I'm an Embedded and Hardware Engineer with over 10 years of experience, specializing in taking projects from scratch to fully functional prototype PCB development. I handle all aspects, including circuit design, coding, component selection, PCB layout, and prototyping. Skills: Embedded Systems: ESP32, STM32, Microchip, NXP PCB Design: Altium, Eagle, Proteus Circuit Simulator Programming: Python, C, MySQL, C++ Circuit Design: IoT Devices IoT Network Routers Buck-Boost Converters Microcontrollers DC-DC Converters Protection Circuits Battery Chargers Others Communication Protocols: RS232, RS485, I2C, SPI Wireless Technologies: XBee, ESP32 ODB2 / J1939 Linux Hardware: Raspberry Pi, GL-iNet, Hi-Link Linux OS: OpenWrt, Ubuntu Languages: Portuguese, English, French Expertise: Electronics PCB Troubleshooting

Rapid system prototyping with off the shelf prototyping boards can be accomplished in a short period of time. Having a diverse background in embedded development and IoT, I can provide services based on years of experience with embedded systems in harsh user environments (bus transportation industry, cell phones, hobby grade R/C vehicles, sensors, and medical devices). I am familiar and have used prototyping and breakout boards from many companies including Arduino, Adafruit, Raytac, Microchip, Sparkfun, Nordic nRF52 product line, Digi XBEE3 Cellular, Bosch (IMU), and others. When necessary, custom prototyping PCBs are created with PCB CAD tools. More than three years as lead engineer implementing both hardware and firmware of cellular NB/IoT systems using Digi XBEE3 technology resulted in launch of more than 100 systems now active in the bus transportation industry. Technologies in the product use solar charging, lithium iron batteries, low power implementation, MicroPython programming, watch dog timing, Bluetooth LE control, smart battery management, cellular NB/IoT, and much more. I have excellent knowledge and experience in Software Development Life Cycle (SDLC) and Agile Methodologies. I am flexible to project demands and shifting technologies and requirements. Having a diverse background in embedded development, I can provide services based on years of experience with embedded systems in harsh user environments (cell phones, hobby grade R/C vehicles, sensors, and medical devices). Embedded technologies include concurrent use of pulse width modulation (PWM), analog to digital converters (ADC), digital to analog converters (DAC), Bluetooth LE (BLE), collection algorithms, control algorithms, motion sensing, temperature sensors, light sensors, and much more. I have a BS degree in Engineering with over 25 hours of graduate courses in CS at Johns Hopkins University. I have both designed and managed development of numerous embedded systems including voice (audio) systems for the US Air Force, Motorola Pagers, NEC cell phones, Samsung GSM/GPRS smart phones, and hobby grade (very advanced) radio control vehicles at Traxxas. At Traxxas, receiving seven accepted patents, I provided hands on development and team management for all of the embedded hardware/firmware radio control technologies including spread spectrum radio control links, sensors (GPS, accelerometer, temperature, RPM, etc.), BLE link to iOS/Android phones with several awarded patents and additional patent applications still in process. Rapid development of a medical blue light sensor for an Upwork client connected to an Android App I also developed was completed in 4 weeks with a working prototype demonstratable to investors and end users. Development of a wearable 9DOF high precision motion sensor for an UpWork client illustrates my capabilities for embedded system development, PCB design, and embedded C programming. Thank you and I look forward to working with your company in the very near future. Best regards, Gary DeWitt

Professional PCB Designer | Embedded Systems Engineer | Hardware Developer Are you looking for a skilled PCB and electronics engineer to bring your product idea from concept to a production-ready design? You’re in the right place! With 5+ years of experience in PCB design, circuit development, and embedded systems engineering, I specialize in creating high-performance, cost-effective, and manufacturable PCB layouts tailored to your exact requirements. I have successfully worked with startups, inventors, and companies worldwide, helping them design and develop custom PCBs, IoT devices, and embedded hardware solutions from prototype to mass production. Tools I Use: Altium Designer | KiCAD | EasyEDA | Proteus | Eagle | OrCAD | DipTrace

We are a dedicated IoT and Embedded Systems engineering company providing end-to-end product development services. From a simple idea to a fully functional product, we handle every stage with precision and expertise. What We Do We specialize in complete embedded and IoT solutions, including: ✔ Hardware Design & PCB Engineering Custom hardware design PCB schematic & layout 3D CAD enclosure design Prototype assembly & testing More than 50+ PCB designs delivered 20+ prototypes successfully developed ✔ Firmware & Embedded Software Development ESP32 (all variants), ESP8266, Arduino, STM32 Arduino IDE, ESP-IDF, PlatformIO Driver development, peripheral integration, optimization RTOS-based firmware IoT protocol implementation (MQTT, HTTP, WebSocket, BLE, LoRa, etc.) ✔ Embedded Linux Solutions Raspberry Pi (all models) NXP i.MX series Custom Yocto builds Driver development & hardware abstraction System optimization & integration ✔ IoT Cloud Integration Secure device-to-cloud communication REST API integration MQTT/SSL/TLS setup Custom dashboard & backend integration Over-the-air (OTA) firmware update solutions ✔ Prototyping & Product Development Concept → Prototype → MVP → Production Enclosure design, 3D modeling, and mechanical planning In-house PCB assembly for small-run builds ✔ Domains We Have Worked In Data acquisition systems Home automation Smart home assistant systems Personnel tracking & monitoring Industrial IoT Custom low-power wireless systems ✔ Our Own Product Line We have developed a complete NTP-based clock with P10 LED display, including hardware, firmware, and cloud integration — showcasing our capability to deliver commercial-grade products. Why Clients Choose Us Strong experience with corporate clients End-to-end solution provider (hardware + firmware + cloud + mechanical) Fast turnaround and clear communication Scalable designs suitable for production Reliable long-term technical support

𝐏𝐫𝐨𝐝𝐮𝐜𝐭𝐢𝐨𝐧 𝐟𝐢𝐫𝐦𝐰𝐚𝐫𝐞 𝐩𝐨𝐰𝐞𝐫𝐢𝐧𝐠 𝐭𝐡𝐞 𝐄𝐕, 𝐁𝐌𝐖 𝐢𝟕 𝐬𝐞𝐚𝐭 𝐜𝐨𝐧𝐭𝐫𝐨𝐥 𝐮𝐧𝐢𝐭𝐬, 𝐚𝐧𝐝 𝐋𝐓𝐄 𝐚𝐬𝐬𝐞𝐭 𝐭𝐫𝐚𝐜𝐤𝐞𝐫𝐬 𝐝𝐞𝐩𝐥𝐨𝐲𝐞𝐝 𝐢𝐧 𝐭𝐡𝐞 𝐟𝐢𝐞𝐥𝐝. ⭐ Top Rated ⭐ 100% Job Success ⭐ 7 Contracts ⭐ 6 Years Experience Across 5 Companies in 4 Countries I build production-grade embedded systems from bare-metal bring-up to cloud-connected IoT infrastructure — with deep expertise in automotive, battery management systems, wireless connectivity, and safety-critical firmware. 🟧𝐁𝐚𝐭𝐭𝐞𝐫𝐲 𝐌𝐚𝐧𝐚𝐠𝐞𝐦𝐞𝐧𝐭 & 𝐀𝐮𝐭𝐨𝐦𝐨𝐭𝐢𝐯𝐞 — 𝐒𝐓𝐌𝟑𝟐𝐋𝟒𝟗𝟔 | 𝐂𝐀𝐍𝐨𝐩𝐞𝐧 | 𝐔𝐃𝐒 | 𝐈𝐒𝐎 𝟐𝟔𝟐𝟔𝟐   • Developed complete BQ79616 AFE driver from scratch using register-level SPI communication   • Implemented: Cell balancing, SOC / SOH / SOP estimation, EEPROM & NVM logging   • Built scalable CANopen CiA 4.0 Object Dictionary supporting 4 hardware variants with zero code duplication   • Developed UDS bootloader (ISO 14229) under certified µC/OS-II RTOS   • Worked within ISO 26262 process using: Tessy unit testing, Axivion static analysis, PCAN Explorer 🟧𝐁𝐌𝐖 𝐢𝟕 & 𝐁𝐌𝐖 𝐗𝟓 𝐒𝐞𝐚𝐭 𝐂𝐨𝐧𝐭𝐫𝐨𝐥 𝐔𝐧𝐢𝐭𝐬 — 𝐍𝐗𝐏 𝐒𝟑𝟐𝐊𝟏𝟒𝟔 | 𝐀𝐔𝐓𝐎𝐒𝐀𝐑 | 𝐀𝐒𝐈𝐋-𝐁   • Developed AUTOSAR SWC/RTE/MCAL components in C/C++   • Worked on safety-critical seat control systems for BMW platforms   • Integrated with: DaVinci Configurator, CANoe network validation   • Authored: Software Design Documents (SDD), Interface specifications   • Maintained ISO 26262 ASIL-B compliance throughout development lifecycle 🟧𝐈𝐨𝐓, 𝐋𝐓𝐄 & 𝐓𝐞𝐥𝐞𝐦𝐚𝐭𝐢𝐜𝐬 — 𝐏𝐫𝐨𝐝𝐮𝐜𝐭𝐢𝐨𝐧 𝐋𝐓𝐄 𝐀𝐬𝐬𝐞𝐭 𝐓𝐫𝐚𝐜𝐤𝐞𝐫 — 𝐒𝐓𝐌𝟑𝟐𝐅𝟒𝟏𝟐 | 𝐌𝐐𝐓𝐓/𝐓𝐋𝐒 | 𝐀𝐖𝐒 𝐈𝐨𝐓 𝐂𝐨𝐫𝐞   • Built full telemetry pipeline: nanopb → LZ4 → Base64 → MQTT/TLS → AWS IoT Core   • Diagnosed and resolved: LZ4 FLG byte corruption   • Protobuf partial-encode production faults   • Integrated: LTE (EG800K), GNSS (MAX-F10S), BLE, IMU sensors   • Designed low-power 6-state FreeRTOS firmware architecture   • Validated 53 production telemetry batches 🟧𝐓𝐞𝐥𝐞𝐦𝐚𝐭𝐢𝐜𝐬 & 𝐄𝐕 𝐂𝐡𝐚𝐫𝐠𝐞𝐫 — 𝐍𝐗𝐏 𝐒𝟑𝟐𝐊𝟏𝟒𝟒 | 𝐒𝟑𝟐𝐊𝟏𝟒𝟔   Worked on: Connected Logger telematics platform, Wallbox EV charger firmware   Protocols & interfaces: CAN / LIN / ModBus-RTU, Wi-Fi / GSM / GPS / BLE / RFID   Testing tools: PCAN-View, Embedded diagnostics & protocol validation 🟧𝐈𝐨𝐓 𝐂𝐨𝐧𝐧𝐞𝐜𝐭𝐢𝐯𝐢𝐭𝐲 𝐅𝐢𝐫𝐦𝐰𝐚𝐫𝐞 — 𝐀𝐧𝐢𝐦𝐚𝐥 𝐂𝐨𝐥𝐥𝐚𝐫 — 𝐒𝐀𝐌𝐃𝟐𝟏 | 𝐧𝐑𝐅𝟓𝟑𝟒𝟎 | 𝐀𝐖𝐒 𝐈𝐨𝐓   • Implemented secure MQTTS connectivity using Telit ME310G1 LTE module   • Solved Telit SSL certificate storage issue using: AT#SSLSECCA   • Eliminated NVM dependency problem around: AT#SSLSECDATA, AT#SSLEN 🟧𝐁𝐋𝐄, 𝐖𝐞𝐚𝐫𝐚𝐛𝐥𝐞𝐬 & 𝐌𝐞𝐝𝐢𝐜𝐚𝐥 𝐃𝐞𝐯𝐢𝐜𝐞𝐬 — 𝐌𝐞𝐝𝐢𝐜𝐚𝐥 𝐇𝐚𝐩𝐭𝐢𝐜 𝐖𝐞𝐚𝐫𝐚𝐛𝐥𝐞 — 𝐖𝐇𝐀𝐏𝐓𝐈𝐂 𝐕𝐞𝐬𝐭 𝐧𝐑𝐅𝟓𝟐𝟖𝟒𝟎 | 𝐙𝐞𝐩𝐡𝐲𝐫 𝐑𝐓𝐎𝐒   • Developed firmware for 12-channel haptic feedback wearable   • Integrated: DA7281 haptic drivers, BQ25190 PMIC, MAX17260 fuel gauge, TPS65987 USB-PD, ADS1220 ADC, INA231, BNO085 / ICM-20948 IMUs   • Designed BLE RPC communication protocol   • Led migration from bare-metal to Zephyr RTOS   • Worked with IEC 62304 medical software process awareness 🔐 𝐒𝐞𝐜𝐮𝐫𝐢𝐭𝐲 & 𝐂𝐨𝐦𝐩𝐥𝐢𝐚𝐧𝐜𝐞   • Firmware for OPOLO COSMOS crypto wallet   • SHA / BLAKE / BECH32 on ARM Cortex   • Binance, Secret & Helium chain support   • Developed JavaCard applet on NXP SecureBox JCOP   • Safety-critical firmware compliant with: UL 60730, UL 1998   • Additional projects: dsPIC33 LIN communications, Embedded touch display drivers ⚙ 𝐓𝐞𝐜𝐡𝐧𝐢𝐜𝐚𝐥 𝐒𝐭𝐚𝐜𝐤 𝐌𝐂𝐔𝐬: STM32 F4/G4/L4 • nRF52832/52840/5340 • NXP S32K144/146 • SAMD21 • dsPIC33 • ESP32 𝐅𝐫𝐞𝐞𝐑𝐓𝐎𝐒: Zephyr • µC/OS-II • AUTOSAR OS • Bare-metal HAL 𝐀𝐮𝐭𝐨𝐦𝐨𝐭𝐢𝐯𝐞: AUTOSAR SWC/RTE • CANopen CiA 4.0 • UDS ISO 14229 • CAN/CAN-FD • LIN 𝐂𝐨𝐧𝐧𝐞𝐜𝐭𝐢𝐯𝐢𝐭𝐲: BLE GATT/HID/RPC • LTE • GNSS • GSM • Wi-Fi • MQTT/TLS 𝐂𝐥𝐨𝐮𝐝: AWS IoT Core • nanopb • LZ4 • Base64 𝐒𝐭𝐚𝐧𝐝𝐚𝐫𝐝𝐬: ISO 26262 ASIL-A/B • UL 60730 • UL 1998 • IEC 62304 • MISRA-C 𝐓𝐨𝐨𝐥𝐬: STM32CubeIDE • CANoe • Tessy • Axivion • J-Link • DaVinci Configurator • PCAN Explorer 🚀 𝐖𝐡𝐚𝐭 𝐈 𝐂𝐚𝐧 𝐇𝐞𝐥𝐩 𝐘𝐨𝐮 𝐖𝐢𝐭𝐡 ✔ Automotive Firmware ✔ Battery Management Systems (BMS) ✔ AUTOSAR Development ✔ Embedded Linux & RTOS ✔ BLE / LTE / GNSS Connectivity ✔ AWS IoT Integration ✔ Low-Power Embedded Systems ✔ Production Firmware Bring-up ✔ Safety-Critical Firmware ✔ CAN / LIN / UDS Diagnostics 📩 𝐋𝐞𝐭’𝐬 𝐁𝐮𝐢𝐥𝐝 𝐏𝐫𝐨𝐝𝐮𝐜𝐭𝐢𝐨𝐧-𝐆𝐫𝐚𝐝𝐞 𝐅𝐢𝐫𝐦𝐰𝐚𝐫𝐞 If you're working on a serious embedded product — automotive, IoT, medical, industrial, or battery-powered — send me your project brief. I specialize in firmware that ships to production and survives real-world deployment.

Specialized in designing and developing high-performance embedded solutions, FPGA-based systems, and IoT applications for industries such as automotive, industrial automation, consumer electronics, and building management systems. With expertise in low-level firmware, high-speed PCB design, and real-time operating systems (RTOS), I ensure robust, efficient, and scalable designs tailored to your project needs. 💡 My Key Expertise: ✅ Embedded Systems Development (RTOS, Embedded Linux) ✅ FPGA & ASIC Chip Design (Xilinx Vivado, Intel Quartus, Verilog/SystemVerilog) ✅ IoT Solutions (Bluetooth/BLE, Smart Devices, Industrial IoT) ✅ Firmware Development (C, Python, Assembly, MATLAB) ✅ DSP (Digital Signal Processing) & Image/Object Detection Algorithms ✅ Microcontroller Programming (STM32, TIVA, nRF5340, Raspberry Pi, Arduino) ✅ PCB Design & Hardware Prototyping (Multilayer, High-Speed, Analog & Digital) ✅ Automotive & Industrial Automation Systems 💡 Why Choose Me? 🔹 3+ years of experience in high-reliability embedded solutions and FPGA Solutions 🔹 Deep expertise in FPGA-based systems, IoT, and DSP applications 🔹 Proven track record of delivering optimized and scalable designs 🔹 Strong understanding of real-time constraints and system integration Let’s bring your project to life! 🚀 Send me a message, and let’s have a quick chat. 🔗 Let’s Build the Future, One Embedded System at a Time!

I am a mechatronics engineer experienced in electronic circuits and embedded systems/ microcontrollers programming - I have experienced in electronic and PCB circuit design ( high speed, power electronics, mixed-signal, multilayer). - I have experience working in embedded systems programming ( Arduino, ESP..). - Experienced in mechanical and electrical simulation using Matlab, LTspice, and Proteus.

Experienced Engineer with 7+ years in embedded application development using C++, C, LabVIEW, and LabVIEW FPGAs. Specializations include: * Training and tutoring in LabVIEW, C/C++, and electronics * LabVIEW code review * Language conversion (Python, Matlab, LabVIEW to C/C++/C# and vice versa) * Installer provision for C/C++/LabVIEW applications * Complete documentation with version control system * Arduino-based development * Analog & digital electronic circuit design * Multi-layer PCB design * Hardware design and PCB review Get professional support, and reliable deliverables for your project. Let's collaborate and achieve your goals.

I am a highly detail-oriented Embedded Systems Engineer with extensive experience across multiple embedded industries, including IoT devices, robotics, safety systems, and smart electrical meters. I specialize in designing reliable, low-power embedded solutions with strong emphasis on modular architecture, portability, and security. I have strong expertise in wireless IoT firmware, custom bootloaders, OTA/FUOTA systems, compression algorithms, and RTOS-based architectures. I have developed production-grade firmware from scratch, including bootloaders capable of updating both application and bootloader images, delta OTA update systems, and ultra-low-power connected devices. Recently, I have been working with Silicon Labs platforms, Amazon Sidewalk protocol, and Zephyr RTOS-based systems. --------------------------------------------------------------------------------------------------------------- 🔹 Core Expertise • Embedded Firmware Architecture • Bootloader Development • Delta OTA / FUOTA Systems • Ultra-Low Power IoT Devices • Wireless Connectivity (BLE / LoRa / Sidewalk) • RTOS Design & Porting • Compression Algorithms for Firmware Updates --------------------------------------------------------------------------------------------------------------- 💎 Programming Languages • C / C++ • Python • Assembly --------------------------------------------------------------------------------------------------------------- 💎 Microcontrollers • ARM Cortex-M0 / M3 / M4 / M33 (single & dual core) • Nordic Semiconductor • Texas Instruments • Analog Devices • STMicroelectronics • Silicon Labs (EFR32 / Amazon Sidewalk) • Espressif • Maxim Integrated --------------------------------------------------------------------------------------------------------------- 💎 Operating Systems • FreeRTOS • TI-RTOS • POSIX • Zephyr RTOS (in progress) • Custom scheduler development • RTOS porting to ARM Cortex-M architectures --------------------------------------------------------------------------------------------------------------- 💎 Wireless Communication • Wi-Fi • Bluetooth / BLE • LoRa / LoRaWAN • Sub-GHz RF • Amazon Sidewalk • Proprietary RF stacks --------------------------------------------------------------------------------------------------------------- 💎 Wired Communication • UART / USART • SPI • I2C • SDI-12 --------------------------------------------------------------------------------------------------------------- 💎 Protocols & Standards • LoRaWAN • BLE • DLMS / COSEM • Amazon Sidewalk --------------------------------------------------------------------------------------------------------------- 💎 OTA & Bootloader Expertise • Custom bootloader development from scratch • Application & bootloader self-update support • Delta OTA update algorithms • Secure firmware update architecture • FUOTA implementation --------------------------------------------------------------------------------------------------------------- 💎 Compression & Firmware Optimization • LZ77 compression • Deflate algorithm • Huffman coding • Custom compression/decompression design • Delta firmware generation algorithms • Memory-constrained decompression --------------------------------------------------------------------------------------------------------------- 💎 IoT Cloud Connectivity (Device Side) • AWS IoT Core (device onboarding, uplink/downlink) • The Things Network (TTN) • Senet • MultiTech • FUOTA integration --------------------------------------------------------------------------------------------------------------- 💎 Build Systems & Toolchains • GCC • Make • CMake --------------------------------------------------------------------------------------------------------------- 💎 Debugging & Testing Tools • Oscilloscope • Spectrum Analyzer • Logic Analyzer • Multimeter • Joulescope (power profiling) --------------------------------------------------------------------------------------------------------------- 💎 Version Control • Git • SVN --------------------------------------------------------------------------------------------------------------- 💎 Additional Skills • Low-power optimization • Power profiling and tuning • Embedded firmware architecture design • PID control systems • DSP (Digital Signal Processing) • Bash scripting • Embedded Linux • PCB design understanding

Experienced Embedded Firmware & IoT Developer (9+ Years) I support companies design and deliver robust embedded products - from prototype to production - with stable firmware, scalable IoT connectivity, and manufacturable solutions. My focus is on solving real engineering challenges: low-power optimization, hardware-software integration, secure OTA updates, and reliable connectivity (BLE, Wi-Fi, CAN, Modbus, USB). I work with both small startups and established teams to build devices that satisfy technical and production requirements. Experiences about: - Embedded firmware, software development: C/C++ - Embedded GUI, HMI: LVGL, TouchGFX, GUIx, Custom UI. - Embedded Webapp: Bootstrap, JavaScript, HTML, Compression, Secure. - Application: Windows, Linux (Python, C#), high optimization to work with device firmware. - Mobile application: Android, iOS(.NET MAUI), launch to AppStore and Play Store. - Iot Cloud: AWS Iot, Azure Iot, Thingboard Cloud. - Communication network: BLE, WIFI, Ethernet, CAN, NFC, MODBUS, USB(WINUSB, WINCID, LIBUSB), Z-WAVE. - RTOS: freeRTOS, Zephyr, Threadx(Azure RTOS). - MCU/SOC: STM32, EFR32BG, EFM32, ZGM23, SiWx917, NRF52, NRF53, NRF54, ESP32, PIC, AVR, ATSAM, Ambiq Appolo. - Framework, SDK: STM32Cube, nRF52 SDK, nRF Connect SDK, ESP-IDF, Simplicity SDK(Silabs). - Device firmware update(DFU): Bootloader, Secure Boot, Flash encryption, OTA. STM32 embedded GUI & TouchGFX Specialize: - 60 Hz smooth rendering: Flicker-free displays with partial update optimization to minimize MCU load and power draw - Memory-efficient design: RAM and FLASH optimization, external memory loader drivers, and asset compression strategies for constrained targets - Custom widgets & containers: Reusable, complex UI components built for maintainability and fast iteration - Dynamic layout & multilingual UI: Flexible screen layouts that adapt like mobile apps, plus runtime language and font loading (no firmware recompile needed) - Touch & physical button input: Capacitive/resistive touch handling and GPIO-driven navigation - Hardware-independent development: Full simulator workflow with mock/stub data so UI progress never blocks on hardware availability Let’s chat about your project. I can quickly analyze requirements and propose a plan.