Microchip logo
  • All
  • Products
  • Documents
  • Applications Notes

Pulse Oximeter


A pulse oximeter is a non-invasive electro-optical device for measuring both the heart rate and the degree to which the hemoglobin in one’s blood has been saturated with oxygen. This quantity is inferred by measuring the optical transmittance of perfused skin in different wavelengths of light. Red, green and infrared LEDs are convenient and common light sources. Blood oxygen saturation can be determined by comparing the values of Oxy-hemoglobin to Deoxy-hemoglobin. One method for doing this is by shining both a red LED and an infrared LED into a body part (such as a finger or wrist), and then measuring and comparing the relative intensities of the light from each LED in terms of a ratio. This ratio is then typically expressed as the percentage of oxygen saturation.

Pulse oximeter designs call for low power consumption and extensive analog and digital filtering. They are often implemented both as stand-alone medical and fitness devices as well as components of more comprehensive vital sign monitoring systems.

Pulse Oximeter Demo Design Files

pulse oximeter

Check out the design files for a low cost, high-performance pulse oximeter demo

Click here for more information

Single-Chip Wearable Heart Rate Monitor Demo Design Files

smart watch

Check out the design files for a single-chip, wearable heart rate demo

Click here for more information
pulse oximeter diagram

Microchip has what pulse oximeter designers need:

Our dsPIC® Digital Signal Controllers provide high performance digital filtering of optical noise from external light sources and movement.

Lower cost of development with our world-class integrated development tools, MPLAB® X IDE, which encapsulates coding, debugging, software simulation, hardware emulation and device programming in a single interface.

Low-offset, low-noise op amps for amplification and conditioning of photodiode output.

Agency-certified Bluetooth®, Bluetooth Smart and Wi-Fi® modules for fast integration with existing wireless networks.

Medical Video Channel