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J-Sensor V2 Hardware Design Specification Two Independent Circular PCBs – ESP32-H2 and ESP32-C6 ⸻ 1. Project Overview & Goals J-Sensor V2 is a second-generation hardware platform focused on accuracy, reliability, battery efficiency, and RF/thermal correctness, while remaining as small and round as physically possible. Two separate PCB designs will be produced: • V2-H2 → ultra-low-power Thread/BLE sensor • V2-C6 → Thread + Wi-Fi capable sensor Each PCB is independently optimized; no shared footprint constraints. ⸻ 2. Primary Hardware Objectives Stability & Measurement Accuracy • Minimize electrical noise affecting ToF and presence sensing • Stable ground reference under optical sensors • No thermal coupling from MCU or power stages into sensors Battery Life (Hardware Perspective) • Ultra-low leakage during sleep • Always-on wake sensor with µA-level current • Power-gated sensor domain for all high-current sensors • Support externally sized batteries per deployment Thermal & RF Optimization • RF antenna clear zones respected • Heat-generating components kept away from optical cluster • Board-level zoning for quiet vs noisy circuitry Form Factor • Circular PCB • Smallest manufacturable diameter • Front = sensors, Back = MCU + power ⸻ 3. Two Independent PCB Designs A) J-Sensor V2-H2 (Battery-Optimized Board) • MCU: ESP32-H2 • No Wi-Fi • Lowest possible idle current • Minimal RF keep-out • Smallest achievable PCB diameter • Optimized for long-life battery deployments B) J-Sensor V2-C6 (Wi-Fi-Capable Board) • MCU: ESP32-C6 • Thread + Wi-Fi + BLE • Larger RF keep-out and ground reference • Higher transient current support • Slightly larger PCB acceptable for RF stability ⸻ 4. PCB Form Factor & Zoning Shape & Size • PCB must be round • No decorative cutouts unless required for connectors • Each board minimized independently (H2 < C6) Side Assignment • Front side: All sensors • Back side: MCU, USB-C, charger, regulator, load switch, connectors Central Quiet Zone • The exact center of the PCB is reserved for the optical sensor cluster • Back side beneath this area must be: • Solid GND plane • No power traces • No switching components • No heat sources ⸻ 5. Power Architecture Supported Power Inputs Source Requirement USB-C Must power board and support MCU flashing Battery (external, wired) Flexible battery sizing per location Legacy 2-wire input Optional, removable if space constrained ⸻ Battery Input – Updated & Flexible Requirements The PCB battery connector must support externally sized batteries, allowing capacity to be chosen per installation. Electrical Requirements (What Any Battery Must Provide) The connected battery or pack must: • Present a single-cell-equivalent voltage range • Target input range: ~2.7 V to 4.5 V • Be capable of supplying ≥200 mA peak current without excessive voltage sag • Be connected via a wired connector (battery off-board) Supported Battery Examples • 14500 Li-ion (rechargeable) • CR123 / CR123A primary • Larger external Li-ion packs (e.g., 18650) if voltage is within range • External regulated packs providing ~3–4 V Charging Constraints • On-board charger is Li-ion only • Charger must be disabled or bypassed when using: • CR123 • Alkaline packs • NiMH packs • Any non-Li-ion chemistry • Hardware must include a physical selection mechanism: • Switch, jumper, or solder bridge to disable charging safely Result: The PCB does not restrict battery capacity or physical size — only voltage, peak current, and chemistry safety. ⸻ Power Rails Rail Description 3V3_MAIN Always-on rail (MCU + wake sensor only) 3V3_SENSORS Load-switched rail for high-current sensors Load Switch Requirements • Very low leakage • Controlled by MCU pin SENSORS_PWR_EN • Supplies: • VL53L7CX • OPT3001 • SHT40 ⸻ 6. Sensor Suite (Final Hardware Selection) Function Component Notes ToF Depth VL53L7CX Centered; requires XSHUT + INT Wake / Presence STHS34PF80 Always powered; RTC wake Ambient Light OPT3001 Optical access; INT wired Temp/Humidity SHT40 Perimeter placement MCU (H2 Board) ESP32-H2 Ultra-low power MCU (C6 Board) ESP32-C6 Wi-Fi capable ⸻ 7. Sensor Placement Rules (PCB-Only) Optical Cluster (Front, Center) • VL53L7CX at exact PCB center • STHS34PF80 within 2–5 mm of ToF • OPT3001 in same optical region • Back side under cluster: GND plane only Environmental Sensor • SHT40 placed near PCB perimeter • Isolated from: • MCU • USB-C • Charger • Regulator • High-current traces ⸻ 8. Electrical Interconnect Requirements I²C Bus • Single shared I²C bus • Pull-ups on 3V3_MAIN • Short, symmetric routing • Test pads required for SDA/SCL Control & Interrupt Lines Signal Direction Purpose WAKE_INT STHS → MCU Only deep-sleep wake source TOF_XSHUT MCU → ToF Hardware shutdown TOF_INT ToF → MCU Data-ready interrupt (not wake) ALS_INT OPT3001 → MCU Light threshold interrupt SENSORS_PWR_EN MCU → Load Switch Enable sensor rail ⸻ 9. RF & Thermal PCB Rules H2 Board • Minimal antenna keep-out • Smallest feasible PCB diameter • Lower decoupling and thermal demands C6 Board • Larger antenna clearance • More bulk capacitance • Additional ground stitching • Slightly larger PCB diameter acceptable Both • Antenna faces PCB rim • No copper or components in antenna keep-out • Power and USB isolated from sensor cluster • No heat under optical sensors ⸻ 10. Final Summary J-Sensor V2 hardware: • Uses two separate PCBs, each optimized for its MCU • Achieves long battery life via: • Always-on µA wake sensor • Power-gated ToF and environmental sensors • Allows battery capacity to be chosen per location • Imposes only electrical safety constraints, not physical battery size limits • Maintains sensor accuracy via strict grounding, thermal, and layout rules • Remains compact with a round, minimal PCB footprint
Proje No: 40067244
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Hello Sir, This is Sakib. I am professional Embedded System Engineer and PCB designer. Having experience on this platform 3+ years. I am quite familiar your problem that your talking about.I can give solution with perfection. Please appoint me to serve you Sir. please spare 10 minutes and take my interview and review my portfolio. kindly visit: https://www.freelancer.com/u/mozumder007 My IoT projects: *IoT base home automation system *IOT based health monitoring system *IOT based agricultural projet solution *IOT based Smart egg incubation system * Smart incubator with solar power *GSM based smart irrigation system *GPRS based fire alarm security system *GPS based vehicle tracking system *Smart traffic controlling system *Esp32 based antitheft door security system I have experience about [login to view URL] Design [login to view URL] Design & Layout making using the following softwares : ✔ Altium ✔ Autodesk Eagle ✔ Proteus ✔ Orcad ✔ KiCad etc [login to view URL] board: ✔arduino ✔esp32/8266 ✔stm32 ✔avr/pic ✔raspberry pi will provide - Professional solution - 100 % Satisfaction - In time and Budget - Professional Agreements Please allow me to complete your project and i am ensuring my best effort for this.I would love to hear more about what would make this project successful for you and explore if we would be good fit to work together.I am looking forward to your response and wish you all the best for you future.
$400 USD 15 gün içinde
7,8
7,8
29 freelancer bu proje için ortalama $429 USD teklif veriyor

As a dedicated and highly experienced electrical engineer, I believe I am the perfect candidate to undertake this challenging Ultra-Efficient Sensor PCB Design project that you have. Over the course of my 6-year career, I have specialized in delivering comprehensive engineering solutions that align with precise client specifications and maximize efficiency. My proficiency in Circuit Design and Electrical Engineering enables me to translate sophisticated concepts into tangible designs effectively. Hence, I can assure you of skillful execution of the independent PCB designs for the J-Sensor V2. Moreover, my expertise aligns perfectly with your workmanship goals to achieve stability, measurement accuracy, battery life optimization (especially during sleep), thermal & RF optimization, and form factor preference. My familiarity with designing circuit boards with minimized leakage and power-gated sensor domains for low-current sensors makes me a suitable fit for this project. Lastly, your project's battery requirements need not worry you when you entrust me with the design. With my skills in MATLAB SIMULINK simulations and CAD modeling using Solidworks and AutoCAD, I can ensure that your PCB is compatible with different battery sizes while maintaining its electrical integrity within the required voltage range—guaranteeing meaningful design versatility without compromising safety.
$250 USD 1 gün içinde
7,8
7,8

As an experienced and dedicated freelancer, I bring a fusion of skills and knowledge to this project that is specifically tailored to fulfill your needs. With a background in Digital Motor Control, Analog Design, Electronic Design, PCB design, PowerElectronics, Embedded systems and extensive use of Altium and Easyeda – I am confident to say that I can thoroughly meet all your Ultra-Efficient Sensor PCB Design requirements. From stable measurements to minimizing electrical noise, I will ensure the electrical components of my design do not affect the sensors’ Time-of-Flight (ToF) or presence sensing capabilities. Furthermore, I will keenly separate heat-generating elements of the Microcontroller Unit (MCU) from the sensors for optimal performance and consider RF antenna keep-out zones while ensuring board-level zoning for quiet vs noisy circuitry. It's also important that any battery you decide to connect must supply enough power without excessive voltage sagging. With my expertise in power electronics, I can design a battery connector that will support externally sized batteries with a single-cell-equivalent voltage range, allowing you to choose capacity per installation. My optimization skills extends even to charging where I can provide a physical selection mechanism like jumper or solder bridge to disable on-board charging- guaranteeing safety regardless of the voltage or chemistry
$250 USD 15 gün içinde
7,4
7,4

As an accomplished and skilled Electrical Engineer, I wholeheartedly embrace challenges like the J-Sensor V2 project. My robust experience in PCB design utilizing Eagle, Altium, KiCAD, and EasyEDA uniquely positions me to tackle this complex task. Additionally, my deep understanding of circuit design and proficiency in I2C communication gives me the edge needed for this project. In tackling your project, my overarching goal will be to deliver a circuitry design that maximizes stability, accuracy, efficiency and respects RF and thermal boundaries. Your main objective of battery-life optimization aligns perfectly with my expertise. I have hands-on experience in developing ultra-low leakage hardware that incorporates power-gated sensor domains for efficient battery management. Furthermore, the precision needed in shielding heat-generating components from optical sensors and observing importance of PCB form-factor is something I am deeply familiar with. Having successfully completed similar projects in the past while adopting these practices, rest assured that with me on board for this project you are backed by years of relevant experience which will translate into efficiency and value.
$500 USD 7 gün içinde
6,6
6,6

As an electronic hardware and firmware engineer with extensive experience in PCB design, I am confident in my ability to deliver on the specific needs of your J-Sensor V2 project. With a specialization in power supply circuits, multilayer designs for embedded systems, and RF PCB layouts, I have the expertise required to optimize for battery life, thermal stability, and RF performance. My history includes developing efficient LED driver circuits along with programming ESP32 and similar microcontrollers, which aligns closely to each J-Sensor variant's needs. Moreover, my competency in RF circuit design and analysis ties in well with the project's thermal and RF optimization objectives. By designing RF antennas clear zones while keeping heat-generating components away from optical clusters, I can help ensure you get optimal thermal balancing and signal strength consistently. Additionally, my understanding of wireless technologies such as Wi-Fi, Bluetooth, and ZigBee further enhances my compatibility with this project. Aspects like Thread and BLE are familiar territory for me.I believe my technical skills which encompass circuit design expertise (which will be immensely valuable for properly partitioning your front-sensors requirement) as well as electrical engineering mastery gives me a holistic grasp of the demands this project puts forth. Looking forward to collaborating on this forward-thinking venture!
$500 USD 7 gün içinde
6,5
6,5

Hi Jason L. Your project is very similar to my last project. So I have rich experiences on Thermal Analysis, Circuit Design, Prototyping, Electrical Engineering and I2C. I 'd love to share my experience with you. Best regards, Tab
$490 USD 4 gün içinde
5,1
5,1

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. Fell free send me message so we can discuss further on your project I look Forward to working with you. Best Regards, Abdur-Rafiq
$250 USD 7 gün içinde
4,1
4,1

Hello there! Our team at RedBrick American Engineering is well-versed in Circuit Design, Prototyping, and Electrical Engineering, ensuring top-notch solutions for the Ultra-Efficient Sensor PCB Design project. We will meticulously design two specialized circular PCBs, V2-H2 for ultra-low-power Thread/BLE sensing and V2-C6 for Thread, Wi-Fi, and BLE capabilities. With a focus on stability, accuracy, battery efficiency, and RF optimization, we guarantee a compact design with strict sensor placement rules and optimized power architecture. Let's commence promptly to deliver exceptional results. How can we assist you further with the project requirements?"clientQuestion Cheers, RedBrick American Engineering
$250 USD 3 gün içinde
3,8
3,8

Dear Jason, I am highly interested in delivering the Ultra-Efficient Sensor PCB Design project for the J-Sensor V2 platform. With over 13 years of broad engineering experience, including specialized expertise in electrical engineering, PCB layout, and circuit design, I am confident in meeting your stringent requirements. Your project's focus on ultra-low-power designs using ESP32-H2 and ESP32-C6, alongside critical constraints around noise minimization, thermal isolation, RF antenna clear zones, and strict power gating, aligns well with my skills. I have hands-on proficiency with I²C bus architecture, signal integrity, and power rail segmentation—ensuring sensor accuracy and stable ground referencing. I am committed to delivering detailed schematic capture, layout files, and comprehensive documentation consistent with your demanding functional and safety standards. I welcome the opportunity to leverage my cross-disciplinary engineering skills and attention to detail to successfully realize the J-Sensor V2 hardware vision. Thank you for your consideration. Best regards, mohand
$800 USD 7 gün içinde
3,0
3,0

Hi Jason, I’m excited about the opportunity to design the J-Sensor V2 PCBs, focusing on the ultra-efficient specifications you’ve outlined. My extensive experience in circuit design and thermal analysis equips me to create the two optimized, independent PCBs—V2-H2 for ultra-low-power and V2-C6 for Wi-Fi capability—while ensuring adherence to stringent electrical noise control and thermal zoning. I propose a timeline of 20 days to deliver initial designs, after which we can iterate as needed.
$250 USD 1 gün içinde
2,0
2,0

Hi Licensed Professional Engineer Here. Please check my freelancer profile , good reviews and Let's work together. Thanks
$500 USD 7 gün içinde
3,6
3,6

Hello, I’d be glad to assist with your project. I've checked your requirements(Ultra-Efficient Sensor PCB Design). I've completed similar projects in the past and can definitely help you. This project fits perfectly with my skills. I can provide the previous project upon request. All work is produced accurately, on schedule, and aligned with your local building codes. I can begin right away. Looking forward to helping you with this project. Best regards, Robert
$450 USD 3 gün içinde
0,0
0,0

Hello, I am a senior Japanese engineer for PCB and electronics. I will create two optimized, ultra-efficient circular PCBs for the J-Sensor V2, focusing on low power usage and stability. In previous projects, my designs improved battery life by up to 30%, with noise reduction enhancing sensor accuracy. My approach will seamlessly integrate with your requirements for both the H2 and C6 boards. I keep changes small and frequent so risk stays low. What specific design files or sketches can you provide to begin? I am ready to begin and deliver steady results. Thank you. Taiga Fujita, Senior PCB and electronics engineer.
$250 USD 5 gün içinde
0,0
0,0

Hi, Awesome! I recently completed a project exactly like Ultra-Efficient Sensor PCB Design, so I have strong experience with this type of work. I’d be happy to share my past results and show how I can help you. Thank you!
$250 USD 2 gün içinde
0,0
0,0

Hello, I’m excited about the J-Sensor V2 project, combining innovative PCB design with ultra-low power efficiency. With experience in circuit design and thermal analysis, I will deliver stable, reliable PCBs tailored to your specifications. Expect quick turnarounds and precision in functionality. What specific features or functionalities do you envision for the interactions between the two PCBs? Thanks, THE CALIFORNIA STUDIO
$250 USD 2 gün içinde
0,0
0,0

Hello! Jason L. I have read your project Ultra-Efficient Sensor PCB Design and as a licensed engineer checked detail carefully. I am very familiar with Electrical Engineering, Circuit Design, Thermal Analysis, I2C, Prototyping and I have rich experience in this fields for 12 years. I have finished similar project like this recently. Please contact me to discuss your project and start working on your project. Thank you. Chris
$500 USD 10 gün içinde
0,0
0,0

Hi there! hope you are doing great weekend! I understand that you require two independent circular PCBs for the J-Sensor V2, focusing on battery efficiency, measurement accuracy, and thermal optimization. My hands-on experience encompasses extensive PCB design, particularly in low-power sensor applications, ensuring stable ground references and ground planes to mitigate electrical noise. The most crucial part of this project is optimizing the power architecture and ground plane layout to ensure minimal leakage and accurate measurements. Effective zoning between the MCU and sensor components is vital for maintaining thermal and electromagnetic integrity. From my experience, I suggest using advanced thermal analysis during the design phase, along with adhering to strict zoning rules for signal integrity and thermal management. I'm excited and confident about delivering high-quality, efficient designs for both the H2 and C6 boards. Thank you!
$500 USD 5 gün içinde
0,0
0,0

Hi, I can assist you in designing the Ultra-Efficient Sensor PCB for the J-Sensor V2 hardware. To ensure accuracy, reliability, and battery efficiency, I will create two independent circular PCB designs for the ESP32-H2 and ESP32-C6 modules. Before proceeding, I would like to clarify: 1. Can you provide access to the current hardware design specifications or any existing PCB layouts? 2. Do you have any specific preferences for component sourcing or manufacturers for the PCB fabrication? Why choose us: - Expertise in designing compact and efficient PCB layouts for IoT devices - Extensive experience in optimizing power management and sensor integration - Proficient in meeting strict grounding, thermal, and layout requirements for sensor accuracy - Dedicated to delivering high-quality hardware solutions tailored to your project needs David W., I would like to discuss this project further with you. Let's connect to delve deeper into the requirements and kickstart this hardware design endeavor. Thanks!
$500 USD 7 gün içinde
0,0
0,0

Hello there We have strong experience in hardware design and PCB layout and can handle the full J-Sensor V2 project from specification to optimized PCB design. Our team has worked with ESP32 MCUs, low-power sensors, and circular PCB layouts, making us well suited to meet your accuracy, thermal, and RF requirements. We will design the V2-H2 and V2-C6 boards independently, ensuring minimal electrical noise, proper ground planes, and optimized power gating for ultra-low battery consumption. Sensor placement, RF zones, and thermal management will follow your detailed rules to maintain measurement accuracy and system stability. Our workflow includes creating detailed schematics, component placement, routing, and producing ready-to-manufacture Gerber files while keeping the PCB compact and round. Do you have preferred component suppliers or footprints you want us to use for these boards Best regards Future Station
$500 USD 3 gün içinde
0,0
0,0

Hello, I hope you are doing well. I am a hardware design engineer with expertise in creating compact, battery-optimized IoT PCBs for ESP32 platforms. Your J-Sensor V2 specification is detailed and excellent; I can deliver both the ESP32-H2 and ESP32-C6 circular PCB designs according to all your electrical, thermal, and RF requirements. My Approach: I will design the two independent PCBs in Altium Designer/KiCad, adhering strictly to your zoning rules (sensors on front, MCU/power on back), implementing the flexible external battery architecture with safe charging control, and optimizing each board for its target MCU's RF and power profile. I will produce full manufacturing files (Gerbers, BOM, assembly drawings). For This Complete Dual-PCB Hardware Design Project, my fixed-price quote is $3,500 - $5,500. This includes all schematic capture, layout, design rule validation, and necessary design revisions. I am ready to begin immediately to bring your optimized sensor platform to life. Best regards, Denis
$700 USD 10 gün içinde
0,0
0,0

Hi Jason L., How are you! I've carefully checked your requirements and really interested in this job. I'm a full stack Javascript developer working at large-scale apps as a lead developer with U.S. and European teams. I'm offering best quality and highest performance at lowest price. I can complete your project on time and your will experience great satisfaction with me. I'm well versed in React/Redux, Angular JS, VueJS, Node JS, Python, html/css as well as javascript and jquery. Simply, I have rich experienced in Electrical Engineering, Circuit Design, Thermal Analysis, I2C, Prototyping as you enumrated. For more information about me, please refer to my portfolios. I'm ready to discuss your project and start immediately. Looking forward to hearing you back and discussing all details. Thanks and Regards, Dragan M.
$300 USD 2 gün içinde
0,0
0,0

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