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SD card vs the USB stick — Parallax Forums

SD card vs the USB stick

CrazyrabbitCrazyrabbit Posts: 116
edited 2011-04-26 10:43 in Propeller 1
I was wondering which would be better. I know the SD card is cheaper, but uses more IO. Can you write and run prop or stamp codes on either? I just finished my Propeller RPM board for easy plug and play operation. I added a 5V regulator and a header strip with series resisor for 5V sensors. It also has a female header for rhe header strip. It has another male header row on the bottom for all the IO pins. This is plugged into a small breadboard (not visable) which in turn can be easily wired to a bigger breadboard. I went with the RPM because the memory and propeller chips can easily be removed. I already fried one. lol This will be the newist platform I am added to my Heavy Duty 3 servo robotic platform above the BS2 super carrier board platform. I am waiting for my X Bee experimenters package to arrive. You can see my robot on the Parallax robotics page.

IMG_5438.jpg
IMG_5438.jpg
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Comments

  • Mike GreenMike Green Posts: 23,101
    edited 2011-04-26 08:19
    An SD card is easier to use and cheaper than a USB memory stick. There are only 4 I/O pins needed. There are several different I/O drivers available. Kye's is the most complete functionally, but takes the most memory. Rokicki's FSRW doesn't handle subdirectories, but takes less memory and is more widely used since it's been around longer. Both are easy to use.
  • CrazyrabbitCrazyrabbit Posts: 116
    edited 2011-04-26 09:46
    What about the Parallax USB adaptor? Is it easy? I would think Parallax has alot of support. Just curious. I may go with The Sd per your imformation. Thanks again for your support.
  • Mike GreenMike Green Posts: 23,101
    edited 2011-04-26 10:33
    The Parallax Memory Stick Datalogger is a nice device based on the Vinculum chip. It is easy to use, but you can only have one file open at a time and it is more expensive, physically larger, and takes more power than an SD card socket.
  • RobotWorkshopRobotWorkshop Posts: 2,307
    edited 2011-04-26 10:43
    Which Parallax USB adapter, can you be more specific?? There are all sorts of USB adapters. Is this the one you were looking at?

    http://www.parallax.com/StoreSearchResults/tabid/768/txtSearch/usb/List/0/SortField/4/catpageindex/3/ProductID/434/Default.aspx

    The SD card interface only uses 4 pins for the connection to the Propeller. It seems to be the standard for file storage for many Propeller projects and is well supported. I don't see where trying to go the USB route would save you that many pins. If you are running out of pins there are proably other ways to save them.

    A great way to save pins is by using 74HC595 chips for outputs and 74HC165 chips for inputs. Three pins can get a large number of inputs/outputs that way. I'm using a set of four 74HC595's to control 32-LED's for lighting and relay control. Only takes three Prop pins.

    Robert
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