From blinking led to not blinking

Discussion in 'The Projects Forum' started by susannah, May 12, 2014.

  1. susannah

    Thread Starter Active Member

    Feb 14, 2010
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    0
    I have coin battery powered circuit which has led blinking.

    I would like to stop that blinking and keep led on.

    How i can do that? Thanks
     
  2. MrChips

    Moderator

    Oct 2, 2009
    12,447
    3,363
    Connect the LED to the battery via a resistor.
     
  3. djsfantasi

    AAC Fanatic!

    Apr 11, 2010
    2,810
    834
    Is this a pre-made circuit or one you made? I expect the former. In that case, there is likely a black blob somewhere, which is a custom circuit to make the LED blink.

    You can't change this without rewiring the whole thing.

    It could be a custom LED that blinks. You can't change this.

    A circuit to light an LED off a coin battery is as simple as a battery and holder, a current limiting resistor and a LED. Some circuits omit the resistor, as the batteries internal resistance is sufficient, as long as the Vf matches the battery rating.

    We need more information regarding your circuit to be more specific.
     
    susannah likes this.
  4. susannah

    Thread Starter Active Member

    Feb 14, 2010
    87
    0
    Thanks.

    It's this:
    H2OhNo! ATtiny Dev Board / Water Alarm
    https://www.sparkfun.com/products/12069

    It can be probably possible using programming, but i can't do that.

    What kind of components i should connect between legs of that blinking led and my own led so my own led is not blinking?
     
  5. MrChips

    Moderator

    Oct 2, 2009
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    Building an LED water sensor is not difficult even for someone with no knowledge of electronics. All that is required is a transistor and some resistors.
     
  6. djsfantasi

    AAC Fanatic!

    Apr 11, 2010
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    The LED on the board is controlled by the ATTiny-85 microcontroller. Hence, it is not as easy to convert.

    Off the top of my head, you could use the signal into the LED to drive a separate retriggerable monostable multivibrator circuit whose on time is longer than the LED blink rate.

    Anyone else?

    Edit: what MrChips said. Designing a water sensor is easier than modifyng the Sparkfun one.
     
    Last edited: May 12, 2014
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