LAUSR

In this article, a low-cost and pocket-sized setup for measuring CO2 is presented. This setup is based on Arduinos, making it economic and open to modifications or improvements that satisfy other needs. It is composed of an Arduino board, a CO2 sensor, an SD-card module, and a control panel. The device has been tested in three different experimental contexts that are typically used in primary and secondary science education: chemical reactions, plant photosynthesis and respiration, and gas diffusion. Results show major potential for the device, both for promoting students’ model-based inquiry and for encouraging students to build their own devices and develop engineering practices. The other advantages of the proposal, compared with commercial data loggers, are also discussed.