Dark Sensitive Switch

  • Rajkumar Sharma
  • 15375
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  • 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

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PCB

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yuvaraj

sir pls send me pcb layout image or layout work file

Arun Verma

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

nosert

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

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

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