There are many indoor temperature and humidity meters and loggers already built. But there is always a space to do something new and useful in this area. Davide decided that measuring temperature and humidity isn’t enough for complete climate meter, so he added CO2 meter.
His project consist of NDIR infrared MZ-Z14 CO2 meter, DHT22 temperature and humidity sensor. Atmega328 reads sensor data, displays it on LCD screen and also logs to xively.com feed. Connection to internet is established with network board based on EC28J60. Where most of project code he brought from his previous projects.