Smart Traffic Light: Adaptive Street Lighting Powered by IoT

The Smart Traffic Light is an IoT‑enabled street lighting system that automatically turns on during low ambient light and turns off when daylight returns. It also monitors lamp health and reports faults to maintenance teams.

Overview

Traditional street lights often stay on after sunset or remain lit during cloudy days, wasting energy and creating maintenance challenges. The Smart Traffic Light solves these issues by combining light‑dependent resistors (LDRs), passive infrared (PIR) motion sensors, and an Arduino‑Raspberry Pi data‑hub to deliver intelligent, energy‑efficient lighting.

How It Works

• Ambient Light Detection: An LDR mounted on the lamp post measures road illumination. When the reading drops below a set threshold (indicating night or cloud cover), the lamp turns on; otherwise it remains off.
• Lamp Health Monitoring: A second LDR positioned beside the lamp captures the lamp’s emitted light. By storing the baseline reading when the lamp is new, the system can detect significant drops in brightness—an early warning for flickering or impending failure.
• Motion Sensing: A PIR sensor with a 7‑meter range detects passing vehicles, animals, or pedestrians. If motion is detected while the lamp is off, the system can keep the lamp on for the duration of activity.
• Data Transmission: An Arduino Nano reads the sensor values and forwards them to a Raspberry Pi, which uploads the data to Artik Cloud. Maintenance staff can receive real‑time alerts via a dedicated Android app.
• Remote Control: The Android app sends commands back through Artik Cloud to the Raspberry Pi, which can toggle an LED or control the lamp’s relay. This feature allows technicians to verify the correct lamp during repairs, even in low‑light conditions.

Technical Resources

• Circuit Simulation
• Arduino & Raspberry Pi Remote‑Control Tutorial
• Artik Cloud IoT & Android Integration

All source code for Arduino, Raspberry Pi, and Android is provided in the project repository.

Watch a demonstration video of the Smart Traffic Light in action here (video link placeholder).

If you’re interested in building this project or have questions, leave a comment below.

Source more detail: Smart Traffic Light