We peeped this multi-gas MOX sensor from ScioSense – the ENS160 has I2C and SPI and even comes with a ready-to-go driver! https://github.com/sciosense/ENS160_driver so it would make for a cute QT sensor. Only thing to watch for if you wanna use it: there’s a dual power supply requirement for the core and io voltage, we used a dual LDO that we’ve used for other boards before. We’ll get some sensor chips on the way and try out this driver!
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I wasn’t going to leave a comment until I saw the “I AM NOT A ROBOT” resistor. I couldn’t help myself. Best implementation ever!