Freematics Forum

I figured out that the I/O pins are actually the solder points next to the LED. Can the RXD/TXD pins be used as regular digital inputs?

I recently purchased a FreematicsOne/Trackie unit and I am having trouble figuring out how to use the external I/O pins. I would like to add some custom sensors to the unit. I read here that "Two I/O pins (PC0, PC1 or A0, A1 in Arduino context) are led out to one corner of PCB. They can be used...