Anh N.

Embedded Systems & IoT Engineer | Firmware | Hardware | C/C++ Hello! 👋 I'm an Embedded Systems & IoT Engineer specializing in embedded firmware development, hardware design, PCB development, and wireless communication systems. I help clients turn ideas into reliable, efficient, and production-ready embedded products - from initial concept and prototyping to firmware development, hardware integration, debugging, and testing. My expertise covers STM32, ESP32, nRF52, C/C++, LoRa, LoRaWAN, BLE, Wi-Fi, Ethernet, 4G/LTE, and IoT gateway development. With hands-on experience in both hardware and firmware, I can provide complete embedded solutions rather than just individual components. 🔧 Embedded Firmware Development ► Embedded C/C++, Bare-metal, RTOS, Arduino Framework ► STM32, ESP32, ESP8266, nRF52, CH32, Holtek, PY32 ► Low-level drivers, GPIO, Timers, PWM, ADC, DAC, DMA, Interrupts ► Low-power firmware development and battery optimization ► Custom bootloaders, OTA firmware updates (Wi-Fi/4G) ► Communication protocols: UART, SPI, I2C, RS485, USB ► EEPROM, Flash memory, SPIFFS, NVS, data logging ► Watchdog, fault recovery, offline buffering, and data synchronization ► Firmware debugging, optimization, testing, and validation 📡 IoT & Wireless Communication ► LoRa / LoRaWAN: Point-to-Point, LoRa Mesh, Multi-hop Networking ► Bluetooth Low Energy: nRF52, GATT Services, BLE UART (NUS) ► Connectivity: Wi-Fi, Ethernet, 4G/LTE, TCP/IP ► IoT Protocols: MQTT, HTTP/HTTPS, JSON, Custom Protocols ► IoT Gateways: Sensor-to-Gateway-to-Cloud communication ► Mesh Networking: Routing, Node Management, ACK, Retransmission ► NFC/RFID: PN5180 integration ► GNSS/GPS: GPS modules, UART, UBX protocol ► Remote monitoring, device management, and wireless sensor networks ⚡ Hardware & PCB Design ► Schematic design and multi-layer PCB layout (1–6 layers) ► Analog, Digital, and Mixed-Signal Circuit Design ► Power Supply Design: Buck/Boost DC-DC, LDO, Power Distribution ► Low-Power and Battery-Powered Hardware Design ► MCU, RF Module, Sensor, and Communication Interface Integration ► PCB Layout Optimization, Signal Integrity Considerations ► Component Selection, BOM Creation, and Cost Optimization ► Manufacturing Files: Gerber, BOM, Pick-and-Place ► PCB Bring-up, Hardware Debugging, and Functional Testing 🖥 Displays, Sensors & Automation ► LVGL GUI Development, TFT Touchscreens, LCD, OLED ► Temperature, Pressure, Ultrasonic, and Distance Sensors ► GPS/GNSS, IMU, ADC-Based Data Acquisition ► HX711, Load Cells, Precision Measurement Systems ► Motor Control: BLDC, Stepper, Servo, DC Motor ► Industrial Automation, RS485 Communication, Relay Control ► Sensor Data Processing, Filtering, and Calibration 🛠 Development Tools ► Firmware: STM32CubeIDE, ESP-IDF, PlatformIO, Arduino IDE, Keil MDK ► Nordic: Segger Embedded Studio, nrfx ► RISC-V: MounRiver Studio ► PCB Design: KiCad ► Debugging: J-Link, ST-Link, SWD, OpenOCD, UART Debugging ► Version Control: Git, GitHub 🚀 Projects & Applications I have worked on embedded and IoT projects involving: ✔️ LoRa Mesh networks and multi-node wireless communication ✔️ ESP32 IoT gateways with Wi-Fi, Ethernet, and 4G connectivity ✔️ STM32-based sensor nodes and low-power wireless devices ✔️ BLE communication and GNSS tracking systems ✔️ Industrial RS485 data acquisition and cloud integration ✔️ Custom measurement, monitoring, and automation systems ✔️ Embedded hardware, PCB development, and firmware integration 🏆 What You Can Expect ✅ Clean, maintainable, and well-structured firmware ✅ Reliable hardware designs with practical manufacturing considerations ✅ Efficient communication protocols and power optimization ✅ Thorough debugging, testing, and problem-solving ✅ Clear technical documentation and source code delivery ✅ Professional communication and long-term technical support 🤝 Let's Work Together! Whether you need custom embedded firmware, a complete IoT solution, PCB design, wireless communication integration, or help debugging an existing system, I'm ready to support your project. My goal is to deliver reliable, efficient, and scalable embedded solutions that meet your technical requirements and bring your ideas to life. Let's discuss your project and build something great together!