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.

ESPHome config for an ESP32 Wiegand keypad reader built on a thin-edge philosophy — the device only captures input and relays it to Home Assistant; all access-control logic stays in the hub.