Dark Sensitive Switch

  • Rajkumar Sharma
  • 9873
    Views
  • easy
  • Tested

photo (1)

Description

Dark Sensitive switch project based on single BC547 transistor, Relay operates when light that falls on the LDR, goes below a set point. It’s very simple and low cost dark sensitive switch required few components.

Features

  • Input : 12 VDC @ 55 mA
  •  Relay output : NC – C – NO
  •  Onboard preset to set the level
  •  Power-On LED indicator
  •  Relay On LED indicator
  •  Screw terminal connector for easy relay output connection
  •  Four mounting holes of 3.2 mm each
  •  PCB dimensions 44 mm x 40 mm

Schematic

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Parts

bom

PCB

Comments

  • yuvaraj

    sir pls send me pcb layout image or layout work file

    3 years ago
  • Arun Verma

    Sir, I want to buy this circuit. Please tell how to pursue.

    3 years ago
  • nosert

    hi, what is the value LDR ? 100k, 500k or 1M ?

    2 years ago
    • Electronics Lab

      A 100k should work nice.

      2 years ago
  • Sunny Sharma

    i have the same circuit, i did connected the input 12v, LEDS are glowing fine, but i dont know the relay connections can you please help or any short video would be a great favour on my head.

    Regards

    Sunny

    1 year ago
    • admin

      The relay acts as a mechanical switch. There are 3 pins available, a common pin and NO, NC pins. NO means “normal open”‘ and NC means “normal connected”. Depending on your application you can use 2 of these pins to form a switch that is closed or opened when the relay energizes.

      1 year ago

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