AD8232 ECG-Electrode Module

The AD8232 ECG Electrode Module is a compact, low-power analog front-end module designed to measure the electrical activity of the human heart (Electrocardiogram - ECG). Built around the Analog Devices AD8232 integrated circuit, it amplifies, filters, and conditions weak biopotential signals from the body, making them suitable for direct acquisition by microcontrollers such as Arduino, ESP32, ESP8266, STM32, Raspberry Pi Pico, and other development boards.

The module uses three disposable ECG electrodes connected to the Right Arm (RA), Left Arm (LA), and Right Leg (RL) to capture a single-lead ECG signal. It also features lead-off detection outputs that notify the microcontroller if an electrode becomes disconnected, improving measurement reliability.

• IC: AD8232 Single-Lead ECG Analog Front-End
• Operating Voltage: 3.3V DC
• Typical Supply Current: 170µA
• ECG Configuration: Single Lead (2 or 3 Electrode)
• Output Type: Analog ECG Signal
• Analog Output Voltage: Approximately 0V to 3.3V (centered around reference voltage)
• Lead-Off Detection Outputs: LO+, LO-
• Shutdown Control Pin: SDN
• Electrode Connections:
  • RA (Right Arm)
  • LA (Left Arm)
  • RL (Right Leg / Reference)
• ECG Electrode Connector: 3.5mm TRS Jack
• Internal Features:
  • Instrumentation Amplifier
  • High-Pass Filter
  • Low-Pass Filter
  • Fast Restore Circuit
  • Right Leg Drive (RLD) Amplifier
  • Integrated Reference Buffer