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Looking to wire an LED light indicator for my garage door. I'm in no way a lighting/electrical expert and I could use help. I do repair copiers for a living. Home auto mechanic rebuild motors etc. I have replace the entire house with new receptacles. I am a tech and work on electrical things here and there.

Here is what I need help on. I am wiring a sensor so that when the garage door opens a Led light will come on in the house to let me know that its open.

This is what I have:

  1. Transformer/ power supply input 100-24v,output 9v-500mA
  2. 3mm Pre-wired LED Red Emitting Diode DC 9-12V 620-630nm Voltage(V) 20ma
  3. Door Contact Magnetic Reed Switch closed. Max. Current: 0.5A Max. Voltage: 100V DC Max. Power: 10W
  4. 40 feet of wire

Do I need any resistor for this? or will it work fine with out it?

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  • 2
    Can you post a circuit drawing? – gatorback Jan 13 at 4:54
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    It looks like there is a resistor under the heat shrink tubing. If you wire it up directly to the transformer does it light up or blow out? (I'm thinking it'll blow out). They're cheap. – Steve Wellens Jan 13 at 15:50
  • I have not receive it yet. I have the power supply so far – Candy Brush Jan 13 at 16:08
  • This is all the info on this led I have at the moment. Red Pre-wired Diffused LED: DC 9-12V 620-630nm I think the last few numbers are Dominant Wavelength – Candy Brush Jan 13 at 16:27
  • I just fount out the resister is It's 470ohm. – Candy Brush Jan 14 at 4:55
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If you use a plain LED, you would need a current limiting resistor. However if you use an LED panel mount pilot light, it will be as simple as drilling a hole in a faceplate and hooking up the leads.

  • Not sure if that is a resister in there already. I'm asking supplier – Candy Brush Jan 13 at 15:48
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    I see you added a picture, that sure looks like a resistor in the shrink tubing on that pre-wired LED. Still for just a couple bucks it might be worth buying a pilot light so it's easy to mount. – batsplatsterson Jan 13 at 23:38
  • No room for a pilot light. Just enough for the led. – Candy Brush Jan 14 at 5:25
  • Anyone have any Ideas on this? – Candy Brush Jan 16 at 15:46

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