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Propplug and Raspberry Pi — Parallax Forums

Propplug and Raspberry Pi

Heater.Heater. Posts: 21,230
edited 2012-07-30 04:55 in Propeller 1
This is only slightly Propeller related but a PropPlug makes an excellent USB-Serial adapter for the Raspberry Pi board.
Just make a little adapter cable to connect the Prop Plug to the Pi UART on its GPIO header.

Pi GND -> propplug VSS
pi Tx -> propplug Rx
pi Rx -> propplug Tx

Note the crossover.

I put some little resistors in the Tx/Rx lines to protect from my dodgey wiring but they are not needed.

Comments

  • TonyDTonyD Posts: 210
    edited 2012-07-30 02:49
    Yes, I did the same thing when I first got my Raspberry Pi. I was going to use a Arduino with it's FTDI chip as a USB-serial straight through but then I remembered the PropPlug.
  • LeonLeon Posts: 7,620
    edited 2012-07-30 04:08
    There are also those very cheap UART to USB converters on Ebay using a PL2303. I've got one, but haven't tried it with my Pi.
  • Heater.Heater. Posts: 21,230
    edited 2012-07-30 04:49
    Leon,
    Yep, I think it's time I had a bunch of them. Except we don't want RS232 levels only 3.3 volts.
    PropPlug is what comes to hand here but as it's over half the price of a Pi it does not make sense to buy one for that purpose.
  • LeonLeon Posts: 7,620
    edited 2012-07-30 04:55
    I was wrong about the CP2103, I checked the chip on it and they use the cheaper Prolific PL2303. Some people seem to have problems with them, but it worked OK for me connected to a PIC.

    Logic levels are 3.3V according to the Prolific web site, and the RxD input is 5V-compatible. It has a 5V output, connected directly to the USB supply, which might be useful.

    The PCB was marked with the maker's web address: http://www.lcsoft.net

    and here is the relevant web page:

    http://www.lctech-inc.com/Hardware/Detail.aspx?id=eab238b1-ad9c-4f8c-b117-d849887ca5e9

    They seem to make several of the low-cost boards that are available from lots of Ebay suppliers, including the Cyclone II FPGA board I have.
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