How to Interface Heartbeat (Pulse) Sensor with Arduino

This biomedical monitoring system revolves around an Arduino Uno microcontroller interfacing with an optical heartbeat sensor and an I2C-compatible OLED display. The heartbeat sensor typically utilizes a photoplethysmography (PPG) approach, combining an integrated optical source (such as an LED) with a photodetector. When a fingertip or earlobe is placed against the sensor, changes in micro-vascular blood volume during each cardiac cycle modulate the amount of light reflected or transmitted to the photodetector. This translates into an analog signal varying with the pulse wave. The Arduino Uno reads this analog voltage through its analog-to-digital converter (ADC) pins, executing software algorithms in the Arduino IDE to detect peaks, filter motion artifacts, and compute the instantaneous pulse rate in beats per minute (BPM). Once calculated, the Arduino packages the data and transmits it using the I2C protocol via the Adafruit SSD1306 library. The OLED display then renders the real-time BPM values visually on screen. Jumper wires complete the necessary power, ground, and signal connections between the sensor module, display, and development board, yielding a compact, self-contained health telemetry demonstrator.