Dual wireless transmitter receiver circuit työt
We are seeking a Jamaican (Male or Female, it doesn't matter) for a part-time cus...professional and punctual. * Training will be paid. Interested applicants MUST meet the following requirements - 1. Ability to speak English fluently. 2. MUST have experience with incoming Live calls and forwarding messages. 3. MUST have DIGICEL high speed internet of at least 15mbps download and 5mbps Upload or equivalent. 4. MUST have a fast and reliable computer with at least 4 to 8 gigs of RAM and a dual core CPU with clock speed 1.9Ghz or higher. 5. MUST be available to work flexible schedule on EST (Eastern Standard Time) 6. MUST own a tablet or laptop and noise canceling call center style headset and have a extremely quiet workspace. Interested applicants apply if you meet the requirem...
... - WiFi 801.11b/g/n up to 150Mbps and simultaneous AP and Station modes - Bluetooth 4.2 Class 1 supporting BR/EDR and LE dual-mode - Multi-constellation GNSS receiver with built-in high-gain antenna - High-efficiency switching power supplies for low temperature operation - Over-, under-, and reverse-voltage protection exceeding automotive standards - ESD protection exceeding automotive standards - Full-color RGB LED for status indication - Dual-core 32-bit Tensilica processor at 240MHz - Built-in J1939 Type II 9-pin connector supporting both new and legacy vehicles - Physical layer and protocol auto-detection/auto-bauding - Dual-wire CAN interface supporting 1Mbps - Dual-wire J1708 interface - J1939 protocol support - ISO 15765 and ISO 14229 (OBD-II) p...
I am looking for a skilled developer to create a home page for my wireless services website using WooCommerce and Elementor. Purpose: - The main purpose of the website is to sell products. Specific Elements and Features: - I would like the home page to have a slideshow of products, showcasing different wireless devices and accessories. - Additionally, I would like a contact form that allows visitors to easily get in touch with me for inquiries or support. - Lastly, I would like to include testimonials from satisfied customers to build trust and credibility. Ideal Skills and Experience: - Proficiency in WooCommerce and Elementor is a must. - Experience in designing and creating visually appealing home pages with engaging slideshows and contact forms. - Knowledge o...
I am looking for an experienced electrical designer who specializes in industrial power projects. We have detailed specifications and templates of a former generation of the product drawn in AutoCad, and need someone who is familiar with E-Plan software to make specified adaptations to the circuits and to create the functional circuit diagrams (SLD, MLD, sigal wiring, comms), terminal diagrams, arrangement diagrams and BoM . The deadline for project completion is 15/01/2024. Ideal Skills and Experience: - Strong knowledge and experience in electrical design for industrial power projects or switchboards - Proficiency in using E-Plan software andf all it automated functions - Ability to analytse, undersartnd and complement detailed specifications and ensure all requirements are met ...
Send me message firstly please to discuss the details. I am seeking an ethical hacker with expertise in web application security. The project entails both assessment and solution implementation. I am open to any programming languages and tools that the freelancer is proficient in. The ideal candidate should have a strong understanding of web application security and b...expertise in web application security. The project entails both assessment and solution implementation. I am open to any programming languages and tools that the freelancer is proficient in. The ideal candidate should have a strong understanding of web application security and be able to effectively identify vulnerabilities and provide solutions to mitigate risks. Experience in network security and wireless security ...
I am looking for a skilled freelancer to help me create a Gerber file for an ASIC miner board with customizable mining capabilities. The board should be able to mine Bitcoin using common software. Skills and experience required: - Strong knowledge of ASIC miner board design and development - Expertise in creating Gerber files for electronic circuit boards - Familiarity with Bitcoin mining and common mining software - Ability to customize mining capabilities based on specific requirements The project has a specific deadline of one week, so the freelancer should be able to complete the task within this timeframe. The ASIC miner board should have general software compatibility, meaning it can work with a variety of software options. If you have the necessary skills and experience, ...
...design a circuit that can read an angle from a CJMCU-103 or similar sensor and display it as only one illuminated LED in a strip of 41 LED's. The circuit should have the following features: Sensor: MPU-6050 or similar angle sensor. Resolution: The desired resolution for the angle measurement should be adjustable via a trimpot. Alternatively if it is done using an arduino or something similar, we need the ability to set a resolution as our row of LED's will be along side a scale that shows the mm of tilt on the length of the device. LED's: A row of 41 individual LED's in Varying colours (green, yellow and red) Calibration: A second trimpot for adjusting the "zero point" once it is installed in the device. Skills and experience required fo...
I need a flyer AND a website banner for a Christmas sale. The banner size needs to be 1920px * 450px. Normal size for the flyer. My website is If you would like ...image with our contact information as well as a couple of options for our logo. I am also including the a sample flyer and banner from our Black Friday sale. I will need this in a fully layered PSD, PNG, JPG, PDF Looking for a fast turnaround please.
Can you please just look at the potentiometers on this site and see if any would work as alternatives for the digital potentiometer you put in my circuit? (MCP4251T-503E/ST)
Dear Dave W As a seasoned electronics engineer with expertise in designing and implementing transistor circuits, I am excited to offer my services in developing a simple circuit that can be used to light an LED with a 1.3V base voltage and a 9V collector-emitter voltage. I am confident that I can design a circuit that meets your specific needs and requirements. I will work closely with you to understand your application and ensure that the circuit is safe and reliable.
Project Title: PCB Design Overview: I am looking for a skilled PCB designer to create a circuit board for my project. The design should be simple, with a moderate size and should incorporate some specific components that I already have in mind. Requirements: • PCB Complexity Level: Simple • PCB Size: Medium • Specific Components: I have some components that need to be included in the design, but not all. Ideal Skills and Experience: • Extensive experience in PCB design with a focus on simplicity and efficiency • Proficiency in using PCB design software (e.g., Altium, Eagle) • Strong knowledge of circuit design principles and best practices • Familiarity with selecting and integrating specific components into the PCB design • Ability...
I am looking for a skilled circuit designer who can design a filter circuit on Multisim. The specific requirements for the circuit design are provided, as I have specific parameters that need to be met. The desired frequency response for the circuit is a low-pass filter. Skills and experience required for this project include: - Proficiency in circuit design using Multisim - Knowledge of filter circuit design principles - Understanding of low-pass filter concepts and frequency response - Ability to meet specific parameters and design requirements
I am looking for a tax professional to assist me in filing my personal taxes. Also file US taxes. I am a dual citizen and I am claiming Apple stock dividends as well . Here are the details of my project: Filing Status: - I am single, so the ideal tax professional should have experience in filing taxes for individuals with a single filing status. Dependents: - I do not have any dependents, so the tax professional should be knowledgeable in handling tax returns without dependents. Special Circumstances or Deductions: - I am not sure if I have any special circumstances or deductions, so the tax professional should be able to analyze my financial situation and determine any potential deductions or special circumstances that may apply to my tax return. Skills and Experience: - Experi...
I am looking for a skilled engineer to design a hydraulic power pack and hydraulic circuit for my project. The project requires the following specifications: Power Capacity: - The hydraulic power pack should have a power capacity of less than 10 horsepower. Hydraulic Circuit: - The hydraulic circuit should be a closed loop system. Operating Pressure: - The desired operating pressure for the hydraulic system is between 1000-5000 psi. Ideal Skills and Experience: - Experience in designing hydraulic power packs and hydraulic circuits. - Knowledge of closed loop hydraulic systems. - Ability to work with operating pressures between 1000-5000 psi. If you have the expertise and skills required for this project, please submit your proposal.
...specifications: Voltage Range: - The desired voltage range for the alarm is 0-5V. Functionality: - The alarm should be able to warn of both voltage rise and drop. Power Supply: - The alarm will be powered by a battery. Ideal Skills and Experience: - Strong knowledge of analogue circuit design. - Experience in creating voltage alarms. - Proficiency in selecting appropriate components for battery-powered devices. - Familiarity with voltage monitoring and detection systems. - Ability to design a compact and efficient circuit that meets the specified voltage range and functionality requirements. This is the alarm system for my patent The problem: I have a 50 watt amplifier that creates a parasitic oscillation that needs to be measured. The oscillation can be measured on a...
...required for application of force on top of a metallic beam and measurement of beam’s bending by using a resistive strain gauge attached on the beam. Both quasi-static and slow dynamic loading cases should be measured. THE PROBLEM THAT MUST BE SOLVED: In the weblink below is the code and schematics used for measurement of a strain gauge (MMF006835) with Arduino. After setting up the circuit (amplifier used in a circuit is INA125P) and using the code itself, the output received from the Arduino is not logical. Output does not change properly when the force is applied to the metallic beam (i.e., strain gauge) itself. Here is the weblink with a breadboard diagram and initial read & display example code: If you have the necessary
We need a PCB design and 3 manufactured prototypes of a small clock circuit board (~4 cm x ~3 cm). The output frequency is 52 Mhz to be driven by the SiT5358 VCTCXO, which can be purchased online at SiTime. Operating temperature range is 0 to 70 degrees C. A POTS trim adjusts the VCTCXO with +/- 6.25 PPM. The board should include 3 mounting holes for 4-40 screws, with any layout. The circuit board output connector will be SMA female with 50 Ohm impedance and ~0.6 V peak-to-peak square wave output. The supported power input should be DC 10 - 15 V input using a Molex 3-pin standard PC fan male connector (with pin 1 ground and pin 2 providing ~12 V input.) The project includes delivery of the manufactured prototypes, as well as schematics and gerber files. We propose paymen...
Rekisteröidy tai kirjaudu sisään nähdäksesi tiedot.
You need to type from the given image into a Word file that has a specific format. Images have questions, answers & solutions you need to type them in the given Word file (take a look at the sample file). These files are for an online test series for Electrical Engineering so there will be mathematical equations, circuit diagrams, graphs, etc. The Word file needs to be uploaded on an educational app so please follow the given format strictly. Each file contains 25 tables (as shown in the sample file/image). Take a look at the sample file/image & format. If you have any doubts or want more details on the project, we can discuss it over chat.
In this project, student need to design and analyze the performance of dual-frequency AMC with ring shape. The AMC structure should achieve high bandwidth for 0.92 and 2.4 GHz frequency. Expected Outcomes To analyze the performance of ring shape AMC. To design the ring shape AMC with acceptable bandwidth for UHF and HF GHz frequency To evaluate the performance of simple RFID tag with AMC on different metal properties.
I will complete Step 1 to Step 3 of the file provided. Step 1: programming a device (ESP32) as a transmitter and another device (ESP32) as a receiver. Step 2: the transmitter continuously transmits beacon frames over different sub-carriers which are modulated through any modulation technique with a specified frequency, amplitude, and phase and the receiver receives the signal and be able to extract the received frequency, phase, and amplitude of the received signal. Step 3: live visualisation (plots) of the changes in frequency, phase, and amplitude over different sub-carriers.
... I am not sure if I want the logo to incorporate any specific symbols or images related to my business, so I would appreciate suggestions from the designer. One logo idea that combines lashes with a subtle nod to technology could be to create an abstract representation of eyelashes that incorporates sleek, modern lines or geometric shapes. play with the idea of digital elements, such as circuit-like patterns or pixelated accents, to give it a tech-inspired twist. The key is to strike a balance between the elegance of lashes and the subtle incorporation of technology to create a unique and visually appealing logo for Lash Tech. Ideal skills and experience for the job: - Experience in creating logos for beauty or technology-related businesses - Strong understanding of mo...
I want to create a classroom-based communication tool for use in Korea, as well as a cross-platform app to play a simple board game. 1. use google firebase or amazon aws for server 2. create a webpage for teachers and an app for students 3. the app for students will display multiple sub-apps in the form of an app drawer 4. Sub-apps for students are like a. Calculator b. Message receiver (teachers can send it) C. 3D Dice e. Pomodoro Timer 5. Sub-games can multiplay in classroom a. Tictactoe B. Fast Pushbutton c. Lumicube d. 2048 E. And also simple games are like WePlay 5. Teacher pages A. allow you to set names and numbers for your students. B. you should be able to send individual or group messages to students. C. You can check students' scores. D. You can tempora...
Convert the 'BOM_PCB_FLexGauge..." to the format of "bom_template_nextpcb" so that it is compatible with ""
Urgent project to be release. Creating a laravel datatable website with function as per below: 1. Login: primary and secondary login (based on function and limit) 2. Datatable: extract data from database and pop-out in the website, dual-way update in required where any CRUD operation occurs, it should reflect to CRM and Laravel datatable 3. On the datatable, it require to have date on the next payment update (will provide info later). 4. Analytics: this website meant to internal usage, so analytics to track the worker productivity and any act of CRUD operation can be detected. 5. Proper structure: coming with good impression website with a good function is highly recommended. Looking forward for the master of laravel website technical design to take this project. Project T...
Project Title: Design my Power Wall energy product! I am looking for a talented mec...with the front cover removed and attached to the wall is attached for inspiration. The front cover needs to be removable for for access to the internals for electrical wiring and installation, and the design needs to be as highly IP rated as possible considering there must be louvered filtered venting on the left and right sides for product air cooling. There are 4 x power modules inside, and circuit breakers in the top area for connection. Skills and Experience Required: - Proficiency in mechanical design/CAD software - Strong understanding of clean and minimalist design principles - Strong understanding of design for manufacturing principles and cost optimisation practices Size: 1300mm x 630...
...an electronics project where a large matrix of solenoids need to be controlled almost simultaneously using just an Arduino Nano/relevant micro controller. I have a rough idea on the components and circuit to be used but want an experienced person to determine the components based on the specifications, perform simulations and print the PCB ,determine wiring according to the various constraints and 3d models we have. Also , I need some code written to drive this circuit based on desired input. We have a tight timeline so we have to start working on this immediately I would prefer if this circuit can be tested physically as well. Looking for someone who can work collaboratively and is dedicated to seeing that a physically functional output as desired is reached. It...
I need a simple circuit using common hardware parts that measures the high width of a TTL pulse and if it exceeds 3 seconds a logic output is set high as an alarm. If the pulse becomes shorter than 3 seconds the logic output is set low so alarm is turned off. A 32768Hz clock is available. Maybe a 74HC series binary counter might work. Or specify your own clock generator. We want simple 74HC logic, or 4000 logic. Not MCU and not FPGA. When we choose the circuit we will build it to confirm it works before awarding prize.
...to use in the design (PDF and Excel) 4. Summary guidance on routing/layout to eliminate thermal or EMI pitfalls Skills and experience needed for this project shall include: - Extensive knowledge of KiCAD or Altium - Extensive knowledge and (ideally prior) experience with Raspberry Pi Hat design - Knowledge of PoE functionality and implementation - Solid understanding of electrical engineering circuit design The ideal freelancer for this job should be able to design and develop a Hat that combines PoE functionality and solenoid control while ensuring it fits within the specified space. There will be an initial design review of the freelancer's progress and a final review of the work product before acceptance of the project deliverables and payment. If you believe that you...
Hello We are looking for someone who can create a ...notification options Message reactions One-time viewable media Stickers Buy phone number anonymously (Twillio) Keyboard shortcuts for Messenger Desktop Navigate to "Settings" Tip indicators Messenger Android statistics Link previews Screen protection Unpair devices How do I know if my message has been delivered or read? Paired devices Delete messages, notifications and conversations Leaving a group Dual SIM Invite friends Block phone numbers or groups Read receipts Secret PIN Back up and restore messages Screen lock View and save all media content or files API, payment option, sending money by phone and bank transfer and you have to be able to pay with it. you still have to do the design Please send us IOS references i...
Project Description: OBD2 Scanner Programming I am looking for a skilled programmer to develop a software program for my wireless OBD2 scanner with 4G support that is primarily intended for vehicle diagnostics. I am open to suggestions for the specific programming language to be used, but it should meet the following requirements: Features: ➢Users to set a speed limit in the vehicle by using the mobile application if another person is using their vehicle to avoid rash driving. ➢ Access the vehicle in built sensors such that it can detect obstacle earlier and deploy the electronic braking system to avoid accidents. ➢ Automatic reverse braking to avoid collision when reversing ➢ 4G cellular connection with which if the vehicle is met with an accident, the device will send alerts to ...
...Crystal Window shows which monsters you need to hunt and which Soul Crystal you need for your weapon Item Search window allows you to find every possible source of getting item that you are interested in Offline Private Store Sales premium or vote boosting runes, Player can buy on webstie or vote on server. Shadow weapons and D/C coupons are enable Ranking Window Automatic Crystallization Sales No Dual Box No Auto Pick Up Seal Stones drops are evenly split between party members Sieges every 2 weeks. Ad2. MODERN GAME CLIENT: Modern look of the game Improved performance No Critical Errors Tons of new Game Settings and Interface Windows Damage on the Screen Healths Bars Mail Radar Skill Learning Panel Items on Chat Npc Debuff Info Improved Clan Notice Editing Quick Status Actions E...
...dependencies or prerequisites required for the software - Troubleshooting tips or solutions for common issues that may arise I don't care if this uses WSL, Docker, Anaconda, A VM etc. I mean if you want you could dockerise it and then provide a 2 line set of instructions. I don't care as long as it works, and as long as it's using the ROCm to speed it up. The only thing I don't want to have to do is a dual boot or buy special software. If I gotta download some free software that's cool as long as it's not some malware crap. Special Note: I have spent moths trying to get this to work. I'm pretty tech savvy but I'm not a programmer, and so I realize I'm in over my head, and the worst decision I have ever made more ways than one, was ...
The task involves designing a synchronous counter circuit using the SN74LS175 module to generate a specified number sequence. The circuit must be asynchronously resettable and display the output using a seven-segment display. There should be no switching network between the D flip-flop outputs and the seven-segment decoder inputs. The counting sequence is realized through a switching network at the D flip-flop inputs, determining the next state based on the current states. Testing can be done using a provided seven-segment decoder and display in the laboratory. In Logisim, use the 'Hexadecimal Display' element for counter state visualization, as it already includes the seven-segment decoder.
I am looking for a skilled designer who can create a Kunafa Dual Stove and Sheet Metal cover design for Kunafa cooking purposes. The ideal candidate should have experience in creating functional and aesthetically pleasing designs for kitchen appliances. Requirements: - The stove should be small in size, perfect for small kitchens or outdoor cooking. - The main feature that the stove should have is adjustable heat, allowing the user to control the temperature for different cooking needs. - The design should also be portable, making it easy to move and store when not in use. - It would be a plus if the stove has a built-in thermometer, providing accurate temperature readings for precise cooking. Skills and Experience: - Experience in designing kitchen appliances, particularly stoves...
Project Title: Mixed Circuit Design I am looking for an experienced circuit designer to create a mixed circuit for my project. The circuit will require both analog and digital components. Application/Functionality: - I do not have a specific application or functionality in mind for the circuit. I am open to suggestions from the expert. Level of Complexity: - The circuit design should be of moderate complexity. Ideal Skills and Experience: - Strong knowledge and experience in mixed circuit design - Proficiency in both analog and digital circuit design - Ability to suggest and implement suitable applications or functionality for the circuit - Understanding of moderate complexity circuit design principles and techniques
I am looking for an electronics designer to help me with a project involving the development of a medicine pill dispenser. Specific Requirements: - I have specific requirements for the electronics design that need to be met. Intended Purpose: - The electronic design will be used for research and prototype development purposes. Ideal Skills and Experience: - Experience in PCB design, circuit design, and firmware development - Knowledge of medical devices and regulations - Ability to meet specific requirements and adhere to project timelines - Strong problem-solving skills and attention to detail. If you have the necessary skills and experience, please reach out to discuss the project further.
I am looking for a freelancer who is skilled in working with microcontrollers and LED lighting for a custom lighting project. I have a specific design in mind for the LED lighting, but I am open to suggestions. The project will involve using an Arduino microcontroller. The main purpose of the lig...functional and decorative lighting. We want people to work from our office. Our office is based in Chennai, India. Ideal skills and experience for this job include: - interest in programming microcontrollers, specifically Arduino - Experience in designing and implementing LED lighting systems - Creativity in suggesting alternative LED lighting designs - Knowledge of electrical engineering and circuit design - Attention to detail in ensuring the functionality and aesthetics of the lightin...
I am looking for an experienced freelancer who can help me fault find a Printed Circuit Board (PCB). The main issue I am experiencing with the circuit board is that I am having power issues, connection issues, and component issues. Skills and Experience: - Deep understanding of circuit board design and troubleshooting - Proficiency in diagnosing and repairing faulty circuit boards - Excellent knowledge of electronic components and their functions - Ability to explain and teach how to diagnose faulty boards Deadline: - The project needs to be completed within 1 month.
Analog Circuit Simulation Project I am in need of an experienced freelancer who can assist me with an analog circuit simulation project. The project requires expertise in AC, DC, and transient analysis. Specific Requirements: - Ability to conduct AC analysis, DC analysis, and transient analysis for the circuit - Familiarity with LTSpice software for the simulation - Experience in designing and simulating analog circuits Ideal Skills and Experience: - Proficiency in LTSpice software - Strong knowledge of AC, DC, and transient analysis techniques - Previous experience in designing and simulating analog circuits - Attention to detail and ability to troubleshoot circuit simulation issues If you possess the required skills and experience, and are familiar with LT...
<Overview> Please collect product information on vehicles or service information that have or will have the technologies described in the “Technology Description” section below. <Technology Description> This technology is used for updating vehicle software using OTA technology (OTA is a technology that uses wireless communication to transmit and receive data). The software installed in a vehicle is generally executed using the values set or learned uniquely for the vehicle (examples of the values: the operating mode designation, the user's preferred air conditioning set temperature, etc.). These set and learned values must be processed so that they can be used even after the software is updated. To solve these problems, this technology writes a new v...
I am looking for a freelancer who can assist me with the PC...involves the following requirements: Size of the PCB: Medium (up to 10cm x 10cm) Components: I have a list of specific components that need to be incorporated into the PCB. Layout preference: It's up to the designer to come up with the best layout for the components. Ideal skills and experience for this job include: - Proficiency in using EasyEDA for PCB component layout - Knowledge of different circuit board sizes and their limitations - Ability to work with a list of specific components and integrate them into the layout - Creativity and problem-solving skills to come up with an efficient and functional layout - Good communication skills to understand any requirements or constraints and provide input and advic...
Rekisteröidy tai kirjaudu sisään nähdäksesi tiedot.
Hello! Thanks for checking this job posting. PLEASE GO THROUGH THIS ONCE BEFORE RESPONDING. First of all, you need to answer if ESP32 can handle this operation. We are looking for converting the normal USB based thermal printer to a wireless printer. We need the ESP32 to show up as a wireless printer on the network to all the mobile devices connected to the network. Once the user sends some file for printing to this wireless printer, the ESP32 recieves this file and transmits this file to the webserver, where we do some modifications to the file. The modifications include AI based cropping to keep only the necessary material and creates a new file which this server will send back to the ESP32. Once the ESP32 recieves this modified file, it will then send a pri...
...experienced Arduino designer to develop a custom board that can seamlessly integrate both dumb waiter control and "Alexa" functionality. This project requires an intermediate level of complexity in the control system and a wired connection for communication between the Arduino board and the dumb waiter system or "Alexa". Ideal Skills and Experience: - Strong proficiency in Arduino programming and circuit design - Experience with dumb waiter control systems and "Alexa" integration - Knowledge of wired connection protocols and communication methods - Ability to troubleshoot and debug complex control systems - Attention to detail and ability to meet project deadlines If you have previous experience in designing Arduino boards for similar projects and ...
...with extensions to Python ) - The ideal candidate should have experience in programming the temperature sensor using Arduino Accuracy: - The client already has a certain accuracy for the sensor for NTC Thermistor. Skills and Experience: - Proficiency in Python, Arduino programming language - Experience in working with temperature sensors and NTC Thermistors - Knowledge of electronics and circuit design - Ability to troubleshoot and debug sensor-related issues - Future projects with Setup Please provide examples of previous projects or relevant experience in temperature sensor programming and electronics. Budget is various from 20-30 CAD for the first project 40$ for shutoff mechanism for Laser Others will be determined later NOTE : There will also be tips at the end o...
Looking for a freelance to help promote and sell wireless internet in the United States. Prefer to find Commission based work and willing to payout for each sale made and willing to offer monthly residual income, want to pay for results! Checkout , if interested let me know what you can offer.
I am looking for a skilled freelancer who can design an analog circuit with fusion 360 electronics. The purpose of the circuit is to generate an analog output signal -10 to +10V and 0 to 20mA from a DCA outptu 0..3.3V, and it should have high precision. The desired size or form factor of the circuit is medium-sized. Skills and experience required: - Strong knowledge and experience in designing analog circuits - Proficiency in using fusion 360 electronics - Ability to design circuits with high precision - Familiarity with medium-sized circuit design and form factors German is a big plus!
Create wordpress website from scratch to do the following 1- employees sends files or questions to receiver 2- receiver see and download the file or question then put status and response 3- after status and response to delete file automatically 4- dashboard 5- if file have expiry date then the website should automatically notify when expired and need to reupload the file
