light activated switch circuit conclusion
#1

What is the conclusion on making light activat
ed circuit?
Reply
#2
A Simple Light activated switch

Description.
This is the circuit diagram of a light activated switch based on National Semiconductors comparator IC LM 311 and a LDR.

The circuit is based on a voltage comparator circuit wired around IC 1.The non inverting in put of IC1 is given with a reference voltage of 6V using resistors R3 and R4. The input to the inverting input will be the voltage across the LDR that is light dependent. At darkness the resistance of the LDR will be high and so do the voltage across it. At this condition the voltage at the inverting input will be higher than the reference at non inverting pin and the out put of the comparator will be low(~o V). When the LDR is illuminated ,its resistance drops and so do the voltage across it.Now the voltage at inverting input will be lower than that at non inverting input and the out put of the comparator goes high (~12 V). This makes transistor Q1 on and it drives the relay.As a result we get a relay switching according to the intensity of the light falling on the LDR.

Light Activated Switch Circuit Diagram with Parts List .
Light Activated Switch Circuit
Light Activated Switch Circuit Diagram

Notes.
Adjust POT R1 to set the desired light intensity for switching the relay.For this illuminate the LDR with the desire intensity light.The relay will be either on or off.Adjust POT R1 slowly so that the state of the relay changes.That’s it.Now the circuit is set for the given intensity of light.
Assemble the circuit on a good quality PCB or common board.
You can use either a 12 V battery or a well regulated & filtered 12V DC mains operated power supply.
The pin 5&6 (Balance & Balance/Strobe ) of IC LM311 are shorted to minimize the chance of oscillations.
The pin out of LM311 is also given together with the circuit diagram.
We have more Lighting Circuits that you may be interested in;

1. Touch Dimmer for Lamps

2. Automatic LED Emergency Light

3. Flasher Circuit

4. Two Mode Night Light

5. Modified Lamp Dimmer Circuit

Tagged
Electronic Circuits
hobby projects
Light Related
Most Popular Circuits

You may also like:
Photocell based night light
LED ramping circuit.
Photo relay circuit
Flashing LED unit
How a LED works – Light Emitting Diode working
We recommend:
Air craft warning light circuit
How to work with the ADC unit of an AVR Micro-controller
PLL Operating Principle
Discrete Transistor Voltage Regulators
Difference between Procedure Oriented(POP) and Object Oriented Programming(OOP)
Reply

Important Note..!

If you are not satisfied with above reply ,..Please

ASK HERE

So that we will collect data for you and will made reply to the request....OR try below "QUICK REPLY" box to add a reply to this page
Popular Searches: conclusion on emmision standard in light and heavy vehicle, clap activated switch, code of voice activated switch for door lock using pic887 in c, literature review on sound activated switch, project remote wireless light switch circuit diagram, laser activated robot with circuit diagram, sound activated light pdf,

[-]
Quick Reply
Message
Type your reply to this message here.

Image Verification
Please enter the text contained within the image into the text box below it. This process is used to prevent automated spam bots.
Image Verification
(case insensitive)

Possibly Related Threads...
Thread Author Replies Views Last Post
  How there celebrating light of unified's living not later than paying it cheeky 0 491 18-10-2019, 07:47 PM
Last Post:
  code for avr atmega16 with gsm 900 to control light 2 965 24-01-2019, 12:03 PM
Last Post:
  traffic alert system circuit for blind tums 0 655 04-11-2018, 02:42 PM
Last Post: Guest
  to construct a switch using a transistor project pdf 0 825 27-10-2018, 11:07 PM
Last Post: Guest
  electric iron circuit diagram free 0 678 18-10-2018, 06:40 PM
Last Post: Guest
  literature review for automatic voltage changeover switch article 0 817 03-10-2018, 06:42 PM
Last Post: Guest
  advantages and disadvantages mains failure alarm circuit in pdf 0 780 01-10-2018, 11:48 PM
Last Post: Guest
  attendance monitoring intelligent classroom circuit diagram 0 582 26-09-2018, 07:05 PM
Last Post: Guest
  led 720 emergency light circuit diagram 0 648 22-09-2018, 01:48 AM
Last Post: Guest
  led 720 emergency light circuit diagram 0 653 19-09-2018, 09:10 PM
Last Post: Guest

Forum Jump: