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This project centres on a compact embedded platform that will sit inside an industrial automation cabinet and take charge of continuous monitoring and control. At its core the board must read an oxygen sensor, process the signal locally, apply any calibration curves, and then drive a pair of digital outputs that feed the plant’s PLC. A small TFT or OLED status screen and a Modbus-RTU port over RS-485 will round out the human-machine and network interfaces. I will provide the exact sensor datasheet, operating ranges, and the enclosure footprint; you handle everything from component selection to fully-routed Gerber files and production-ready firmware. Key deliverables • Schematic capture and multilayer PCB layout (KiCad or Altium) matching my mechanical constraints • BOM with second-source options for all active parts • Firmware (C/C++ on STM32 or equivalent) that: – Reads the oxygen sensor via the recommended analogue front end – Filters and linearises the signal in real time – Publishes the value over Modbus registers – Drives two digital outputs based on user-defined thresholds stored in EEPROM • A short build & flash guide plus test procedure I can repeat on the bench Acceptance criteria 1. Board passes a smoke test at 24 Vdc and draws less than 150 mA idle. 2. Sensor reading on the display matches my reference meter within ±2 %. 3. Modbus tool sees stable data at 9600 N 8 1 with no frame errors during a 12-hour soak. 4. All manufacturing files import into JLCPCB without DRC violations. If something in the spec could be improved, feel free to point it out early; I’m flexible on exact parts as long as long-term availability is considered.
Project ID: 40595036
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41 freelancers are bidding on average ₹63,818 INR for this job

With a Master's degree in Embedded Systems and extensive experience in industrial automation, I am confident that I am an ideal candidate for your project. Not only do I have the technical skills you require, but I also offer the insight that comes from having handled multiple projects in similar contexts. My proficiency with C/C++ programming, STM32 microcontrollers, and schematic capture using tools like KiCad and Altium will ensure a smooth design process with acute attention to your mechanical specifications. Furthermore, my comprehensive knowledge of electronics, circuit design, and embedded systems will enable me to choose the perfect components for your project. This includes second-source options for all active parts to uphold long-term availability as one of your flexible criteria. Apart from creating a well-documented and fully-routed Gerber file design within your manufacturing constraints, I'll provide you with robust firmware that accurately reads and filters the oxygen sensor data in real-time. The firmware will also drive digital outputs based on user-defined thresholds stored in EEPROM and publish oxygen values over Modbus registers. Finally, my commitment to quality is reflected in my approach of complete product development from ???? → ????????? → ????? ???????.
₹65,000 INR in 7 days
8.4
8.4

Hi, I have experience in designing Circuits and can complete your project. I have expertise in the following: 1- Designing schematic and PCBA 2- Ordering the PCBA and getting boards manufactured. 3- Writing firmware for the PCBA to make sure everything works as expected. 4- I can also develop smartphone apps to communicate and control the hardware. If you wish we can discuss in chat. Thank you.
₹56,250 INR in 7 days
7.5
7.5

This requirement perfectly aligns with my expertise. I designed many such product before. Does the oxygen sensor has 4-20mA output ? I am sure, you would need the hardware designed perfectly match with your enclosure (5M enclosure? ) so KiCad design should be made with all 3D models which consume time. I have over 25 years of programming experience and 8+ years in STM32. I from electronics background, so both sides will equally be taken care to perfection. Deliverables... 1. PCB design in KiCad with matching LCSC Part # for easy manufacturing from JLCPCB 2. KiCad Design files, Gerber files, BOM and CPL for JLCPCB, 3D STEP file for the design. 3. HEX firmware and GCC based source codes for the board Timeline... 1. Hardware design - 10-12 Days 2. Prototype manufacturing at your cost - 1-2 weeks depending on JLCPCB 3. Firmware development and fine tuning - 2 Weeks Milestones... 1. After hardware design - 30% 2. After Firmware Development - 40% 3. After final testing at your side - 30%
₹120,000 INR in 21 days
7.3
7.3

With my extensive experience in Electronics and Embedded Systems, which includes skills in C, C++, Circuit Design, and Microcontroller Programming on platforms such as STM32 -- I am well-equipped to handle your Industrial Automation Embedded PCB Design project. I have a solid background in digital motor control, power electronics, and renewable energy, all of which aligns perfectly with the nature of your project. In terms of the key deliverables you seek, I have hands-on proficiency in KiCad for schematic capture and multilayer PCB layout matching with mechanical constraints. I can guarantee accurate component selection with second-source options as demanded by your requirements. My firmware skills will ensure that not only will the board read the oxygen sensor as needed, but it will also filter and linearize the signals in real-time before publishing the values over Modbus registers. The final output is guaranteed to have the necessary thresholds stored in EEPROM for effective use. Lastly, given my Matlab expertise in simulating hardware including power electronics and motor drives, your project's test procedures are also on steady ground. I will design a concise build & flash guide plus a thorough test procedure that you can easily replicate on the bench. The acceptance criteria won't be an issue either, from maintaining low idle current draw to stable data transmissions over a 12-hour period - let me optimize technology to accomplish that! Trust me with this 입니다
₹60,000 INR in 12 days
7.5
7.5

Hello, Your project aligns very well with my experience in industrial embedded systems. I have 14+ years of experience designing production-ready embedded hardware and firmware, covering the complete development cycle from schematic capture and PCB layout to firmware, manufacturing support, and validation. For this project, I can deliver a robust multilayer PCB (KiCad10) designed for reliable 24 V industrial operation, with careful component selection focused on long-term availability and second-source alternatives. On the firmware side, I'll implement the complete signal chain - oxygen sensor acquisition through the appropriate analog front end, digital filtering, calibration, EEPROM-based configuration, Modbus RTU over RS-485, TFT/OLED display interface, and configurable digital outputs for PLC integration. My background includes STM32, ESP32, Nordic, RS-485/Modbus RTU, industrial communication, analog sensor interfacing, low-noise PCB design, and production-ready embedded C/C++ firmware. I also believe in identifying potential risks early. If I see opportunities to improve the analog front end, EMC robustness, power supply design, or long-term maintainability, I'll discuss them before implementation rather than after the PCB is complete. I look forward to discussing your oxygen sensor specifications and mechanical constraints. Best regards, Jitendra Zala
₹70,000 INR in 10 days
5.6
5.6

HI, I am an experienced electronics and PCB Design engineer, specialised in use of ECAD software such as Altium Designer, KICAD, EasyEDA, etc. for the the design of electronics and PCB. I will design your projects to meet your Requirements and the industry standard. I do all kinds of circuits such as Power delivery circuit, Sensor Integrated Circuits, wireless control, MCUs etc. I will deliver the following. The Schematics for your Design The PCB for the design Bill of materials(If needed) Gerber, Pick and Place and other manufacturing and assembly drawings needed. Full Support and consultancy till the project is done. Kindly send me message for my previous designs and also so we can discuss further on your project I look Forward to working with you. Best Regards, Abdur-Rafiq
₹55,050 INR in 7 days
5.3
5.3

I am an Embedded Systems and PCB Design Engineer with experience in Altium Designer, Kicad, Easyeda, Protious and custom hardware development. I can design your PCB from schematic to production-ready files, including: • Schematic Design • PCB Layout • Component Selection • Design Rule Check (DRC) • Gerber Generation • BOM Preparation • Manufacturing Support (JLCPCB, PCBWay, etc.) I have experience with ESP32, STM32, sensor interfaces, power supplies, RF modules, Ethernet, and industrial electronics. Please share the project requirements, schematic (if available), board dimensions, and any special requirements. I can start immediately. Looking forward to working with you.
₹65,000 INR in 7 days
4.9
4.9

With extensive experience in industrial automation, I can assure you that I am the right fit for your project. I have worked on a variety of projects that involve intricate Embedded PCB designs, component selection, and firmware development – skills that are critical to your requirements. Having effectively utilized KiCad and Altium, I can flawlessly approach tasks such as schematic capture and multilayer PCB layout. On the software side, I have an in-depth understanding of C/C++ languages which will enable me to deliver robust STM32-based firmware with all desired functionalities – from reading the oxygen sensor to driving digital outputs based on user-defined thresholds stored in EEPROM. In addition, my familiarity with Modbus-RTU over RS-485 will facilitate seamless integration and stable data transmission. I've worked with various sensor types before and exceeded clients' expectations in regard to accuracy, precision, and repeatability. Further testament to my proficiency is the fact that I have developed projects that match your acceptance criteria; boards that pass strict tests and provide accurate readings. Lastly, my commitment to timely communication and quality work will ensure that any deviations or improvements from the spec are promptly discussed with you, ensuring collective satisfaction. For a successful project that meets your exact requirements, choose me!
₹56,250 INR in 7 days
4.7
4.7

Hi, I have 11 years of experience in embedded system engineering. I can help you design the PCB for your sensor and build the firmware compatible with modbus protocol and show some status in the display. please let me know the detail like sensor type, your mechanical constrains, threshold definition, and other stuff so we can talk more about it
₹75,000 INR in 7 days
4.6
4.6

Your oxygen sensor board is a clean industrial-automation problem — read one analogue signal, linearise it, drive two outputs, talk Modbus, fit a given enclosure. I've done this exact pattern before and I know where the traps are: noisy ADC readings from the RS-485 bus, calibration drift over temperature, and EEPROM wear from frequent threshold writes. Here's what I bring to this: → I built a Modbus-RTU gas sensor node on STM32F0 that reads a potentiostatic sensor, applies a third-order polynomial calibration, and publishes to a PLC over RS-485 — it's been running in a chemical plant for 18 months without a single Modbus frame error → I route 4-layer PCBs in KiCad with split analogue/digital grounds and isolated RS-485 — your ±2% sensor accuracy target is easily achievable with proper layout → Full-stack delivery: schematic, PCB, firmware (C on STM32 with HAL), BOM with second-sources, and a repeatable bench test procedure → I keep STM32 dev boards, RS-485 transceivers, and common op-amps in stock — I can start firmware bring-up on day one while the PCB design is being finalised My approach: → I'll review your sensor datasheet and enclosure drawing, then lock the MCU, ADC front-end, and isolated RS-485 interface with long-availability parts → I'll deliver Gerbers clean for JLCPCB, a BOM with verified alternates, and a one-page test procedure you can run on the bench Happy to walk you through my approach and past work on a chat.
₹38,500 INR in 2 days
3.5
3.5

Hi, I can design the complete industrial embedded PCB and firmware for your oxygen sensor monitoring/control platform, including analog front end, STM32-based processing, Modbus RTU over RS-485, display output, and PLC digital outputs. The best solution is to first review the oxygen sensor datasheet, signal range, calibration method, enclosure footprint, 24V supply requirements, output thresholds, display preference, and Modbus register map. I’ll then design the schematic, PCB, BOM, and firmware around reliable industrial operation. I’m comfortable with KiCad/Altium, STM32 firmware, analog sensor interfaces, filtering/linearization, EEPROM settings, RS-485/Modbus RTU, TFT/OLED displays, 24V industrial inputs, digital outputs, BOM planning, and JLCPCB-ready files. Deliverables will include: * Schematic and multilayer PCB * Gerber and drill files * BOM with second-source options * Oxygen sensor analog front end * STM32 C/C++ firmware * Real-time filtering and calibration logic * Modbus RTU registers * TFT/OLED display status * Threshold-based digital outputs * EEPROM configuration storage * Build, flash, and bench-test guide I’ll focus on reliable industrial design, clean firmware, stable Modbus communication, and manufacturing files ready for prototype production. Best regards Ankit
₹37,500 INR in 7 days
3.7
3.7

I can take this project from initial concept through to production-ready hardware and firmware. I have experience developing industrial and connected embedded systems, including PCB design, firmware development, and sensor integration. For this project, I would design the analogue front end for the oxygen sensor, handle calibration and signal processing, and develop the supporting circuitry for the 24 V supply, display, digital outputs, and RS-485 communication. The goal is to create a well-integrated system rather than a set of loosely connected parts. The deliverables would include the schematic, PCB layout, a carefully selected bill of materials with alternative components where appropriate, and all manufacturing files. I would also provide the firmware, including Modbus communication, configurable settings stored in non-volatile memory, and a clear procedure for testing and programming the boards. Before starting the layout, I would review the requirements in detail. It’s important to confirm aspects such as output behavior, EMC conditions in the cabinet, isolation needs, and how sensor faults and calibration should be handled. Addressing these early helps avoid issues later, especially in environments with electrical noise and long cable runs. The end result would be a well-documented design that is ready for prototyping and testing.
₹65,000 INR in 7 days
3.6
3.6

Hi, I’m Saswata Mukhopadhyay. I have hands-on experience in electronics hardware and embedded coding, and I’d be glad to help with your project. I work with ESP32, STM32, Arduino, Raspberry Pi, sensors, communication protocols, and firmware development. I can support both hardware design/integration and coding/debugging, depending on your requirement. I focus on practical implementation, stable performance, and proper testing. If you share the project details, I can review it and help you build a reliable solution.
₹45,250 INR in 7 days
2.9
2.9

Your industrial oxygen monitor board is exactly the kind of focused, real-world project I enjoy sinking my teeth into. I like that you've already thought through the acceptance criteria and the mechanical constraints — that tells me we can move fast without guesswork. Here's what I bring to this: → I recently shipped a similar STM32-based Modbus sensor node that reads a chemical sensor, linearises the output, and drives a 4-20 mA loop — the filtering and calibration logic maps directly to your oxygen sensor requirements → I handle the full stack: schematic, PCB, firmware (C/C++ on STM32), and the build guide — you get everything from one person → I keep a stock of common STM32 parts and RS-485 transceivers, so I can start prototyping immediately while we finalise the sensor selection My approach: → First I'll review your sensor datasheet and enclosure drawing, then propose the exact MCU, op-amp, and isolation components with second-source options noted For this scope, the cost would be $37500— I'm quoting on the lower side because the requirements are well-defined and I have the core firmware blocks ready from past work. Happy to walk you through my approach and past work on a chat.
₹37,500 INR in 5 days
3.3
3.3

Hello, I can design the complete embedded hardware and firmware solution for your industrial oxygen monitoring system, from schematic capture through production-ready PCB and firmware. Using KiCad (or Altium if preferred), I'll develop a multilayer PCB that fits your mechanical constraints while ensuring robust power distribution, analog signal integrity, and reliable RS-485 communication. The design will include the oxygen sensor analog front end, display interface, digital outputs, EEPROM storage, and all required protection and interface circuitry. The firmware will be developed in C/C++ for STM32, with real-time sensor acquisition, filtering and calibration, Modbus RTU communication at 9600 N81, configurable threshold outputs stored in non-volatile memory, and a clear, maintainable software architecture. The final deliverables will include the complete editable design files, production-ready Gerber package, BOM with alternate components, firmware source code, build/flash guide, and a repeatable test procedure. Throughout the project, I'll review the sensor datasheet and enclosure constraints early to optimize the design for reliability, manufacturability, and long-term component availability while minimizing design iterations. I look forward to discussing the project requirements and delivering a production-ready solution. Best regards, Anjali
₹60,000 INR in 30 days
3.0
3.0

Hello, I have experience in embedded systems, PCB design, industrial electronics, and firmware development. This project is well aligned with my expertise. I can develop the complete solution including the analog front-end, embedded firmware, Modbus RTU communication, OLED/TFT interface, digital outputs, schematic, multilayer PCB, Gerber files, BOM, and documentation. I focus on component availability, maintainable firmware architecture, and manufacturable PCB layouts. I would be pleased to discuss the sensor specifications and mechanical constraints so we can finalize the design before implementation. One question: Will the oxygen sensor interface require factory calibration only, or should the firmware also support user field calibration?
₹58,500 INR in 21 days
2.2
2.2

Hello, Your project aligns well with my experience in embedded hardware and industrial control systems. I can handle the complete development process, including schematic design, multilayer PCB layout, BOM preparation with alternative components, and production-ready STM32 firmware. I have experience with analog sensor interfaces, signal filtering, calibration, Modbus RTU over RS-485, EEPROM parameter storage, and TFT/OLED displays. I’ll ensure the design is reliable, manufacturable, and meets your acceptance criteria. Once you share the oxygen sensor datasheet and mechanical constraints, I’ll review the requirements and propose the most suitable hardware architecture before starting development.
₹37,500 INR in 7 days
2.2
2.2

With a genuine excitement combined with honed and applicable skills, I believe I'm the perfect fit for your Industrial Automation Embedded PCB Design project. My extensive experience mastering real-world engineering issues will guarantee that all aspects from component selection to the firmware itself are well considered. Additionally, my unique perspective as a multidisciplinary engineer means I approach your project as a complete system rather than disparate parts, leading to increased efficiency and reliability. My proficiency in CAD design ensures that even under strict mechanical constraints, I can deliver an optimized and production-ready solution. Furthermore, I'm well versed in electronic systems, comfortable working from schematic capture to hardware integration and reliable communication setups. On the software side, my ability to develop C/C++, firmware and control logic for embed devices - along with experience in PLCs and industrial communication protocols - makes me thorough and versatile in integrating hardware and software systems. Setting me apart is my capacity for seamless collaboration with cross-functional teams, guaranteeing accurate communication and successful delivery.
₹150,000 INR in 25 days
1.1
1.1

Hi. thanks for posting this job. I am excited to help Industrial Automation Embedded PCB Design I understand the project goals and expected outcome. Want I will meet deadlines. keep you updated. and deliver high quality work. I’m offering best quality and highest performance at lowest price I am an expert with 10 years of experience in C Programming, C++ Programming reach their goals. . I have helped many clients bring ideas to life and reach their goals. You can view my portfolio at I invite you to start a chat so we can discuss your project in detail Thank you for considering my proposal. Warm regards, bhargav922002
₹52,500 INR in 3 days
0.4
0.4

HI, KINDLY READ THROUGH MY PROPOSAL The key here is keeping the oxygen analogue front end accurate inside a 24V industrial cabinet while maintaining clean RS-485. I'll design in Altium around STM32, isolation/protection, EEPROM thresholds and Modbus RTU, then deliver Gerbers, BOM and firmware after DRC and bench checks. Do you prefer isolated RS-485, or can we review grounding on a quick call?
₹38,000 INR in 5 days
0.6
0.6

Chennai, India
Member since Jul 20, 2026
₹1500-12500 INR
$10-150 CAD
min £36 GBP / hour
$30-250 USD
$30-250 USD
₹12500-37500 INR
₹12500-37500 INR
$30-250 USD
₹10000-150000 INR
₹600-1500 INR
$30-250 USD
$250-750 USD
$20000-50000 USD
₹3000-4000 INR
$30-250 USD
$10-30 USD
₹12500-37500 INR
$1000-3500 USD
min $50 USD / hour
₹1500-12500 INR
₹1500-12500 INR