Kean Electronics

Cheap Fingertip Pulse Oximeter Teardown

This is a teardown of a cheap Fingertip Pulse Oximeter available on AliExpress for about US$20 delivered.
A pulse oximeter measures your pulse rate in BPM, and also estimates your blood oxygenation (SpO2) as a percentage.

This is what the unit looks like (yes my pulse is a bit high...)

The front of the PCB with OLED unstuck and folded back to show traces underneath.
Also shows the 9-way FET (JTAG/ICSP) header.

The rear of the PCB - showing MSP430, photodiode, and speaker.
A 4 way flex cable goes from the pads at left to the battery compartment PCB, which also contains the emitter LED.

Additional info and datasheets


The notes, photos, etc, here are my creation and are licensed under the Creative Commons Attribution ShareAlike license
I claim no rights to the intellectual property of the manufacturer, or of the linked datasheets.

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Last updated: 7th Apr 2013