about

I'm Lecheeel. I work on embedded systems and software, with an interest in how computational models, control logic, and hardware fit together.

My embedded work involves microcontroller firmware, digital interfaces, circuit design, and PCB layout. I'm interested in high-speed layout, differential pair routing, impedance control, and signal integrity, including how clock distribution and return paths affect a design.

I'm particularly interested in FPGA-based control for ultrasonic phased arrays, including multichannel phase synthesis, synchronized waveform generation, and coordinated parameter updates across an array.

I'm also exploring the acoustic side: wave superposition, phase compensation, acoustic radiation forces, and the relationship between a calculated field and a stable trapping position. Three-dimensional particle manipulation brings these topics together with trajectory generation, array calibration, and experimental measurement.

On the software side, I've been studying Android platform internals through AOSP, framework services, Binder IPC, and HAL interfaces. I'm interested in how service lifecycles, process boundaries, and hardware interfaces shape system behavior. Related areas include GNSS data processing, NMEA parsing, and the GKI architecture, including the Kernel Module Interface (KMI) and vendor modules.

Across these areas, I like tracing the details that affect a system's behavior, whether that's timing between output channels, calibration errors in an array, or a request moving through Android's framework and kernel interfaces.

This site is where I document selected work and explain the technical details behind it. You can find my public repositories onGitHubor contact me by email.