Story
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:
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Eco-friendly Construction: Made from e-waste like old toy parts, scrap wires, unused motors.
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Interactive Behavior: Detects motion up to 2 meters.
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Realistic Response: Roars and wags tail when someone approaches.
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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:
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Ultrasonic Sensor (HC-SR04) for proximity detection.
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Servo Motor to wag the tail.
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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:
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Block-level schematic of the sensor-based robotic lion using Arduino UNO, ultrasonic sensor for detection, and servo motors for interactive motion.
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https://www.dropbox.com/scl/
fi/rzgddieg6hsn4h5zpp2ex/ sensor_lion_schematic.png? rlkey= jm7yasi93tzj4c2ijv9jp45u6&st= ktwa3rn1&dl=0 -
Arduino UNO
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HC-SR04 sensor connections
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Servo Motor PWM pin
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Speaker via Digital Pin
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Step 1: Structure Assembly
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Gather e-waste like computer E waste, plastic covers, old motor casing.
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Attach servo motor inside the tail area.
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Fix the ultrasonic sensor in the lion’s face.
Step 2: Circuit Setup
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Connect HC-SR04 sensor to Arduino: Trig → D9, Echo → D8.
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Connect Servo to D6.
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Connect speaker to D4.
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Power the board using USB or battery.
Step 3: Upload the Code
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Write/upload code in Arduino IDE.
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Use
tone()
orDFPlayer
for sound. -
Servo moves based on sensor detection.
Step 4: Test & Finalize
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Upload code and power on.
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Lion detects someone within 2m → roars and wags tail.
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Make adjustments for smoother operation.
Step 5: Show It Live!
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