Pulse Heart Beat Rate Amped Sensor for Arduino Raspberry

Specifications:

• Operating Voltage: 3.0V to 5.5V DC
• Current Draw: ~4mA at 5V DC (Ideal for battery-powered wearable prototypes)
• Sensor Type: Optical (Green LED with high-sensitivity photodetector IC)
• Output Signal: Analog wave voltage (0V to VCC)
• Diameter: 0.625 inches (~16 mm)
• Overall PCB Thickness: 0.125 inches (~3 mm)

Key Applications:

• Wearable Fitness Trackers: Prototype custom smart bands with real-time biometric tracking.
• Biometric Security Gates: Create user authentication locks triggered by verified alive pulse presence.
• Interactive Art Installations: Sync LED arrays or music tempos dynamically to a user's heartbeat.
• HCI Prototyping: Human-computer interfaces utilizing heart-rate variability (HRV) calculations.

Pin Mapping

• RED Wire (+): Connect to 3.3V or 5V Power Supply Rail.
• BLACK Wire (-): Connect to System Ground (GND).
• YELLOW Wire (S): Connect to Analog Input Pin (e.g., Pin A0 on Arduino Uno / ADC0 on expansions).

Package includes:

1 X Pulse Heart Beat Rate Amped Sensor Module for Arduino & Raspberry Pi

Frequently Asked Questions (FAQ)

1. How do I get stable heart rate values?
   Ensure steady, moderate pressure against the sensor face using the hook-and-loop strap. Excessive pressure flattens blood vessels, while light pressure introduces movement artifacts.
2. What interface does this sensor use?
   It outputs a pure analog voltage waveform that scales dynamically between 0V and your VCC supply rail.
3. Can I use this pulse sensor directly with a Raspberry Pi? Standard Raspberry Pi single-board computers lack hardware ADC channels. You will need an external ADC module like the ADS1115 to convert the analog signal.
4. What library do I install for Arduino?
   Search for and install the official "PulseSensor Playground" library via the built-in Arduino Library Manager.
5. Why does my serial plotter show a flat line?
   Verify your analog input pin configuration in code matches your physical wire connection, and ensure the module is getting at least 3V.
6. Is the sensor waterproof?
   No, the module has exposed PCB components. Do not submerge it or expose it directly to liquids.
7. How do the transparent vinyl dots work?
   They provide an electrical insulation barrier across the optical side to protect the circuit traces from skin moisture and sweat.
8. What causes false BPM spikes?
   Rapid movement or sudden changes in ambient light exposure are the primary causes of false software readings.
9. Does this sensor measure SpO2 blood oxygen levels?
   No, this is a single-wavelength green light sensor designed specifically for heart rate detection, not pulse oximetry.
10. What is the current draw of the module?
    The module draws a low current of roughly 4mA at 5V, making it friendly for battery operation.
11. Can I use this at 3.3V with an ESP32?
    Yes, it operates efficiently down to 3.0V. The analog voltage peaks will scale appropriately within the ESP32’s 3.3V limit.
12. How does the onboard operational amplifier help?
    The onboard op-amp automatically amplifies the microscopic changes in light reflection, making the pulse waveform visible to standard ADCs.
13. What is the wavelength of the embedded LED?
    It features a high-efficiency green light LED running at approximately 525nm, optimized for tissue blood flow tracking.
14. Can this sensor measure heart rate from the earlobe?
    Yes, the earlobe and the fingertip are both excellent zones for tracking blood flow pulses with this module.
15. How should I attach the hook-and-loop strap?
    Wrap the strap around your finger snugly but comfortably, leaving the optical element directly centered over the fleshy pad of your finger.
16. Why does ambient sunlight interfere with the readings? Extreme external infrared or solar rays can overload the sensitive photodetector, washing out the green light signal pulses.
17. What sampling rate is ideal for this sensor?
    A regular hardware sampling interval of 2ms (500Hz) is highly recommended for accurate pulse waveform extraction.
18. How do I clear interrupt conflicts with other libraries?
    You can configure the PulseSensor Playground library within your code setup to run via simple polling loops instead of micro-timer interrupts.
19. Can I run multiple pulse sensors on one board?
    Yes, as long as your microcontroller has multiple separate analog input pins available to poll.
20. Is this medical-grade hardware?
    No, this component is intended purely for prototyping, evaluation, and educational engineering applications.