Aleksei S.

I am an electronics and embedded-systems engineer with an engineering education and nine years of continuous hands-on practice designing, simulating, assembling, soldering, programming, testing, debugging, and improving electronic devices.

My work covers the complete signal and control chain. I interface sensors and electrical signals through suitable analog conditioning, filtering, protection, and measurement circuits; acquire data through MCU ADCs or external measurement ICs; process it in embedded firmware; present results through displays, buttons, rotary encoders, or PC/mobile interfaces; and generate controlled outputs through DAC, PWM, GPIO, communication buses, and feedback loops.

I develop control electronics for relays, MOSFET power stages, linear and switching regulators, DC and BLDC motors, stepper motors, servos, pumps, heaters, access-control mechanisms, and other electrical loads. My strongest demonstrated work combines STM32 control with precision voltage/current measurement, power-supply regulation, adjustable limits, fast protection, temperature supervision, user interfaces, and hardware/firmware integration.

I can help with:
- System requirements, architecture, signal chains, and component selection
- Analog and digital circuit design, sensor interfaces, filtering, and protection
- STM32 embedded C and C++ firmware using STM32CubeIDE and CubeMX
- ADC, DAC, timers, PWM/HRTIM, interrupts, SPI, I2C, UART, and GPIO
- Control algorithms, state machines, alarms, interlocks, and feedback loops
- KiCad schematic capture, PCB layout, BOMs, and manufacturing outputs
- Displays, menus, buttons, rotary encoders, and PC/mobile control interfaces
- Android and Flutter interfaces for connected and controlled devices
- Power supplies, chargers, measurement devices, automation, and actuator control
- Prototype assembly, hardware bring-up, measurements, test plans, and validation
- Review, diagnosis, and repair of non-working third-party schematics, PCBs, and firmware

I can audit an existing project, identify errors in the schematic, PCB layout, power distribution, signal integrity, component selection, protection circuits, or firmware, reproduce failures with measurements, isolate the root cause, and prepare practical corrections. I also perform PCB review and verification, electronic troubleshooting, firmware debugging, failure analysis, and hardware validation.

I use AI-assisted workflows for requirements analysis, firmware and documentation development, test planning, code review, and verification. I remain responsible for engineering decisions, hardware assembly, measurements, debugging, safety, and physical validation.

Public examples include two STM32F103 laboratory power-supply controllers using INA226 measurement and ST7735 displays, including an advanced version with encoder-adjustable current limit and latched hardware cutoff. I have also developed an ATmega328PB component tester with a high-voltage Zener test stage and LC meter. Current STM32G474 work includes an automatic 12 V charger and a digitally controlled 0-50 V laboratory power supply using ADC/DAC control, feedback, protection, and temperature monitoring.

For a new project, I first define the inputs, outputs, loads, operating limits, failure conditions, interfaces, and test criteria. I then divide the work into verifiable stages: requirements and architecture, schematic, PCB, firmware, bring-up, and validation.