Circuit Documentation

Summary

This circuit is designed to control an LED using a BC547 transistor, a photocell (LDR), a resistor, and a 9V battery. The LED will light up based on the light intensity detected by the photocell. The BC547 transistor acts as a switch, controlled by the photocell and resistor network.

Component List

1. BC547 Transistor

   • Pins: Collector, Base, Emitter
   • Description: NPN Bipolar Junction Transistor
   • Purpose in Circuit: Acts as a switch to control the LED based on the input from the photocell.

2. Photocell (LDR)

   • Pins: pin 0, pin 1
   • Description: Light Dependent Resistor
   • Purpose in Circuit: Senses the ambient light level and provides a variable resistance based on the light intensity.

3. Resistor

   • Pins: pin1, pin2
   • Description: Fixed Resistor
   • Properties: 100 Ohms
   • Purpose in Circuit: Limits the current flowing through the circuit to protect the components.

4. 9V Battery

   • Pins: -, +
   • Description: Power Source
   • Purpose in Circuit: Provides the necessary voltage to power the circuit.

5. LED: Two Pin (red)

   • Pins: cathode, anode
   • Description: Light Emitting Diode
   • Purpose in Circuit: Emits light when current flows through it.

Wiring Details

BC547 Transistor

• Collector: Connected to the cathode of the LED.
• Base: Connected to pin 1 of the Photocell and pin 2 of the Resistor.
• Emitter: Connected to pin 0 of the Photocell and the negative terminal of the 9V Battery.

Photocell (LDR)

• pin 0: Connected to the Emitter of the BC547 Transistor and the negative terminal of the 9V Battery.
• pin 1: Connected to the Base of the BC547 Transistor and pin 2 of the Resistor.

Resistor

• pin1: Connected to the anode of the LED and the positive terminal of the 9V Battery.
• pin2: Connected to the Base of the BC547 Transistor and pin 1 of the Photocell.

9V Battery

• - (Negative): Connected to pin 0 of the Photocell and the Emitter of the BC547 Transistor.
• + (Positive): Connected to the anode of the LED and pin 1 of the Resistor.

LED: Two Pin (red)

• cathode: Connected to the Collector of the BC547 Transistor.
• anode: Connected to the positive terminal of the 9V Battery and pin 1 of the Resistor.

Code

No microcontroller code is provided for this circuit.