Automatic Street Light Using Transistor

Circuit Diagram :-




Circuit Layout:-




Components:-


  • R1 = 1 k
  • R2 = 1 k
  • Jp1 = LDR
  • T1 = BC547
  • R3 = 10 k
  • R4 = 1 k
  • LED 5 mm

Working :-

The LED in this project will be turn on during night and turn off during day. Generally a (LDR) Light Depending Resistor is using here to sense the presence of LIGHT. We cannot join LED directly to LDR. Several switching methods are must to make an LED to respond, when LDR is set aside at Dark or light then transistors will be work as a Switch. When LDR will be in light then LED will be OFF and when LDR will be in darkness at that time LED will be ON.




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