Automatic White LED Lamp

Automatic LED lamp

I assume that you are already familiar with automatic emergency lights or street lights that will automatically turn on when the sun sets and will turn off automatically when the sun rises,those circuits all work with a special kind of resistor called LDR(Light dependant resistor)

the LDR’s resistance will be changed according to the amount of light falls on it, for example: its resistance is high around 1M (1 mega ohm=1000K) in darkness and about 5K in daylight! So using this tiny ‘thing’ we can design and build a plenty of useful circuits (eg:laser alarm,infrared alarm,morning alarm and many!).

The circuit
here is a simple circuit using IC NE555, the circuit will turn on a pair of white LEDs whenever the darkness falls on the atmosphere, the R1 is a variable resistor to adjust sensitivity of the circuit. For the ease of use this circuit can be operated using four 1.5V batteries = 6V so it will become a portable emergency light!

circuit diagram

Components you need

R1 – 100K variable resistor

R2 – 100E

LED – White LEDs(maximum 7)

IC1 – NE555

LD1 – Common LDR

6V battery

Note: a 10V/100uf capacitor with correct polarity may be added between ‘+’ and ‘-‘ to reduce ripple and a 100n(104) capacitor on the pin5 Of 555 for a stable operation(only if needed),

Designed and tested by: Loneziddik

For any help and support, leave a comment below


About Ztronn

hellooo i'm lsid ,i am a DIY (do it yourself) stuff loving kinda guy, i mean i love to build things and posting it on my blogs for the world to see. i love reading about technology and innovation. i love the nature,mysteries of space and of course God. no aliens. kindly let me know what you think about my simple innovations in the comments.
This entry was posted in 555 Timer, DIY-electronics, LEDs, white LEDs (lighting) and tagged , . Bookmark the permalink.

2 Responses to Automatic White LED Lamp

  1. loneziddik says:

    Cool, i appreciate ur comment, keep visiting

  2. humidistat says:

    I’m truly enjoying the design and layout of your site. It’s a very easy on the eyes which makes it much more pleasant for me to come here and visit more often. Did you hire out a designer to create your theme? Fantastic work! humidistat

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