DFRobot Gravity Heart Rate Monitor Sensor for Arduino

The Gravity Heart Rate Monitor Sensor for Arduino is a thumb-sized heart rate monitor designed for Arduino microcontrollers. Thumb sized heart rate monitor designed for Arduino microcontrollers; Detects blood volume changing in the microvascular bed of tissues; Can be worn on a wrist, a finger, a earlobe or any other areas in contact with skin; Two holes to attach to the included belt; Compatible with Raspberry Pi, Intel Edison, Joule and Curie