Does Silicon Labs offer the SpO2 solution? If so, which sensor can be used to measure SpO2? Any example code available?
Red and IR LEDs are required for SpO2 measurement. Silicon Labs offers the SpO2 solution with Si1171K1-GM module, which has integrated 1 Green, 1 Red, and 1 IR LED. (https://www.silabs.com/products/sensors/biometric/si117x/device.si1171k1-gm)
SpO2 measurement can work on the finger-tip, but not on the wrist as the signal quality on the wrist is not good enough
for SpO2 calculation.
Silicon Labs provides the source code for finger-tip based HRM&SpO2 algorithm. The example project, as well as the user's guide, can be downloaded from the link below.