2 NB2023 Pulse sensor modules with optical heart rate sensor Use this practical module to carry out heart rate measurements with Arduino or other microcontrollers. Example source codes can be found on GitHub. Opened but never used as project was shelved! Also selling lots of other components, Raspberry Pis, Hats, Microbits and kits so please look at other listings as happy to do a discount on multiple purchases!
eBay