From Makers Electronics's description
Heart Rate Monitor AD8232 The AD8232 Single Lead Heart Rate Monitor is a cost-effective board used to measure the electrical activity of the heart. This electrical activity can be charted as an ECG or Electrocardiogram and output as an analog reading. ECGs can be extremely noisy, the AD8232 Single Lead Heart Rate Monitor acts as an op amp to help obtain a clear signal from the PR and QT Intervals easily. The AD8232 is an integrated signal conditioning block for ECG and other biopotential measurement applications. It is designed to extract, amplify, and filter small biopotential signals in the presence of noisy conditions, such as those created by motion or remote electrode placement. The AD8232 Heart Rate Monitor breaks out nine connections from the IC that you can solder pins, wires, or other connectors to. SDN, LO+, LO-, OUTPUT, 3.3V, GND provide essential pins for operating this monitor with an Arduino or other development board. Also provided on this board are RA (Right Arm), LA (Left Arm), and RL (Right Leg) pins to attach and use your own custom sensors. Additionally, there is an LED indicator light that will pulsate to the rhythm of a heart beat. Biomedical Sensor Pads and Sensor Cable are required to use the heart monitor Note: This product is NOT a medical device and is not intended to be used as such or as an accessory to such nor diagnose or treat any conditions Pin Description of the AD8232 ECG Module Pin Name Description GND Power Supply Ground 3.3v Power Supply 3.3v Output (ADC) Operational Amplifier Output. The fully conditioned heart rate signal is present at this output. OUT can be connected to the input of an ADC. LO- Leads Off Comparator Output. In dc leads off detection mode, LO− is high when the electrode to −IN is disconnected, and it is low when connected LO+ Leads Off Comparator Output. In dc leads off detection mode, LOD+ is high when the +IN electrode is disconnected, and it is low when connected Shutdown Control Input. Drive SDN low to enter the low power shutdown mode. RA (Right Arm) RED Biomedical electrode pad RA(input). Instrumentation Amplifier Negative Input. −IN is typically connected to the right arm (RA) electrode LA (Left Arm) YELLOW Biomedical electrode pad LA(input). Instrumentation Amplifier Positive Input. +IN is typically connected to the left arm (LA) electrode RL(Right Leg) GREEN Biomedical electrode pad RL(input). Right Leg Drive Output. Connect the driven electrode (typically, right leg) to the RLD pin. 3.5mm ECG Biomedical Electrode Connector Jack Combine Biomedical Electrode pad Connector of RA, LA, RL The pinout can be easily seen in the Board Legend. An example of the arrangement of the electrodes on the body. Features of the AD8232 ECG Module Fully integrated single-lead ECG front end Common-mode rejection ratio: 80 dB (dc to 60 Hz) Two or three-electrode configurations Qualified for automotive application Single-supply operation: 2.0 V to 3.5 Fast restore feature improves filter settling Size: 3.5cm x 2.8cm Useful links Datasheet (AD8232) GitHub (Design Files & Example Code) Package Includes: 1 x Ecg module AD8232 heart ECG monitoring sensor module. Sensor Cable – Electrode Pads (3 Connector) 3 x Electrode Pads.
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