WiFi Modbus Gateway for Danfoss EKC 202C

@AwaisChaudhry

Hi there, I will build a compact WiFi gateway that talks to the Danfoss EKC 202C via Modbus RTU (RS-485) and exposes a local web interface for live monitoring, configuration, and 60-second temperature logging. The architecture will keep Modbus handling separate from storage and the web server, and it will be ready for future cloud expansion. I will implement an ESP32-based solution with a dedicated Modbus layer, a local API like /api/status and /api/temperature, a lightweight UI, and a 24-hour temperature chart. The system will boot in AP mode, auto-connect to the user’s WiFi, and expose a hostname-friendly URL on the local network. Approach: 1) Create a robust Modbus RTU driver and register map for EKC 202C, 2) Build a modular stack with Modbus, storage (60s logging to local flash), API server, and web UI, 3) Develop the 24-hour chart and real-time status indicators, 4) Ensure the setpoint form writes via Modbus and reads back to confirm, 5) Prepare wiring diagram and setup docs for quick start. This is designed for a future cloud path without changing the core local behavior. What is your preferred Modbus register mapping starting point for the EKC 202C? Questions for you (concise and essential): - Do you have an existing Modbus register map for the EKC 202C or should I implement a reference mapping from datasheets? - Any preferred UI styling or color scheme for the web interface on mobile and desktop? - Are there security constraints for local access (e.g., device nam

@macroenergy

As an experienced electrical engineer with a strong background in several key areas, I am confident that I am the ideal candidate for your WiFi Modbus Gateway project. My well-rounded knowledge spans across crucial aspects like Electronics, Embedded Systems, Microcontroller, Arduino and WiFi - all of which are precisely aligned with the requirements of this project. Over the years, I have developed a sophisticated skill-set in working with cutting-edge technologies such as ESP32 and RS485 modules. On top of my comprehensive technical expertise, my experience working in challenging domains like Digital Motor Control, Analog Design, and Power Electronics has honed my problem-solving abilities to the T. This means that no matter what complexities may arise during the development process or when dealing with your Danfoss EKC 202C controller, you can rest assured knowing they will be overcome efficiently. In terms of your core features and technical requirements, I can provide an elegantly modular architecture separating Modbus, storage, web server, and UI while ensuring a separate Modbus communication layer and an internal API for seamless data management. These skills combined with my meticulous approach towards wiring diagrams and detailed documentation will guarantee you not just a working firmware but a comprehensive package meeting all your expectations.

@markoa7

Having worked extensively with key components and protocols relevant to this project, such as WiFi, Modbus RTU, ESP32 and RS-485, I believe I am the ideal freelance developer for this job. Additionally, my focus on system integration and modular architecture aligns well with the project's needs. My past experience in designing and developing robust PCBs is particularly valuable here, as it ensures the reliability of the device when it comes to efficient management of temperature data logging and setpoint modification. Moreover, I have mastered effective firmware development, which will enable me to build an intuitive and responsive web interface for live monitoring of temperature values. In line with the project goals, I can even create an internal API for system data that will further enhance user experience. As for future expansion potential, I am comfortable with MQTT or HTTPS API integrations as they are common in remote monitoring systems. In summary, backed by years of experience in electronics design, embedded systems development and microcontroller programming, marrying your project requirements with my demonstrated capabilities will result in a high-quality working firmware that includes thorough documentation and wiring diagrams along with setup instructions. Let me bring your innovative WiFi Modbus Gateway to life without cloud connectivity while ensuring the possibility of effortless future expansion into cloud services!

@quocduypt95

Hello, I have worked on many similar IoT node systems for electricity and water meters supporting RS485, 1-wire, etc. I will design the hardware using Altium and program the firmware. If you need a prototype, I can also create Gerber, BOM, and pick-place interfaces so you can easily order from JLCPCB. I can also handle the rest, including the backend server and dashboard. Please contact me. Thank you,

@ahmed4499

Hello Sir i am computer engineer and automation expert so may i can help you doing that professionally , thanks and regards

@OutsourceMan

⭐⭐⭐⭐⭐ Thoroughly review the Danfoss EKC 202C Modbus RTU protocol to ensure reliable communication with the ESP32-based gateway. Design a modular firmware architecture separating Modbus handling, local storage, web server, and UI for maintainability and future cloud expansion. Implement secure WiFi setup with device AP mode on first boot, enabling easy configuration via 192.168.4.1. Develop real-time monitoring of temperature, fan, compressor, defrost, and alarm statuses with local logging of 24-hour temperature data. Create a responsive web interface for setpoint modification, status icons, and 24-hour temperature charts compatible with smartphones, tablets, and desktops. CnELIndia can provide expertise in embedded systems, WiFi configuration, and Modbus integration to ensure stable hardware-software communication. Raman Ladhani can assist in web interface development, API structuring, and documentation of Modbus register mapping for clear client handoff. Deliver complete firmware, source code, wiring diagrams, setup instructions, and technical documentation within the 1–2 week timeline.

@hayat38402

Hi, how are you doing? I went through your project description and I can help you in your project. your project requirements perfectly match my expertise. We are a team of Electrical and Electronics engineers, we have successfully completed 1000+ Projects for multiple regular clients from OMAN, UK, USA, Australia, Canada, France, Germany, Lebanon and many other countries. We are providing our services in following areas:  Embedded C Programming.  VHDL/Verilog, Quartus/Vivado, LabVIEW/ Multisim/PSPICE/VLSI  MATLAB/SIMULINK  Network Simulator NS2/NS3  Microcontroller like Arduino, Raspberry Pi, FPGA, AVR, PIC, STM32 and ESP32.  IDEs like Keil MDK V5, ATmel studio and MPLab XC8.  PLCs / SCADA  PCB Designing Proteus, Eagle, KiCAD and Altium  IOT Technologies like Ethernet, GSM GPRS.  HTTP Restful APIs connection for IOT Communications. Also, we have good command over report writing, I can show you many samples of our previous reports. Kindly consider us for your project and text me so that we can further discuss specifically about your project's main goals and requirements.

@melikatfz

Hello, Regarding your project, I noticed that optimizing database queries can drastically enhance performance—an aspect often overlooked by non-experts. My approach ensures efficient query handling, allowing the system to deliver faster results and better responsiveness. I once revamped a complex data processing system, reducing latency by 30% and boosting throughput significantly. I include 30 days of post-deployment bug-fixing at no extra charge. What database management system are you currently using? Let's discuss how I can help.

@mykolalus

Hi, From your description, you need a **WiFi gateway** that connects to a Danfoss EKC 202C refrigeration controller via RS-485 and provides a browser-based interface for monitoring temperature, logging data, and adjusting the setpoint. Key considerations will be robust Modbus polling, local data storage for 24-hour logging, and a modular architecture separating communication, storage, and the web API. My approach would be: 1. Implement a dedicated Modbus RTU communication layer over RS-485 2. Build firmware architecture separating Modbus, storage, and web services 3. Develop a responsive web UI with charts and status indicators 4. Implement local temperature logging and API endpoints 5. Deliver firmware, wiring diagram, and setup documentation Do you already have the **Modbus register map for the EKC 202C**, or should I extract and document it during development? Best regards Mykola

@Eliteinno

Hi, Our devs looked at your project and noticed a potential bottleneck in the current system architecture, which might hinder your ability to scale effectively. My team and I have backend experts ready to streamline your architecture, ensuring it supports your growth effortlessly. We recently completed a complex e-commerce platform using React and Node.js, handling over a million daily transactions without a hitch. It was crucial to maintain speed and reliability, which we achieved by optimizing both front-end and back-end processes. I'll be your direct technical point of contact, and we'll set up a staging environment for you to test features before they go live. This ensures transparency and smooth integration throughout the project. How does your long-term vision align with your current tech stack? Let's explore how we can bring your project to life.

@yaroslavmark

Hi, I’m an electrical and embedded systems engineer with 10+ years of experience developing industrial IoT gateways and Modbus-based monitoring systems. I have delivered 30+ firmware projects using ESP32/STM32 with RS-485 communication, including refrigeration and HVAC controllers with stable Modbus polling and responsive local dashboards used in production environments. Approach ✅ I will design the firmware architecture on ESP32 with clearly separated modules: Modbus RTU communication layer, internal REST API, storage layer, and lightweight web server to ensure maintainability and future cloud expansion. ✅ I will implement reliable Modbus RTU communication over RS-485 to read EKC 202C registers, including CRC validation, retry handling, polling scheduling, and structured parsing of temperature, compressor, fan, defrost, and alarm states. ✅ I will build a responsive web UI with REST endpoints (/api/status, /api/temperature) and implement a ring-buffer temperature logger storing ~1440 samples/day with a 24-hour chart and controlled setpoint update via Modbus. Questions ✅ I would like to confirm the exact Modbus register map and function codes for the EKC 202C parameters to ensure correct polling and write operations. ✅ Should the 24-hour temperature log be stored in ESP32 flash (SPIFFS/LittleFS) or do you prefer external storage to maximize flash endurance? Best, Yaroslav

@Feriver

Hello, I can develop a WiFi gateway using an ESP32 that connects via Modbus RTU to your Danfoss EKC 202C, providing a local web interface for live monitoring, temperature logging, and setpoint modification. The system will include a separate Modbus communication layer, internal API endpoints (e.g., /api/status, /api/temperature), and a responsive web interface with status icons, 24-hour temperature charts, and editable setpoints. Data will be logged locally every 60 seconds for 24 hours, with modular architecture ready for future cloud expansion. Deliverables include fully working firmware, source code, wiring diagram, setup instructions, and documentation of the Modbus register mapping. The project can be completed within 1–2 weeks with a clean, maintainable, and extensible design. Clarification Questions: Are there specific Modbus registers you want prioritized for live monitoring, or should I map all relevant EKC 202C parameters? Should the web interface allow multiple setpoints per controller or only a single active setpoint? Thanks, Asif

@cesur135

Hi there! My name is dervis, and I'm an experienced freelancer specializing in the field of industrial automation. I've successfully delivered numerous projects similar to yours, most notably in wastewater and water treatment plant automation. In these projects, I effectively operated with SIEMENS TIA Portal and Simatic Manager to write system software according to automation scenarios. Moreover, my expertise extended to monitoring and controlling systems with SIEMENS WinCC SCADA, which I believe will be essential for your WiFi Modbus Gateway project. Additionally, my proficiency in using ABB AC500 PLC program and various drivers involved in ventilation systems aligns well with the aims of your project. I believe this hands-on experience will be greatly beneficial for developing a robust modular architecture that effectively bridges the Danfoss EKC 202C controller, Modbus RTU communication layer, storage units, web servers and UI. Lastly, having a firm understanding of MQTT, an integral part of your future expansion plans for cloud integration with remote monitoring, will enable me to ensure not only a solid local solution but also open up possibilities for scalable multi-device dashboards. With proven success in meeting tight deadlines, delivering quality work along with adequate documentation and wiring diagrams, I believe I'm a top fit for this gig!

@electronicsdone

Best ESP32 Modbus Gateway Systems Expert ⭐⭐⭐⭐⭐ Hi, Thank you for posting your project, “WiFi Modbus Gateway for Danfoss EKC 202C.” I’ve reviewed your requirements and can help develop a reliable ESP32-based gateway that communicates with the controller via Modbus RTU (RS-485) while providing a clean and responsive local web interface for monitoring and control. I bring 11+ years of experience in embedded systems, IoT hardware design, and industrial communication protocols, including hands-on work with ESP32 platforms, Modbus RTU/TCP integration, local web servers, and industrial device gateways used in automation and monitoring systems. ✅ How I’ll Help You Succeed 1. Implement a stable Modbus RTU communication layer to reliably read and write registers from the Danfoss EKC 202C controller. 2. Develop a modular hardware architecture separating Modbus communication, data storage, API services, and web interface for future scalability. 3. Build a responsive local web dashboard showing real-time temperature, system status icons, alarms, and a 24-hour temperature chart. ✅ Before I start, one quick question: Do you already have the Modbus register map for the Danfoss EKC 202C, or should I assist in identifying the required registers for temperature, status, and control functions? If you share that, we can align quickly and move forward. Best regards, Prat PCB Must Innovations

@emilesd617

Hi, I am an embedded systems developer with 8 years of experience. I am familiar with ESP32, Modbus RTU, Arduino, WiFi, and Web Development. For this project, the most important point is building a reliable Modbus communication layer to connect the EKC 202C controller and display live data via a responsive web interface. This ensures accurate monitoring and control for the user. I'm an individual freelancer and can work on any time zone you want. Please contact me with the best time for you to have a quick chat. Looking forward to discussing more details. Thanks. Emile

@mahads31

Hi, I took the time to review your project and it’s clear that this is completely doable with the right development approach. I have strong expertise in Electronics, WiFi, Microcontroller, Technical Documentation, API Development, MQTT, Bluetooth Low Energy (BLE), Arduino, Embedded Systems and Web Development and specialize in building efficient, modern, and scalable web solutions. My work focuses on clean development, responsive design, optimized speed, and a user-friendly interface to ensure everything runs smoothly and professionally. I’m confident I can deliver a high-quality result that meets your expectations. Best regards. Mahad Sheikh

@technologybeach

As an experienced Full Stack Developer and Software Engineer, I possess a comprehensive skill set that covers all crucial aspects of your project. I have a strong background in Web & Mobile App Development, which includes both native and hybrid solutions as well as UI/UX Design - ensuring not only a robust backend but also an intuitive frontend. My expertise in APIs and third-party integrations will be instrumental in creating a separate Modbus communication layer and internal API for your system data. I understand the importance of scalability. Although Version 1 doesn't include cloud connectivity, my knowledge in AWS infrastructure makes sure that the architecture we design now is scalable enough for future expansion when you decide to integrate with remote servers or create multi-device dashboards. And when it comes to project management, I excel in an Agile environment as demonstrated by my extensive use of CI/CD pipelines for containerization with Docker and version control with Git. Your estimated timeline can be achieved comfortably without compromising the quality of work. Delivered within this period will be a working firmware, source code, wiring diagram, setup instructions, as well as clear documentation that details the Modbus register mapping used.

@SkillCrafts

I’ve specialized in developing industrial IoT gateways utilizing Modbus RTU and WiFi, specifically for refrigeration and HVAC monitoring systems similar to yours. The Danfoss EKC 202C is a reliable controller, but creating a stable gateway requires precise register mapping and robust handling of the RS485 physical layer to prevent data corruption. I am confident in my ability to deliver a low-latency, high-performance bridge that integrates your Danfoss data into a modern digital workflow seamlessly, ensuring real-time visibility into your refrigeration metrics. My technical strategy involves using an ESP32 microcontroller as the core processor due to its integrated WiFi capabilities and reliable UART performance when paired with a MAX485 transceiver. I will write specialized firmware to poll the EKC 202C registers at defined intervals, converting the Modbus payload into structured JSON for transmission via MQTT or a RESTful API. To ensure field reliability, I will implement a local captive portal for easy WiFi provisioning and advanced error-handling logic to mitigate CRC mismatches or communication timeouts. This solution will be designed for "plug-and-play" deployment, ensuring high uptime even in the demanding and electrically noisy environments where refrigeration units typically operate. Are you planning to push this data to a specific cloud platform like AWS or Azure, or should I prepare the gateway for a local SCADA integration? Also, do you have the Danfoss EKA 178A communication module already, or will the gateway connect directly to the controller’s serial port? I am available to discuss these technical specifics and can hop on a brief call to finalize the hardware requirements and development timeline at your convenience.

@ahmetTC

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