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Custom PCB Design for IoT and Electronics Projects esp32,esp8266 I have experience in PCB design and layout for embedded systems, IoT devices, and custom electronics. From schematic capture to Gerber file generation, I ensure every design is optimized for performance, reliability, and manufacturability. Whether you need a prototype PCB for testing or a production-ready design, I can help bring your ideas to life. You can check out my personal projects.

I am a Senior Embedded Firmware Engineer with 11+ years of hands-on experience designing, developing, and optimizing reliable firmware for connected and embedded systems. I specialize in wireless communication technologies, low-level firmware, and embedded Linux, delivering production-ready solutions for consumer, industrial, and IoT products. 🔹 Core Expertise Wireless Technologies: Wi-Fi, Bluetooth Low Energy (BLE), Zigbee, Thread, Mesh networking Operating Systems & Platforms: Bare-metal, FreeRTOS, Embedded Linux Microcontrollers & SoCs: ESP32, STM32, Nordic NRF series, Renesas MCUs Application Processors: NXP i.MX 6UL, i.MX 8 series 🔹 Embedded Linux & Low-Level Development Linux device driver development Linux user-space application development Bootloader development and customization (U-Boot) Board bring-up, BSP development, and hardware debugging Experience with Yocto / Buildroot based systems 🔹 What I Deliver Clean, scalable, and well-documented firmware Robust wireless connectivity with optimized performance and power consumption End-to-end development: from board bring-up to production firmware Debugging and optimization using JTAG, logic analyzers, oscilloscopes Strong focus on stability, security, and long-term maintainability 🔹 Additional Strengths Deep understanding of MCU peripherals, memory optimization, and low-power design Experience working with cross-functional teams (hardware, QA, manufacturing) Comfortable with Agile development and version control (Git) Ability to quickly understand legacy code and improve existing systems If you’re looking for a reliable senior embedded engineer who can take ownership of your product and deliver high-quality firmware on time, I’d be happy to discuss your project.

Embedded Systems Architect | ESP32, nRF52/nRF54, STM32, Real-Time Systems I design and debug real-time embedded systems where multiple microcontrollers, sensors, and communication layers must work reliably under real-world constraints. My core expertise includes embedded firmware, low-level communication, sensing systems, and distributed edge devices built around ESP32, nRF52/nRF54, STM32, Raspberry Pi, Embedded Linux, BLE, LoRa/LoRaWAN, MQTT, SPI, UART, I2C, RTOS, UWB, and radar-based sensing. I’m strongest when a project involves: - Multi-MCU coordination - Low-level communication debugging - Sensor integration such as radar, GPS, IMU, capacitive touch, or industrial interfaces - Edge gateways and cloud-connected embedded systems - Turning an unstable prototype into reliable product behavior What I do best - ESP32 / ESP-IDF firmware development - nRF52 / nRF54 firmware using Zephyr and nRF Connect SDK - STM32 embedded firmware and real-time system design - FreeRTOS, Zephyr, and CMSIS-RTOS v2 architectures - BLE, LoRa/LoRaWAN, MQTT, and multi-device coordination - Low-level debugging across SPI, UART, I2C, BLE, RTOS, and custom buses - Embedded Linux / Raspberry Pi edge gateway systems - Node-RED, Balena, Docker, and remote deployment workflows - Radar, UWB, and real-time sensing/control systems - Industrial IoT integration and system reliability hardening Highlights - Ported production firmware from ESP32 to nRF54L15/Zephyr, including BSP, communication layers, BLE transport, and OTA/DFU support - Worked on distributed multi-controller systems using ESP32, nRF, and STM32 - Integrated TI IWR6843 mmWave radar for presence sensing and spatial event handling - Brought up UWB ranging (DW3000) on STM32 in a multi-device system - Built ESP32 + Raspberry Pi edge systems using MQTT, Node-RED, Balena, and remote deployment workflows - Built LoRaWAN-based tracking and monitoring systems with cloud dashboards and alerting - Supported industrial IoT deployments involving automation, CI/CD, remote monitoring, and field reliability Relevant Experience - Commercial Embedded Sensing & Control Platform (NDA): ported production firmware from ESP32 to nRF54L15/Zephyr; integrated BLE with encrypted transport, external flash, and MCUboot OTA/DFU; improved custom wired communication reliability; contributed to radar-based sensing and multi-device coordination - Industrial IoT Gateway Systems: built ESP32 sensor node + Raspberry Pi gateway architectures with real-time edge processing, MQTT communication, and remote configuration - Tracking, Monitoring & Edge Integration: built telemetry and monitoring pipelines for distributed edge devices using LoRaWAN, Balena, Node-RED, Supabase, and cloud dashboards - Industrial Integration & Automation: worked with Phidget-based interfaces, Yaskawa robot-related connectivity, Node-RED automation flows, CI/CD, and Balena-based deployment - Automotive Embedded Foundation — Hella: 4+ years in automotive embedded systems; worked on body control and electronic power steering programs with AUTOSAR, MISRA-compliant embedded development, CAN/LIN, diagnostics, requirement derivation, software architecture, IBM Rhapsody, and TPT Tech Stack - MCUs / Platforms: ESP32, nRF52, nRF54, STM32, Raspberry Pi, Embedded Linux - RTOS / Frameworks: ESP-IDF, FreeRTOS, Zephyr, nRF Connect SDK, CMSIS-RTOS v2 - Protocols / Interfaces: SPI, UART, I2C, BLE, LoRa/LoRaWAN, MQTT, CAN, LIN - Specialized Areas: UWB / DW3000, TI IWR6843 mmWave radar, OTA / DFU, PLC-style communication, Protocol Buffers / nanopb - Languages: C, C++, Python If your project involves firmware, sensing, real-time communication, edge gateways, industrial IoT, or multi-device embedded systems, I can help design, debug, and harden it for real-world use.

I am an embedded systems specialist with over 8 years of experience in developing software, firmware, and hardware solutions. I’ve successfully delivered 100+ projects that integrate cutting-edge functionalities—from multi-threading and AI-on-edge to seamless wireless connectivity. ------------------------------ Core Competencies: ➡️ Microcontrollers -- Proficient with TI, STM32, ESP32, ESP8266, Atmega, and a wide range of Arduino boards. ➡️ Frameworks -- Expertise in bare-metal programming, FreeRTOS, STM32Cube, ESP-IDF, Arduino, and PlatformIO. ➡️ Linux -- Experience developing on x86, ARM, and Raspberry Pi systems. ➡️ Electronics -- Skilled in sensor integration, display management, and PCB design. ➡️ Wireless Protocols -- Deep knowledge of Bluetooth Low Energy (BLE), WiFi, Xbee, Zigbee, ESP-Now, LoRa, low-frequency radio, and mesh networking solutions. ➡️ Wired Protocols -- Familiar with SPI, I2C, RS232, RS485, UART, CAN-Bus, and more. ➡️ UI Frameworks -- Proficient in creating graphical interfaces using bare-metal techniques, LVGL, and Qt QML. ➡️ Platform integration -- Experience integrating embedded systems with cloud platforms and IoT solutions such as AWS IoT, Azure, and ThingsBoard, utilizing MQTT, REST, and other gateway protocols. ------------------------------ Project Highlights: ✅ Real-Time Multi-Threading -- Implemented robust solutions using FreeRTOS. ✅ AI-on-Edge -- Integrated AI functionalities into constrained embedded environments. ✅ Wireless Connectivity -- Delivered projects with WiFi, BLE, LTE, LoRa, Zigbee and others. ✅ Advanced Networking -- Developed mesh networking solutions implemented over a variety of protocols like ESP-Now, Radio, BLE, XBee, etc. ✅ Power Management -- Utilized deep-sleep modes, watchdog timers, and ULP cores for energy efficiency. ✅ User Interfaces -- Designed intuitive touch interfaces and captive portals, often paired with companion mobile apps. ✅ Device Management -- Executed comprehensive device management strategies, including OTA updates, fault recovery, and remote monitoring. ------------------------------ What I Offer: 💾 Firmware Design: With 8+ years of coding expertise, I provide rapid and reliable firmware development tailored to your hardware. ☁️ Cloud Setup: I can setup your IoT Platform backend including Amazon AWS, Azure, and even open-source solutions like Thingsboard. ⚡ Hardware Engineering: From schematics and circuit design to component selection and PCB layout, I cover the entire hardware development lifecycle. 📱 GUI Integration: Specializing in embedded products with graphical user interfaces, I leverage LVGL and Qt to create user-friendly, visually appealing designs. ------------------------------ I am passionate about exploring new technologies and continuously expanding my expertise. While I may not know every technology off the bat, I commit to learning what’s needed—without charging for my learning time. I’d be delighted to discuss your ideas and explore how we can bring them to life. Best Regards, Ravi Kharb

I help companies design, develop, debug, and productionize reliable embedded products - especially when the challenge involves Bluetooth Low Energy, battery life, device security, wireless connectivity, or complex firmware. I have 17+ years of embedded systems experience and lead ByteSpectrum Technologies. I remain directly involved in architecture, firmware development, debugging, technical decisions, and client communication. When required, I can bring additional ByteSpectrum hardware or mobile expertise into the project. Architecture → Hardware Bring-up → Firmware → Connectivity → Security → Validation → Production → Field Support ━━━━━━━━━━━━━━━━━━━━ 🏆 VALIDATED ENGINEERING RESULTS ━━━━━━━━━━━━━━━━━━━━ → 7 days of operation from a 19 mAh rechargeable battery → ~6 months of operation from a single coin cell → 250-node self-forming, self-healing wireless mesh network → 210-cell / 756 V EV battery-management architecture ━━━━━━━━━━━━━━━━━━━━ 🎯 CORE EXPERTISE ━━━━━━━━━━━━━━━━━━━━ 🔵 Bluetooth Low Energy (BLE) Extensive experience with Nordic nRF52 / nRF53 / nRF54, TI, and Silicon Labs platforms. • Custom GATT services • Sensor and high-rate data streaming • Secure pairing / bonding • BLE provisioning • OTA / DFU • Multi-device communication • BLE gateways • Custom BLE / multiprotocol mesh networks 🔋 Low-Power Embedded Systems Battery-powered wearables, healthcare devices, trackers, and sensors using: • Deep sleep and event-driven firmware • Sensor-based wake-up and ULP techniques • Battery profiling and power optimization 🔐 Embedded Device Security Security architecture and implementation including: • Secure BLE • Device-specific key provisioning • X.509 certificate provisioning • TLS / DTLS • Application-level encryption • Protected credential storage • Firmware validation and secure OTA ━━━━━━━━━━━━━━━━━━━━ 💻 EMBEDDED FIRMWARE DEVELOPMENT ━━━━━━━━━━━━━━━━━━━━ Production-grade C/C++ development across Bare Metal, FreeRTOS, Zephyr, ThreadX, and Embedded Linux. • Device drivers, BSP, and bootloaders • OTA / FOTA • RTOS architecture • Sensor and peripheral integration • Board bring-up and prototype validation • Diagnostics, logging, and CPU/task profiling • Performance optimization • Long-duration testing • Production and field debugging ━━━━━━━━━━━━━━━━━━━━ 📡 IoT & MULTI-CONNECTIVITY ━━━━━━━━━━━━━━━━━━━━ Experience developing connected products and gateways combining: BLE | Wi-Fi | Ethernet | Cellular | LTE-M | NB-IoT | Zigbee | Thread | NFC | RFID | CAN | Modbus Typical systems include: • BLE-to-cloud gateways • Multi-device BLE aggregation • Ethernet/Wi-Fi with cellular fallback • Local socket communication • Device provisioning • Secure remote connectivity • Gateway and connected-node OTA ━━━━━━━━━━━━━━━━━━━━ 🌐 INDUSTRIAL ETHERNET & NETWORKING ━━━━━━━━━━━━━━━━━━━━ Hands-on experience with STM32H7 + ADIN2111 based 10BASE-T1L / Single Pair Ethernet systems. • Daisy-chain / line topology • Ethernet ring redundancy • IPv4 / IPv6 • lwIP / NetX Duo • FreeRTOS / ThreadX • Multi-node communication • UDP diagnostic protocols • Browser-based diagnostics • Network performance profiling • Long-duration validation ━━━━━━━━━━━━━━━━━━━━ ☁️ AWS IoT & CLOUD CONNECTIVITY ━━━━━━━━━━━━━━━━━━━━ Strong device-side AWS IoT Core integration experience: • MQTT / MQTTS • X.509 certificates • Device profiles and credentials • Provisioning • Telemetry and remote commands • Secure device-to-cloud communication ━━━━━━━━━━━━━━━━━━━━ 🏭 PRODUCT EXPERIENCE ━━━━━━━━━━━━━━━━━━━━ • Wearables & healthcare devices • ECG and physiological monitoring • Sports & fitness technology • Industrial IoT systems • Smart metering • IoT and cellular gateways • Asset tracking • Automotive & EV electronics • Battery Management Systems • Home automation • BLE / ANT / Zigbee / Thread networks • 10BASE-T1L industrial networks ━━━━━━━━━━━━━━━━━━━━ ⚙️ PLATFORMS & FRAMEWORKS ━━━━━━━━━━━━━━━━━━━━ Nordic: nRF52 | nRF53 | nRF54 | nRF91 Espressif: ESP32 | S2 | S3 | C3 | C6 | H2 Others: STM32 | Silicon Labs EFR32 / EFM32 / BGM | NXP | TI Wireless MCUs | Raspberry Pi | BeagleBone ESP-IDF | nRF Connect SDK / Zephyr | nRF5 SDK | Gecko SDK | FreeRTOS | ThreadX | Embedded Linux ━━━━━━━━━━━━━━━━━━━━ 🚀 HOW I CAN HELP ━━━━━━━━━━━━━━━━━━━━ ✅ Develop a new embedded product ✅ Move a prototype toward production ✅ Debug and stabilize existing firmware ✅ Improve BLE reliability or throughput ✅ Optimize battery life ✅ Implement secure provisioning and OTA ✅ Develop IoT gateways and multi-connectivity devices ✅ Solve hardware/firmware integration issues ✅ Perform board bring-up and prototype validation ✅ Investigate difficult field and long-duration reliability issues ━━━━━━━━━━━━━━━━━━━━ I am most valuable when the challenge is not simply writing code, but understanding why the complete embedded system behaves the way it does - and making it reliable in real-world use.

I am an Engineering student looking to strengthen my skills and earn while doing it. I am experienced in designing IoT devices, automation, CAD designing, Embedded programming, Machine learning, and Robotic devices.