Hooking up a Nano Wifi to a USB to Serial Chip

Discussion in 'General Electronics Chat' started by AgentSmithers, Jan 25, 2011.

  1. AgentSmithers

    Thread Starter Well-Known Member

    Jan 14, 2011
    Okay Hi everyone!

    First off thank you for everyone making me feel welcome as I head on my way to becoming a Guru at circuits! =)

    So far I have a Breadboard with this chip, It is a USB to Serial Device found here ( http://guides.machinescience.org/mod/book/view.php?id=974 ) that lets me send RAW LLC Serial out the TX and RX pins on the device and I am hooking it up directly to this device


    I believe the USB to Serial is pumping 5V 500MA and I need it bring it down to 3.3V and some amount of Milliamps but I do not see it in the PDF, can any of you point out what resistor I should use to bring the V and MA down so I don't fry my chip. Thanks!

    My Guess is
    5V Voltage Source
    3.3 diode forward voltage
    250MA diode forward current (mA)

    And the result I get is this..

    The wizard recommends a 1W or greater 8.2 ohm resistor. The color code for 8.2 ohms is grey red gold.

    Thanks for your help!!!
  2. beenthere

    Retired Moderator

    Apr 20, 2004
  3. AgentSmithers

    Thread Starter Well-Known Member

    Jan 14, 2011
  4. thatoneguy

    AAC Fanatic!

    Feb 19, 2009
    Packaging, Surface mount varietes and a TO-220 option is there for prototype work with solderless breadboard. You can click on the package name, ex. TO-263 in that list to see what the layout and dimensions are.

    The ES and ET extensions are extended temperature range (-40° - +125° C) devices in the same package. The IMP versions are the standard temperature (-40° - +85°C) range.