Gravity PPG Heart Rate Monitor Sensor for Arduino & Raspberry Pi

Overview

Gravity: PPG Heart Rate Monitor Sensor for Arduino is a thumb-sized optical pulse sensor designed for quick heart rate experiments and wearable-style maker projects. It uses PPG (photoplethysmography) to detect changes in blood volume through the skin, making it a simple non-invasive way to capture pulse activity with Arduino-compatible boards.

The module offers switch-selectable analog or digital output, so you can use it either for waveform-style signal observation or for straightforward pulse/heart-rate reading in code. The Gravity-style interface keeps wiring easy, and the sensor is also compatible with Raspberry Pi in suitable projects.

This sensor is well suited for education, sports and interactive builds, prototyping, and signal visualization. It is not a medical device, and readings can become inaccurate while the user is moving, so it is best used with the finger held steady.

Specifications

Technical details for the DFRobot Gravity PPG Heart Rate Monitor Sensor.

Usage Notes

The onboard switch selects the module output mode. Make sure the switch position, wiring, and code all match.

• Use Digital mode (D) with digital-style examples and digital input reading.
• Use Analog mode (A) with analog waveform reading and analog input pins.
• If the mode switch, pin connection, and sketch do not match, the sensor will not return valid readings.

For best results, attach the sensor to a finger or other exposed blood-vessel area and keep still while measuring. The onboard LED should flash regularly in sync with the heartbeat once the position is adjusted properly.

Important: This module is intended for hobby, education, and prototyping use only. It is not for medical use and may give unstable or inaccurate readings during motion.