Heart Rate Sensor Module MAX30102 Pulse Detection Blood Oxygen Concentration Compatible for Arduino STM32 (Pack of 2)

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The sensor itself works OK, in that the raw heartrate signal looks reasonably useful at first glance. However I would say the calculated BPM and SPO2 values from the Sparkfun MAX3010x library for Arduino are rather underwhelming, so far as consistency and accuracy. I think this might look better with some more software effort, but that remains to be seen. If there's any motion or change in pressure of the sensor against the skin, that swamps the signal. I provided +5V in to the board; it has its own 3.3V and 1.8V regulators for the chip. You need to either provide your own I2C pullup resistors offboard, or solder-bridge 2 out of the 3 the tiny pads on the back to select a 3.3V or 1.8V level pullup for the I2C signals SDA, SCL.

Working as expected, I’m using a ESP32-S3 module

For starters, the product is not the same one that they advertise. This is like a cheap knock off version of the original sensors. The sensor did not turn at all. Both sensors didnt turn on. They were faulty and was unable to get them to power on. I'm very disappointed in my purchase and can't even get a hold of the seller to talk to him about it.