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For less than 50€, you can get your hands on this tiny and easy to use sensor to monitor O₂ concentration up to 25%. https://www.seeedstudio.com/Grove-Oxygen-Sensor-ME2-O2-2-p-1541.html The problem is, the documentation is really crappy. After hours of searching and testing to find the actual working example…
While developing for the IoT2040 from Siemens (see the product page), I was having difficulties with the I2C bus; specifically, some peripherals were slow to respond or somehow buggy and the bus was becoming unresponsive. On this device, the I2C bus is behind an extender, and it seems not very…