DIY Light ON & OFF Using LDR Sensor Module without Arduino | Simple DIY Science Project for Students

Project Contains

• LDR (Light Dependent Resistor) sensor module
• 1 Channel Relay module 
• LED light
• Connecting wires
• Battery with Charging Module
• Sunboard board 

How It Works

• This project works on the principle of light intensity detection using an LDR sensor.
• In bright light, the resistance of the LDR decreases.
• In darkness, the resistance of the LDR increases.
• The sensor module compares the light level with a preset threshold:
• When it becomes dark, the circuit automatically turns ON the light.
• When sufficient light is present, the circuit turns OFF the light.
• No Arduino or microcontroller is required, making this project simple, low-cost, and ideal for beginners.

Applications

• Automatic street light systems
• Night lamp automation
• Energy-saving lighting systems
• Home and garden lighting control
• School science exhibitions
• Smart lighting demonstrations
• Basic electronics learning projects

Learning Outcomes

• Understanding of LDR sensor working principle
• Knowledge of automatic control systems
• Basics of analog electronics and switching circuits
• Practical experience with relay control
• Awareness of energy conservation concepts
• Hands-on learning without programming