How to make Smart Street Lights using Arduino || Best Science Project || SKR Electronics Lab

Scientific Concepts and Natural Phenomena Presented

• Smart street lighting technology: The project involves creating street lights that adjust brightness based on ambient light and motion detection, optimizing energy consumption.
• Light sensing: Using IR (infrared) sensors to detect objects (like cars or hands) to increase brightness when motion is detected.
• Ambient light detection: The lights remain off during daytime (high ambient light) and turn on dimly at night.
• Energy efficiency: Lights operate at low brightness throughout the night and only increase to full brightness when motion is detected, saving energy.

Methodology / Project Construction Outline

1. LED Preparation

• Use white LEDs.
• Identify positive (longer leg) and negative (shorter leg) terminals.
• Cut excess LED legs and solder long wires to positive and negative ends.

2. Street Light Assembly

• Fix LED on a plastic spoon using hot glue.
• Attach the spoon to a PVC pipe with holes drilled at top and bottom.
• Secure wires properly using glue.
• Add thermocol on top for finishing.
• Make four identical street light units.

3. Base Construction

• Use MDF board as base.
• Cover with black art paper.
• Attach an electric casing on the base.
• Fix the four street lights on the casing.

4. Wiring Setup

• Connect all negative (ground) wires of LEDs together.
• Connect positive wires individually with 100-ohm resistors.
• Use IR sensors (four units) mounted next to each street light.
• Connect VCC and ground pins of all IR sensors together.
• Connect output pins of IR sensors to Arduino digital input pins (D2 to D5).
• Connect positive LED wires (through resistors) to Arduino digital output pins (D6, D9, D10, D11).

5. Arduino and Sensor Integration

• Use Arduino Nano mounted on a mini breadboard.
• Connect Arduino 5V and ground to breadboard power rails.
• Connect IR sensor power and ground to breadboard rails.
• Connect sensor outputs to Arduino digital pins.
• Connect LED negative wires to Arduino ground.
• Connect LED positive wires (via resistors) to Arduino digital pins.
• Connect an additional LR sensor module to Arduino for extra sensing (connected to pin D7).

6. Power Supply

• Use two 18650 lithium-ion batteries (3.7V each) in a holder.
• Add a switch between battery positive terminal and Arduino VIN pin.
• Connect battery ground to Arduino ground.

7. Programming the Arduino

• Install Arduino IDE software.
• Load provided code (available for purchase).
• Adjust brightness settings in the code (range 60 to 250).
• Select Arduino Nano board and correct COM port.
• Upload the code.
• Troubleshoot errors by selecting the correct processor or checking Serial Monitor.
• Use online resources (like 4GBD) for debugging help.

8. Testing

• Turn on the switch and test under bright light (LEDs off).
• Turn off ambient light (LEDs glow dim).
• Wave hand or move object in front of sensors (LEDs glow at full brightness).
• Use flashlight to simulate day/night detection (LEDs turn off in bright light).

Researchers / Sources Featured

• SKR Electronics Lab (video creator and presenter)
• Altum Design (sponsor and PCB design software provider)

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This project demonstrates practical applications of Arduino, IR sensors, and LEDs to create energy-efficient, motion-activated street lights that operate based on ambient lighting conditions.