TV Auto Off if Watching it from Near Distance

Complete Description:

Project Overview:

The “TV Auto Off if Watching it from Near Distance” working model is a sensor-based automation project designed for students. It educates viewers on the importance of maintaining a safe distance from screens to protect eyesight. By using an IR (Infrared) sensor, the model detects if someone is sitting too close to the “TV” and then automatically switches it off through a relay and control circuit.

Project Dimensions:

• Base Size: 40 cm × 50 cm
• Ideal for demonstration in classrooms and science exhibitions.

Materials Used:

• Foam board or Sun board (base structure)
• LED Strips (simulate TV screen illumination)
• IR Sensor (detects viewer proximity)
• PCB board (for assembling components)
• Relay Module (for switching TV ON/OFF)
• 7805 Voltage Regulator (maintains stable 5V for the circuit)
• Transistor
• Diode
• Resistors
• Connecting wires
• 9V Battery Clip

Working Principle:

The project uses an IR sensor to detect distance. When someone sits too close to the TV model, the sensor sends a signal to the transistor switch, which activates the relay module. The relay then disconnects power to the LED strips (which represent the TV screen), simulating that the TV has turned off due to unsafe viewing distance. When the person moves back, the IR sensor allows the system to turn the screen back on.

Functioning Steps:

1. Power ON – A 9V battery powers the entire setup through a 7805 voltage regulator.
2. Distance Monitoring – The IR sensor constantly checks the distance of the viewer.
3. Trigger Activation – If someone comes too close, the IR sensor sends a LOW signal.
4. Relay Switches OFF – The transistor activates the relay, cutting power to the LED strips.
5. Auto Reset – When the person moves back, the sensor returns to HIGH and power is restored.

Educational Value:

• Encourages healthy screen viewing habits.
• Demonstrates automation using sensors and relays.
• Introduces students to basic electronics, IR detection, and safety applications.
• Useful for understanding smart home technology concepts.

Safety Note:

This is a low-voltage and safe-to-use model, ideal for students in school-level science exhibitions. No high-voltage components are used.

Applications & Learning Outcomes:

• Promotes eye health awareness through innovative automation.
• Provides hands-on learning of sensor-triggered circuits.
• Develops understanding of relay-based power control and IR sensing technology.