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You could also get a CO2 sensor from Adafruit for $50, connect it to an Arduino, Raspberry Pi, or other controller, and roll your own solution. It's a little ha
by hugs 4y ago
You could also get a CO2 sensor from Adafruit for $50, connect it to an Arduino, Raspberry Pi, or other controller, and roll your own solution. It's a little hacky, but this is HN after all. https://www.adafruit.com/product/5187 https://www.adafruit.com/product/5187
- zdragnar 4y agoI can't speak to the accuracy or quality, but there's plenty of dedicated CO2 monitoring devices on amazon for under $100. A few seem to have good reviews, anyway.
- genewitch 4y agoI have a couple (either 2 or three, i can't remember) from amazon that were under $100. Both have built in batteries, and one is designed to be charged and then placed in a greenhouse while you're working in it, another is designed to reference between two "rooms" or whatever. None of them log to sd card. I'd fully expect a functional solution that does logging with all of the other features to cost more than $100, but if i can be proven wrong, i'd buy one, for sure. For example, with an SD card we now also need a clock - which ideally would have a different power supply than the sensor suite, otherwise the timestamps will overwrite if the supply is lost, or otherwise be incorrect.
- groby_b 4y agoI was going to comment on accuracy, but looks like this one is actually pretty good! Definitely the same ballpark as ara4. (I mean, building the thing would subtract several hours of time one could spend commenting on HN instead, so choose accordingly :)