projects

Ongoing research and engineering projects in liquid-metal electronics, wearable bioelectronics, and electrochemical biosensing.

research
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PDA-LM Ink

Post-treatment-free liquid-metal ink via catechol–Ga³⁺ coordination — a 10-minute deep dive
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Water-Transfer Electronics

Hydroprinted liquid-metal circuits transferred onto skin via PVA carrier
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PDRN Bio-Coating

Dual anti-fouling + tissue-regeneration coating for sutures and intramuscular EMG

engineering
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STK RevM20 sensor front end

Simultaneous electrochemical sensing on a compact four-layer flex PCB
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AD5941 EC Sensor Toolkit

Portable 4-channel electrochemical sensor based on AD5941 + ESP32-C6

interests
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Multimodal Bioelectronics

A design concept — one wearable front end for electrochemistry, EMG and stimulation
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Wearable BCI

A direction I want to work in — non-invasive ear-EEG with soft, liquid-metal contacts

code & repositories

All open-source code, hardware files, and project repositories live on GitHub. Browse the active repositories below or visit the full profile.

  View all repositories on GitHub →

  STK RevM20 engineering records

Design choices and verification for a three-channel current and pH front end on four-layer FPC.

Read the hardware case study →

Mixed-signal hardware · FPC · Measurement validation

  Biopotential-EXG-sPCB

Stretchable PCB reconstruction of the BioAmp EXG Pill biopotential front-end, with liquid-metal printing and AutoCAD mask design for the soft-PCB form factor.

Hardware KiCad sPCB

  charleskim990819.github.io

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