dav7

Member Since: May 22, 2009

Country: United States

  • Tutorial - Ethernet to Color LED Matrix | about 5 years ago

    Probably not too hard, but the only WiFi module I see (this one: http://www.sparkfun.com/commerce/product_info.php?products_id=8869) is $70 so it’d be a bit of an investment. All the same, it uses serial which is insanely easy to make use of - take a look at the following tutorial page (http://www.sparkfun.com/commerce/tutorial_info.php?tutorials_id=49) for more info. It uses Bluetooth as opposed to wifi but the module used there is serial as well so you get an idea of how easy it would probably be.

  • Product WRL-00151 | about 5 years ago

    This module has a FIFO (first in first out) buffer that you can fill with data at any rate (so you don’t need a fast microcontroller), then you set a transmit bit and it sends it out at 250kbps or 1Mbps depending on how you’ve configured it.
    Page 21 in the RF-24G PDF above lists the following as the payload size:
    - In Shock-Burst mode payload size is 256 bits minus the following: (Address: 8 to 40 bits. + CRC 8 or 16 bits).
    - In Direct mode the payload size is defined by 1Mbps for 4ms: 4000 bits minus the following: (Preamble: 8 (or 4) bits. + Address: 8 to 40 bits. + CRC: 0, 8 or 16 bits).
    So unless I’m wrong, you at worst have 200 bits - ie 25 bytes - to work with. The whole transmission itself is a bit bigger - the payload is just one of 4 “pieces” of a transmission (which are all mentioned in the PDF).
    If I’m wrong, please do correct me! Also, listing the buffer size in the specs would probably be very convenient ;)

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