No-login AI chat
KCNA · CKA · CKAD quizzes
AI-drafted post images
ESP32 LED clock faces
GrowthBook flags on the dots
Kubernetes playground
YAML, JSON, configs
Pretty print code
Base64, URL, hashes
Timestamps, units, colors
Validate & clean YAML
UUIDs, passwords, keys
Rhythm Hands is a little browser rhythm game I built for my kid. This post wires a physical drum to it: a piezo sensor on an ESP32 DevKit, a threshold-and-debounce sketch, and Web Serial reading hit events straight into the game with no server in between. Includes the two bugs that ate the afternoon.
Part 5 of the self-hosting series: a round AMOLED ESP32-S3 on my desk that records my voice, transcribes it, asks my local Qwen, and speaks the answer back. The full pin map, the two audio chips nobody explains, and the clock-register byte that cost me a day of silence.
Part 4 of the self-hosting series: wiring Redis's agent-memory-server into the site's AI chats, entirely on local hardware. Durable memory with no login, an exam coach that remembers your weak spots, and the mistakes I made getting there.