I'm a university student attempting to make a wall-mounted RFID reader using a Raspberry Pi device and a Parallax RFID reader. I'm still in the process of planning and ordering the components, and thus my questions has to do with the option between a Serial or a USB connection to my Raspberry Pi.
The RFID Card Reader USB uses a USB connection to the Raspberry Pi and obtains its power through the USB socket.
The RFID Card Reader Serial uses a serial connection at 2400 baud (8N1). A batter will be used to power it.
- Can the Raspberry Pi power a 5V device through its USB socket?
- And if this is not a problem, would you recommend using a USB enabled device, or a serial connected one instead?
Here is the documentation for both RFID readers in case anyone needs additional information.