Dark Sensor Using LDR(light Dependent Resistor)
by bhaskar4n in Circuits > LEDs
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Dark Sensor Using LDR(light Dependent Resistor)
![DSC_0022[1].jpg](/proxy/?url=https://content.instructables.com/F1R/F1QA/HU0GMPPU/F1RF1QAHU0GMPPU.jpg&filename=DSC_0022[1].jpg)
This circuit sense the darkness and turn on the LED
Components Required:
LDR - 1
10k trimpot - 1 or 10k resistor
1k resistor - 2
BC 547 transistors - 2
LED - 1
battery - 9v
Dark Sensor Schematic Circuit Diagram
This is the schematic circuit diagram. it is drawn in eagle cad pcb software. also i have attached eagle schematic file here...
Downloads
Dark Sensor Pcb Board Layout Diagram
finally this is the pcb board layout for the dark sensor. also i have attached the eagle board layout file here
Downloads
Final Output
![DSC_0025[1].jpg](/proxy/?url=https://content.instructables.com/FXH/U7T9/HU0GMRJZ/FXHU7T9HU0GMRJZ.jpg&filename=DSC_0025[1].jpg)
In this picture the LDR detects the dark and turn on the LED