Found at “Hypferesp8266-vindriktning-particle-sensor: Wifi MQTT Data Logging via an esp8266 for the Ikea VINDRIKTNING PM2.5 air quality sensor” on 2023-06-11 18:50:52 +02:00.

This repository contains an ESP8266 firmware, which adds MQTT to the Ikea VINDRIKTNING PM2.5 air quality sensor. The modification doesn’t interfere with normal operation of the device in any way. The ESP8266 just adds another data sink beside the colored LEDs.