AD8232 ECG Sensor Module Heart Rate Pulse Kit with Leads and Electrodes

Specifications:

• Input Voltage: 3.3V DC (Operates down to 2.0V)
• Output Type: Analog Output (Rail-to-Rail)
• Integrated Features: Right Leg Drive (RLD) and Lead-off detection
• Filter Architecture: Two-pole adjustable high-pass filter & Three-pole fixed low-pass filter
• Common Mode Rejection Ratio (CMRR): 80 dB (DC to 60 Hz)
• Connector: 3.5mm jack for medical lead cables

Key Applications

• Wearable Tech: Designing smart shirts or wristbands for continuous heart monitoring.
• IoT Healthcare: Building ESP32-based gateways that send ECG data to a mobile app via Bluetooth/WiFi.
• Biometric Security: Researching unique "heartprint" identification systems.
• Education: Demonstrating the physics of biopotentials and signal conditioning in university labs.

Project Evolution

• Past Projects (Prerequisites): If you’ve worked with basic PPG Pulse Sensors (like the Max30102), you’ve seen heart rate as a number.
• Feature Upgrade: The AD8232 upgrades your project from a simple "BPM counter" to a "Cardiac Diagnostic Tool" capable of showing the actual electrical rhythm of the heart.
• Effort/Requirements: This is an Intermediate project. Requires basic soldering skills for the pins and an understanding of analog signal processing.

Virtual Technician & Wiring Guide

⚠️ Safety Warning: NEVER connect this device to a person while your microcontroller is connected to a computer plugged into a wall outlet. Use a battery-powered laptop or a 5V power bank for complete electrical isolation from the mains.

Pin Mapping:

• GND: Connect to System Ground.
• 3.3V: Connect to 3.3V Output (Not 5V).
• OUTPUT: Connect to Analog Pin A0.
• LO- / LO+: Connect to Digital Pins (for lead-off detection).

Package Included:

1 X  AD8232 ECG Sensor Module Heart Rate Pulse Kit with Leads and Electrodes

Frequently Asked Questions (FAQ)

1. Can I run this module on 5V? 
     No, the AD8232 IC is rated for a maximum of 3.3V. Using 5V will damage the chip.

2. Why is my ECG signal so noisy?
    Ensure you are away from high-power AC appliances and that the electrode pads        have good contact with the skin.

3. What do the LO+ and LO- pins do?     
    These pins go HIGH if a lead is disconnected from the body, allowing your code to        alert the user.

4. Do I need a special library for Arduino?  
     No special library is required; a simple analogRead() is sufficient to see the                     waveform.

5. Where should I place the electrodes? 
    Follow the "Einthoven’s Triangle" placement: Right Arm (RA), Left Arm (LA), and              Right Leg (RL).

6. Is this safe for human use? 
    Only when the system is battery-powered and isolated from the mains power grid.

7. Can it measure heart rate through clothes?
     No, the electrodes must be in direct contact with the skin.

8. Does it include the lead wires?
    Yes, this kit includes the 3-pin medical lead cable.

9. Can I use this with an ESP32?
    Yes, the 3.3V logic is perfectly compatible with ESP32 and ESP8266.

10. What is the purpose of the RL (Right Leg) electrode?
       It helps reduce common-mode interference (noise).

11. Can I use generic ECG pads?
       Yes, any standard snap-on ECG/EKG electrode pads will work.

12. How do I filter out 50Hz/60Hz power line noise?
       You can implement a digital Notch Filter in your Arduino code.

13. What is the SDN pin?
       It is the Shutdown pin. Pull it low to put the module into a low-power sleep state.

14. Why is the output waveform upside down?
       Swap the RA and LA electrode positions on the body.

15. Does it work with Raspberry Pi?
      Yes, but you will need an external ADC like the ADS1115 as the Pi lacks built-in              analog pins.

16. Is the sensor waterproof?
      No, the sensor and electrodes must be kept dry.

17. What is the gain of the amplifier?
       The integrated amplifier is configured for a high gain of approximately 100 V/V.

18. Can it detect heart attacks?
       No, this is for hobbyist R&D and educational purposes only, not for diagnosis.

19. How long do the electrode pads last?
       They are intended for single use but can be reused a few times if the gel remains         sticky.

20. What is the frequency response?  
      The module is tuned for the human heart frequency range, typically 0.5Hz to                40Hz.