Arduino Heart Rate Monitor with Pulse Sensor & LCD DIY Kit

What Is This Product?

The Arduino Heart Rate Monitor System is an educational biomedical electronics project designed to demonstrate how a pulse sensor can detect a heartbeat and display the calculated heart rate in BPM (Beats Per Minute).

The project combines an Arduino UNO compatible controller, an optical heart rate pulse sensor, and a 16×2 LCD with I2C interface. When a finger is positioned correctly on the pulse sensor, the sensor detects pulse-related optical changes and sends the signal to the Arduino. The Arduino processes this information and displays the calculated heart rate on the LCD.

The Arduino supplied with the RoboGears kit is pre-programmed / ready programmed, so coding is not required for initial operation. Students can focus first on assembly, wiring, sensor placement and understanding the measurement principle.

The project is particularly useful for learning biomedical sensing, Arduino programming, signal processing, I2C communication and real-time data display.

How It Works

Finger → Pulse Sensor → Arduino UNO → BPM Calculation → 16×2 LCD

This demonstrates the embedded-system sequence:

Sense → Process → Calculate → Display

Important: This is an educational/prototyping project and is not a certified medical diagnostic device.

Compatibility

Compatible With

• Arduino UNO ecosystem

• Arduino IDE

• Heart rate pulse sensor modules

• 16×2 LCD displays

• I2C LCD interface modules

• 5V Arduino projects

• Biomedical electronics projects

• STEM educational projects

• Embedded-system experiments

Programming Requirement

Coding is NOT required for initial operation.

The Arduino UNO compatible controller supplied with the RoboGears kit is:

PRE-PROGRAMMED / READY PROGRAMMED

Students can first assemble and operate the project using the supplied program.

The Arduino can later be reprogrammed to experiment with:

• BPM calculation logic

• Display formatting

• Pulse detection

• Serial-monitor output

• Warning indicators

• Data logging

• Additional compatible sensors

Measurement Requirements

For better pulse detection:

• Place the fingertip gently on the sensor

• Keep the finger reasonably still

• Avoid excessive pressure

• Keep jumper connections secure

• Use stable power

• Allow the reading time to stabilize

Before Purchase

This product is an educational biomedical electronics project.

It demonstrates heart-rate sensing and BPM calculation, but it is not intended to replace certified medical heart-rate monitoring equipment.

Project readings should not be used for:

• Medical diagnosis

• Medication decisions

• Emergency assessment

• Clinical monitoring

• Treatment decisions

Applications

• Arduino heart rate monitor

• Pulse sensor project

• BPM measurement demonstration

• Biomedical electronics learning

• Arduino sensor interfacing

• I2C LCD interfacing

• Embedded-system projects

• STEM education

• School science exhibitions

• College mini-projects

• Engineering demonstrations

• Healthcare-electronics prototypes

• Arduino programming practice

Who Is This Kit For?

Suitable for:

• School students

• College students

• Engineering students

• Arduino beginners

• Biomedical electronics learners

• Electronics hobbyists

• STEM laboratories

• Science exhibitions

• Embedded-system learners

• Project-development workshops

📦 What's Included

❌ What's Not Included

The current package does not list the following as included:

• Laptop / Computer

• Medical-Grade Heart Rate Monitor

• Certified Medical Equipment

• Permanent Project Enclosure

• Decorative Exhibition Base

• Additional Sensors

• Additional Arduino Boards

• Data-Logging Hardware

Important Package Note

This package is supplied as an educational Arduino project kit, not as a medical monitoring product.

Actual component colour, PCB design, manufacturer marking or equivalent hardware revision may vary according to available stock while maintaining the intended project functionality.

📚 Resources

Arduino Project Code

RoboGears provides the Arduino project code through the Code Link available on the product page.

The Arduino supplied with the kit is pre-programmed / ready programmed, so uploading code is not required for initial operation.

The project code can later be studied or modified to understand:

• Pulse sensor interfacing

• Heartbeat detection

• BPM calculation

• LCD output

• I2C communication

• Real-time sensor processing

• Arduino programming

Getting Started

Step 1 — Identify the Components

Identify:

• Arduino UNO SMD

• Heart rate pulse sensor

• 16×2 LCD

• I2C LCD interface

• Female-to-female jumper wires

• USB cable

• 9V battery

• Battery snap

Step 2 — Prepare the LCD

Connect the I2C interface to the 16×2 LCD according to the supplied project configuration.

The I2C interface simplifies the number of Arduino connections required for the display.

Step 3 — Connect the Pulse Sensor

Connect the pulse sensor to the Arduino according to the RoboGears project wiring.

The physical connections must correspond with the supplied pre-programmed Arduino configuration.

Step 4 — Connect the LCD

Connect the I2C LCD to the Arduino according to the project wiring.

Verify:

• VCC

• GND

• SDA

• SCL

Step 5 — Check All Connections

Before applying power, verify:

• Sensor power

• Sensor signal connection

• LCD power

• I2C wiring

• Common ground

• Jumper-wire connections

Step 6 — Power the Project

For initial testing, USB power is recommended.

The supplied 9V battery can also power the system through the intended Arduino power input.

Step 7 — Position Your Finger

Place your fingertip gently on the pulse sensor.

Avoid excessive pressure and unnecessary movement.

Step 8 — Wait for the Reading

Allow the sensor and Arduino sufficient time to detect the pulse pattern and calculate the BPM value.

Step 9 — Observe the LCD

The calculated heart-rate reading should appear on the 16×2 LCD as BPM – Beats Per Minute.

Step 10 — Experiment

Once the original project operates correctly, students can study or modify the Arduino program to explore:

• Pulse detection

• BPM calculations

• Display formatting

• Serial-monitor data

• Additional indicators

🔧 Engineering Notes from RoboGears

1. Keep the Finger Still

Finger movement can make pulse detection unstable.

Keep the fingertip reasonably still while waiting for a BPM reading.

2. Avoid Excessive Pressure

Pressing the sensor too hard may affect the optical signal.

Place the finger gently and consistently over the sensing area.

3. Use Stable Power

For initial testing, USB power is recommended.

Stable power helps reduce:

• LCD flickering

• Arduino resets

• Irregular sensor behaviour

• Measurement instability

4. Keep Jumper Wires Short and Secure

Loose or unnecessarily long sensor connections can increase electrical noise and produce unstable behaviour.

5. Test the Sensor Before Final Assembly

Before building a permanent project enclosure, confirm:

• Arduino powers correctly

• LCD operates

• Pulse sensor responds

• BPM values appear

• Connections remain stable

6. Check the I2C LCD Carefully

If the LCD powers ON but no characters are visible, check:

• SDA

• SCL

• VCC

• GND

• LCD contrast

• I2C configuration when modifying the program

7. Don't Expect an Instant Reading

The Arduino needs a usable pulse signal before a meaningful BPM calculation can be displayed.

Keep the finger stable and allow the system time to collect pulse information.

8. Establish a Baseline Before Modifying Code

First confirm that the supplied pre-programmed project operates correctly.

Only then begin changing:

• BPM logic

• Display format

• Sampling behaviour

• Serial output

• Additional indicators

This makes troubleshooting much easier.

9. Understand the Difference Between Heart Rate and SpO2

This project is designed to demonstrate heart-rate/BPM measurement using a pulse sensor.

It should not be advertised as measuring SpO2/blood oxygen saturation unless the supplied hardware specifically supports that function.

For SpO2 projects, a suitable pulse-oximetry sensor such as the MAX30102 configuration is required.

10. Treat the Reading as Educational Data

This Arduino project is useful for learning how pulse sensing works, but it is not calibrated or certified as clinical medical equipment.

⚠️ Common Troubleshooting

No BPM Reading

Check:

• Pulse sensor connection

• Finger position

• Arduino power

• Sensor signal connection

• Jumper wires

Keep the finger still and try again.

BPM Reading Is Unstable

Possible causes include:

• Finger movement

• Excessive pressure

• Loose jumper wires

• Electrical noise

• Unstable power

• Poor sensor positioning

LCD Is Blank

Check:

• 5V and GND

• SDA/SCL connections

• I2C module

• LCD contrast

Arduino Works on USB but Not Battery

Check:

• 9V battery condition

• Battery snap

• DC jack connection

• Arduino power input

LCD Flickers or Arduino Resets

Inspect the power supply and wiring for unstable voltage or loose connections.

Engineering Principle

Reliable pulse measurement depends on the complete signal chain:

Finger Placement → Optical Pulse Detection → Signal Quality → Arduino Processing → BPM Calculation → LCD Display

Poor input signal quality cannot always be corrected by software.

FAQ

1. What does this project measure?

The project measures and displays heart rate in BPM – Beats Per Minute.

2. Is the Arduino included?

Yes.

The kit includes:

1 × Arduino UNO SMD Compatible Board

3. Is the Arduino pre-programmed?

Yes.

The Arduino supplied with the RoboGears kit is pre-programmed / ready programmed, so coding is not required for initial operation.

4. Which sensor is included?

The kit includes:

1 × Heart Rate Pulse Sensor Module

It uses optical pulse detection for the educational heart-rate monitoring project.

5. Is the LCD included?

Yes.

The kit includes:

• 1 × 16×2 LCD

• 1 × I2C Interface Module

6. What does the LCD display?

The project displays the calculated heart rate as:

BPM – Beats Per Minute

7. Is a battery included?

Yes.

The package includes:

• 1 × 9V Battery

• 1 × 9V Battery Snap with DC Jack

8. Is a USB cable included?

Yes.

The current kit includes 1 × USB cable.

9. Do I need coding knowledge?

No coding is required for initial operation because the supplied Arduino is pre-programmed.

Arduino programming is useful if you want to study or modify the project later.

10. Can I change the Arduino program?

Yes.

The controller is Arduino IDE compatible and can be reprogrammed.

11. Does this project measure SpO2?

The standard Heart Rate Monitor System is designed to demonstrate heart rate/BPM measurement.

SpO2 should not be claimed unless the project uses a compatible blood-oxygen/pulse-oximetry sensor designed for that measurement.

12. Why does the BPM reading fluctuate?

Possible causes include:

• Finger movement

• Incorrect finger placement

• Excessive pressure

• Electrical noise

• Loose connections

• Unstable power

13. Is this a medical device?

No.

This is an educational Arduino/biomedical electronics project and is not a certified medical diagnostic device.

14. Can I use the reading for medical decisions?

No.

Do not use project readings for diagnosis, medication decisions, treatment, emergency assessment or clinical monitoring.

15. Is assembly required?

Yes.

Wiring, assembly, sensor positioning and testing are required.

The Arduino is supplied pre-programmed, so coding is not required for initial operation.

16. Can the components be reused?

Yes. The Arduino, pulse sensor, LCD and I2C module can be reused in compatible electronics and embedded-system projects.

Important Note

This kit is intended for educational, DIY, STEM and prototyping purposes only.

Displayed BPM values should be treated as educational/project readings rather than clinical measurements.

The supplied Arduino is pre-programmed / ready programmed, so coding is not required for initial operation. Assembly, wiring, sensor positioning and testing are still required.

Actual component colour, PCB revision or equivalent hardware appearance may vary depending on available stock while maintaining the intended project functionality.