Volodymyr K.

I develop custom electronics and embedded firmware—from the first schematic to a working, tested prototype. My focus is STM32-based systems, industrial interfaces, sensor electronics, and PCB design in Altium Designer. I can take responsibility for both hardware and firmware, or help with a specific challenge: reviewing a schematic, redesigning a PCB, debugging an existing board, or bringing up a new prototype. RECENT PROJECTS • Gigabit Ethernet bridge and serial interface board using KSZ9893 and KSZ9031, with four RS-232 instrument channels, power distribution, and a local display. The prototype is built and working. • Four-channel Ethernet-to-USB gateway using STM32H723, LAN8742A, and FT4232H. It routes network data from remote sensors to four virtual COM ports on a host computer. I developed the hardware and firmware and completed system bring-up. HOW I CAN HELP • Schematic design, component selection, and design reviews • Multilayer PCB layout, mixed-signal design, and high-speed interfaces • STM32 firmware development and hardware integration • Prototype bring-up, measurements, troubleshooting, and board revisions • Sensor interfaces, analog front ends, current and voltage measurement • DC/DC supplies, battery-powered electronics, and motor driver hardware • Manufacturing documentation: Gerbers, BOM, pick-and-place, and assembly files CORE TECHNOLOGIES STM32 F1/F4/H7, Ethernet, USB, CAN/CAN-FD, RS-485/RS-422/RS-232, Modbus RTU, SPI, I2C, UART, and galvanically isolated interfaces. Tools: Altium Designer, STM32CubeMX, IAR Embedded Workbench for Arm, and LTspice. My Upwork record includes 100% Job Success, and Top Rated status. Send me your requirements, existing schematic, or a description of the problem. I can help define the next steps and the deliverables needed to move your project forward.