ECG and PPG heart rate monitors for OpenBCI

The OpenBCI shop sells the Pulse Sensor Heart-Rate Monitor: There are also other heart rate monitors available, as for instance the Analog Heart Rate Monitor Sensor (ECG) For Arduino from DFROBOT: https://www.dfrobot.com/product-1510.html The DFROBOT ECG sensor is for Arduino. But if we are a little bit skilled, we think it is possible to connect this …