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Dark Sensitive Switch
- Rajkumar Sharma
- 16.591 Views
- easy
- Tested
- SKU: EL34585
- Quote Now
- 0 Likes
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
Parts
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PCB
sir pls send me pcb layout image or layout work file
Sir, I want to buy this circuit. Please tell how to pursue.
Check on http://www.kealab.com for a kit of this project
hi, what is the value LDR ? 100k, 500k or 1M ?
A 100k should work nice.
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
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.