Grove - Ear-clip Heart Rate Sensor (SKU: 101020033)
A1: Yes,Grove Ear clip heart rate sensor can be used with arduino mega 2560.
Make the following connections directly from the Mega board to Ear Clip Heart Rate Sensor.
* Connect the Yellow/Signal pin of the grove to D2 pin of the Arduino.
* Red wire pin to 5v/3.3v.
* Black wire pin to GND.