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@JeonLab
That's interesting to be able to double the voltage. I will take a look. But I still want another extra pin(s) for additional switches, so I will see if I can find any other unused pins.
@Gordon, I have asked this question before, but if there is a schematic available, it would be easy to trace/find an extra pin. If the schematic is not available for public, can you tell me at least how many layers in the PCB? If it's just 2 layers (top and bottom), I may be able to trace those test points.
Since I'm not going to use the HRM, I guess I can use some of those pins like HRM_INT, HRM_SDA or HRM_SCL from the connector. Can I get the pinouts of the HRM header?
Thanks!