The most expensive component was a CO2 sensor which cost $230. The rig uses an Arduino for feedback and control. With a total BOM cost of $350 their solution is cost effective, and provides an ...

While on the search for an alternative to directly buying the fairly expensive MH-Z19 CO2 sensor, [spezifisch] came across a ‘BreeRainz’ branded gadget (also found under other brands ...

Its compact design includes an Arduino board, a CO2 sensor, an SD-card module for data logging, and a control panel with an LED and switch. The system is powered via USB or battery, enhancing its ...