SEN0203 Heart Rate Sensor Schematic

Account cancelled 2017-10-07 15:21:31 1190 Views0 Replies
Hi everyone,

Can someone help me by explaining to me what exactly is the function of the four SON3130 in this schematic?
Any help would be much appreciated.

https://github.com/DFRobot/DFRobot_Hear ... ematic.pdf