At the beginning of 2021, the Raspberry Foundation announced the Raspberry Pi Pico. As the readers of Elektor magazine know, this is not just another model of the Raspberry Pi family but an independent microcontroller board with the RP2040 microcontroller. You can use the RP2040 to measure air quality. It acquires data from a CO2 sensor and then transmits it via an ESP8266 to the popular ThingSpeak cloud platform.