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The pulse sensor uses an optical detection method to measure variations in blood flow through the fingertip with each heartbeat. The Arduino Nano reads these continuous analog signals via its analog input pin, compares them against a predefined threshold to identify individual beats, and calculates the time difference between them to output the final beats per minute (BPM) on the serial monitor or an optional OLED display.
Why Build This
Great beginner project for exploring wearable technology
Learn fundamental signal processing and analog reading techniques
Affordable way to build a functional vital sign monitor
Real-World Application
Heart rate monitoring technology is widely used in wearable fitness bands, smartwatches, and clinical patient monitoring devices to track cardiovascular health and physical exertion levels.
Skills You'll Learn
Analog sensor interfacing with Arduino
Threshold detection and signal processing
Real-time data visualization on OLED displays
Basic wearable electronics assembly
Safety Precautions
Always double-check your wiring connections before powering the circuit to prevent short circuits. Ensure you are using a regulated 5V power supply to avoid damaging the Arduino Nano or the connected modules. Keep components dry and handle the bare circuit boards with care to prevent electrostatic discharge.
Technology Tags
ARDUINO NANO
PULSE SENSOR
OLED DISPLAY
JUMPER WIRES
BREADBOARD
Frequently Asked Questions
Yes, the code and wiring are nearly identical for an Arduino Uno, though the Nano is chosen for its compact size which makes it better suited for wearable projects.
No, the OLED display is optional. If you do not have one, you can still view your real-time heart rate readings using the Arduino IDE Serial Monitor.
You can power the Arduino Nano via a standard USB connection to your computer or through a regulated 5V power source suitable for portable setups.
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