Title:

Sensor-Based E-Waste Lion Model with Sound & Motion Response

Introduction:

This project is an innovative robotic lion made entirely from electronic waste materials, designed to mimic a lion’s real-life behavior. It is equipped with sensors and programmed using an Arduino to detect human presence, roar, and move its tail. The aim is to encourage eco-friendly innovation and hands-on STEM learning.

Features & Design:

• Eco-friendly Construction: Made from e-waste like old toy parts, scrap wires, unused motors.

• Interactive Behavior: Detects motion up to 2 meters.

• Realistic Response: Roars and wags tail when someone approaches.

• ducational Purpose: Designed as a student project under guidance for learning embedded systems and sustainability.

  Program & Code:

  The code is written in Arduino IDE and uses:

  • Ultrasonic Sensor (HC-SR04) for proximity detection.

  • Servo Motor to wag the tail.

  • Speaker to play roaring sound.

   Code link https://www.dropbox.com/scl/fi/wh3z4kinhomxm5oibzsmc/Sensor_Lion_Project_Code.txt?rlkey=gg38bvk8vf9b4ofyn3sna4w2k&st=92umffmk&dl=0                                                                                                                                Full documentation PDF: https://www.dropbox.com/scl/fi/dwrj2go7zlbc0qz0m0gdu/Sensor-Lion-Project-Report.pdf?rlkey=q498m3yhj60jesu1f49d09kun&st=j3yxelsf&dl=0

   

   

   

   
   

  Schematic Diagram:

• Block-level schematic of the sensor-based robotic lion using Arduino UNO, ultrasonic sensor for detection, and servo motors for interactive motion.

• https://www.dropbox.com/scl/fi/rzgddieg6hsn4h5zpp2ex/sensor_lion_schematic.png?rlkey=jm7yasi93tzj4c2ijv9jp45u6&st=ktwa3rn1&dl=0

  • Arduino UNO

  • HC-SR04 sensor connections

  • Servo Motor PWM pin

  • Speaker via Digital Pin

     

    • Step 1: Structure Assembly

      • Gather e-waste like computer E waste, plastic covers, old motor casing.

      • Attach servo motor inside the tail area.

      • Fix the ultrasonic sensor in the lion’s face.

      Step 2: Circuit Setup

      • Connect HC-SR04 sensor to Arduino: Trig → D9, Echo → D8.

      • Connect Servo to D6.

      • Connect speaker to D4.

      • Power the board using USB or battery.

        Step 3: Upload the Code

        • Write/upload code in Arduino IDE.

        • Use tone() or DFPlayer for sound.

        • Servo moves based on sensor detection.

        Step 4: Test & Finalize

        • Upload code and power on.

        • Lion detects someone within 2m → roars and wags tail.

        • Make adjustments for smoother operation.

          Step 5: Show It Live!

          • Video linkhttps://www.instagram.com/reel/Crz15qOInrx/?igsh=MWNqbTJzZzExaGxhYw==

          • GitHub:[https://github.com/Prat06-ece/Sensor-Lion-Ewaste