LED Timer Circuit not detailed/vague

Discussion in 'The Projects Forum' started by Ayomide Bamidele, Jan 26, 2016.

  1. Ayomide Bamidele

    Thread Starter New Member

    Jan 26, 2016
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    Okay so for my GCSE D&T project I will be making a toothbrush holder, with a built in timer. Slightly boring, I know but it's very doable (at least that's what I thought) and I haven't seen something that looks remotely like my project.
    I want to make a circuit that will keep an LED on for 2 minutes on the push of a button. I found a circuit online:
    http://www.circuitdb.com/?p=401
    [​IMG]
    Unfortunately, on the webpage the circuit maker was very vague about the definitions of the symbols. Granted, it is quite old (2008). I am not sure what 'T1' and 'T2' are for certain -- could you guys help me with this?

    Also, is there a better way of doing this? I've seen the number 555 a lot in google searching circuits like these, what is it? Lastly, If I wanted the LED to change colour from it's original colour for 2 minutes the change back - would I need an Arduino?
     
  2. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    T1 and T2 are transistors. Since this is a school assignment, I suggest you research transistor types and select suitable ones.
    Google will give you plenty of examples of '555 timer circuits'.
     
  3. Ayomide Bamidele

    Thread Starter New Member

    Jan 26, 2016
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    If I invested time in learning Arduino could the thing I'm trying to do be done easier?
     
  4. Dodgydave

    Distinguished Member

    Jun 22, 2012
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  5. ian field

    Distinguished Member

    Oct 27, 2012
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    Might be better to go for the CMOS 555 - looks like an on/off switch as well as the push button would be rather inconvenient.
     
  6. sailorjoe

    Member

    Jun 4, 2013
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    2008 is quite old!!! OMG, I must be positively Jurasic!
     
  7. harikanaidu

    Member

    Nov 28, 2014
    76
    1
    Hi,Iam also working on the same project..I found this link useful..they described three circuits ,two circuits with 555 timer and one with arduino.http://www.electronicshub.org/adjustable-timer/...I have done my project using first circuit...This is very simple circuit and is of low cost..Instead of relay use a led at the output pin for your application.....A calculation is also given ,using that adjust the pot for two minutes....

    if u did not understand that first circuit...check the third circuit with arduino ..this is really very simple..I have not used second one..
     
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