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Sensors convert a physical quantity (e.g. temperature, pressure) into an electrical signal.

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Using an arduino to measure a voltage in the range of 0-20mV

I'm building a control panel for an old altitude training machine and I need to measure the output of an oxygen sensor with an arduino. … The oxygen sensor (medical oxygen sensor OOM202) is a micro fuel cell which outputs a voltage between 200μV and 20mV depending on the oxygen level. …