CO2 Monitoring System
This is an experimental sketch that I wrote for my CO2 Monitoring System. it runs on an ESP32 based development board (LOLIN32) and reads data from a CCS811/HDC1080 breakout board over I2C As well as an MH-Z19B sensor via UART through the SoftwareSerial Library. After reading sensor data, the sketch will publish the data to an MQTT server.
For this to work, you will need to patch the PubSubClient library, specifically the header file and adjust MQTT_MAX_PACKET_SIZE to 256.
Feel free to make any changes or improve on this sketch.