Heart Rate Variability Logger Kit with Arduino Nano – Record Every Heartbeat Interval for Real Analysis

Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.

Transform raw fingertip pulse signals into a timestamped dataset you can analyse offline. This kit guides you through assembling a portable logger that captures every inter-beat interval from the KY-039 sensor, stamps it with exact date and time using the DS3231 RTC, and writes the data to a microSD card. Whether you are preparing a school science exhibit, an engineering minor project, or just exploring how your heart responds to daily activities, you will finish with a working HRV recorder and a clear understanding of each stage in the signal chain.

What You'll Build

A standalone device that clips onto your fingertip, filters the optical pulse waveform, detects individual heartbeats with a peak-finding algorithm, computes the time between successive beats in milliseconds, and logs every interval alongside the real-time timestamp. A sharp 0.96‑inch OLED displays live heart rate and logging status while the session runs. The output is a CSV file on an SD card ready for tools like Excel, Python, or the open‑source HRV analysis library Kubios HRV.

What You'll Learn

• Filter and amplify a photoplethysmogram (PPG) signal using analogue front‑end techniques with the KY-039 sensor and passive components
• Implement a heartbeat detection algorithm that finds peaks in noisy, low‑amplitude waveforms
• Synchronise sensor data with a DS3231 real‑time clock over I²C so every beat carries an accurate timestamp
• Structure time‑series data and write it efficiently to a microSD card via SPI

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

Who This Kit Is For

CBSE Class 11–12 students creating a health‑tech project for science fairs, B.Tech ECE/EEE undergraduates assembling a biomedical instrumentation lab, Smart India Hackathon teams prototyping a wearable vitals logger, and ATL Tinkering Lab innovators who want to move beyond basic heart‑rate displays into the deeper world of HRV analysis. The intermediate build assumes familiarity with Arduino IDE and breadboard wiring, making it a natural next step after introductory electronics.

Built and Backed by Compoden

Every Compoden kit ships with an AI build companion trained on this exact project — accessible via a QR code on the box, with WhatsApp and email backup. We've spent 10 years building projects for makers, schools, and institutions across India. If a part fails because of a manufacturing defect, replace it free within 7 days.