Using Arduino Pro Mini instead of Arduino Uno
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ktgrhsd commented
The code provided works fine with Arduino Uno. The Heart Rate and Oxygen Saturation values match to that of a medical grade device (personally verified this).
I replaced Uno with Pro mini and I am getting "Initializing Pulse Oximeter...Failed" message. I tried 1k ohm pull ups instead of 2.2k ohm resistors, even this didn't work. Also tried 1k ohm resistor instead of 4.7k ohm resistor on the INT pin.