Automatic Street Light Control(STEAM Education)

Connection Procedure:     

Step 1: Connect the positive terminal (+Ve) of the power supply (Pin 62) to one end of the 330K resistor (Pin 13).

Step 2: Connect the other end of the 330K resistor (Pin 14) to the base of the NPN transistor (Pin 30).

Step 3: Connect the emitter of the NPN transistor (Pin 29) to the negative terminal (-Ve) of the power supply (Pin 59).

Step 4: Connect one terminal of the LDR (Pin 80) to the base of the NPN transistor (Pin 30).

Step 5: Connect the other terminal of the LDR (Pin 79) to the negative terminal (-Ve) of the power supply (Pin 59).

Step 6: Connect the positive terminal (+Ve) of the power supply (Pin 62) to the anode of the LED (Pin 43).

Step 7: Connect the cathode of the LED (Pin 44) to one end of the 100Ω resistor (Pin 1).

Step 8: Connect the other end of the 100Ω resistor (Pin 2) to the collector of the NPN transistor (Pin 31).
Step 9: Before powering on the circuit, double-check all connections to ensure they match the specified pin numbers and are securely connected.

 

The circuit operates by turning off the LED during daylight when the Light Dependent Resistor (LDR) detects high ambient light levels and turning it on at night when the LDR detects low light levels.

 

Explanation:

This project aims to create an automatic street light system that eliminates the need for manual control. It utilizes a Light Dependent Resistor (LDR) which senses ambient light. During daylight, the LDR's resistance increases, causing a transistor to switch off the LED. As evening sets in and light decreases, the LDR's resistance drops, triggering the transistor to conduct, thereby illuminating the LED.

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