Resistor value recognizer

Discussion in 'General Electronics Chat' started by alexstr, Feb 5, 2013.

  1. alexstr

    Thread Starter New Member

    Feb 5, 2013
    4
    1
    Hi all,

    I'm a beginner in electronics, playing with simple circuits. When I want to know the value of a resistor I use a multimeter. I thought it can be cool to have an app for a phone that can use its camera to recognize resistor color coding. I've checked the iPhone AppStore but all apps that I found require you to specify colors by hand.

    Does anybody know about such an app for iPhone or Android?
     
  2. PackratKing

    Well-Known Member

    Jul 13, 2008
    850
    215
    Aw c'mon...Gimmee a break...!!!
    It doesn't take that much effort to memorize the color code.....:rolleyes:
     
  3. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
    4,769
    969
    "ElectroDroid" for android (prob an icrap version too)
    its got
    Resistor color code
    SMD resistor codes
    Inductor color codes
    Ohms law calculator
    reactance/resonance calculator
    rc/lc/rl filter calc
    voltage divider calc
    resistor ratio/series/parallel calc
    capacitor charge
    op amp crkt designer
    led resistor calc
    voltage reg calc
    555 timer calc
    power dissipation calc
    battery life calc
    inductor design tool
    voltage drop calc
    pcb trace width calc
    decibel/freq/ad converter

    plus common connector pinouts, ampacity tables/micro cross ref,etc..


    and its FREE

    Its like having a nerdy EE in my pocket.
     
  4. #12

    Expert

    Nov 30, 2010
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    For a moment, I thought you were going to write the app. Beginners might use it as a crutch, for a while, but the truth is, you soon get good enough to read a resistor as fast as you can read English.

    Still, it's a money making idea if you can write the app.

    Edit: mcgyver just shot holes in my theory.
     
  5. crutschow

    Expert

    Mar 14, 2008
    12,973
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    There's a list of mnemonics here (some not so politically correct) to help remember the color code.
     
  6. alexstr

    Thread Starter New Member

    Feb 5, 2013
    4
    1
    PackratKing, I suppose you are right, but still, sometimes I have difficulty to tell a red band from a brown one on a resistor.

    mcgyver, thanks for the reference, but "ElectroDroid" does exactly what all iPhone apps do: it asks you to choose the colors from the menu. I want to "show" a resistor to the phone's camera and read its value on the screen, or better yet, the phone will spell it to me with a nice girl voice:)

    #12, there is a pro version of the app mentioned by mcgyver, so maybe it's still a good idea for the app.
     
    PackratKing likes this.
  7. takao21203

    Distinguished Member

    Apr 28, 2012
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    I am tempted to stress that this is really originally wikiPedia.

    wikiPedia is more a pronounciation assistance than anything.

    Read wikiPEdia
     
  8. alexstr

    Thread Starter New Member

    Feb 5, 2013
    4
    1
    Thanks!!! The least politically correct is one I'll remember:)
     
  9. takao21203

    Distinguished Member

    Apr 28, 2012
    3,577
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    Hmm. I simply use one and the same value for all resistors if any possible. Often this is 2.2 KOhms. Also SMD resistors have a numerical code imprinted.

    But yes I can read them actually.

    For the metal film resistors, I do not usually try, as the contrast is often bad. Metal film for instance is used for 1W resistors. I always use a multimeter, or take them from a bag.
     
  10. #12

    Expert

    Nov 30, 2010
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    True. The last resort is an ohm meter, but it always works.
     
  11. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
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    and so would a camera vision app.. ;)
     
    #12 likes this.
  12. alexstr

    Thread Starter New Member

    Feb 5, 2013
    4
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    ;)
    Or maybe not. It will be interesting to check.
     
  13. #12

    Expert

    Nov 30, 2010
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    Please report back here when you find out.
     
  14. crutschow

    Expert

    Mar 14, 2008
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    Do you perhaps have some degree of color blindness? Have you ever taken a color blindness test?
     
  15. #12

    Expert

    Nov 30, 2010
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    I don't have any vision defects and I've seen red turn to more like brown from heat.
     
  16. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
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    Have you ever seen an old resistor before :p
     
  17. thatoneguy

    AAC Fanatic!

    Feb 19, 2009
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    Metalmann likes this.
  18. spinnaker

    AAC Fanatic!

    Oct 29, 2009
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    Bad boys rush our young girls but Violet gives willingly.


    But I am with the OP, I would rather use a calculator. My brain is too old. :)

    Not a mobile app but Electronics Assistant is pretty good.
     
  19. sheldons

    Active Member

    Oct 26, 2011
    616
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    how are you with reading the 4 band color code and the 5 band color code on a resistor?or the old body-tip-dot system on the older resistors? it takes me seconds to see by the colors on the resistor what value it is but if you are in any doubt a meter will tell you all you need to know
     
  20. thatoneguy

    AAC Fanatic!

    Feb 19, 2009
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    Pretty much, until you get to burnt resistors where all the colors fade to brown/black/dark grey shades.

    If a Video DSP App that can decode "burnt colors" gets produced, it would sell like hotcakes! :eek:
     
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