Can anyone recommend cheap co2 monitors which can be easily queried without vendor specific apps? TIA!
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@jmtd I've been using Zigbee ones in the pub's cellar, 20-40 quid depending on phase of moon and what name the seller on Amazon is going by this week.
@jmtd They look like this. I have no idea if they expose data over the USB port which powers it though!
@jmtd I built my own from SDC40 (https://docs.m5stack.com/en/unit/co2) and ESP32