Imagine steering a game with nothing but a blink and a glance. That’s the spark behind our latest build: a noninvasive brain-computer interface that runs entirely on a tiny edge microcontroller, translating eye movements into reliable, real-time commands without a laptop or cloud.

We start with the human why. Millions live with neurological conditions that constrain movement but preserve eye control—a narrow channel with huge potential. We compare the promises and trade-offs of invasive BCIs like Neuralink, BrainGate, and Synchron against accessible wearables from Emotiv, Muse, and OpenBCI. The big gap is obvious: people need precise, low-latency control without surgery, high cost, or a desktop tether. Our approach uses electrostatic charge sensing with a glasses-ready electrode layout at the nose bridge and a reference behind the ear, capturing strong ocular signals that are practical for daily wear.

From there, we break down the full on-device pipeline. A high-pass filter removes drift, a 50 Hz notch kills power-line noise, and a low-pass smooths the signal so a smaller model can focus on meaningful features. A lightweight Z-score event detector stays always-on and wakes the classifier only when something happens, buffering a 300-sample window at 240 Hz across two channels. The classifier is a tiny 1D CNN—convolution, ReLU, pooling, softmax—clocking about 0.76 ms inference with roughly 18 KB flash and 6 KB RAM. With K-fold cross-validation on nine participants, we see around 90% accuracy for four classes: discard involuntary blinks, map voluntary blinks to “click,” and detect left and right glances.

We showcase it with a playful demo: blink to jump over obstacles, glance right to change lanes and collect coins. Beyond the fun, the implications are serious—restoring agency with affordable hardware that works off-grid in real time. We close by outlining what’s next: integrating the sensors into everyday glasses, testing across more users and environments, and adding quick calibration for personalization. If accessible control matters to you—whether for assistive tech, gaming, or new hands-free interfaces—this is a glimpse of what near-future wearables can do.

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