MicroPython rewrite of the Impression 5 giant calculator — 9-digit NeoPixel 7-segment display with 20 physical buttons, running on ESP32 or Raspberry Pi Pico.

ESP32 ESPHome device that monitors a Carrier furnace — reads a differential pressure sensor for filter restriction and a phototransistor to decode blink error codes from the status LED.

Secure garage door access via a Wiegand keypad wired to an ESP32 running ESPHome — PINs are stored as hashes in the config, never in plaintext.