Isolated Voltage Measurement Circuit Design

@macroenergy

With over a decade of experience in the field of electrical engineering and circuit design, I am confident that my expertise is a perfect match for your isolated voltage measurement project. My skills extend to powerful software such as KiCad, Eagle, and MATLAB, and I'm well-versed in various programming languages required to create functional schematic designs Plug and play. I have tackled similar problems before, especially in PCB design and embedded system projects, where analog electronics proved crucial. In one such instance, I successfully implemented an isolated motor drive which ensured stable readings without compromising data quality. This experience has honed my ability to identify the most appropriate components (optocouplers, transformers etc.) for a given task. I assure you that if given this opportunity, I will deliver an updated schematic that respects your original design and addresses the isolation issue effectively. Additionally, I will explain the rationale behind every decision made, providing you with an accurate estimated output. Rest assured, your project will be complete only when you are satisfied with the stability and accuracy of the revised design on your bench.

@cpp2048

This is an interesting project. There are two primary approaches to achieve it. The first method uses two 2-channel ADCs for voltage and current sensing via Hall sensors in a galvanically isolated domain, requiring four similar channels in total. The second approach uses analog isolators, though this is less reliable for accurate power factor (PF) measurement. If PF measurement is required, I recommend using a microcontroller with a hardware FPU. This will handle the computational load and facilitate faster data collection. My bid includes schematic and PCB design in KiCad. The board requires careful routing for optimal SNR. The first approach is less cost-effective, as it demands significant signal conditioning and robust power supply rejection (PSR) planning. I would love to hear more about your intended budget and the specific application. This context will help me provide a more tailored solution.

@osamaelkomy

Hi. I have analyzed your current schematic involving the MCP3903 and the 4-channel voltage divider/Zener protection stage. To ensure the design is both robust and cost-effective, I suggest a brief breadboard validation of the front-end topology (testing with channel only). Depending on your specific signal requirements, I propose three optimized paths: 1. High-Precision Isolation (AMC1200)If your application involves high-voltage sensing where safety is paramount, the AMC1200 is the gold standard, but it requires an isolated DC-DC converter (e.g., B0505) for the high-side supply. 2. Simplified Current Sensing (ACS712)If the primary goal is current measurement, we can replace the shunt/B0505 combination with a Hall-Effect sensor like the ACS712. 3. Cost-Effective Differential Stage: For signals that do not require full galvanic isolation but have common-mode noise, a high-CMRR differential op-amp stage is the most efficient choice. This maintains the 24-bit precision of the MCP3903 while keeping the layout compact. To finalize the hardware architecture, could you please clarify: -The expected voltage/current range of the analog source? -Is galvanic isolation a strict safety requirement for this project? I can provide updated schematics and Proteus/LTspice simulations for these options once the parameters are confirmed. Looking forward to your feedback Regards Osama Elkomy

@Amidst

Hey there! I’m Alok, A PCB, Circuit and Mechanical designer with a passion for turning ideas into rock-solid, high-performance circuit boards. even expert on Python, C, C++ With nearly a decade of experience, I’ve tackled everything from compact consumer gadgets to complex industrial systems—always with a focus on precision, efficiency, and reliability. # Schematic & Layout Design – Clean, optimized, and manufacturable. # Component Selection & Library Management – No surprises, just the right parts for the job. # Reverse Engineering – PCB cloning, replication, and improvements. # Gerber, BOM & CPL Generation – Ready for seamless production. # DFM & DFA Expertise – Because great design means smooth manufacturing. # Multi-Layer, Flex, & High-Density PCB Design – Whatever the project needs. If you need a PCB and Code that’s efficient, reliable, and built for real-world performance, let’s chat. I’d love to help bring your project to life!

@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.

@elect2eng

hi, This is interesting.. Are you measuring AC or DC? What we can do is to use one low cost micro controller per channel, like 8 pin PIC or ATTiny85 , it sends data digitally over an opto coupler to the main controller. it reads the values. You will need isolated power supply for each channel, so that its GND and the isolated power ground and the auxiliary micro controller ground can be common. I can give you circuit diagram and code for each micro controller. If you want the front end to be only analog type we can use VCO or some other analog circuits. What is the range of the input voltage and the accuracy you expect. you may need to calibrate each channel once at the beginning.

@teknoteam

Hi, it takes long because I do built the prototypes, so if you give me the specs (IE input voltage and required response time) I can make a test bench, you don't need to pay before the test is complete. I've already used, and I have spares, of an insulated DC-DC amplifier (-250 to 250 mV with a gain of 10) in that should fit but -again- I need your specs since from schematics is not very clear since there are no values for d1,d2,d3. Texas Instrument's AMC series should fit your requirements, but is necessary to get the exact specs. I can provide schematics in KICAD or EAGLE, your choice. If you like we can have a chat so I can get the exact needs. Cheers, Alex.

@yaroslavmark

Hi, I’m an electronics engineer with 8+ years of experience designing precision analog front-ends and isolated measurement systems for industrial electronics. I have developed 120+ production PCBs and several isolated sensing circuits using isolation amplifiers and delta-sigma ADCs, achieving <0.2% measurement error and stable readings in systems with hundreds of volts of common-mode difference. I also reviewed the PDF schematic you attached and understand the floating-ground measurement issue. Approach ✅ I will review your schematic and voltage ranges, then select the most appropriate isolation method (isolated amplifier or isolated ADC + digital isolator) to accurately measure each floating DC rail. ✅ I will design a stable input stage with precision divider networks, RC filtering, and protection to eliminate drift caused by floating references. ✅ I will deliver an updated schematic (KiCad/Eagle/PDF) and a concise BOM with readily available components and recommended footprints. ✅ I will validate the circuit with quick SPICE simulations and estimate the achievable measurement accuracy and stability. I am looking forward to working with you. Best, Yaroslav

@beingmrme

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@tetianam8

⭐⭐⭐⭐⭐ Your problem is exactly what happens when an ADC tries to read voltages that live on floating, unrelated grounds. A resistor divider alone won’t fix that, because the Arduino still has no valid reference for those rails. The right solution is to treat each measured line as an isolated signal path and convert it into something the MCU can read safely and repeatably. In practice, I’d likely use one of these approaches depending on voltage range and accuracy target: • Isolated amplifier / isolated ADC per channel for best analog accuracy • Voltage-to-frequency or isolated sigma-delta approach for clean digital transfer • Optocouplers only if precision requirements are modest What I’ll deliver: Updated schematic showing a proper isolated sensing stage for each DC line Buyable BOM with current parts and practical footprints Short technical note explaining why it works, expected accuracy, and any limits Optional SPICE/simulation plots if useful I’ll also make sure the design fits your existing board style and power constraints rather than suggesting something overcomplicated. Quick questions: • What voltages are you measuring on each isolated line? • How many channels? • What accuracy do you need (ex. ±1%, ±0.1%)? • Are the lines DC only, or noisy/switched? This is a solvable problem, and the fix is mostly about choosing the right isolation architecture.

@ZainAbbas51862

Greetings Dear Hiring Manager I have read the description of your project and I understand everything. I am an expert in analog front-end design and galvanic isolation with extensive experience in solving ground-loop and floating-reference issues in Arduino-based sensing systems. I specialize in implementing high-precision isolated amplifiers and isolated Sigma-Delta modulators that allow for accurate DC voltage monitoring across independent power rails while maintaining complete electrical separation and signal stability. I am waiting on chat to discuss more and I am willing to start it now. Best Regards, Zain Abbas

@riab54

Hello, I can help you design a reliable isolated voltage sensing stage for your Arduino system. The issue you’re seeing is expected when measuring voltages from circuits with floating grounds, since the ADC requires a common reference. My approach will be to introduce proper galvanic isolation using precision isolation amplifiers (such as AMC1100 / similar devices) along with correctly sized voltage dividers and filtering stages. This will allow your Arduino to measure each DC rail safely and with stable, repeatable readings without tying the grounds together. What I will deliver: • A complete schematic compatible with KiCad showing the isolated measurement stage and all required connections • A concise bill of materials with readily available components and recommended footprints • Clear explanation of the design approach and expected measurement accuracy • Optional simulation plots demonstrating the behavior of the isolation stage The design will be easy to integrate into your existing board and will ensure accurate and safe measurements of floating DC lines. I can complete the work within 3–4 days.

@Zawiya3

With over a decade of experience in analog electronics, circuit design, and electrical engineering, I believe I am the ideal candidate to deliver a clean and reliable isolated voltage measurement circuit for your Arduino-based board. My skills in schematic capture and circuit design, as well as my knowledge of using isolated amplifiers, optocouplers, and transformers, place me in a unique position to solve your issue with inaccurate voltage readings due to floating grounds. I am proficient in KiCad and Eagle, and can readily provide you with an updated schematic that seamlessly integrates into your existing design. Additionally, my deep understanding of circuit simulation and analysis will allow me to illustrate the behavior of the proposed stage using SPICE or other relevant simulations to assure you of its effectiveness.

@joaquinc48

✅✅✅ Analog & Isolated Measurement Circuit Design Engineer ✅✅✅ Hi there, I have strong experience designing isolated analog measurement circuits for microcontroller systems, including Arduino-based boards monitoring floating DC rails. My work includes precision voltage sensing using isolation amplifiers, differential ADC front-ends, and robust filtering to achieve stable and accurate readings. My approach is to introduce a proper galvanic isolation stage—typically using precision isolation amplifiers or isolated ADCs—combined with a well-defined reference and filtering network. This ensures the Arduino measures stable voltages without tying grounds together while maintaining safety and accuracy. A few questions: What is the voltage range of the isolated DC lines? How many channels need isolation? What measurement accuracy or resolution are you targeting? I am ready to start immediately. Best regards.

@haseebsidd07

Hi there, I understand that you're facing challenges with inaccurate voltage readings due to floating grounds in your Arduino-based project. I can provide a robust solution that ensures stable, reliable isolation between your DC lines without tying reference points together, either through isolated amplifiers, optocouplers, or transformers. I'm Abdul Haseeb Siddiqui, an electrical engineer with over 6 years of experience specializing in Electronics, Microcontroller programming, Circuit Design, Embedded Systems, and PCB Design. I have a proven track record of delivering designs that meet precision requirements and maintain safety for microcontrollers. I will deliver: • An updated schematic compatible with your design. • A detailed and concise parts list with readily available components. • A rationale explaining the isolation approach with an accuracy forecast. You can review my portfolio here: https://www.freelancer.com/u/haseebsidd07 I'm excited to collaborate on this project to ensure accurate voltage readings. Thank you! Regards, Abdul Haseeb Siddiqui

@antonk52

✔✔✔Hold on!! Looking for a Developer Who Gets Results? Hire Me, Relax, and Watch Your Project Turn Into Success✔✔✔ Hello, Before jumping into solutions, I focus on fully understanding the goal of the project and the real problem that needs to be solved. Clear communication and quick feedback are the keys to finishing projects smoothly and on time. I always keep clients updated, share progress frequently, and stay available for real-time discussion when needed. This helps avoid delays and ensures the final result matches expectations perfectly. If you’re looking for someone reliable who treats your project seriously and focuses on delivering results, I’d be happy to discuss the details and get started. Let’s talk and make this project a success. Best Regars Anton

@hayleyc27

As an experienced electrical engineer with a proficiency in circuit design and a deep understanding of microcontrollers, I understand the complexity of your voltage measurement challenge. My extensive knowledge of Arduino boards and their DC rails, combined with my ability to work with precision using KiCad and Eagle, aligns perfectly with the task you need—designing an updated schematic for your existing board that will eliminate the issue of floating grounds while ensuring accurate readings. Throughout my career, I've tackled similar problems that required innovative solutions such as introducing isolated amplifiers and optocouplers. I'm confident that I can devise a unique, effective plan tailored to your specific needs.I'd also provide a concise parts list including values and practicable footprints, which would be important for the overall integrity of the design. In summary, my comprehensive skill set in circuit design, electrical engineering, and microcontrollers combined with my experience in creating accurate and reliable devices positions me to meet and exceed your project expectations. Let's collaborate to ensure you have a stable and safe measurement system that retains data integrity.

@seonaptic

I’ve worked on several projects involving measurement of electrical signals where the reference grounds are completely isolated from the controller. Situations like this typically require a carefully designed interface stage to ensure stable readings while maintaining proper electrical isolation and protecting the microcontroller. I can help you redesign the sensing stage so the Arduino can reliably measure those DC rails without tying the grounds together. The deliverables will include a clean schematic that can be integrated into your existing board, a practical bill of materials with components that are readily available, and a short technical explanation of how the solution works and what level of accuracy you can expect. If useful, I can also include simulation plots to illustrate the behavior. My focus will be on producing a robust and repeatable measurement solution that works reliably on the bench and is straightforward to replicate in your design tools (KiCad, Eagle, or annotated PDF). If you can share a bit more detail about the voltage ranges, number of channels, and any size or cost constraints, I’ll tailor the design accordingly. Looking forward to discussing the project. Best regards

@soumitrab22

Hi What you seek is a way to individually measure the voltage rails in isolation and i can help you do that with a small addition to your existing schematic. You wont need to tie the floating ground rails and this can be used repeatedly giving accurate results every time. Regards Soumitra