Show HN: Open a browser by clapping twice (inspired by Iron Man)

Open Chrome (or any file/app) by simply clapping twice — just like Tony Stark.

To figure out what a clap "looks like" in terms of sound, I first recorded a sample clap and ran a Fourier transform on it to check the frequency content. From the analysis, most of the energy from the clap is concentrated around 1.4kHz to 1.8kHz. Based on this, I set up a bandpass filter to isolate only that range and ignore irrelevant noise. After filtering, I used peak detection to recognize when a clap happens in real time. (see figure below) Once two peaks (claps) are detected with some minimum spacing, the system launches Chrome (or any command you define).

💡 Don’t forget to set your Google API key in a .env file. Google offers a free tier for API usage.