$0.1 Dusk to Dawn Switch Low Cost Simple Dusk to Dawn Switch Dark Sensing Light Automatic Lights

Introduction: $0.1 Dusk to Dawn Switch Low Cost Simple Dusk to Dawn Switch Dark Sensing Light Automatic Lights

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Turn your security lighting or task lighting on and off automatically each night with this circuit. It's easy to install.

Step 1: Components List

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

Make connections as shown in circuit, for more details Visit Link blog.circuits4you.com

Step 3: Test Your Circuit

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..

5. Find difficulty in building circuit comment me on my blog.circuits4you.com

Home Automation

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Home Automation

1 Person Made This Project!

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9 Comments

0
rmaj
rmaj

Question 2 months ago

Does DB3 Diac have to be 230v? Asking as I've found only 40v ones.

0
tudoraditudor
tudoraditudor

Answer 2 months ago

It is not even recommended to use 230V diac. This electronic component is used to open the triac to allow him to conduct electric current. Kepping in mind that this circuit is used in AC voltage (eg. 230V ac), the diac will "polarize" the triac starting from 40V ( if you use 40V diac) and up to the max voltage (230V). You can even use lower voltage diac. 28V or 32V.
Good luck and be careful that this circuit it uses 230V and you can be electrocuted.

0
Kc8psw
Kc8psw

1 year ago on Introduction

Yup, built it today. Had to bread board circuit to make sure it worked. Changed the resistor to 100K so trial would not self trigger. Thank you for the design!

0
2jfrench
2jfrench

Question 3 years ago on Introduction

Would this work with a 12 volt power supply. If not what would need to do change it to work with 12 volt power supply. Thanks

0
datbates
datbates

Reply 4 years ago

So did this actually work. Everyone else seems to claim it doesn't. It seems like a great solution to my problem of a high power instant acting dusk to dawn sensor.

0
SanjeewaB
SanjeewaB

5 years ago

Not working !!!

0
braytonlarson
braytonlarson

7 years ago

What exactly does a Triac do? I've heard people use them in place of Relays but you have to be careful with them. It looks like a mosfet / transitor but it can handle AC voltage. Aren't you supposed to put a diode between the output of the Triac and the second Mains wire?

0
Komal Manoj Thakur
Komal Manoj Thakur

Reply 7 years ago on Introduction

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.