This is a first‑principles walkthrough of a DIY brain‑computer interface that triggers a “shoot” action in a first‑person shooter using one EEG channel centered over C3. I used the BioAmp EXG Pill with an Arduino for digitization and Python for signal processing. The system detects sensorimotor rhythm modulations in the 8 to 30 Hz range and converts them into discrete click events. The goal is to give you a replicable blueprint, plus a critical analysis of what worked, what did not, and how to design a more rigorous second experiment.
