AD8232 heart rate monitor - Sparkfun

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The AD8232 is a heart rate monitor module from the manufacturer Sparkfun. It is a much cheaper alternative to medical equipment, allowing the measurement of the heart's electrical activity. It does this in a similar way to an electrocardiogram, sending a filtered analog signal to the output connection. Since EKG signals are very weak, the module has a built-in amplifier that allows these signals to be distinguished from the background. The signals are also filtered by a special filter that further reduces the impact of background noise on the data. The desired connection wires can be firmly soldered to the main board's solder pads SDN, LO+, LO-, OUTPUT, 3.3V, and GND, and the module also has additional pads for reading limb measurement readings (RA (Right Arm), LA (Left Arm), RL (Right Leg)) from additional sensors that you wish to use.

Note: To use the module, biomedical stickers-electrodes and wires for muscle signal stickers are required, which are not included in the kit. The product is not intended for medical use, only for amateur exploration.

Specifications
●    Supply and logic signal voltage: 3.3V DC
●    Signal type: analog.
●    LED indicators show the measured heart rate
●    Measurement wire connection: 3.5 mm

Applications and references:
●    Measurement of heart signals
● User manual
● Connection guide
● Video review