I am working on an a Raspberry Pi based, internet connected indoor air quality monitor called LiV. LiV is an open source hardware and software project. LiV measures temperature, humidity, air pressure and CO2 levels. This project is about sending measurement reports tweets from LiV Pi using IFTTT.
I am including a few links that would help you understand how this has been done.
I am also including a github link to the Python source code below.