comfortable working on a retail-customer focused app and have a proven portfolio displaying their proficiency in the key skills required for this role. Confidence with securing basic user information is...

...site. The selected individual will be primarily tasked with: - Document management: The organization, updating, and safeguarding of crucial documents. - Workflow automation: Streamlining business processes to improve effectiveness. - SharePoint site customization: Tailoring the site to suit our specific needs. At the moment, the specific SharePoint version being utilized is unspecified, so a basic understanding of multiple versions is beneficial. There's also a need to integrate Power Automate, so experience with this tool is essential. Ideal candidates must be proficient with SharePoint, organized, detail-oriented, and experienced in workflow automation and Power Automate. Below is JD Position Title: Functional Business Analyst 2- Run the Business (RTB) Reports to: Ent...

I need a pong game made with java, It needs to have some extra features such as a goal, sometimes when a player 1 scores a goal its dash to increase, variable ball speeds,

I am a certified firearms instructor and I'm in need of a scriptwriter who can craft a compelling script for a YouTube video series focusing on firearm laws by state. The target audience for these videos are firearm enthusiasts who have more than a basic understanding of the industry. I would like each state script to be an individual video 30-45 seconds long. Key Role Responsibilities: - Draft engaging scripts for each video in the series - Tailor content to suit a visual explanation-style presentation, aided by graphics - Ensure that the information provided is accurate, up-to-date, and comprehensible Ideal Skills & Experience: - Proven experience writing scripts, preferably for YouTube and the firearm industry - Deep understanding of firearm laws across the U.S states...

We are seeking an experienced web developer to create a dynamic and visually appealing website for our Mexican restaurant. The website will showcase our menu, location, and provide an easy way for customers to place orders over the phone, restaurant doesn't want online order. Additionally, we want to ensure that we have full control over the site, including all necessary credentials for future updates or changes. Create a responsive and user-friendly website design that reflects the vibrant and authentic feel of our restaurant. Implement features such as menu display, photo gallery, contact information, and an order form. Ensure compatibility across different devices (desktop, tablet, and mobile). Optimize the website for search engines (SEO) to improve visibility and attract m...

...professional who's experienced in Ubuntu Server, IONOS, and Plesk Control panel to assist with troubleshooting network services. Key Requirements: - Expertise in rectifying faulty server network configurations specifically linked to network settings - Strong understanding of Ubuntu Server, IONOS and Plesk Control panel This task requires attention to detail and an understanding of network configurations to successfully diagnose and remediate the server inconsistencies. Your expertise in this field will be invaluable in ensuring the smooth operation of my server. SideNote: After restoring Backup Image for IONOS hosting Plesk control panel. the VPS instance got disconnected from the network. We are able to SSH terminal through IONOS control panel but t...

...LATIN AMERICA only. I need close to EST time!! Furthermore, I need a BILINGUAL freelancer!! So READ before biding. I need a fully bilingual professional (I will interview in English via video) to do some tasks for my agency, such as: PR Outreach Social media Content editing or creating CRM management Email marketing Email scraping Researching Organizing data in spreadsheets Copywriting Basic Wordpress (change text, add a button, upload a file, etc) And others related to the position You must be a FAST learner, attentive to details, curious, with great writing skills. Looking for someone that pays attention and doesn’t keep making the same mistakes over and over. Attention to detail. Common sense. This job will part-time as a test period, after that it will be ful...

I need professional help to setup and configure a CentOS server. The server is meant for web hosting services and cPanel is the preferred control panel. Ideal qualifications would include: - Extensive experience in server setup and configuration - Proven skills in CentOS and cPanel - Aware of best practices for web hosting services Your responsibilities: - Install CentOS on the server - Setup the server for web hosting - Install and configure cPanel for use with the server

...user-friendly design that is in line with the purpose of the platform. - The site should be responsive and work seamlessly across different devices. - An intuitive navigation system that makes it easy for users to browse and interact with the platform. - Integration of essential features for a marketplace, such as user registration, product listings, search functionality, and secure payment processing. - Basic SEO optimization to ensure that the platform can attract and retain users. Skills and experience that would be beneficial for this project include: - Proficiency in web development with a strong portfolio of previous work. - Experience in developing marketplace platforms. - Ability to understand and translate a brand's vision into a functional and aesthetically pleas...

I'm in need of a SketchUp expert to complete a basic context model. This project is primarily for architectural visualization, so the focus is on creating approximate representation of the basic shapes and structures, using a google maps 3d import as a guide. I've set up the file, so it just requires the rest of the buildings to be modelled. Ideal Skills and Experience: - Proficiency with SketchUp. - Previous experience in architectural visualization projects. - Strong understanding of basic building structures. - A keen eye for detail and design aesthetics.

Confirmis's business model is designed to overcome perennial lack of data (let alone quality data) to support effective decision-making, particularly in developing economies. As a Site Verifier, you will be responsible for verifying a company’s existence through visual data by conducting a site visit to ensure that we provide reliable and accurate information to our client. JOB DESCRIPTION: • Conduct basic verification with the subject company’s authorized representative, such as line of business, key executives' names, etc. • Take pictures of the subject company and its vicinity, as per Confirmis’ standard operating guidelines. • Provide observation about the company to gauge activeness, e.g., staff working at the premise, loading/unloadi...

Confirmis's business model is designed to overcome perennial lack of data (let alone quality data) to support effective decision-making, particularly in developing economies. As a Site Verifier, you will be responsible for verifying a company’s existence through visual data by conducting a site visit to ensure that we provide reliable and accurate information to our client. JOB DESCRIPTION: • Conduct basic verification with the subject company’s authorized representative, such as line of business, key executives' names, etc. • Take pictures of the subject company and its vicinity, as per Confirmis’ standard operating guidelines. • Provide observation about the company to gauge activeness, e.g., staff working at the premise, loading/unloadi...

...webapp that faithfully mimics the infotainment menu of a Tesla Model 3 and Model Y. The webapp should be responsive, adapting seamlessly to both desktop and mobile platforms. Key Features: - Show the shortcuts and everything on the initial screen. The location, car color, battery and other params should be able to be set from parameters - Climate Control System: The webapp should have a user-friendly interface for adjusting the car's climate control settings. - Navigation System: Implement a detailed and interactive navigation system. It does not need to work 100% but feel and look like maps. - Battery Status: A central feature of the webapp should be the ability to view the battery status, and navigate to different sections of the menu with ease. Ideal Skills: - Pr...

I'm in search of an experienced and skilled developer who can create a remote desktop control application for Windows and Mac. Key Features: - WiFi Connection: The application should be able to function over a WiFi Connection. The program has to run in both windows and mac systems. The ideal candidate will have: - Proficiency in Windows and Mac application development - Experience in developing remote control applications - A deep understanding of networking and security protocols - Strong communication skills to understand the requirements and provide regular updates - Ability to troubleshoot and provide ongoing support if required If you have the right skills and experience for this project, please reach out with relevant samples of your previous work. I'm looki...

I'm in need of a MALE American voiceover artist to lend their skills to a 90 seconds video, for internal use (NO ADS, No social Media, just to show in their meetings) Key Requirements: - Professional tone: Your voice should carry authority yet remain approachable. A balance of formality and warmth is w...meetings) Key Requirements: - Professional tone: Your voice should carry authority yet remain approachable. A balance of formality and warmth is what I'm after. - American or neutral accent: As this is targeting an American and European audience, a native or convincing American accent is a must. Ideal applicants are those with previous experience in professional voiceovers and have excellent voice control. Your rate and a sample of your work should be attached to your ...

I'm looking for an experienced Wikipedia editor to create a page for my company. We already have a website so the information will be derived from there. The page should be a basic summary of the company, highlighting our key offerings and what distinguishes us in our industry. It should be well-researched and comply with all Wikipedia guidelines. The ideal candidate will have: - Proven experience in creating Wikipedia pages for companies - Strong research skills to extract relevant information from our website - Excellent writing skills to summarize the information in a concise and engaging manner - Comprehensive understanding of Wikipedia guidelines and policies If you have experience with similar projects, please provide examples of your work. Looking forward to heari...

The task at hand involves the creation of a comprehensive water services plan for a large-scale agro-industrial project . I already have a CAD floor plan and am in need of expertise for executing the water services part. This includes basic drainage, pipeline formation, fixtures in bathrooms, and a sprinkler system. The project also necessitates planning for an outdoor drip system within a greenhouse setting. Key skills and experience: - Proficiency in Auto-CAD - Experience in planning water systems for large-scale projects - Knowledge of both indoor and outdoor plumbing - Familiarity with greenhouse irrigation systems. This is an academic project therefore you have free reign over the specifics, DO you what you feel is the best option. I have put REV cloud over the areas in the C...

I'm currently seeking an experienced freelancer to build a SLAM system, leveraging Raspberry Pi 5, 2D Lidar and Arduino Uno/MKR 1010 WiFi as part of my college project. Key responsibilities will be to aid in motor control and visualizing real-time Lidar data. Specific requirements include: 1. Implement FastSLAM algorithm – You will need to have a thorough understanding and experience in implementing this particular SLAM algorithm. 2. Utilizing Python – All coding tasks should be performed using Python. 3. Deliver Real-time Lidar Data Visualization with: - Map Display: A real-time map should be drafted using the Lidar-scanned data. - Moving Trajectory: Display the accurate position and movement trajectory of the SLAM system. Having a background in...

Hi Freelancers, (URGENT) : need this Today ! I have a codecanyon script, please check it here : I need to use whatsapp only, don't need SMS feature, I have a VPS without control panel and I want to install it and make whatsapp works without any problem. Thanks Amine