Sunjun Kim
Ph.D Candidate
South Korea
Summary
🤩
RockstarSunjun Kim is a Ph.D. candidate and HCI researcher at KAIST with 11 years of experience blending human-computer interaction, I/O device design, and mobile UX research. As an assistant professor at DGIST and an active contributor to open-source embedded projects, he brings practical firmware and IoT expertise—most notably enhancing dynamic transmit power and RX diversity in the widely used ExpressLRS radio link. His work spans user-facing interaction design and low-level embedded optimization, allowing him to bridge lab research with deployable hardware-software systems. Based in South Korea, he combines academic rigor with hands-on engineering, often addressing real-world constraints like signal quality thresholds and antenna switching logic. Colleagues describe him as someone who translates deep HCI insights into tangible device improvements that improve both usability and reliability.
11 years of coding experience
Github Skills (12)
firmware10
esp3210
embedded10
frequency10
drones10
c-language10
cprogramming-language10
communications10
sys10
rc10
remote-control10
digital-signal-processing7
Programming languages (7)
Github contributions (5)
ExpressLRS/ExpressLRS
Jul 2021 - Dec 2022
ESP32/ESP8285-based High-Performance Radio Link for RC applications
Role in this project:
Embedded Systems Engineer / IoT Developer
Embedded Systems Engineer / IoT DeveloperContributions:65 reviews, 45 commits, 62 PRs in 1 year 5 months
Contributions summary:Sunjun primarily contributed to the implementation and enhancement of dynamic transmit power features within the ExpressLRS radio link firmware. They added functionality for RSSI-based and LQ-based power adjustments, including thresholds and boost mechanisms. Further contributions involved improving RX diversity, including antenna switching logic and low-pass filter optimization. The user also addressed bug fixes, added a delay after firmware uploads, and updated screen display features.
rcfpvremote-controllinkdrone
SunjunKim/ExpressLRS
Nov 2021 - Mar 2025
STM32/ESP32/ESP8285-based High-Performance Radio Link for RC applications
Contributions:13 PRs, 104 pushes, 104 branches in 3 years 5 months
stm32esp8285rcremote-controlesp8266
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