Dark Sensitive Switch
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.
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
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.
Please send me the PCB layout file or image. I need it for my graduation project.”