Circuit Documentation

Summary

This circuit is designed to control a bulb using a motion sensor and a transistor. The circuit includes a power supply, a voltage regulator, a motion sensor, a transistor, a bulb, and a rocker switch. When motion is detected by the HC-SR501 motion sensor, it triggers the NPN transistor, which in turn powers the bulb. The 7805 voltage regulator ensures that the motion sensor receives a stable 5V supply.

Component List

1. HC-SR501 Motion Sensor

   • Pins: GND, OUT, VCC
   • Description: A motion sensor that detects infrared radiation and outputs a signal when motion is detected.
   • Purpose in Circuit: Detects motion and sends a signal to the transistor.

2. NPN Transistor

   • Pins: E (Emitter), C (Collector), B (Base)
   • Description: A type of bipolar junction transistor used for switching and amplification.
   • Purpose in Circuit: Acts as a switch to control the bulb based on the signal from the motion sensor.

3. Battery Case

   • Pins: +, -
   • Description: Holds the batteries that provide power to the circuit.
   • Purpose in Circuit: Supplies power to the entire circuit.

4. Bulb

   • Pins: +, -
   • Description: A light bulb that illuminates when powered.
   • Purpose in Circuit: Provides visual indication when the circuit is activated.

5. 7805 Voltage Regulator

   • Pins: Vin, Gnd, Vout
   • Description: A voltage regulator that outputs a stable 5V.
   • Purpose in Circuit: Provides a stable 5V supply to the motion sensor.

6. Rocker Switch

   • Pins: input, output
   • Description: A switch that can be toggled to connect or disconnect the circuit.
   • Purpose in Circuit: Allows manual control to turn the circuit on or off.

Wiring Details

HC-SR501 Motion Sensor

• GND is connected to:

  • Gnd of the 7805 Voltage Regulator
  • • of the Battery Case
  • B of the NPN Transistor

• OUT is connected to:

  • C of the NPN Transistor

• VCC is connected to:

  • Vout of the 7805 Voltage Regulator

NPN Transistor

• B (Base) is connected to:

  • Gnd of the 7805 Voltage Regulator
  • GND of the HC-SR501 Motion Sensor
  • • of the Battery Case

• C (Collector) is connected to:

  • OUT of the HC-SR501 Motion Sensor

• E (Emitter) is connected to:

  • • of the Bulb

Battery Case

• + is connected to:

  • input of the Rocker Switch

• - is connected to:

  • Gnd of the 7805 Voltage Regulator
  • GND of the HC-SR501 Motion Sensor
  • B of the NPN Transistor

Bulb

• + is connected to:

  • output of the Rocker Switch
  • Vin of the 7805 Voltage Regulator

• - is connected to:

  • E of the NPN Transistor

7805 Voltage Regulator

• Vin is connected to:

  • output of the Rocker Switch
  • • of the Bulb

• Gnd is connected to:

  • GND of the HC-SR501 Motion Sensor
  • • of the Battery Case
  • B of the NPN Transistor

• Vout is connected to:

  • VCC of the HC-SR501 Motion Sensor

Rocker Switch

• input is connected to:

  • • of the Battery Case

• output is connected to:

  • Vin of the 7805 Voltage Regulator
  • • of the Bulb

Code

There is no code associated with this circuit.