This ESP32 synth does everything, including summoning evil spirits

A hacker has created DIVINER, a firmware replacement for the M5 Cardputer—a credit-card-sized ESP32-S3 dev board with a tiny screen, keyboard, and audio jack. It transforms the device into an all-in-one occult synthesizer and sequencer with a Diablo-inspired visual theme, calling its apps 'rites' and layering in WiFi/Bluetooth scanning, presence detection via CSI, an LLM interface, an IR blaster, and even a byte-beat player.

For engineers and tinkerers, it's less a cohesive tool and more a chaotic tech demo crammed into a tiny form factor, showcasing what's possible when you throw every conceivable feature at a small dev board. While the audio engine looks fun and the 'blood and ember' graphics are striking, the real takeaway is that sometimes the weirdest projects are the most entertaining—even if they feel like a mad scientist's weekend experiment.