Help with a LDR Light Dark Relay. Any electricians here? - Router Forums
 
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post #1 of 6 (permalink) Old 09-03-2008, 05:00 AM Thread Starter
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Exclamation Help with a LDR Light Dark Relay. Any electricians here?

Hey guys!
I have been lurking around still but have not really been into any woodworking projects. I recently bought some LED's and thought they would sell great but i guess not. Awhile back i thought about making my wood address sign with LED's so it could be seen at night.
Here's the old thread.
http://www.routerforums.com/lobby/88...t-up-sign.html

Well now i want to make a new sign in a enclosed box with some type of acrylic and have the numbers on that. Just like the light up one's you see on house's in the neighborhoods. Anywase i have found a LDR which means Light Dark Relay. I want to use this as the sensor. Can someone explain how to use it? I see the positive and negative, those would go to the power source right? So once i wire up the LED's and have the positive and negative where would those wire in? I was also wondering how it senses if it's light or dark? this is a circuit board so it needs to stay out of the weather!

I hope someone can help me here.
Jeff
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post #2 of 6 (permalink) Old 09-03-2008, 07:13 AM
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post #3 of 6 (permalink) Old 09-03-2008, 08:22 AM
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In the schematic shown by Mike, the item labeled photo transistor is commonly known as a Light Dependent Resistor (LDR), as its name implies, it's resistance varies with the amount of light falling on it. With all due respect Jeff. and whilst not wanting to dampen your enthusiasm I have to tell you that you really are out of your depth here. Why not decide on what you really want to do and study that one subject until you thoroughly understand that subject before going on to something else.

Harry



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post #4 of 6 (permalink) Old 09-03-2008, 07:15 PM Thread Starter
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Thank you Mike and thank you Harry for explaining to me.
Harry
Like you know i want to make a light up street sign for my home and for a few family members. I have been looking at what i want to use and have found this LDR which seems like it will suit my needs. I have a uncle who is an electrician so i can get help if i need it. I did think i was getting in over my head but hey i'll make it through.
Jeff
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post #5 of 6 (permalink) Old 09-03-2008, 10:56 PM
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"but hey i'll make it through."

I'm sure you will Jeff., good luck.

Harry



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post #6 of 6 (permalink) Old 09-04-2008, 12:50 AM Thread Starter
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It's so amazing how much you can tell about a person in typing!
Harry.
Everyone tells me that i have a "Go for it attitude" My great grandmother always told me that she thought i would succeed in life and be wealthy. I definitly want to make great money and possibly have a awesome workshop later in life. However i think it would be a total loss of a awesome succeeding person if i do not make it to succeed in life. I have always been trying new stuff to experiment and see where to go in life. You definitely have a great idea of the type of person i am harry.
Jeff
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