Compatible with Arduino Uno and mbed ROHM Sensor Evaluation Kit

Heart Rate Sensor Module

Pulse Sensor Module


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Pulse Sensor
Green LED SML-M13MT product information page

An optical heart rate sensor measures pulse waves, which are changes in the volume of a blood vessel that occur when the heart pumps blood. Pulse waves are detected by measuring the change in volume using an optical sensor and green LED. Adopting an optical filter optimized for pulse wave detection in the sensor block minimizes the effects of ambient light such as red and infrared rays. This enables high quality pulse signals to be acquired, even outdoors. In addition, leveraging optical sensor technology cultivated over many years allowed ROHM to significantly increase the sensitivity of the sensor block. Support for low brightness low VF LEDs makes it possible to achieve a low power optical heart rate monitoring system without the need for external circuitry (i.e. boost circuit). This contributes to longer operating times in wearables with limited battery capacity.

Pinout/Shield Information


Circuit Diagram


Board Layout

Hardware Settings

  1. Insert the board into the I2C area
  2. Power Supply Voltage Settings (3.0V)
  3. Connect VLED to 5.0V