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TCRT1000 - Reflective Optical Sensor
Manufactured by Vishay Semiconductors
I ordered it from Mouser
For more information, visit: Sensor Report – Reflective Optical Sensor TCRT1000

Although I am not convinced by the code they are using or the schematic, my schematic is working. This is probably NOT the most reliable pulse reader, but since I am not looking for high fidelity in my project, this will do just fine.

For a more accurate DIY HRV sensor, check out Collin's Lab Infrared Heart Sensor

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