Raja N.

I help hardware and IoT companies move from schematic to a manufacturable PCB and working firmware, without weeks of design revisions eating into your timeline. I specialize in: - Schematic capture and PCB layout (2-layer to multilayer) in Altium Designer, KiCad, and EasyEDA - ESP32 / STM32 embedded firmware in Embedded C, including BLE and WiFi connectivity - Sensor interfacing and signal chain design for monitoring, classification, and IoT applications - Power electronics: relay/AC switching, SPWM inverter design, and multi-cell (high-voltage) battery management PCB layouts - Battery-powered and power-constrained embedded systems (LiPo integration, regulation, power budgeting) - Manufacturing-ready deliverables: BOM, Gerbers, and JLCPCB/PCBWay-ready files - Custom desktop tooling for hardware bring-up (Python/PyQt serial control and test GUIs) Recent work includes: - Smart sensor & IoT systems: an ESP32-based smart energy meter, a smart agriculture sensor interface with custom PCB, and a sensor integration system for vehicle classification - Power electronics & battery systems: an SPWM sine wave inverter, a 4-channel AC relay switch board, and a high-voltage 20S1P battery management PCB layout in EasyEDA I've also worked on LED controllers and other custom embedded hardware across 5+ years in electronics design. Why work with me: - I communicate clearly and give honest timelines, not optimistic ones - I select components with real availability in mind, not just what's in stock today - My documentation is written so a second engineer — or your fab house — never has to guess If you need a hardware or firmware engineer who can take a product from concept to a working, manufacturable board, send me your schematic, requirements, or a quick project brief. I'll reply with next steps, usually within a few hours. Tools & Technologies: Altium Designer, KiCad, EasyEDA, STM32, ESP32, nRF52, nRF51, Arduino, Embedded C, BLE, WiFi, IoT Systems, Python/PyQt