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I’m an Embedded Systems & IoT Engineer with 4+ years of experience in electronics design, PCB design and development, and microcontroller programming. I help clients transform ideas into reliable, production-ready hardware solutions — from concept to working prototype. 🔧 What I Offer 🔹 PCB Design & Prototyping (KiCad, Altium, EasyEDA – optimized for JLCPCB/PCBWay) 🔹 Microcontroller Programming (ESP32, Arduino, STM32, Atmega) 🔹 SBC & Linux Systems Integration (Raspberry Pi, Radxa) 🔹 Firmware Development (C/C++, ESP-IDF, Arduino IDE, Linux setup, Python) 🔹 IoT & Wireless Systems (Wi-Fi, Bluetooth, BLE, LoRa) 🔹 Sensor Integration & Control Systems (motion, audio, automation, robotics) 🔹 Analog & Digital Circuit Design (simulation & testing with Proteus, LTSpice, Multisim) 💡 Why Clients Choose Me ✅ Top Rated Seller on Upwork ✅ Combine Hardware + Firmware expertise — no need for multiple freelancers ✅ Reliable, Scalable, and Production-ready designs ✅ Full deliverables: Code, PCB files, BOM, Documentation ✅ Clear communication and fast turnaround 🏆 Proven Work • Motion Tracking Device: Built with ESP32-C3 + motion sensor, real-time speed calculations, Wi-Fi data streaming. • Industrial Systems: OBD2 interfaces & control logic development • SBC Projects: Raspberry Pi & Radxa hardware/software integration (Custom PCBs and Firmware design) • IoT Home Automation System: ESP32/Arduino-based system with wireless sensor integration for smart control. • Robotic Arm Controller: Arduino-powered automation with custom PCB for motor drivers and sensors. Whether you need a custom IoT device, compact PCB layout, or a complete embedded prototype, I deliver results that are reliable, scalable, and optimized for your needs.

I'm an experienced PCB Designer and Firmware developer with a strong background in Embedded Systems , PCB Design and manufacturing. With over 3 years of expertise, ✅ PCB DESIGN SERVICES: • Expertise in PCB layout/design for up to 8 layers, offering cost-effective and space-saving solutions. • Skill in creating custom schematics, footprints, symbols, and libraries from scratch. • Proficiency in board design, including the creation of 3D models of PCBs in CAD and PDF formats. • Experienced in firmware development and programming. • Preparation of Gerber files for production, with a focus on selecting components, creating a bill of materials (BOM), and preparing comprehensive manufacturing documentation. ✅ FIRMWARE DEVELOPMENT: • I develop custom firmware for various platforms such as FPGA, MCU, SoCs, ARM, NXP, PIC, Arduino, and Atmel. • I specialize in programming for Bluetooth Low Energy (BLE) and other wireless technologies. ✅ PRODUCT DEVELOPMENT: • I use SolidWorks for mechanical design, including 3D modeling and mold designs. • I also design product enclosures. ✅ SPECIALIZATIONS: FOR ELECTRIC VEHICLES: • I design Battery Management Systems . ✅ FOR INDUSTRIAL/REMOTE CONTROL APPLICATIONS: • I create microcontroller-based designs for robotics, automation, power systems, VFDs, and instrumentation. • I have expertise in communication technologies like WiFi, TX/RX, Bluetooth, BLE, GATT, and radio. ✅ SOFTWARE EXPERTISE: • I'm proficient in software like Altium Designer, Eagle PCB, KiCad, Proteus Design, and more. • I'm skilled in using SolidWorks and AutoCAD for mechanical designs. I understand and can design products to comply with UL Standards, ensuring safety and reliability. My commitment is to provide high-quality, custom PCB designs that meet the specific needs of each client, using the latest software and adhering to the highest industry standards

I help medical and IoT product teams design the right hardware architecture early, so they avoid costly PCB re-spins, noise issues, and late-stage failures. If you’re building a sensor-heavy, STM32-based, or medical-adjacent product, I act as your hardware systems architect—focusing on design decisions, trade-offs, and long-term reliability, not just execution. How I typically help: • System architecture & feasibility studies • Component and topology selection (MCU, sensors, AFE, power) • Schematic-level hardware design & review • Pre-fabrication PCB audits to reduce redesign risk My work is decision-driven and outcome-focused. I start by understanding what you are building and why, then provide clear, documented recommendations you can confidently execute or manufacture. I’ve worked on medical electronics, bio signal front ends (ECG/EMG), wearables, and IoT devices, where design mistakes are expensive and timelines matter. If you’re looking for clarity, strong architecture, and fewer hardware surprises, I’d be glad to help. ✅ Core Expertise 🔹 Hardware Product Development - Architecture Design, Schematic & Layout (up to 12-layer PCBs) - Rigid, Rigid-Flex & Flex PCB Design - Signal & Power Integrity, EMI/EMC mitigation - DFM/DFT, FMEA, Risk Analysis, Certification Prep - BOM optimization, part lifecycle, obsolescence management 🔹 Sensor-Integrated Wearables & IoT - Real-time biometric sensing (ECG, EMG, HR, SpO2, Temp, IMU) - Wireless: BLE, Wi-Fi, LoRa, 4G, CAN, RS485 - Medical-grade signal acquisition & conditioning - Battery management, power efficiency & charging circuits 🔹 Prototyping & Compliance - Pre-compliance testing: EMI/EMC, Thermal, Vibration - Regulatory: Medical safety (IEC standards), ISO/NABL - Detailed documentation: test plans, architecture diagrams, handover packages 🔹 Tools & Platforms - ECAD: Altium Designer, OrCAD, CAM350, KiCAD - Firmware Platforms: STM32, Nordic nRF52, ESP32/8266, Microchip, Raspberry Pi - Protocols: I2C, UART, SPI, RS232/RS485, LVDS, RF, NFC ✅ Deliverables - Design Concept Block Diagrams - Process Flow Block Diagrams - Schematic PDF - Design Files (Schematic & Layout) - Fabrication Files - Assembly Files - Bill of Materials - 3D Models - Components Library - Test Documents (If req.) 🏆 Notable Projects & Solutions Built - Smart Drug Delivery Device: Precision-controlled insulin injector - Bone Density Meter: Early-diagnosis medical scanner - Julia Robot: Cooking automation system with embedded sensors - EMG Wearable: Portable diagnostic device for muscle activity monitoring - SOWBIT: Veterinary health monitor (ECG, SpO2, Temp) for livestock - Smart Ring: Measures multiple vitals via fingertip contact - Elite Alerte: Maritime emergency alert & sensing system - CloudSwitch: IoT-enabled wireless AC meter for remote energy tracking - Fuel Level Sensor (Ultrasonic + GSM): Real-time monitoring for containers - PoE Switch & Weighing Scale: Industrial-grade, high-precision electronics 🌍 Why Clients Choose Me ✅ Medical-grade design focus with regulatory foresight ✅ Deep cross-industry experience from wearables to industrial controls ✅ Excellent communication, proactive updates, and engineering documentation ✅ Efficient collaboration with global clients and vendors ✅ Quality-first mindset with long-term reliability and support

I have designed 30+ real-world components used in defence systems, DC fans, and kitchen appliances handling everything from design and simulation to fabrication and testing myself, so you get complete, working hardware solutions from one expert. I am an RF, PCB, and Embedded Systems Engineer with strong hands-on experience in building complete hardware products. I have worked on real-world RF systems including high-power amplifiers, transmitter-receiver designs, RF filters, and antenna systems for communication and defence-related applications. I specialize in RF design, antenna design and testing, wireless communication, and high-quality PCB design including multilayer boards using Altium Designer and KiCad. I also work on circuit design, analog electronics, RF filters and amplifiers, and embedded systems using STM32, ESP32, and Arduino. I have successfully delivered reliable, tested, and production-ready designs that perform well in real-world conditions. For large and challenging projects, I collaborate with a trusted team of highly skilled professionals, so we can deliver a complete, fully working product including hardware, software, and mechanical design all in one place. ✅ RF & Microwave Circuit Design ✅ RF System Design (Transmitter & Receiver) ✅ RF Front-End Design ✅ RF Power Amplifier Design (Low, Medium & High Power) ✅ LNA (Low Noise Amplifier) Design ✅ RF Filters Design (Bandpass, Low-pass, High-pass) ✅ Impedance Matching & RF Tuning ✅ Antenna Design (Patch, Monopole, Dipole, Custom) ✅ Antenna Simulation & Optimization ✅ Antenna Testing & Performance Measurement ✅ Wireless Communication System Design ✅ RF Signal Chain Development ✅ Frequency Planning & Spectrum Analysis ✅ PCB Design (Single Layer, Double Layer, Multilayer) ✅ High-Speed PCB Design ✅ RF PCB Layout & Controlled Impedance Design ✅ Schematic Design & Circuit Layout ✅ PCB Design using Altium Designer, KiCad & EasyEDA ✅ Gerber File Generation & Manufacturing Support ✅ Design for Manufacturing (DFM) & Assembly (DFA) ✅ PCB Debugging & Optimization ✅ Electronic Circuit Design ✅ Analog Circuit Design ✅ Amplifiers & Signal Conditioning Circuits ✅ Sensor Interface Circuit Design ✅ Power Electronics Circuit Design ✅ Hardware Troubleshooting & Debugging ✅ Embedded Systems Design ✅ Embedded Hardware Development ✅ Microcontroller-Based System Design ✅ Microcontroller Programming (STM32, ESP32, Arduino, AVR) ✅ Embedded C & C++ Development ✅ Firmware Development ✅ IoT Device Development (WiFi, LoRa, ESP32) ✅ Raspberry Pi-Based Projects ✅ FPGA Design & Development ✅ Verilog / VHDL Based Design ✅ Digital System Design on FPGA ✅ Simulation & Timing Analysis ✅ FPGA Prototyping & Testing ✅ Electromagnetic Simulation (HFSS, CST, ADS) ✅ Circuit Simulation (LTspice, PSPICE, MATLAB) ✅ EM & RF Co-Simulation ✅ Signal Integrity & EMI/EMC Analysis ✅ Hardware Prototyping ✅ Product Development from Concept to Prototype ✅ Functional Testing & Validation ✅ Performance Measurement & Optimization ✅ Test Results Analysis & Reporting ✅ Technical Writing (Engineering Reports & Documentation) ✅ Research Paper Writing (IEEE Format) ✅ Project Documentation & Reports ✅ RF & Electronics Content Writing ✅ Complete Product Design (Hardware + Embedded + RF + FPGA) ✅ Prototype to Production Support ✅ Real-World Testing & Field Validation ✅ Engineering Simulation & Optimization

Welcome to my profile! I am a Mechatronics Engineer with a solid background in PCB Design, electronics design, Arduino/ESP32 development, and 3D mechanical modeling. As a PCB Designer and CAD Designer, I specialize in creating fully functional prototypes by seamlessly integrating electronic systems with mechanical structures, delivering practical and innovative solutions for real-world applications. Why Choose Me? Integrated Mechatronics Expertise: I combine electronics, embedded programming, and mechanical design to deliver complete end-to-end prototypes. Versatile Microcontroller Knowledge: I work confidently with Arduino, ESP32, Raspberry Pi, and other embedded platforms for a wide variety of applications. Professional CAD & PCB Design: Proficient in Kicad, EasyEDA, SolidWorks, AutoCAD, and Fusion 360 for high-quality PCB and mechanical modeling. Prototype-Ready Solutions: I design, simulate, and troubleshoot both electronics and mechanical components for seamless hardware integration. Industry Experience: From automotive and static equipment to architectural designs, I have experience across multiple engineering sectors. Client-Focused Approach: I aim to understand your goals and bring your ideas to life with a practical and results-driven mindset. My Services: PCB and Circuit Design (EasyEDA, KiCAD) Arduino/ESP32/Raspberry Pi Programming Electronics Prototyping & Troubleshooting 3D Modeling and Mechanical Design (SolidWorks, Fusion 360, AutoCAD) Concept-to-Prototype Development Integration of Sensors, Actuators, and Control Systems IoT Hardware Design and Consultation I am highly enthusiastic about delivering robust, real-world solutions through my multidisciplinary background in electronics and mechanics. Whether you're developing a product from scratch or optimizing an existing design, I’d be excited to collaborate and contribute to your success. Let’s work together to bring your Electronics engineering ideas to life!

Luka Knežević – Hardware Engineer & PCB Designer I am a highly experienced Hardware Developer and PCB Designer with over 5 years of professional engineering experience and more than 50 successfully completed projects ranging from low-power embedded systems to multi-kilowatt power electronics. My background spans high-performance LED drivers, motor control, energy systems, wearable devices, medical devices, NFC solutions, industrial controllers, and advanced multi-layer PCB design. I have deep experience in designing reliable, production-ready hardware using modern MCUs (ESP32, STM32, PIC, TI, C2000, Spartan 7 (AMD)), high-power topologies, battery systems, and a wide range of communication protocols. My lab is fully equipped for prototyping, testing, and validation, including oscilloscope work, precision measurements, firmware bring-up, and full board bring-up. ________________________________________ Professional Background • 5+ years of hardware engineering experience • 50+ completed projects, including: o Buck, boost, flyback, and PFC buck converters o BMS systems (1–16 cells) o E-bike inverter, motor control boards, motor drivers o E-bike chargers and high-efficiency power supplies o Nanosatellite power supply modules o Wearable devices (ultra low power + haptics + sensors) o Medical devices (Class A/B prototyping) o Industrial control cards (TI, ESP32, STM32, C2000, Spartan 7 (AMD)) o Wireless systems (BLE, Wi-Fi, LoRa, NFC) o Toys and consumer electronics o Rigid and rigid flex PCBs (2–16 layers) o Screen sterilization system controllers I have designed boards ranging from 1 to 16 layers, including rigid flex adapters, ultra compact wearable PCBs, motor control boards, high voltage/current power stages (up to 3 kW), and RF capable layouts. ________________________________________ Technical Expertise Hardware & Power Electronics • Topology selection: buck, boost, flyback, SEPIC, PFC buck, forward, synchronous drivers • Wide range power design up to 3 kW, switching frequencies up to 200 kHz • Battery systems: BMS, balancing, charging, MOSFET drivers • Motor control drivers (BLDC, brushed DC, E bike) PCB Design • Professional PCB layout using: o Altium Designer (primary) o KiCad, OrCAD, PCAD, EasyEDA • High density, mixed signal, high current, HV, and EMC safe design • Rigid flex, flex adapters, microcontroller modules, RF layouts • Full DFM/DFT optimization for production Communication Protocols • CAN, I²C, SPI, UART, RS485 • Bluetooth, Wi Fi, BLE Mesh, ESP NOW, LoRa • Ethernet LWIP, NFC, custom short-range communication Software & Simulation • MATLAB, Simulink, PSpice • LTspice, TINA, Altium simulations • Firmware bring up (ESP-IDF, STM32 HAL, Arduino) Prototyping & Testing • Soldering, rework, fault analysis • Gate driver tuning, feedback loop stabilization • Load testing, thermal evaluation, EMC preparation ________________________________________ Achievements • 1st Place – IFEC 2019 (E-bike drive) • 2nd Place – IFEC 2020 (Nanosatellite power supply) — Team Leader & Hardware Lead • Former CTO of a hardware startup (2 years) • Project Manager for solar power plant automation (1 year) • Over 50 projects and 1300+ billable hours on Upwork ________________________________________ Notable Project Types • Screen sterilization controllers (UV / chemical) • Wearable devices (IMU + LRA haptics + battery optimization) • Medical device prototyping • Power supplies (industrial, consumer, nanosatellite grade) • Custom rigid flex boards & adapters • NFC-triggered activation devices • Motor control & drive boards ________________________________________ Let’s Work Together Best regards, Luka Knežević