The DFRobot heart rate sensor is a finger-sized sensor designed for Arduino microcontrollers. This sensor is a pulse sensor developed based on PPG (PhotoPlethysmoGraphy) techniques. This is a simple and cost-effective optical technique that can be used to detect changes in blood volume in the microvascular system of tissues. The pulsatile component of the cardiac cycle can be easily detected according to this theory.

The sensor features two holes that you can use to attach it to your wrist. You can place it on your finger, wrist, earlobe, or other areas that have contact with the skin. To facilitate the use of this sensor, a Gravity Interface has been adapted to allow for easy connection. The sensor's IO shield is the best option for connecting this sensor to Arduino or other microcontrollers.

The sensor can operate at 3.3V, making it compatible with Raspberry Pi, Intel Edison, Joule, and Curie.

• Input voltage (Vin): 3.3 - 6V (recommended 5V)
• Output voltage: 0 - Vin (Analog), 0/ Vin (Digital)
• Operating current: <10mA
• Dimensions: 28 x 24(mm), 1.102" x 0.945"(in)
• Interface type: PH2.0-3P