Solar arduino wireless sensorJobs
...unable to update firmware remotely, the OTA process is not reliable and the encrypted firmware updates are failing. - **ESP32 Background Information:** I'm using an ESP32 Development board for this project. The application running on this hardware was developed using Arduino. - **Necessary Skills Most Needed:** A freelancer with advanced knowledge of ESP32 and an understanding of the OTA process including familiarity with encrypted firmware updates will be best suited to tackle this issue. Proficiency in Arduino is also necessary. Given that this project deals with the inability to update firmware remotely, familiarity with networking would be an added advantage. Connecting to XXX W (84) wifi: wifi nvs_open fail ret=4353 E (84) wifi: wifi_init 1410 ret=...
skal bruge færdigt projekt til: wifi data. sende en e-mail når en knap aktiveres der skal tilkobles 2 knapper der skal send forskellige beskeder der skal bruges dns da ip ændre sig skal kunne modtag data til at tænde led skal kunne gemme data hvis forbindelse svigter og sende når der er forbindelse igen
...landet. Malawi er et lille og meget fattigt land med stor social forskel og mange problemer. Vi har efter mange aars kamp faaet gang i Sol-drevne borehuls vandpumper og nu er tiden kommet til Grundfos CRFlex Surface sol-drevne pumper til Small-holders in agriculture. For at minimerer mulighederne for fejl installation taenker jeg paa at lave nogle simple standardiserede kits med disse surface solar drevne pumper (4 forskellige) for at faa en vis for for economy of scale in over. Jeg kunne godt forestille mig vi samlede disse kit her i Malawi. Malawi har forholdsvis meget overflade vand tilgaengeligt med forholdsvis meget "flat" landbrugs land direkte tilganegeligt. Har du kunnen samt lyst til at hjaelpe os med at for dette sat paa "papir og skinner" ? (jeg h...
...allow ticketing based entirely on automatic unattended image processing. While the proposed system only partly reduces the manual control, it will reduce the amount of sign in /sign out equipment on platforms and placing that equipment entirely in the rolling stock. Each train compartment or bus is already equipped with a wireless LAN connected to the InterNet. The train or bus computer knows the current position (GPS). A passenger simply associate with the wireless network as usual but for those passengers that have registered for an electronic ticket service the train computer now registers boarding and during the journey registers position either based on time intervals or passing of taxation borders. On active disassociation or by just leaving the train or bus t...
...allow ticketing based entirely on automatic unattended image processing. While the proposed system only partly reduces the manual control, it will reduce the amount of sign in /sign out equipment on platforms and placing that equipment entirely in the rolling stock. Each train compartment or bus is already equipped with a wireless LAN connected to the InterNet. The train or bus computer knows the current position (GPS). A passenger simply associate with the wireless network as usual but for those passengers that have registered for an electronic ticket service the train computer now registers boarding and during the journey registers position either based on time intervals or passing of taxation borders. On active disassociation or by just leaving the train or bus t...
I would like to creat door hangers two sided with this information Energy savings program “ Available in this zip code! Products include: Roof Tankless water heater Turf Electric panel upgrade Exterior paint Solar Windows Insulation HVAC Payment plans as low as $99 a month $0 money down Call today to get prequalified for programs and incentives available to homeowners only Representatives available for free assessment in your area call today to schedule appointment And make it in red colors that pop
...the majority of our visitors using mobile devices, a crucial part of the redesign is to ensure that our website is mobile-friendly. Please note that I have an example of website designs we admire and these will be shared for inspiration and better understanding of our aesthetic preferences. I also would be able to purchase the theme and send it to you! Important: * Website should be done on an external server or similar so that our website will not be disrupted and later uploaded * Not all pages
I'm in need of a skilled individual who can design a system that effect...Detection Range: The system should be optimized for short-range detection, around 10 meters. This will allow for timely warnings and preventive actions against potential accidents. Ideal Skills and Experience: - Proficiency in sensor technology, particularly laser sensors - Prior experience in designing safety-related systems - Knowledge of power lines and the potential dangers associated with them - Strong problem-solving skills to ensure the system is reliable and effective. If you have a track record of creating similar safety systems or have the necessary expertise in sensor technology, I'd be interested in hearing your proposals. Please include samples of your previous work related to t...
I have Arduino code and a svc model and I’m using a application called Blynk for visualization I want to send the reading of the moisture sensor to the svc model as an input for prediction and send the prediction back to the Blynk or Arduino so if the output is 0 it stop watering and if its 1 it start watering
I have Arduino code and a svc model and I’m using a application called Blynk for visualization I want to send the reading of the moisture sensor to the svc model as an input for prediction and send the prediction back to the Blynk or Arduino so if the output is 0 it stop watering and if its 1 it start watering
Setup: 6 amp Stepper Motor With External Micro Controller. Two Buttons (switches) Desired Action: Press and release button #1 motor CW, accelerates and travels to an assigned location, decelerating to a stop. Pressing this button a second time will stop the motor. Press and release button #2 motor CCW, accelerates and travels to an assigned location, decelerating to a stop. Pressing this button a second time will stop the motor.
More details: What type of communication method would you like the smart watch kit to use? GSM Do you want to send only text messages or multimedia messages as well to the smart watch? Only text messages What type of phone will you be sending messages from to the smartwatch? iPhone All I require is a code which enables me to send messages from my iphone 11 onto this Arduino board.
For my project, real-time voltage levels tracked through an ATSAMD21 MCU will be crucial. I need someone who can develop firmware to transport this crucial A/D data to a host computer via USB in a raw format. This endeavour calls for: * Proficiency in crafting firmware for ATSAMD21 MCU * Proficient understanding of voltage/current monitoring systems including TI INA3211 i2c sensor * Ability to transport raw A/D data via USB * Experience in real-time data monitoring solutions. Your role would be to focus on developing a robust and efficient real-time monitoring system to track voltage levels and send this information in raw format to the host computer. Your expertise will ensure that accurate and reliable voltage info is readily available for further processing and analysis.
I am seeking an entity with expertise in ESP32 programming, specifically having an in-depth understanding of RTKLIB's implementation and RTCM conversion. The task includes: - Coding, making the ESP32 project work in coordination with the RTKLIB to function optima...Services) code conversion is needed. Particularly converting RTCM messages 1005, 1077, 1087 to 1006, 1004, 1012 and adding 1033 - The ideal candidate for this project needs to be familiar with the RTK rtcm and how to utilize the 'TADJ = 1' variable in the RTKLIB to enhance positioning accuracy and aid in correcting transmission errors. If you have the skillset, including an understanding of sensor data processing and receiver clock adjustments, please apply. Prior experience with positioning system deve...
I'm seeking the expertise of a professional ethical hacker who specializes in: - Network security - Web application security - Wireless security Unfortunately, I forgot to mention whether I need penetration testing, vulnerability assessment, or both. I also didn't specify the exact purpose of this ethical hacking project. Ideally, you should possess a strong ability to uncover any underlying vulnerabilities and offer strategic direction on how to heighten security measures across different platforms. Your approach should not only identify these weaknesses but also provide solutions on how to rectify them. While it's not specified, it'd be beneficial if you could also assess the effectiveness of existing security measures and provide recommendations for impro...
...Tirupati Hyderabad Nizamabad Medak Nalgonda Khammam Ratnagiri Aurangabad Latur RF Engineer/ Rigger Responsibilities: • Ensuring RF test equipment is calibrated to industry standards. • Testing, cleaning, and packing field equipment. • Traveling to customer locations and field sites. • Testing the performance of existing wireless networks. • Analysing RF broadcasting equipment and suggesting improvements. • Using computer software to design RF installations for new wireless networks. • Troubleshooting network issues. • Ensuring regulatory standards are met. RF Engineer Requirements: • Bachelor's degree or Diploma in electrical or Electronics engineering • 1-3 years' experience as an RF engineer in the mobile tele...
...Tirupathi Hyderabad Nizamabad Medak Nalgonda Khammam Nagpur Ratnagiri Aurangabad Latur RF Engineer/ Rigger Responsibilities: • Ensuring RF test equipment is calibrated to industry standards. • Testing, cleaning, and packing field equipment. • Traveling to customer locations and field sites. • Testing the performance of existing wireless networks. • Analysing RF broadcasting equipment and suggesting improvements. • Using computer software to design RF installations for new wireless networks. • Troubleshooting network issues. • Ensuring regulatory standards are met. RF Engineer Requirements: • Bachelor's degree or Diploma in electrical or Electronics engineering • 1-3 years' experience as an RF engineer in the mobi...
I am in search of a proficient virtual assistant who is adept at listing products on Wix and Shopify. Your primary task will be to...Experience with product photography or digital photo editing is an advantage - download product images and editing to the theme and layout of our website - Come up with product names, product description that is SEO optimized - Work closely with founder to fix price and work on website Required: - A desktop, Laptop that does not lack - Video Call capability that is clear - A stable and reliable wireless connection Having familiarity with the fashion industry would be ideal. This role requires a diligent professional who understands the dynamics of online marketplaces, to ensure our products are accurately and attractively listed to drive customer e...
I'm in need of an Arduino ESP32 BLE Beacon that can help me locate my position. Its key function will be to triangulate its position based on three central beacons in an indoor environment. Key Requirements: - The main goal of this project is to create a beacon that allows me to know my position inside indoor spaces, such as offices and warehouses. - The system should be designed to provide a medium level of precision in position tracking, with an accuracy of up to 5 meters. Ideal Skills and Experience: - Proficiency in Arduino and ESP32, with a strong understanding of BLE (Bluetooth Low Energy) protocols. - Prior experience in designing and developing beacon systems for positioning. - A solid understanding of indoor positioning systems and the challenges they may p...
In this exciting project, I'm looking for a freelancer gifted in system integration to apply Arduino-powered robotics interfaced with IoT devices. Your role includes: - Implementing well-structured Arduino programming concepts dedicated to robotics. - Leveraging your strong background in system integration. - Using your extensive experience with IoT devices to smoothly integrate them with the Arduino robotics. A working knowledge of robotics design and construction is beneficial, but not necessary. Only those with proven experience in similar projects, particularly involving Arduino and IoT interconnection, should apply. I'm excited to see your creativity at work on this project.
...ready, into an existing C++ codebase designed for ESP32 arduino. Here is the specifics: - Integrate user authentication functionality, file input/output, and error handling into the previous codebase. - Implement RTCM messages code for real-time positioning corrections, data integrity checks, and network communication. The successful candidate will ideally have the following skills and experience: - Proficiency in C++ programming, including libraries and message coding. - Extensive understanding of RTK library and RTCM messages. - Experience with ESP32 Arduino. - Strong troubleshooting and problem-solving abilities. The original code is completed. All you need to do is adjust and ensure its seamless operation with the ESP32 Arduino code. Your work is vital in e...
I own a bathroom LED mirror business and need a talented graphic designer to create an engaging infographic image. This image will be used to market my products and educate potential customers. Key Points: - The infographic should emphasize the unique selling points of our LED mirrors, such as the built-in IR sensor, copper-free mirror, energy efficiency, and more. - The design should be visual, easy to understand, and suitable for a broad audience. - It's essential that the image is captivating and encourages viewers to consider the benefits of our products. Ideal Skills: - Graphic Design - Infographic Design - Marketing and Branding Experience The perfect freelancer for this job will have a strong portfolio showcasing similar work. We can provide detailed produ...
I require an experienced professional to use Staad Pro in designing a multistory 3BHK bungalow with a total floor area between 1000-2000 sqft. Unfortunately, no specific design elements like solar panels, basements, or rooftop terraces are necessary for this design. The result needs to be delivered as soon as possible due to urgency. Ideal skills: - Expertise in Staad Pro - Proven architectural planning abilities Please bid accurately reflecting your capabilities with Staad Pro, and commit to the rapid turnaround.
I'm seeking an experienced OMNET++ specialist to develop a security simulation model for Intelligent Transport Systems. Key Qualifications: - Extensive experience with OMNET++ simulations, INET, Veins, and SUMO...develop a security simulation model for Intelligent Transport Systems. Key Qualifications: - Extensive experience with OMNET++ simulations, INET, Veins, and SUMO. - Knowledge of Machine Learning and Blockchain. A deep understanding of network analysis and protocols is also necessary. - Proficient in network modeling and event simulation. Bring your knowledge of OMNET++ to create a top-notch wireless network simulation model. This is your chance to showcase your deep understanding of the complex framework of Intelligent Transport Systems. The more detailed the mod...
...This program will be responsible for establishing and facilitating wireless communication in a short range (up to 100 meters) for an upcoming project. Key requirements: - Proficiency in nRF communication and embedded systems - Experience in developing programs for real-time audio transmission - Ability to ensure program functionality within a short-range wireless communication Your responsibilities will include: - Designing and implementing an efficient program that supports real-time audio communication -> (TX) nRF24L01+, (RX) nRX52840 -> nRF52840 should work as a USB audio device -> Sampling rate should be 48Khz 16bit - Testing the program thoroughly to ensure its reliability within a short-range wireless communication - Providin...
I'm seeking an experienced telemarketer who specializes in outbound calls to assist with marketing campaigns for our clients. Must be UK based as may have a need for meetings occasionally. Specifically, you will focus on: - Marketing a diverse range of products and services inclusive of attracting event visitors and promoting a clients solar B2B services. We have many different clients so it's a varied role and very interesting. - Engaging with potential customers to cleanse and confirm data Ideal Skills: - Strong spoken communication skills. - Consistent track record in sales & marketing although we are not hard sales, we don't do end sale, we are more marketing and promoting on behalf of our clients - lead generation, data cleansing - Familiarity with dealin...
I need a configurator for solar car ports, similar to the provided example. The main focus of the tool should be on providing users with customizable design options. Key Requirements: - **Customizable Design Options**: The configurator should allow users to make moderate changes to the design. This includes selecting different materials and accessories for the solar car ports. Intended Users: - The configurator should cater to both individual homeowners and business clients. Ideal Skills and Experience: - Proficiency in web development, specifically in building configurator tools. - Previous experience in integrating payment gateways into similar tools is a plus. - Understanding of UI/UX design principles to ensure a seamless
As the driving force behind a key industrial project, I'm currently in the market for a talented and meticulous PCB board developer. Your knowledge of the Internet of Things will be challenged, with the board needing to achieve: - Seamless Wireless connectivity - Comprehensive Sensor integration - Precise Data logging capabilities What's the end goal? Enhanced industrial monitoring. This board will lie at the heart of our operation, gathering and transmitting valuable, real-time data back to us for accurate monitoring and decision making. The must-have communication protocol for this board? WiFi. It's a non-negotiable, ensuring our board remains connected and efficient. If you're well versed in PCB design, experience with WiFi connected devices, and h...
For THREE websites. We need to be in TOP ranking, first page for GOOGLE Singapore for 3 WEBSITES. Website 1 (Linen Manufacturer) - Off site Links (300 per month) - 30 keywords; Website 2 (Solar Equipment) - Off site Links (300 per month) - 11 keywords; Website 3 (Steel Factory) - Off site Links (200 per month) - 15 keywords; Requirements - - Minimum 6 UNIQUE articles for each website. - Website analysis & On Page SEO - On Page SEO Report + Weekly & Keyword Ranking reports - Breakdown of cost (Hidden cost will be reported) - Must achieve top ranking (within first page) only whitehat SEO techniques. BUDGET FOR ALL WEBSITES: SGD$40 to SGD$50 MAX. DON'T OVERBID, please. PLEASE NOTE: USE SINGAPORE DOLLAR.
...experience with Security Information and Event Management (SIEM) tools. Proficiency in Python, Linux, and SQL. Knowledge of CIA Triad, governance, risk analysis, compliance, and business continuity planning. Familiarity with Linux and Windows server configuration, Active Directory, network architecture, operations, and security. Experience in areas such as Wireshark, email security, wireless security, cryptography, port scanning, cloud security, and virtualization. Proficiency with tools like Splunk, Burp Suite, Metasploit, Zenmap, etc. Certification experience in Security+ and CEH. Additional Assets: Knowledge and experience with Google Cloud Platform. Responsibilities: Setting realistic schedules, deadlines, and engagement plans...
...abstract shape symbolizing innovation and renewable energy. 2. Energy Molecule: Design a stylized molecule representing chemistry and energy, with colors inspired by the Uruguayan flag. 3. Integrated Letters with Icons: Use the letters of "REFOSYN" to integrate images related to research, such as gears, solar panels, or atoms. 4. Stylized Sun: Create a stylized sun that reflects solar energy and sustainability, using shades of green and blue. 5. Blend of Renewable Elements: Combine symbols of wind, solar, and biomass energy in a cohesive design representing the variety of renewable resources. 6. Minimalist Initials: Design a minimalist logo using the initials "R" and "S" of REFOSYN creatively, with a scientific touch. 7. Transformation ...
I'm looking for a Python expert who can assist me in setting up real-time video streaming and data transfer from Raspberry Pi 5 to a PC over a static network configuration. The project involves an underwater camera and sensor data. Tasks include: Supply Python client and server scripts on a PC and rpi5+camera over a static IP network connection. Using the picamera2 module to stream video to PC. The video is recorded on the PC (time stamp for file name), with text overlay on the video showing PC date and time. UDP for simple 2way communications of small 'hello world' type text strings between the RPI5 and PC. Happy to control everything from the python script on the PC at present with a simple window for viewing the video. No GUI required at present. You should hav...
My goal is to get a high-quality, unique logo design that embodies specific elements. I ask that you: - Incorporate warm colors including red, orange, and yellow. - Integrate specific symbols: a sun, electricity, solar panels, Mt. Hood, and Columbia River. - Bring creative flair to harmoniously unite these elements into a cohesive, eye-catching design. Ideal freelancers for the job would have: - Clear comprehension of design symbolism. - Proficiency in color psychology. - Expertise in creating logos for the renewable energy sector. Your previous experience in the said area will be highly appreciated. Can't wait to collaborate with the right professional to bring this idea to fruition!
...the majority of our visitors using mobile devices, a crucial part of the redesign is to ensure that our website is mobile-friendly. Please note that I have an example of website designs we admire and these will be shared for inspiration and better understanding of our aesthetic preferences. I also would be able to purchase the theme and send it to you! Important: * Website should be done on an external server or similar so that our website will not be disrupted and later uploaded * Not all pages
I'm looking for a proficient freelancer to assist me in generating high-quality solar leads on a national scale. Key Points: - Target Audience: I'm interested in both residential and commercial properties. - Geographic Scope: The leads should come from all across the country. - Lead Delivery: I'd prefer to receive these leads through SMS. Your role will be to develop a strategy that ensures the leads are not only numerous but also conversion-ready. Ideal Skills: - Experience in lead generation, particularly in the solar industry. - Ability to target both residential and commercial properties. - Proficiency in national-scale lead generation. - Familiarity with SMS-based lead delivery. Please provide examples of past projects relevant to this scope.
Estou desenvolvendo um projeto com a seguinte proposta: fazer a medição e análise de vibração de um motor. Características: estou utilizando um sensor MPU6050 para fazer a medição analógica da vibração. Esse componente é um acelerômetro e consegue medir a aceleração nos eixos X, Y e Z. Estou usando uma ESP32 para fazer o processamento e fazendo a programação dele através do Arduino IDE. Preciso que o MPU6050 faça a medição nos três eixos e com base nos valores coletados, o programa consiga aplicar a Transformada Rápida de Fourier (FFT) desses dados, convertendo os valores do domínio do tempo para o da frequê...
Usando la placa de desarrollo ESP32-S2-DevKitC-1 (la que trae el led rgb), conectar a internet en modo station y hacer peticiones a un servidor de prueba (puede ser de esos gratuitos o instalarlo en el propio PC) para transmitir un dato a la internet (puede ser una cadena de caracteres). Hay que considerar que el led RGB debe usarse ...internet en modo station y hacer peticiones a un servidor de prueba (puede ser de esos gratuitos o instalarlo en el propio PC) para transmitir un dato a la internet (puede ser una cadena de caracteres). Hay que considerar que el led RGB debe usarse para indicar cuando se envía un mensaje (que use algunos colores). Idealmente debe realizarse en la plataforma PlatformIO con la herramienta ESP-IDF (NO ARDUINO). Para la placa ESP32-S2-DevKitC-1 (no...
I have been interested in astrology for 15 years and I know all the chart types. The horoscope can be interpreted as natal solar lunar progress.
We are looking for an ESP32 coder that can work on a "per project" basis. For the first project, the hardware has already been designed and assembled. Your main responsibilities will be to write code to ensure that the ESP32 adequately read the data from the INA226 Current & Voltage Sensor and then transmit the measurement data via LoRa. Key Requirements: - Proficiency in ESP32 programming - Previous work with sensor and sensor module integration - Familiarity with LoRa integration, or willing to learn
I'm searching for an outgoing, eloquent individual to make calls to homeowners in New Hampshire, with a focus on selling our solar home improvement services. Responsibilities will include: - Communicating professionally to promote our product - Answering any questions homeowners may have about the service - Tailoring your sales pitch to persuade homeowners of our solar service's value It's essential that the candidate possess: - Exceptional communication and persuasion skills - Previous experience in telemarketing, preferably within the home improvement sector - Knowledge of solar energy systems and their benefits, as this will count heavily in your favor when conveying the product’s value to homeowners. If you are a determined go-getter wi...
...focused on channel estimation with Non-Orthogonal Multiple Access (NOMA) in cell-free massive MIMO wireless networks. Primary Project Goals: - The main aim is to improve channel estimation with NOMA. - A crucial aspect of this project involves boosting the Signal-to-interference-plus-noise ratio (SINR). Specific Requirements: The ideal freelancer should have significant experience in wireless communication and a good understanding of MIMO networks and NOMA. Any proposed solution should be geared towards enhancing network performance, enhancing channel reliability, and reducing interference. Desired Skills and Expertise: - MIMO Wireless Networks - Non-Orthogonal Multiple Access (NOMA) - Wireless Communication - Channel Estimation Your proposal will ...
Hi Eclick Softwares, I noticed your profile and would like to offer you my project. We can discuss any details over chat.
I'm seeking a capable programmer with expertise in using C and Atmel Studio and a good understanding of Atmel microprocessor...expertise in using C and Atmel Studio and a good understanding of Atmel microprocessors. The project involves developing a Simple Program capable of: - Reading analog sensor values - Reading digital input signals - Controlling digital output signals Using a combination of analog and digital inputs and outputs is key to the project, so demonstrated experience in this area is required. Prior knowledge of Arduino would also be beneficial. The right freelancer should be proficient in microprocessors, specifically with Atmel typed ones, and comfortable using both digital and analog inputs and outputs. Familiarity with wireless communication...
I'm looking for a creative designer to create a unique and appealing t-shirt design for a family camp theme. There will only be one color printed on the shirt - dark navy or black (on a heather grey shirt) The shirt should look like an ivy league college/university seal with four simple pictures. On th...college/university seal with four simple pictures. On the top where things are typically written in latin: Carpe Carpum On the bottom where the school name would be: Camp Hornbeck at Augur Lake Pictures in 4 quadrants: A moose with a lei A simple boat with the the words DA ROOF lettered on the actual boat on the side towards the back. A dry fly An eclipse emblem - instead of the words "total solar eclipse" it should say "in the Path of Totality" ...
I'm seeking a highly skilled web developer to build an informational website specifically for solar users. The main purpose of the site is to present our system in a detailed, user-friendly manner. Key Features: - Display information about our proprietary system - Educate users on the benefits of solar energy Ideal skills: - Prior experience in developing websites related to solar energy is highly preferable - An eye for design and user experience to attract and retain the target audience This project only requires the technical skills to build it. It's simple one page format and the design work is done and will be provided for you along with the necessary files.
I need help using Squareline Studio and having arcs that are displayed on a touch screen to print their values to the serial monitor of Arduino IDE
...tiled. Water is to be supplied from boreholes and water is purified and stored on the roof of the property, solar water heater, and pump, and septic tank are to be dug out for human waste, rain water harvester, and 2x waster storage tanks on the roof. The outer wall should have a gatehouse with a draw bridge, a draw bridge to be raised by the 2x electrical motors but a manual way to raise the bridge is essential in cases of motor failure. security cameras to be fitted to the exterior of the property to cover 360 of the property and cover all blind spots, all cameras to have IP68 water resistance and night vision, infra-red, motion detectors, connected be via smart app, and have PR sensor lights attached to external cameras, all internal areas to have cameras with excepti...
I need a freelancer to assist me in connecting my MIT App Inventor to my HiveMQ broker. The main goal of this project is for me to gain knowledge and understanding about IoT connectivity. I have the arduino code working succssfuly when I enter the topic and the message manullay in HiveMQ broker. Now I like to use MIT App inventor to connect to broker and passes the topic & messages Key requirements: - Connection of MIT App Inventor to HiveMQ broker - Ability to switch ESP32 LED on/off Ideal Skills: - Proficiency in IoT connectivity - Experience with MIT App Inventor and HiveMQ - Strong understanding of ESP32 and MQTT protocol
