can i power both the rfid module and the iot redboard externally with two separate power supplies? If not, how can i do it?
Certainly - just make sure it is within the notes’ spec Basic Assembly - SparkFun Simultaneous RFID Reader - M7E Hookup Guide
I have an external 5v 2a power supply, can I use it to power both via the Vin pins of both the micro and the module? Are you sure that the necessary current (750 mA) can be transported from the Vin pin of the micro (as shown in the figure) for efficient performance?