Introduction: DIY Dark Sensor

Picture of DIY Dark Sensor

Hello guyz

Here is another instructable of making a cheap dark sensor from scratch!

Its Cheap and works fine.

No requirement of arduino or Ic's.

Step 1: Items Required

So, For making this basic sensor , you will be required some basic items which can be easily purchased from a local electronics shop for some bucks.

Here are the parts which are required :-

1. 1 X BC547 ( Very Common Transistor)

2. 1 X 5mm LED

3. 1 X 220k Ohm Resistor

4. 1 X 330 Ohm Resistor

5. 1 X LDR (Light Dependent Resistor)

6. Soldering Items and a perfboard

7. Couple of wires

Step 2: Circuit Diagram

Picture of Circuit Diagram

Just follow the circuit diagram and you will get your Dark Sensor ready at no time!


John_Singleton_ (author)2016-02-21

Are the resistors necessary if you are using a low power supply

AlexanderJ2 (author)2015-12-15

Hi, nice project, but I have one question, how can I connect multuple leds on this circut? I want to make a small Christmas-like village with lights in and out of houses (street lights) and I want them all light up when it is dark... Is it possible?
I want to use 12V power supply. Can I somehow connect all LEDs paralel, and then connect them as one in this circut? And which resistors should I use?
Thank you

Arman5592 (author)2014-09-17

I think there's a problem , it does not work !

rpotts2 (author)Arman55922014-09-26

flip the LED around. if that doesn't work flip the transistor around. the are 4 possible orientations between the two.

Arman5592 (author)2014-09-17

I think there's a problem , it does not work !

Tater Zoid (author)2014-09-16

Hi, what is a dark sensor used for?

Rodville (author)Tater Zoid2014-09-16

To tell you when it's dark.

Tater Zoid (author)Rodville2014-09-16

Dang, I was hoping for something entirely different.

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