For fun, I made something like this with a $10 Raspberry Pi Zero, a $11 NDIR sensor from China, a $20 ePaper display, and a few dollars of plastic once I get around to printing a case. I imagine something professional would need some more refinement, but there’s a huge gap between $45 and $179. It’s too bad these kinds of things aren’t cheap and ubiquitous. We mainly use our sensors a reminder to open windows.
2 Likes
