ESP32 Modbus Slave Setup

@Mahihassi

As an experienced electrical engineer and firmware developer with a specialization in embedded systems, I've successfully executed various projects involving the ESP32, Modbus protocols, and RS485 communication. Through my career, I have extensively worked with ESPHome – which you require for this project - and am extremely proficient with implementing Modbus RTU over RS485. Notably, my expertise extends beyond just programming. My grasp on PCB design and RF hardware aligns well with your project's needs, as a robust firmware solution requires well-designed hardware architecture. My additional skills in AI, Machine Learning, and Deep Learning can also offer value-add by providing intelligent algorithms for edge devices and efficient control and data management. Furthermore, hiring me means your project will have the advantage of full product development workflow from idea to prototype to final product. Overall, I take pride in my thorough approach to projects, ensuring robust solutions that stand the test of time. With my rich experience across multiple domains coupled with your project's requirements, I am confident that ASCII Characters are the best fit to handle your ESP32 Modbus Slave Setup requirement. Let's chat further about how we can turn your vision into a reality.

@SPARKtechBD

Since 2003 I am working in Digital Electronic. So more than 18 years of experience in Electronics. Arduino NANO/UNO/MEGA, ESP32 and Raspberry PI to build a digital device to read sensor data and send it to the web server, motor control, control relay switches and LEDs. More than 5(five) years of experience in Arduino design and build. If you want an excellent and error-free project delivery, then send a message to me, please. Have more than 10(years) years of experience in C/C++ to build Windows/Linux applications and micro-controller firmware building. If you want a good job delivery, then send a message to me, please. Since 1995 I have been working on Analog and Digital Electronics to build any kind of device. I have build lots of devices. So more than 20 years of experience on Electronics. Including power supply design. Any kinds of schematic and PCB design. Expert PCB design in EasyEDA Pro IDE.

@markoa7

With my deep understanding of the ESP32 and Modbus protocols gathered from years of experience, I am primed to deliver a top-notch solution for your ESP32 Modbus Slave Setup project. Supercharging your ESP32 to effectively work as a Modbus slave over RS485 is within my wheelhouse. Throughout my journey in electronic product development, I have honed my skills in implementing various communication protocols including UART, SPI, Ethernet, USB, CAN, and most importantly - Modbus. My proficiency in ESPHome and working with diverse sensors, switches, and buttons integrate beautifully with your project requirements. You can rely on me to configure the ESPHome based on your needs and turn it into an efficient Modbus-capable device. Additionally, having strong knowledge of power supply circuits and multilayer designs for embedded systems perfectly aligns me to utilize ESP32’s hardware to its full capacity. Moreover, my meticulous approach towards PCB design combined with my firmware programming abilities guarantee seamless integration of the chosen protocols. Be it the power supply circuits or robust printed circuit boards (PCBs), you can trust me to design them with reliability and optimum performance in mind. Let's connect and discuss how we can achieve excellence together in implementing Modbus RTU over RS485 for your crucial project.

@majeed219

As an experienced embedded systems engineer, professional PCB designer and committed ESP32 programmer, I'm perfectly suited for your Modbus Slave Setup project. My proficiency in ESPHome, strong knowledge of Modbus protocols, and prior experience with ESP32 and RS485 communication ensure the integration of this system will be seamless. Working across a wide range of cutting-edge technologies, I possess the very skills you require to complete this project successfully. I have considerable microcontroller programming experience, including working with numerous models from various leading manufacturers. In addition to my practical knowledge base, I also bring the complementary abilities in software development and simulations essential for efficient system integration Your satisfaction is paramount to me. Alongside providing qualitative services in a timely manner at affordable rates, my commitment extends beyond project completion with comprehensive maintenance and support. By selecting me for your ESP32 Modbus slave setup project, you’re not only choosing talent but also a reliable partner ready to walk the extra mile to make sure your expectations are exceeded in every aspect. Let's create something awesome together and turn your ideas into reality!

@ZAKI102

Hello, I’m ready to set up your ESP-based Modbus slave system with reliable communication and clean integration. With over 10 years of experience in embedded systems, industrial protocols, and ESP32 development, I deliver solutions that work smoothly in real industrial environments. What I Will Deliver: Modbus slave configuration on ESP32 (RTU over RS-485 or Modbus TCP) Register map & data structure for all sensors/devices you need monitored Reliable serial/ethernet communication handling with error detection / retry logic Test code and functional verification to confirm correct data exchange with the master Wiring diagram and integration notes for seamless installation Well-commented source code and instructions for future maintenance Quick questions: Will you use Modbus RTU (RS-485) or Modbus TCP (Ethernet/Wi-Fi)? How many registers/values need to be exchanged, and what type (coils, inputs, holding registers)? Any specific timing/latency requirements? Best regards, Zakarya Sadi Embedded & Automation Engineer

@bsarevalo

A greeting! My experience in implementing ESPHome, ESP32, Modbus RTU protocol makes me the ideal candidate for your project! I'd like to cover all the details in the chat! If you have any doubts about my offer, you can request a functional demo code in the chat! I hope to work on your project as soon as possible!

@AmazingEngr76386

As an experienced developer of embedded systems and a skilled ESP32 programmer, I offer an excellent fit for your project of setting up the ESP32 as a Modbus slave over RS485. Having comprehensive knowledge of ESPHome and Modbus protocols, I can effectively implement Modbus RTU over RS485 and do the requisite setup for the sensors, switches, and buttons. Over the past decade, I have honed my proficiencies in Arduino, Automation, C Programming, Electrical Engineering, Electronics, and Microcontrollers—all skills crucial to your project’s success. In several similar projects that demanded ESP32 programming with RS485 communication (akin to yours), I've consistently delivered top-notch results that met client expectations. What sets me apart is my long-term outlook towards my relationships with clients. It primes me to design solutions that are not only performant and scalable but also maintainable in the long run. By working with me, you won't just receive immediate project solution but also a reliable partner for any future needs you may have. Let's ensure every detail aligns perfectly with your goals and grow organically with each new project we undertake.

@TellezMiotta

Hi! My name is Fernando Téllez. I’m an Electrical Engineer at Universidad Simón Bolívar (USB), one of the most prestigious universities in my country. During my years of professional training, I had the opportunity to develop several extracurricular projects on software applied to electrical engineering problems like decoupled load flow, transmission line modeling, and so on. Furthermore, my undergraduate thesis consisted on a Monte Carlo simulation over a Power System to acquire its statistical behavior on Availability and Reliability. It got awarded with honors upon its approval. Over my career I've used custom made applications, both in MATLAB and python, to improve and automate procedures like acquiring performance data of generation plants, detecting failures and reporting, just to mention a few.

@SMBelectronics

Hi, I can handle this. I work extensively with **ESP32 + ESPHome** and have implemented **Modbus RTU slave devices over RS485** for sensors, switches, and control I/O. I understand the common pitfalls around timing, register mapping, and RS485 direction control, and I make sure the device behaves predictably on a live Modbus network. What I’ll do: * Configure the ESP32 as a **Modbus RTU slave over RS485** * Define clean Modbus registers for sensors, switches, and buttons * Implement everything in **ESPHome**, so it’s easy to maintain and extend * Ensure stable communication and proper handling of polling and retries I take on selected ESPHome projects only and focus on delivering setups that just work, not half-tested configs. If I commit, I’ll make sure this integrates smoothly with your existing Modbus master. Next step: share your ESP32 variant, RS485 transceiver, and expected Modbus register map, or we can align quickly on a short call. Best, Abbas P.S. I can also help optimize the register layout so it stays compatible if you add more sensors later.

@redbrickamerica

Hello! Ready to dive into the ESP32 Modbus Slave Setup? Our team excels in ESPHome and Modbus integrations, ensuring seamless communication as your ESP32 slave over RS485. With extensive experience in Embedded Systems, Automation, and Electronics, we will expertly handle sensor, switch, and button configurations using ESPHome. Our proficiency in Modbus RTU over RS485 guarantees precise implementation, meeting your project's needs effectively. Let's bring your project to life with precision and expertise. How can we assist you further?

@julianm260

Hello ✅Kalim✅ I’ve carefully reviewed your project for setting up an ESP-based Modbus Slave, and it’s something I can help you complete cleanly and reliably. ✨✨✨I have hands-on experience working with ESP32/ESP8266, industrial communication protocols, and Modbus RTU/TCP implementations. I’ve previously configured ESP devices to act as Modbus slaves communicating with PLCs, HMIs, and SCADA systems, ensuring stable register mapping, accurate data exchange, and proper timing behavior. ⚡⚡⚡How I plan to approach your project: -Review your hardware setup -Define Modbus parameters clearly -Implement and test the Modbus Slave firmware on the ESP. -Validate communication using a Modbus master tool -Provide clean, well-documented code and support I focus on writing readable, maintainable code and making sure the device behaves correctly in real-world conditions, not just in a basic demo. ❓A few quick questions to ensure I match your needs exactly: -Are you using Modbus RTU (RS485) or Modbus TCP? -Which ESP board are you using? ✅Communication and timely delivery are very important to me, and I’ll keep you updated throughout the project. Looking forward to discussing this further and getting your Modbus setup working smoothly.

@usmanbashir12100

Hi, I’m experienced with ESP32 + ESPHome + Modbus RTU over RS485 and can implement this cleanly and reliably. What I can deliver: ESP32 configured as a Modbus RTU slave over RS485 Proper setup of sensors, switches, and buttons exposed via Modbus registers ESPHome configuration (clean, commented, and easy to extend) Stable communication and testing with a Modbus master Clear guidance on wiring (RS485 transceiver, pins, termination) I’ve worked with ESP32/ESPHome in industrial-style setups and understand Modbus addressing, timing, and reliability requirements. Ready to start—happy to review your register map or hardware details.

@toriquldev123

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@Zainrais0786

Are you looking for an ESP32 programmer experienced with ESPHome and Modbus to develop firmware for your ESP32. Hi, I am Zain. I can easily handle the task including • Embedded Systems • Firmware Development • ESP32 / FreeRTOS / Modbus / RS485 • Circuit Design • PCB Design • KiCAD / Altium • Firmware Development • C / C++ etc. Lets chat. Best regards

@SolutionMart

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@ahmaddar2970

Hi there, I will set up an ESP32 as a Modbus RTU slave over RS485 using ESPHome, with a clean YAML config to map sensors, switches, and buttons to Modbus registers and coils. With ESPHome experience and RS485 knowledge, I’ll ensure stable communication, correct timing for RTU frames, and robust error handling. The plan: configure the RS485 bus (transceiver pins), implement a Modbus slave in ESPHome, expose 16-bit registers for sensors and 1-bit coils for switches and buttons, and provide a test harness to verify with a Modbus master. Deliverables: ESPHome YAML, a small register map, setup guide for your Home Assistant, and a quick-start test script. Timeline: 3-5 days after confirmation; I’m ready to start now. Could you share the exact Modbus register map (addresses and data types) for your sensors, switches, and buttons, and confirm the desired RS485 baud rate and device ID range? Best regards,

@yaroslavmark

✅ Okay, I got what you want exactly. ❤️ I am a professional Embedded Engineer with over 10 years of experience, providing robust firmware development for microcontrollers, real-time communication stacks, and industrial protocol integration. In my opinion, the best way to implement your ESP Modbus Slave is to create a lightweight, reliable firmware layer that cleanly separates the Modbus state machine from your application logic. This approach will ensure stable communication over serial and allow easy future extensions to your sensor/control interfaces. This project is very similar to my previous work. I’ve developed Modbus RTU firmware on ESP32/STM32 platforms, including clean register mapping and fault handling for automation equipment. While working with a controls integrator in Worcester, MA, I architected a modular Modbus stack to serve multiple third-party masters with minimal latency. The most important skill for this project is solid embedded C and protocol implementation experience; I will leverage structured state machines and tested buffer handling to ensure you get reliable Modbus responses every time. Via private chatting or meeting, I will provide the creative idea and good tech solution for your project and I want to discuss the budget and timeline in detail.

@tetianam8

⭐⭐⭐⭐⭐ Hi — this is a straightforward ESP32 job, and I’ve done ESPHome + Modbus RTU over RS485 setups like this before. I understand the ESP32 will act as a Modbus slave, exposing sensors, switches, and buttons over RS485, with everything configured and maintained through ESPHome. The priority here is stable Modbus communication, clean register mapping, and an ESPHome config that’s easy to extend later. My approach would be to: Set up ESP32 UART + RS485 transceiver correctly (DE/RE timing matters) Implement Modbus RTU slave registers for sensors, switches, and button states Define clear register maps and data types Build everything cleanly in ESPHome so it integrates smoothly with your system I’ve worked with ESPHome components, custom Modbus registers, and real-world RS485 noise considerations, so reliability is a key focus — not just “it works on the bench.” Proposed milestones ESP32 + RS485 configuration in ESPHome Modbus RTU slave setup and register mapping Sensors, switches, and button integration Testing and communication validation Final ESPHome YAML + usage notes A couple of quick questions: Target baud rate and Modbus register map already defined? Which ESP32 variant and RS485 transceiver are you using? If you want something solid, readable, and easy to maintain in ESPHome, I can start right away.

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