DIY Mini Auto Night Lamp


 Creating a DIY mini auto night lamp with a dark sensor can be a fun and practical project. Here's a simple step-by-step guide to help you build your own:

Pakistan Science Club E-Learning Online Store


Materials Needed:

  1. Light-emitting diode (LED)
  2. Dark sensor module
  3. Resistor (220-ohm)
  4. Transistor (NPN, e.g., BC547)
  5. LDR (Light-Dependent Resistor)
  6. Battery (9V)
  7. Breadboard and jumper wires
  8. Electrical tape
  9. Small project box (optional)

Steps:

1. Understand the Components:

  • Familiarize yourself with the components and their functions: LED (output), dark sensor module (detects ambient light), resistor (limits current), transistor (amplifies current), LDR (resistance changes with light).

2. Setup the Dark Sensor Module:

  • Connect the dark sensor module to the breadboard.
  • It typically has three pins: VCC, GND, and OUT. Connect VCC to the positive rail, GND to the negative rail, and OUT to a free row.

3. Connect the Transistor:

  • Connect the transistor (e.g., BC547) to the breadboard.
  • Connect the collector pin to the positive rail, the emitter pin to the ground rail, and the base pin to the OUT pin of the dark sensor module.

4. Add the LED:

  • Connect the LED to the breadboard.
  • Connect the longer leg (anode) to the collector pin of the transistor through a 220-ohm resistor.
  • Connect the shorter leg (cathode) to the ground rail.

5. Integrate the LDR:

  • Connect the LDR to the breadboard.
  • Connect one leg of the LDR to the positive rail and the other leg to the negative rail.

6. Complete the Circuit:

  • Connect a jumper wire from the junction of the dark sensor module's OUT pin and the transistor's base pin to the point between the LDR and the negative rail.

7. Power the Circuit:

  • Connect a 9V battery to the positive and negative rails of the breadboard.

8. Test the Night Lamp:

  • Cover the LDR with your hand or place it in a dark environment to see if the LED lights up.
  • Experiment with the sensitivity of the dark sensor module and resistor values for optimal performance.

9. Secure and Enclose (Optional):

  • If desired, place the components in a small project box.
  • Secure components with electrical tape or glue.

10. Finalize:

  • Make any necessary adjustments and ensure the circuit works reliably in different lighting conditions.

Congratulations! You've created a DIY mini auto night lamp with a dark sensor. This simple project demonstrates the basics of light-sensing circuits and can be a great addition to your home or workspace.