Build a $40 WiFi e-reader
A build guide for a homemade ESP32-S3 e-paper reader: parts, how to choose an e-ink panel, power options with or without a battery, and an automated news brief pipeline using Claude Code routines and a small server.
About $40 in parts
A $13 radar trip wire for your hallway
Count people walking in and out of a room and log overnight movement with a $3 mmWave radar and an ESP32.
About $13 in parts
More guides land here as the side projects finish. The dev log has the unfinished versions, mistakes included.