TS-Chris:
You'd probably want to use a FTDI like the our [[DEV-09716](https://www.sparkfun.com/products/9716), but you're going to need some sort of external power in addition to the FTDI. Another option would be to connect an Arduino Uno to the M6E Nano and have that talk to the M6E and just pass data onto your Pi for processing.
- What would the physicall connections be between the RFID kit and pi?
There are none supported by SparkFun and we are not aware of how to modify the existing API for use on the Pi. It might be possible but sadly we can't support it. [/quote]
What modifications I need to do in SparkFun UHF Reader API?
Is there any API available C/C++ or Python in which I could control the RID kit with the PI board?
How to interface Pi with arduino RedBoard? Connect both with the USB cable simple and write a handling serial function for it? Any other extra HW required, I assume there voltage levels are the same since its a usb interface.
Usb mini-B on red board to USB 3.0 or 2.0 port on pi 4? just need a cable mini-b on one end and regular on other?
UART of Redboard to UART on pi4? Would the voltage levels be the same in this case pi GPIO can only withstand 3.3V not sure what is the limit of sink current.](https://www.sparkfun.com/products/9716)
Please look into the following resources: