Freelance Embedded Systems DevelopersFreelance Embedded Systems Developers
ProjectsPeople
simon chen's avatar
simon chen
China
IoT Architect | 15+ Yrs | Prototype to Mass Production
New to Contra
IoT Architect | 15+ Yrs | Prototype to Mass Production
Cover image for LG DUOBO: Full-Stack IoT System
LG DUOBO: Full-Stack IoT System for Dual-Capsule Coffee Machine Project Description [Full-Stack Ownership] I led the entire product lifecycle for the LG DUOBO, translating LG’s vision into a global market-ready product. My team and I developed every layer of the system: * Hardware & Firmware: Designed the core PCBA and Linux firmware for precision brewing and dual-capsule mechanics. * Production Innovations: Implemented One-Device-One-ID on the assembly line and engineered an Auto-Flashing Sub-board(STM8) protocol. This eliminated external programmers (ST-Link) and enabled Full-System OTA updates. * Cloud & App: Developed the complete connectivity stack, ensuring seamless real-time control via mobile applications. [Key Impact] Mass Production Success: Successfully launched globally, meeting Tier-1 industrial quality and security standards. Manufacturing Efficiency: Significantly reduced production time and complexity through automated device-level programming. [Value to Clients] I provide a complete IoT ecosystem. By managing everything from PCBA to App and Production, I eliminate integration risks, reduce R&D cycles by 50%, and deliver low-cost IoT edge computing solutions that are ready for the real world.
0
55
Cover image for Resilient LoRA & WiFi Mesh
Resilient LoRA & WiFi Mesh Solution Overview: Marine-Link is a mission-critical, ESP32+LoRA based IoT ecosystem engineered for large-scale offshore aquafarming and high-standard industrial cleanroom management. As the Lead Architect, I developed a dual-mesh infrastructure that prevents mass biological mortality through real-time telemetry and automates high-power industrial equipment to drive energy efficiency. ► Skills Used: ● Systems/Product architecture. ● PCBA design (Altium/KiCad) ● PHP Laravel + Swoole(server backend) ● VUE UI(HTML5/Javascript) ● Android/iOS APP development(Flutter) ► "One Board, Dual Mesh, Multi-Scenario": A single, high-reliability hardware platform designed to maintain connectivity in the most challenging RF environments: ● Hybrid Mesh Topology: Creates a LoRA mesh for long-range sensor data and a WiFi mesh for localized, high-bandwidth communication. ● Universal PCBA Design: Engineered a single motherboard compatible with both SX1276 and SX1278 LoRA modules, ensuring seamless regional adaptation and supply chain resilience. ● High-Power Actuation: Integrated remote control for high-power BLDC aeration pumps, utilizing smart logic to reduce carbon footprint and electrical waste. ► Key Engineering & Product Features: ● Critical Prevention Logic: Real-time environmental monitoring with predictive alerting to prevent mass fish loss due to water quality fluctuations. ● Deep-Customized HMI: Developed an ARM-based industrial data panel providing localized, real-time visualization of the entire facility grid. ● Cloud-to-Edge Batch Management: Managed via a centralized Web and Mobile (iOS/Android) platform, enabling mass configuration and threshold updates across hundreds of nodes. ● Dual-Purpose Versatility: Originally designed for the harsh conditions of offshore farms, the system's high reliability led to its successful adaptation for High-Standard Cleanroom Management. ● Industrial-Grade Reliability: Engineered for 24/7 operation in high-humidity/high-salinity environments, moving beyond "prototypes" into verified mass production. ► Scalability & Proven Success: ● Mass Production (MP) Ready: This system is currently in its mass-production phase, proving its manufacturability and long-term stability in the field. ● Cross-Industry Impact: Successfully scaled from primary industry (aquaculture) to high-tech manufacturing (cleanrooms), demonstrating a robust and flexible architecture. This project showcases the ability to architect complex, multi-protocol IoT systems that bridge the gap between harsh outdoor environments and sophisticated cloud management. I specialize in creating production-ready hardware that leverages the Pearl River Delta's supply chain to deliver high-performance industrial solutions.
0
50
Cover image for Smart Dual-OS Interactive Hub (Photo
Smart Dual-OS Interactive Hub (Photo Frame & Retro Gaming) Overview: This project showcases a high-end consumer electronics product developed. It is a dual-system device that functions as both a Smart Digital Photo Frame and a Retro Gaming Console. This project demonstrates my ability to lead a product from concept through SoC selection, custom Linux OS development, and cross-platform App integration to final mass production. ► Skills used: ● Systems architecture ● PCB design (Altium/KiCad) ● Linux Kernel/APP development(C/C++) ● PHP Laravel + Swoole(server backend) ● VUE UI(HTML5/Javascript) ● Android/iOS APP development(Flutter) ► Core Technical Architecture: ● High-Performance Hardware: Built on the Rockchip RK3566 SoC with 2GB RAM and 32GB storage, featuring a 10.1-inch 1080P HD touchscreen. ● Custom Dual-OS Implementation: ● ● Smart Frame OS: A deeply optimized Linux-based system using Wayland/Weston and Chromium for the UI layer. ● ● Gaming OS: Ported and optimized the Batocera emulation system to the RK3566 platform, supporting Neo Geo, Sega, Nintendo, and Sony emulators. ● Modern Web Tech Stack: Utilized PHP for backend logic and Vue.js for a responsive frontend, with WebSocket for real-time system-level communication. ► Key Engineering Achievements: ● Immersive 3D UI: Developed a dynamic 3D Earth interface using Three.js, where photos are arranged in a spiral path around the globe for an "Apple-like" interactive experience. ● Media Processing & Optimization: Integrated FFmpeg in the backend for real-time image/video compression and thumbnail generation, ensuring rapid loading and smooth playback of high-definition content. ● Multi-Channel File Management: ● ● Implemented MTP (Media Transfer Protocol) for direct PC connectivity. ● ● Support for external storage expansion via MicroSD and USB (Auto-mount via PHP). ● IoT & Cloud Connectivity: ● ● Mobile App: Developed a cross-platform App using Flutter (Android/iOS) with embedded WebViews. ● ● Seamless Communication: Used MQTT for real-time synchronization between the device, mobile app, and server. ● ● Easy Provisioning: Integrated Airkiss protocol for quick Wi-Fi configuration. ► Manufacturing & Scalability ● OTA (Over-the-Air) Infrastructure: Built a robust server-side management system to provide seamless OTA updates for the OS kernel and App logic, ensuring long-term product evolution. ● Mechanical & Assembly Design: Managed the integration of multiple interfaces (Type-C, USB, MicroSD) and audio modules into a slim, production-ready enclosure. ● Full Lifecycle Management: Provided a complete backend for device binding, multi-user permission sharing, and remote management. I am not just a coder or a circuit designer—I am a full-stack product architect. Whether you need to build a complex Embedded System, optimize your BOM, or bridge the gap between Hardware and Cloud, I have the real-world experience in the Pearl River Delta supply chain to take your idea to mass production.
0
56
Cover image for ARM - Industrial Secure Flashing
ARM - Industrial Secure Flashing & Provisioning System (ARM-to-ARM) Overview: Originally an independent RK3288 ARM Tablet (Ntablet) developed in 2018, this device has been deeply customized into a high-security Industrial Flashing Station. It is designed to manage the secure deployment of encrypted firmware and the automated provisioning of unique device identities (SN) on the factory floor. :► Skills Used: ● Systems architecture ● PCB design (Altium/KiCad) ● Linux Kernel/APP development(C/C++) ● Full-Stack Manufacturing Logic: PHP 8.1 + Swoole + Vue.js for high-concurrency production handling. ● Cloud Integration: Secure MQTT & Cloud-to-Station firmware synchronization. ► Core Technical Capabilities: ● Secure Firmware Deployment: The system fetches highly encrypted firmware from the cloud. This ensures that sensitive intellectual property remains protected even within the factory environment. ● Dynamic SN Activation (One-Unit-One-Code): ● ● During the burning process, the system injects a unique Serial Number (SN) into the target device. ● ● This SN serves as the Decryption Key/Trigger required to activate and boot the encrypted firmware, effectively preventing unauthorized cloning or firmware theft. ► Automated Traceability: ● Automatically triggers industrial printers to generate unique QR codes for each provisioned unit. ● Real-time reporting of every successful "SN-Activation" to the central server via MQTT. ● ARM-to-ARM High-Speed Flashing: Utilizes the RK3288's processing power to directly program target motherboards (e.g., RK3326S/RK3566/RK3562/STM8/STM32/ESP32/ESP8266 and etc) without any specifical programming tool. ● Production Management & Query: Integrated support for Barcode Scanners to query local SQLite databases for device history and QC status. ► Engineering Excellence: ● System-Level Security: Employs LUKS for local disk encryption and OpenSSL for managing the public/private key infrastructure used in firmware decryption. ● Industrial Stability: Features a 7-inch retina HD touch screen and a 4800mAh high-voltage battery, optimized for 24/7 reliability in manufacturing environments. This project demonstrates my ability to build end-to-end secure manufacturing ecosystems. I specialize in protecting client IP through encrypted firmware distribution and ensuring each unit produced is uniquely identifiable and legally activated. I bridge the gap between secure software design and high-efficiency ARM-based hardware production.
0
62
Embedded Systems Developer(11)
Mickael Urbino's avatar
Mickael Urbino
Belgium
Hardware Engineer | PCB Design | Altium Designer
Hardware Engineer | PCB Design | Altium Designer
Cover image for Drone Flight Controller
Drone Flight Controller
1
76
Cover image for Drone ESC
Drone ESC
1
31
Cover image for Video Transmitter
Video Transmitter
0
18
Cover image for HDI PCB for Image Processing
HDI PCB for Image Processing
1
28
Embedded Systems Developer(4)