Simple Mini Dusk to Dawn Switch for 220v AC

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Introduction: Simple Mini Dusk to Dawn Switch for 220v AC

At or farms, we required to install a few lights that would

automatically turn on at night and turn off at dawn and since we required quite a few, it had to be cost effective and efficient. I thought about installing a timer switch at first but gave up on the idea. Finally after searching through numerous circuits the internet, I figured that an effective, small and cheap circuit could be designed with ease. The entire switch costs under 50 cents (Rupees 31/- in India). I extend my heartfelt thanks and gratitude to all the contributors of the many designs and circuits on the internet from where I have drawn the inspiration, the names of the contributors I do not individually know but my thanks to all.

Step 1: Parts List & Diagram

Parts Required Cost

1” x 1” Strip Board Rs.2/-

1 x BT136 or BTA12 Triac Rs.12/-

1 x DB3 Diac Re.1/-

1 x 1w. 100K Resistor Re.1/-

5mm LDR Rs.10/-

Assorted Wires for wiring Rs.2/-

Old Plastic Film Canister Rs.0/-

Total Parts Cost Rs.28/-

TOOLS

Soldering Iron

Solder Wire

Wire Strippers

Glue Gun

Assorted Small Tools

WARNING

The circuit works on 220v AC and if you are not accustomed to working with mains voltage or do not have ample experience in working with 220v AC Mains Voltage please stay away from this project.

I assume no responsibility for any loss or damage arising directly out of or as a consequence of following this project.

It is always advised to take proper care and precaution while working with AC Mains.

Step 2: The Triac

Step 1.

Cut the strip board to the desired size and trim & file the edeges.

Place the BT136/BTA12 Triac through the holes in the center leaving a couple of lines on either side. Solder and trim.

Step 3: The Diac

Insert the Diac, 1 leg of the Diac should connect to the

Gate of the Triac and the other leg to an empty strip on the strip board, solder and trim.

Step 4: The LDR

Insert the LDR, one leg of the LDR should connect to T1

or M1 of the Triac and the other to the same strip to which the second leg of the Diac is connected, solder and trim.

Step 5: The Resistor

Insert the Resistor as shown in the picture, the first

leg should be connected to the same strip on which the second legs of the Diac and the LDR are connected and the second leg, place across the Triac and connect to an empty strip on the strip board, solder and trim.

Step 6: The Mains Connection

Now connect the Mains Connection Wires.

Connect 2 wires, preferably of the same colour (I have used Black & blue)to the strip on the strip board on which the second leg of the Resistor is connected.

Connect 1 wire (RED) to the strip on the strip board on which the 1st leg (M1) of the Triac is connected

Connect 1 wire (WHITE) to the strip on the strip board on which the 2nd leg (M2) of the Triac is connected. Solder and trim as required

Refer to the drawing for the connections.

Mains Connections –

The Black Wire and the Red Wire go to the Mains AC Supply, this is the input.

The remaining two wires (White & Blue) go to the BULB

Step 7: Done

You can seal the entire circuit in a small plastic

translucent film canister which will keep the water out and also let the LDR function normally in outdoor use.

Thanks for viewing, I must add here that I have been using these circuits on the lamp-posts at our farms for the past couple of months now and they have been connected ever since and I have never had reason to complain as yet. We do have regular power outages for around 4 to 6 hours a day a and that is probably the only rest the circuit gets. Otherwise, the circuit is working as it was intended to and every evening the lights go on and at day break they turn off automatically. I will post pictures of the working lamp-posts ASAP.

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    28 Discussions

    0
    malcolmt1953
    malcolmt1953

    Question 8 weeks ago on Step 5

    Hi There,
    This looks like a super little project.
    I have one question, can you give me approx light and dark resistance to help me select suitable LDR's ?
    Regards
    Malcolm

    0
    manicmonday
    manicmonday

    Question 4 months ago

    I live in the States where we use 120vac. Will this work here? If not, what needs to change for it to work with 120vac?

    Thanks

    0
    ASHRAFUL-ALAM
    ASHRAFUL-ALAM

    Question 1 year ago

    Hey
    Your project is good. But i have a probrem in this. Could you please help.
    When its evening the lights blink for 10 to 15 times then turn on . Can you have a solution to solve this . Or put extra part in this circuit please tell

    0
    Top22
    Top22

    1 year ago on Step 7

    I use led bulb evening bulb on noise come capasitors led bulb and my amplifier to.. what im do..plese tell me

    0
    roshan-anwar
    roshan-anwar

    1 year ago

    Hey
    Your project is good. But i have a probrem in this. Could you please help.
    When its evening the lights blink for 10 to 15 times then turn on . Can you have a solution to solve this . Or put extra part in this circuit please tell

    0
    HarminderS7
    HarminderS7

    2 years ago

    Bhai if you can please post the photo of the back side of circuit it will be very helpful for the beginners like me.

    0
    RajendraKumarS
    RajendraKumarS

    2 years ago

    Hi this is a just small and low cost one, if PIR is used it will be good but that will cross our budget!.

    3
    BittuB4
    BittuB4

    Question 2 years ago

    What is the meaning of DIAC 3
    What is the value of this part

    0
    delhinewbazar
    delhinewbazar

    2 years ago

    i have made this diagram same as you described, but it is not working for me, when i switch on the circuit, the light just blink once and turned off, please suggest me what should i do

    0
    delhinewbazar
    delhinewbazar

    Question 2 years ago on Step 1

    i have made this diagram same as you described, but it is not working for me, when i switch on the circuit, the light just blink once and turned off, please suggest me what should i do

    0
    AlanV53
    AlanV53

    2 years ago

    I asked for 1W 100K Resistor. But the shop guy gave me a resistor with color codes of 'Red,Brown,Black and Gold'. Is it ok to use this.

    0
    jaatbuddhi
    jaatbuddhi

    Reply 2 years ago

    Red,Brown,Black and Gold is just 21 ohms. 100k is Brown Black Yellow (Gold is the tolerance) and 1 watt is the power handling capacity.

    0
    JanosM8
    JanosM8

    2 years ago

    About LDR: what is the part number? Or, if you don't know that, then what's its rated resistance for daytime?

    I tried with 100k/200k LDR and instead 100k I used 2M - because with 100k the led was on all the time - but even then he was not much sensitive. Are you using 10K LDR or even smaller?

    0
    jaatbuddhi
    jaatbuddhi

    Reply 2 years ago

    I'll get back to you on the resistance measurements after physically checking the resistance in the day time.
    The ones I have used are commonly available here and all we have to ask for are 5mm ldr (more commonly known by the size) the resistor value that I have used is not common to all types of ldr that are available and a little bit of experiment is required to figure out what works best for a particular type of Ldr.
    I will take physical readings as soon as I can and post an update on this
    Regards

    0
    JanosM8
    JanosM8

    2 years ago

    I have a question: where do you put the photoresistor in that canister? As far as I tested, if you put a photoresistor into something, it will not work as it should because the canister is not letting enough sunlight in. Or maybe it's different with translucent film canister?

    0
    jaatbuddhi
    jaatbuddhi

    Reply 2 years ago

    it works fine with a translucent film container like the ones shown in the pictures.

    0
    SanjeewaB
    SanjeewaB

    3 years ago

    Can you please send me the circuit layout

    0
    JanosM8
    JanosM8

    Reply 2 years ago

    Here you go. For you and for whoever need it.

    Untitled-1.jpg
    0
    Sameer_Akhtari
    Sameer_Akhtari

    3 years ago

    Hello. I like your Circuit. I have a question that if is full moon then it will turn off light?

    0
    jaatbuddhi
    jaatbuddhi

    Reply 3 years ago

    Thanks for your comment,

    I am using it for past 3 months or so, no problem with full moon, I suppose the light from the moon is not bright enough to turn off the circuit.

    I suppose, you can experiment with the value of the resistor to change the sensitivity of the LDR, I am using 100k, you could try 120k or 80k and see the difference it makes.

    Regards