Wearable IoT Device – Firmware, SIM7000G (LTE + GNSS), RF Tuning & System Validation

@Mahihassi

As an accomplished electrical engineer specialized in embedded systems, I bring a wealth of experience to the table for your wearable IoT project. With a Master's degree in Embedded Systems and a strong background in firmware development and PCB design, I am confident in my ability to take your PCB board to the next level, encompassing the power rail validation, sensor, IMU and PPG validation, connectivity with the SIM7000G LTE module, efficient power management for extended battery life, Scheduled timing logic for seamless functioning of sensors and GNSS module. I have prior experience working extensively with C/C++ which would come in handy while developing BLE GATT services and with SIM7000G AT commands for effective LTE data transmission. Moreover, I'm not only adept at making designs but also at understanding and fixing any problems or limitations they might pose. In terms of RF antenna tuning (VNA), power integrity debugging, and EMI troubleshooting if required for phase 3 of this project, I will bring my best expertise forward to ensure optimal antenna performance along with profound simulation, testing and integration of all radio devices present on board.

@hayteekeys

Hi, I understand you already have a fully assembled nRF52840 + SIM7000G wearable board and now need board bring-up, firmware completion, RF tuning, and system-level testing. I am a embedded engineer with nRF52, BLE GATT, SIM7000 (Cat‑M/NB‑IoT + GNSS), and RF tuning experience, I can take over from your previous engineer and deliver a field‑ready MVP. APPROACH (PHASED) - Bring‑up: Validate power rails, flash minimal FW, check sensors, BLE advertising, and SIM7000G LTE attach. - Firmware: Implement and integrate IMU/PPG/temp/GNSS drivers, JSON‑over‑BLE GATT, power management/sleep, and LTE data upload and scheduling. - RF: Tune LTE and GNSS antenna networks, verify BLE, and address EMI if needed. - Testing & Docs: Range, GNSS TTFF, LTE data, battery life tests + JSON logs, demo video, and concise documentation. DELIVERABLES - Production‑grade firmware - Final RF matching values - Test reports + logs + short demo video I can start quickly once I have your hardware files and a sample device.

@Adeel2k14

I am an electrical and embedded systems engineer with over 7 years of experience in embedded firmware, IoT devices, and production-grade PCBs. I have hands-on experience with nRF52 BLE development, cellular modules (including SIMCOM), sensor integration, power management, and system bring-up. I can take your existing hardware through board bring-up, complete firmware development, RF tuning, and full system testing. I am comfortable working with 4-layer RF designs, BLE GATT services, AT-command–based LTE communication, and wearable power optimization. I can deliver stable firmware, tuned RF results, test reports, and clear documentation with a fast and structured approach.

@manusharma2992

As an experienced embedded systems engineer with proficiency in C and C++, I'm well-versed in the kind of work that your project requires. My strength lies in the realm of electronics and PCB handling, making me proficient with your desired MCUs, especially the nRF52840 BLE used in your device. I see that your wearable IoT device has sensors like IMU, PPG, Temperature sensors, all of which I have previously worked on extensively. My mastery extends to incorporating these sensors into the firmware while ensuring power efficiency and sleep modes management. Lastly, my effective troubleshooting abilities coupled with exemplary problem-solving skills make me confident in identifying any issues that may arise during RF tuning or power management debuggging and resolving them effectively and efficiently. I ensure you that by selecting me, you get not only the much sought-after expertise but also a passionate professional who is willing to put forth every ounce of effort needed to bring your project to life.

@SMBelectronics

I’m Abbas from SMB ElectroTech. We’re an OEM/ODM electronics engineering firm that designs and delivers custom IoT and embedded hardware for startups, SMEs, and global teams. We specialize in precision PCB design, IoT sensor nodes, and gateways, and take products from concept through fully tested, production-ready hardware. Our clients work with us when they need engineering depth plus reliable manufacturing execution, without building an in-house team. If you’re working on an IoT or embedded product and need a dependable technical partner, I’d be glad to explore whether we’re a fit. Regards Abbas JawadWala SMB ElectroTech

@cesur135

With my extensive experience in embedded systems engineering and a range of microcontrollers, I am perfectly suited to take your PCB design to the next level. From board bring-up and firmware development to RF tuning and system testing, I have been involved in every essential part of your project's scope. My mastery of C/C++, as well as Bluetooth Low Energy (BLE) GATT services and SIM7000G AT commands is critical to successfully complete this task. The wearables and IoT industry has been my professional home for many years. In fact, in addition to having worked on numerous wearables projects similar to yours, I've also been involved in complex industrial automation projects such as waste water treatment plants where precise system software and effective SCADA management were essential - skills that align perfectly with your project needs. Lastly, I understand the importance of timely deliverables without sacrificing quality. This is why I guarantee not only a fully working firmware, but also tuned RF matching values, comprehensive test reports, JSON BLE data logs and a professional demo video- fitting for your sophisticated hardware design. Let me help you reclaim momentum for your wearable IoT device project starting right now.

@abdurRafiqM

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 so we can discuss further on your project I look Forward to working with you. Best Regards, Abdur-Rafiq

@abdf2010

Hello, I liked your project Wearable IoT Device – Firmware, SIM7000G (LTE + GNSS), RF Tuning & System Validation, which aligns perfectly with my professional expertise. I bring extensive experience in C Programming, Electronics, Microcontroller, I can ensure timely delivery within 3 days. I'm committed to exceeding your expectations and would welcome the opportunity to discuss your requirements in detail.

@hancho6319

Thank you for the detailed overview of your advanced wearable IoT project. I have extensive experience with the nRF52840 and SIM7000G modules, and my background in Embedded Systems and PCB design allows me to understand your hardware holistically. I am well-equipped to take over and complete this development. I propose a structured, four-phase approach mirroring your scope: Phase 1 (Bring-Up): I will validate all power rails, establish communication with the MCU, and verify basic sensor and cellular module functionality. This phase confirms the physical board is sound. Phase 2 (Firmware Development): I will develop the complete firmware stack on the nRF52 SDK, implementing drivers for all sensors, BLE GATT services for JSON data transfer, robust LTE data transmission via AT commands, and sophisticated power management with deep sleep modes to maximize battery life. Phase 3 (RF Tuning): Using a VNA, I will fine-tune the antenna matching networks for the SIM7000G (LTE/GNSS) and nRF52840 (BLE) to ensure optimal range and regulatory compliance. Phase 4 (Validation & Delivery): I will conduct comprehensive testing (range, TTFF, data integrity, battery life) and deliver the complete firmware, tuning reports, test logs, and a demonstration video. I am ready to begin with the provided schematics and board files.

@gurrammahesh429

I have carefully reviewed your project details and this is exactly the kind of wearable IoT bring-up and firmware completion work I specialize in. I am an embedded hardware & firmware engineer with strong hands-on experience in nRF52 BLE systems, cellular IoT modules, RF bring-up, and production-level board validation. Since your PCB is already fabricated and assembled, I can immediately focus on bring-up, firmware stabilization, RF tuning, and system validation without any redesign overhead.

@jayyx03

I’m a final-year Computer Science Engineering student with strong hands-on experience in embedded systems, IoT, and firmware development. I have worked with Embedded C/C++, BLE-based devices, sensor integration, and power-optimized firmware. I’m comfortable with nRF52 platforms, BLE GATT services, AT-command-based cellular modules, and structured JSON data transmission. I can handle board bring-up, firmware completion, RF validation support, and end-to-end system testing as outlined in your phases. I’ve delivered production-grade projects before—please check my profile reviews for reliability and technical depth. I’d be glad to take this device from assembled hardware to a fully validated, demo-ready product.

@jmuniu

I can deliver this project within the seven days deadline. I have deep experience in sensor integration and programming the sensors to read data repeatedly at a certain sampling rate. After reading data, I will program the logic to fit what you want the project to finally do depending on the data already read.

@ahmedh177

Hello, I’m a hardware and embedded systems engineer with 3 years of experience working on wearable and IoT devices, including board bring-up, firmware development, and system validation on production-grade PCBs. I’ve reviewed the project status and remaining milestones, and everything is clear and well documented, especially the bring-up, firmware, RF tuning, and validation phases. If you’re okay with it, we can start with a quick handover review and define the first bring-up steps to get the prototypes fully operational.

@mausamraj678

Hi, I’m an Embedded Software Engineer with hands-on experience in nRF52 (nRF52840), BLE GATT, SIM7000G (LTE Cat-M / NB-IoT + GNSS), and wearable IoT devices. I can take your board from bring-up to a fully validated system, including: Power rail validation and board bring-up nRF52840 firmware (BLE advertising, GATT services, low-power modes) Sensor drivers (IMU, PPG, temperature, GNSS) SIM7000G LTE attach, AT command handling, and data transmission RF tuning for LTE, GNSS, and BLE (VNA-based) Battery runtime optimization and system testing I’m comfortable working with 4-layer RF boards, power integrity issues, and debugging real hardware—not just writing code. I can deliver working firmware, tuned RF values, test reports, BLE JSON logs, and a demo video, as requested. Since hardware is already assembled and documentation is available, I can start immediately and move efficiently through the phases. Looking forward to helping you complete this device. — Mausam