Abdullah S.

Embedded Systems & PCB Design Engineer ESP32 | STM32 | Nordic nRF | LoRaWAN | Custom PCB Design | Cloud-Connected Devices I design embedded systems that ship not just prototypes that demo well. From custom BLE wearables and ESP32 LoRa sensor networks to industrial STM32 control boards with safety-rated relay logic, I take products the full distance: hardware selection, custom PCB design, production-grade firmware, robust communication stacks, and cloud integration. My work is built on clean, scalable architecture, deterministic system behavior, and efficient resource use. The result is hardware and firmware that stay stable, reliable, and maintainable after deployment, engineered to survive the field, not just the bench. Core Technical Expertise Embedded Firmware Development Microcontrollers: ESP32, ESP8266, STM32, Nordic nRF52 Series, ATmega/AVR Frameworks: Bare-metal and framework-based (ESP-IDF, STM32Cube, Arduino) Optimization: Efficient C/C++ with careful memory management and deterministic timing Peripherals: GPIO, PWM, ADC, UART, SPI, I2C, I2S, DMA Sensor Interfacing: Precision acquisition from industrial and consumer-grade sensors PCB Design & Hardware Engineering Schematic & Layout: Custom PCBs for STM32 and ESP32 controllers, LoRa nodes, BLE wearables, and industrial control boards Industrial Hardware: Relay and SSR control, safety architecture, protected inputs, power switching, and fail-safe design Design for Manufacturing: Power regulation, signal integrity, sensor integration, and production-ready output (Gerbers, BOM, CPL) Hardware Debugging: Logic analyzers, oscilloscopes, and JTAG/SWD bring-up IoT Connectivity & Communication LoRa & LoRaWAN: Long-range, low-power networks for agricultural, industrial, and smart-city use Wireless: Wi-Fi and BLE (ESP32/nRF52), including mesh and point-to-point Wired: RS-485/Modbus and CAN Bus for industrial environments Cloud Protocols: MQTT, HTTP/REST, WebSocket, CoAP Integrations: Firebase, AWS IoT, TTN, and custom backend APIs Device Management & Power OTA: Robust over-the-air firmware updates for ESP32 and STM32 Remote Management: Configuration, diagnostics, and fault-tolerant self-healing logic Power Management: Deep-sleep optimization for battery-operated remote nodes Embedded Web: On-device dashboards and captive-portal provisioning Tools & Technologies Languages: C, C++, MicroPython Communication: LoRaWAN, BLE, Wi-Fi, RS-485/Modbus, CAN Bus IDEs & Tools: PlatformIO, VS Code, STM32CubeIDE, ESP-IDF, Arduino IDE, Keil Cloud/IoT: Firebase, Blynk, ThingsBoard, Helium, TTN PCB Design: KiCad, EasyEDA How I Can Help You End-to-End Product Development: From concept to a custom PCB with production-grade firmware Industrial Control & Sensing: Safety-aware control boards, relay and SSR logic, RS-485 systems LoRaWAN & Long-Range Networks: Sensor networks for remote and large-area deployments Firmware Refactoring: Debugging and optimizing existing code for stability and lower power Cloud Integration: Secure, real-time data logging and remote control What You Can Expect Clean, modular, well-documented code that's easy to maintain Reliable behavior under network drops and hardware resets Regular progress updates and clear technical documentation Practical engineering focused on long-term reliability over quick fixes Availability Open to short-term tasks (debugging, sensor integration, driver development), long-term IoT projects (full hardware-to-cloud lifecycle), and consultancy (hardware selection and system architecture). Quick response guaranteed reach out with your concept or requirements.