
Closed
Posted
We are developing a portable, handheld research instrument that combines two measurement modalities in a single pen-form device: 1. ELECTRICAL IMPEDANCE SPECTROSCOPY (EIS) 4-wire (tetrapolar) configuration. Frequency sweep 100mHz to 200kHz. Phase angle resolution ≤ 0.1°. Impedance range 10Ω to 10MΩ. Precision analog front-end IC (SPI interface). Shielded cable connector for external probe (Lemo or circular DIN, IP44). 2. OPTICAL SPECTROSCOPY Hamamatsu C12880MA MEMS spectrometer (SPI). Multi-wavelength LED driver: 4 channels (405 / 530 / 625 / 850 nm), sequential, PWM-controlled, current-regulated ±1%. SMA905 fiber optic connector. This project centres on a single-board solution that brings electrical impedance spectroscopy and optical spectroscopy together for chemical and wet-lab work. The heart of the design is a precision 4-wire analog front-end that must resolve phase-angle bioimpedance from 100 mHz up to 200 kHz with very low drift and noise. That accuracy takes priority over every other subsystem, so component choice, guard routing, Kelvin connections and calibration hooks all need special care. Beyond the impedance path, the board has to host a Hamamatsu C12880MA MEMS spectrometer over SPI, plus a four-channel LED driver delivering 405 nm, 530 nm, 625 nm and 850 nm illumination. The digital side funnels data out via MQTT and ultimately into an SQL back-end, so the MCU and network stack should be laid out for clean signal isolation and straightforward firmware bring-up. Power is supplied by a Li-Po pack with on-board fuel gauging, USB-C charging and 5 V/3 V rails sized for simultaneous analog, digital and LED loads. DELIVERABLES Schematic PDF · PCB layout source files · Gerber + drill files · BOM (MPN ) · Assembly drawing Acceptance is based on the analog front-end meeting its phase-angle accuracy targets, clean optical routing for the spectrometer, and a power section that maintains noise performance under worst-case load.
Project ID: 40483978
7 proposals
Remote project
Active 4 days ago
Set your budget and timeframe
Get paid for your work
Outline your proposal
It's free to sign up and bid on jobs
7 freelancers are bidding on average ₹1,271 INR/hour for this job

I am a skilled and reliable Embedded Systems Engineer with over 6 years of hands-on experience in Arduino, ESP32/ESP8266, and microcontroller-based development. I specialize in designing efficient, stable, and scalable embedded solutions, turning ideas into fully functional hardware-software systems. I have a strong background in electronics, sensors, communication protocols (UART, I2C, SPI, MQTT, WiFi, BLE), and real-time embedded systems. My development approach focuses on clean, well-structured, and well-documented firmware, ensuring long-term reliability and easy maintenance. I also provide thorough testing, debugging, and performance optimization, including power efficiency improvements where required. I am a detail-oriented engineer with strong problem-solving skills and extensive experience in hardware debugging and firmware optimization. Beyond technical expertise, I value clear communication, meeting deadlines, and maintaining high client satisfaction. I work closely with clients to fully understand project requirements and deliver high-quality results. Pricing is flexible and can be discussed based on project scope and complexity. I am open to both short-term and long-term projects. Let’s work together to build a professional, reliable, and efficient embedded system for your needs.
₹1,000 INR in 40 days
7.4
7.4

I’ve been doing embedded hardware design for over a decade, and I know firsthand that a PCB for a multimodal analyzer isn’t something you get right on the first pass without deep experience. I’ve shipped production boards for everything from BLE wearables on nRF52840 to ESP32-based vending machine controllers deployed at airports. I handle the full stack—schematic, layout, DFM, and firmware bring-up—so there’s no handoff risk between separate vendors. I can design a compact, noise-immune layout that keeps your analog and digital domains clean, and I’ll validate it with real hardware testing in my lab before you ever see a prototype. Let’s get your project moving on the right track.
₹1,000 INR in 40 days
3.3
3.3

I came across your project for the Portable Multimodal Analyzer PCB design and I have to say, it looks like a fascinating challenge. With six years of experience in embedded systems, I’ve spent a lot of time designing compact, multi-layer PCBs that balance performance with real-world constraints like power and signal integrity. I’ve worked on projects ranging from a smart golf ball with a custom 4-layer PCB that had to fit inside a 42mm enclosure, to a solar-powered RFID water vending machine that ran completely offline in the Kalahari desert. For your analyzer, I’m confident I can bring that same hands-on approach to create a reliable, manufacturable design that meets your exact specifications. I’d love to discuss the details and see how I can help bring this to life.
₹900 INR in 40 days
3.0
3.0

With over 15 years of comprehensive experience in the software development field, my team and I are highly capable of taking on complex tasks like this PCB design project. In addition to our long experinece we have expertise in Python Scaping and Automation, Stock Trading Software and Product Scrapping which any be used beneficially. While we do not have direct experience in PCB design specifically, we have an extensive amount of experience in hardware-related projects such as SQL server database Performance enhancement and Android Develoment. This would assure you that we can adapt quickly to the technicalities this project requires. We would bring dedication and consistency to this project. We believe that our punctuality combined with your leading instructions will bring about success. We assure 100% satisfaction while delivering the best possible results. In conclusion, our impressive blend of skills , make us a perfect fit for your project. Now more than ever my means to being available 24*7 will come in handy in case there are any changes or queries in near future. I am looking forward to hear from you soon. Thank you for your time and consideration. Priyanka
₹1,000 INR in 40 days
2.2
2.2

A dedicated MS SQL Database Administrator with 9.5+ years of experience, Including 4+ Experience of Technical Lead. Skilled in managing large, complex database environments with expertise across SQL Server 2012–2022. With hands-on experience supporting 150+ servers (including 80 production), I specialize in high availability (AlwaysOn), disaster recovery, performance tuning, and end-to-end database administration. Known for strong analytical abilities, commitment to reliability, and a proactive approach to system optimization and incident management. Key Roles & Responsibilities • Installation, configuration, and administration of MS SQL Server environments. • Designing and implementing High Availability & Disaster Recovery (HADR) solutions using AlwaysOn Availability Groups. • Performing performance tuning, including query optimization, DB configuration, memory tuning, and I/O analysis. • Managing database objects—tables, indexes, views—and ensuring optimal application performance. • Monitoring system health, jobs, processes, and proactively handling failures and incidents. • Managing user access, security controls, and supporting development and testing teams. • Ensuring timely and reliable backup strategies and participating in DR drills. • Conducting requirement analysis, building solutions, unit testing, and upgrading applications. • Providing production support, incident management, problem resolution, and coordination with users and stakeholders
₹1,000 INR in 40 days
0.0
0.0

I am an R&D Electrical Engineer specializing in custom multi-layer PCBs, embedded systems, and full-stack IoT telemetry. This handheld dual-modality spectrometer aligns perfectly with my active project portfolio. My relevant hands-on experience includes: Precision Analog & PCB Design: I design industrial-grade hardware with strict analog/digital isolation. To achieve the ≤ 0.1° phase resolution for the 4-wire EIS, I will integrate a dedicated precision AFE (e.g., AD5940) utilizing true Kelvin connections and proper guard routing. IoT & Network Stack: I develop end-to-end telemetry systems using ESP32/STM32 microcontrollers. I can efficiently manage the SPI interface for the Hamamatsu C12880MA and funnel the continuous data stream via MQTT directly to your SQL backend. Power Electronics & LED Drive: I have engineered high-power systems, including a 1.2kW SMPS for commercial HVAC. Designing your Li-Po fuel gauging, ultra-low noise 5V/3V analog rails, and the ±1% PWM constant-current LED drivers is well within my standard engineering practices. I don't just design the circuit; I deliver the complete, production-ready hardware-firmware architecture. I am ready to review the mechanical constraints for the pen-form enclosure and start architecting the schematic. Let’s connect to discuss the MCU selection and IP44 connector details.
₹1,000 INR in 40 days
0.0
0.0

Tikari, India
Member since Mar 6, 2025
₹600-1500 INR
$10-30 USD
$1500-3000 AUD
$500-600 USD
₹1500-12500 INR
₹750-1250 INR / hour
$750-1500 CAD
$25-50 USD
$30-250 USD
$30-250 CAD
₹12500-37500 INR
₹10000-14000 INR
₹1500-12500 INR
€250-750 EUR
$250-750 USD
₹1500-12500 INR
$250-750 USD
₹12500-37500 INR
$250-750 USD
€8-30 EUR
$30-250 USD