Light-Sensitive Night Light

Title says it all - a night light which is sensitive to light.

Simply using an LDR would make it light up when there was light and go off in the dark - pointless.

So here is how to make one that works the other way round.

Enjoy!

NOTE: In the pictures, the ambient light hasn't shown up as different very well, but trust me, it's lighter when the LED is darker and vice versa.

Step 1 You Will Need:

- Breadboard (Just for the layout, you can eliminate this if necessary)
- LED(s)
- Appropriate resistor(s)
- 10k resistor
- LDR
- Transistor
- 2x Short piece of wire that works with breadboard (Obvious lack of requirement if you eliminate the breadboard itself)
- Appropriate battery(/ies)

Comments

[keithosmarferrer]

i have a quick question, can i change the LED into a motor?

[H4ZZ498]

I don't see why not... You would need to use a battery strong enough

[mariollop]

does it matter if its a pnp or a snp transistor?, i did the hook up w/ supply voltage 2 aa batt. 1.5 each and does the size of the eldr matter?

[H4ZZ498]

I haven't heard of an snp transistor....

As far as I know the size doesn't matter, but the one I used was about 4x5mm

[mariollop]

thanks for the response , i meant npn .

[H4ZZ498]

I don't honestly know the difference between the two.

Sorry for being useless >.<
I'm just a beginner in electronics really...

Thanks for checking out my 'ible though :-)