The MAX30100 is a Pulse oximetry heart-rate monitor sensor solution from Maxim Integrated. It combines two LEDs, a photodetector, optimized optics and a low-noise analog signal processor to detect pulse oximetry and heart-rate signals.

There are a few break out boards available that make it really easy to use this solution, I am using this one for my example implementation:

http://www.ebay.com/itm/-/391709438817?ssPageName=STRK:MESE:IT

In this project I have tried to build a sample application using a 0.91" OLED display driven by the U8g2 lib.

http://www.ebay.com/itm/0-91-128x32-IIC-I2C-White-OLED-Display-DIY-Module-DC3-3V-5V-For-PIC-Arduino-/391709456117?hash=item5b33b3f6f5:g:azEAAOSw2gxYqojI

Here's a video demostrating the project https://youtu.be/63iZt5M-cik