Infrared proximity sensor made by Sharp. Part # GP2Y0A41SK0F has an analog output that varies from 3.1V at 4cm to 0.3V at 30cm with a supply voltage between 4.5 and 5.5VDC. The sensor has a Japanese Solderless Terminal (JST) Connector. We recommend purchasing the related pigtail below or soldering wires directly to the back of the module.
Documents:

Single Lead Heart Rate Monitor - AD8232 (SparkFun)
Single Male/Male Pin Header (2.54 - 40 Pins)
Body Load Cell (50Kg)
Sensor Cable - Electrode Pads (3 connector) 


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