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Wednesday, May 27, 2015

$0.1 Dusk to Dawn Switch Low cost simple dusk to dawn switch Dark Sensing Light Automatic Lights



Worlds simplest Dusk to Down Switch

Turn your security lighting or task lighting on and off automatically each night with this circuit. It's easy to install
Step 1: Components Required
1. TRIAC BT136 or BTA16
2. LDR
3. 104 (0.1uF) Capacitor
4. 1K Ohm 1/4 Watt Resistor
5. DB3 Diac
6. Connecting Wires

Step 2: Connection Diagram


Step 3: Testing
1. Warning This Circuit Operates at AC 120V or 230V
2. Connect This circuit in series with lamp as Shown in Circuit diagram.
3. Take care that Lamp Light should not fall on LDR, This can cause false turn off or looping oscillations.
4. Save energy Go green..
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11 comments:

  1. AnonymousJune 16, 2015 at 5:53 AM

    Hi,
    I am a 12th standard student and I am fond of electronics. Can you please explain how the given circuit works.

    ReplyDelete
  2. kmlJune 23, 2015 at 4:09 AM

    TRIAC is a device that will acts as relay, Semiconductor Switch. It can handle 400V AC 16Amps (BTA16) More than enough. No need of diode, we want to pass the AC supply. It works on basic principle, LDR when Light is more the resistance of LDR becomes low, so the charging of capacitor voltage is not enough to trigger the TRIAC. So it remains off during day time. At night LDR resistance become high and allows capacitor to charge above TRAIC triggering voltage threshold so Lights are on at night.

    ReplyDelete
  3. AnonymousJuly 27, 2015 at 6:45 PM

    i tried to do this circuit but the 1k resistor burns, with light.

    ReplyDelete
  4. AnonymousNovember 21, 2015 at 5:15 AM

    I tried this circute, but the light is not getting off during day time or when light falls on the LDR. All components are connected as mentioned. Also please guide me whether I can use a LED bulb at the lamp load.

    ReplyDelete
  5. UnknownDecember 6, 2015 at 12:18 AM

    Hi, what is resistance of LDR when is totaly dark ? trying to find alternatives. Could be used LDR with total dark 300 k ?

    ReplyDelete
  6. UnknownDecember 11, 2015 at 7:25 PM

    Sir I tried but 1k resister burned

    ReplyDelete
  7. UnknownDecember 11, 2015 at 7:27 PM

    I tried this but 1k resister burn please reply me

    ReplyDelete
  8. UnknownMarch 15, 2016 at 7:36 PM

    I assembled as what you shown in the picture but the light is always on

    ReplyDelete
  9. UnknownMarch 16, 2016 at 12:29 AM

    I tried this but the light glowing continuously. LDR play no role

    ReplyDelete

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