I was wondering is there a way to calculate SpO2 using a pulse sensor? I calculated BPM and stress before with pulse sensor and now I want to calculate SpO2.
Link to Pulse sensor manual
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For measuring oxygen saturation (SpO2) with a pulse sensor, you need to use the fact, that hemoglobin, that carries oxygen, will reflect in different light wave lengths, as hemoglobin, which doesn't carry oxygen. But that also means, that you need to use light in at least 2 different wavelengths. Common are one red (about 660nm)(though green may also work) and infrared (about 940nm). When lighted sequentially with both LEDs, you can measure the refection of both parts and calculate the ratio between them (SpO2).
But your sensor only has 1 LED, which is green. So you cannot measure SpO2 with this sensor. You need one fitting the above description.