At the time of the COVID-19 Crisis in April 2021, the author became a homeroom teacher for the first grade in National Institute of Technology (KOSEN), Kumamoto College. We feel that the classroom could not be ventilated smoothly, so we develop and install the CO2 monitor system in the classroom with electric parts on hand quickly. The knowledge required to develop a CO2 monitor system is not limited to circuits and programs. For example, reading electronic parts specifications written in English, operating development tools such as circuit board CAD and circuit simulator, and setting up a Web server to transmit CO2 data are required. After installation of the CO2 monitor system, the author presents the development story of it to students and conduct a questionnaire survey. As a result, we confirm that the CO2 monitor system has effects on the students' study motivation.
https://ror.org/01c697313 
