Features
- AD8232 IC for signal conditioning of cardiac bioelectrical signals
- Low power consumption for battery-operated use
- Single-lead ECG monitoring
- Includes sensor pads to attach to the skin
- Versatile for monitoring various vital signs
- Compact size for integration into wearable devices
- Easy to use with clear instructions
- Cost-effective compared to other medical monitoring devices

Specifications
- Power voltage: DC 3.3V
- Output: Analog
- Interface: RA, LA, RL (3-pin, 2.54mm header or earphone jack)
- Dimensions: 36 x 31 x 18mm
- Operating Temperature: -40°C to +85°C

Applications
- Medical Monitoring in hospitals and clinics
- Fitness Monitoring in smartwatches or fitness trackers
- Wearable Devices like smart shirts or patches
- Research studies on heart rate variability
- Home Health Monitoring
- Educational purposes for teaching cardiac physiology
Pin Connections
Pin Name |
Description |
Usage |
GND |
Power Supply Ground |
Ground |
3.3V |
Power Supply 3.3V |
Power Supply |
OUT (ADC) |
Operational Amplifier Output |
Connect to ADC input for conditioned heart rate signal |
LO- |
Leads Off Comparator Output (-IN electrode disconnected) |
High when -IN disconnected, low when connected |
LO+ |
Leads Off Comparator Output (+IN electrode disconnected) |
High when +IN disconnected, low when connected |
SDN |
Shutdown Control Input |
Drive low to enter low-power shutdown mode |
RA |
RED Biomedical electrode pad RA (input) |
Instrumentation Amplifier Negative Input (Right Arm) |
LA |
YELLOW Biomedical electrode pad LA (input) |
Instrumentation Amplifier Positive Input (Left Arm) |
RL |
GREEN Biomedical electrode pad RL (input) |
Right Leg Drive Output |

Sample Project
Circuit:

Library
No external library is required.
Arduino Code Example
void setup() {
Serial.begin(9600);
pinMode(10, INPUT); // LO+ detection
pinMode(11, INPUT); // LO- detection
}
void loop() {
if((digitalRead(10) == 1) || (digitalRead(11) == 1)) {
Serial.println('!');
} else {
Serial.println(analogRead(A0)); // Heart signal
}
delay(1);
}
After uploading, you can view the heart rate values on the serial monitor or serial plotter. For advanced visualization, the Processing IDE can be used to plot real-time ECG data.

Notes
- This module is not a replacement for professional medical equipment.
- Consult a qualified healthcare provider for any heart health concerns.
- Follow manufacturer guidelines for accurate and safe usage.
References
Features
- AD8232 IC for signal conditioning of cardiac bioelectrical signals
- Low power consumption for battery-operated use
- Single-lead ECG monitoring
- Includes sensor pads to attach to the skin
- Versatile for monitoring various vital signs
- Compact size for integration into wearable devices
- Easy to use with clear instructions
- Cost-effective compared to other medical monitoring devices

Specifications
- Power voltage: DC 3.3V
- Output: Analog
- Interface: RA, LA, RL (3-pin, 2.54mm header or earphone jack)
- Dimensions: 36 x 31 x 18mm
- Operating Temperature: -40°C to +85°C

Applications
- Medical Monitoring in hospitals and clinics
- Fitness Monitoring in smartwatches or fitness trackers
- Wearable Devices like smart shirts or patches
- Research studies on heart rate variability
- Home Health Monitoring
- Educational purposes for teaching cardiac physiology
Pin Connections
Pin Name |
Description |
Usage |
GND |
Power Supply Ground |
Ground |
3.3V |
Power Supply 3.3V |
Power Supply |
OUT (ADC) |
Operational Amplifier Output |
Connect to ADC input for conditioned heart rate signal |
LO- |
Leads Off Comparator Output (-IN electrode disconnected) |
High when -IN disconnected, low when connected |
LO+ |
Leads Off Comparator Output (+IN electrode disconnected) |
High when +IN disconnected, low when connected |
SDN |
Shutdown Control Input |
Drive low to enter low-power shutdown mode |
RA |
RED Biomedical electrode pad RA (input) |
Instrumentation Amplifier Negative Input (Right Arm) |
LA |
YELLOW Biomedical electrode pad LA (input) |
Instrumentation Amplifier Positive Input (Left Arm) |
RL |
GREEN Biomedical electrode pad RL (input) |
Right Leg Drive Output |

Sample Project
Circuit:

Library
No external library is required.
Arduino Code Example
void setup() {
Serial.begin(9600);
pinMode(10, INPUT); // LO+ detection
pinMode(11, INPUT); // LO- detection
}
void loop() {
if((digitalRead(10) == 1) || (digitalRead(11) == 1)) {
Serial.println('!');
} else {
Serial.println(analogRead(A0)); // Heart signal
}
delay(1);
}
After uploading, you can view the heart rate values on the serial monitor or serial plotter. For advanced visualization, the Processing IDE can be used to plot real-time ECG data.

Notes
- This module is not a replacement for professional medical equipment.
- Consult a qualified healthcare provider for any heart health concerns.
- Follow manufacturer guidelines for accurate and safe usage.
References