Giant temperature led display

Discussion in 'The Projects Forum' started by markosillypig, Apr 25, 2014.

  1. markosillypig

    Thread Starter Active Member

    Jul 21, 2008
    184
    0
    hi
    project for this month is to make a large led temperature display.
    making the 8 segment display from led strips photo attached.
    what i would like to know is that I'm using a an Red Digital Thermometer photo attached.
    i am using the outputs from the Red Digital Thermometer to make the larger one's illuminate but they need more power so i need transistors ?
    from the led outputs which are vcc-
    can any one help please


     
  2. Bernard

    AAC Fanatic!

    Aug 7, 2008
    4,172
    397
    Is the light strip 3 LED's in series with a resistor peg segment for operation on 12 V ? Are each letter segment going to be a multiple of 3 LED's ? Yes, a transistor or FET for each letter segment
     
  3. crutschow

    Expert

    Mar 14, 2008
    13,003
    3,232
    Three 7-segment digits would require 21 transistors plus any for the decimal point(s) if they are switchable.
     
  4. markosillypig

    Thread Starter Active Member

    Jul 21, 2008
    184
    0
    what transistors would i be looking at ?
     
  5. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    markosillypig said:
    What? Huh?

    From that description, you expect someone to recommend transistors or MOSFETs suitable to use?

    Why don't you supply more information about the LED strips that you want to use (like current and voltage requirement, and does it have internal current limiting) and what in the world you meant by the quoted text.

    Is your temp display battery powered or does it operate from the mains? What voltages are available? Do you mind using auxiliary power for your LED strips? (it's likely going to take much more power than before).
     
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