Category 1: Embedded Systems & IoT

1. Smart Dustbin with Ultrasonic Sensor
   
   
• Description: A smart dustbin that uses an ultrasonic sensor to detect its fill level. When full, the microcontroller lights up an LED and sends a notification to a local server or mobile app for efficient waste management.
  
  
• Tools: Arduino Uno/NodeMCU, HC-SR04 Ultrasonic sensor, servo motor, LED, power supply, ESP8266 module.
  
  
2. Home Automation with Voice Control
   
   
• Description: Control appliances like lights and fans using voice commands. A microphone captures the voice, the microcontroller processes it, and a relay switches the appliances.
  
  
• Tools: Arduino Uno/Raspberry Pi, speech recognition module, relay board, C/C++ programming.
  
  
3. Automated Street Light System
   
   
• Description: Automatically turns street lights on at dusk and off at dawn using an LDR sensor.
  
  
• Tools: Arduino Uno, LDR, relay, transistor, resistors, DC power supply.
  
  
4. IoT-based Temperature and Humidity Monitoring
   
   
• Description: Monitors and sends room/greenhouse temperature and humidity data to a cloud platform for real-time visualization.
  
  
• Tools: ESP32/NodeMCU, DHT11/DHT22, power supply, Blynk/ThingSpeak.
  
  

Category 2: Robotics & Automation

1. Line Follower Robot
   
   
• Description: A robot that follows a black line using IR sensors and motor control logic.
  
  
• Tools: Arduino Uno, IR sensor array, DC motors, L298N motor driver, chassis, power supply.
  
  
2. Obstacle Avoiding Robot
   
   
• Description: A robot that avoids obstacles using ultrasonic sensors and navigation algorithms.
  
  
• Tools: Arduino Uno, HC-SR04 Ultrasonic sensor, DC motors, motor driver, chassis, battery.
  
  
3. Gesture Controlled Robot
   
   
• Description: Controlled using hand gestures detected by accelerometer or flex sensors.
  
  
• Tools: Arduino Uno, ADXL335 accelerometer/flex sensors, RF modules, DC motors, power supply.
  
  
4. DIY Robotic Arm
   
   
• Description: A robotic arm for pick-and-place operations, controlled by potentiometers or joysticks.
  
  
• Tools: Arduino Uno, servo motors, joystick/potentiometer, robotic arm chassis, power supply.
  
  

Category 3: Communication & RF

1. DTMF-based Home Automation
   
   
• Description: Control appliances using phone DTMF tones decoded by a microcontroller.
  
  
• Tools: Arduino Uno, MT8870 DTMF decoder, mobile phone, relay board, power supply.
  
  
2. Wireless Power Transfer
   
   
• Description: Demonstrates inductive coupling to wirelessly power an LED.
  
  
• Tools: 555 timer IC, transistor, copper coils, LED, capacitor, 9V battery.
  
  
3. DIY FM Radio Transmitter
   
   
• Description: A low-power FM transmitter to broadcast audio signals.
  
  
• Tools: BC547 transistor, capacitor, resistor, inductor, microphone, power supply.
  
  
4. Bluetooth-controlled LED Matrix Display
   
   
• Description: Displays custom text on an LED matrix via smartphone Bluetooth commands.
  
  
• Tools: Arduino Uno, 8x8 LED matrix (MAX7219), HC-05 Bluetooth module.
  
  

Category 4: Power Electronics & Energy

1. Solar Mobile Charger
   
   
• Description: A solar panel-based charger with overcharge protection.
  
  
• Tools: Solar panel, Li-ion battery, TP4056 charging module, DC-DC converter, USB cable.
  
  
2. Mini Inverter Circuit
   
   
• Description: Converts low DC voltage (9V) into AC using an oscillator and transformer.
  
  
• Tools: 555 timer IC, transistor, transformer, resistors, capacitors, 9V battery.
  
  
3. Automatic Water Level Controller
   
   
• Description: Turns pump on when water is low and off when full using conductive probes.
  
  
• Tools: Arduino Uno, water level sensor, relay module, pump, power supply.
  
  

Category 5: Sensor-Based Projects

1. Clap Switch
   
   
• Description: A sound-activated switch that turns an appliance on/off with a clap.
  
  
• Tools: Arduino Uno, microphone, relay, transistor, power supply.
  
  
2. Alcohol Detection and Engine Locking System
   
   
• Description: Prevents a vehicle from starting if alcohol is detected in breath.
  
  
• Tools: Arduino Uno, MQ-3 sensor, relay, buzzer/LED, power supply.
  
  
3. Rain Alarm Circuit
   
   
• Description: Uses a rain sensor to trigger an alarm when rain is detected.
  
  
• Tools: 555 timer IC, rain sensor, buzzer, resistors, power supply.
  
  
4. Electronic Voting Machine
   
   
• Description: A simplified voting machine using keypad and LCD display.
  
  
• Tools: Arduino Uno, keypad, 16x2 LCD, 74HC595 IC, power supply.
  
  
5. Digital Voltmeter using Arduino
   
   
• Description: Displays voltage on LCD using Arduino’s ADC.
  
  
• Tools: Arduino Uno, 16x2 LCD, resistors, potentiometer, power supply.
  
  

Category 6: Microcontroller & PCB Design

1. LED Chaser/Knight Rider
   
   
• Description: Sequential lighting effect with LEDs controlled by Arduino.
  
  
• Tools: Arduino Uno, LEDs, resistors, breadboard, power supply.
  
  
2. Mini Audio Amplifier
   
   
• Description: Amplifies audio signals using LM386 IC.
  
  
• Tools: LM386 IC, capacitor, resistor, speaker, 9V battery.
  
  
3. PCB Designing for a Simple Circuit
   
   
• Description: Designing and fabricating a PCB for simple circuits.
  
  
• Tools: KiCad/EAGLE software, Ferric Chloride, PC, printer.
  
  
4. Traffic Light Controller
   
   
• Description: Simulates a traffic light system using LEDs and Arduino.
  
  
• Tools: Arduino Uno, LEDs, resistors, power supply.
  
  
5. Digital Password-based Lock System
   
   
• Description: Unlocks using correct password entered via keypad.
  
  
• Tools: Arduino Uno, keypad, LCD display, relay, power supply.
  
  

Category 7: Miscellaneous & Innovative

1. RFID-based Attendance System
   
   
• Description: Automated attendance using RFID cards.
  
  
• Tools: Arduino Uno, RC522 RFID reader, RFID cards, LCD, power supply.
  
  
2. Smart Parking System
   
   
• Description: Detects parking slot availability and displays on LCD.
  
  
• Tools: Arduino Uno, IR/ultrasonic sensors, LCD display, power supply.
  
  
3. Mini Radar System
   
   
• Description: Uses servo + ultrasonic sensor to detect objects and display on PC.
  
  
• Tools: Arduino Uno, HC-SR04, servo, PC, Processing IDE.
  
  
4. Portable Cell Phone Jammer
   
   
• Description: Emits RF noise to block signals (for education only).
  
  
• Tools: 555 timer IC, RF transistor, antenna, resistors, capacitors.
  
  
5. Early Flood Detection System
   
   
• Description: Detects rising water and sends alerts via GSM.
  
  
• Tools: Arduino Uno, water sensor, buzzer, GSM module, power supply.
  
  
6. Fire Alarm with Gas Leak Detection
   
   
• Description: Detects fire and gas leaks, triggers alarm.
  
  
• Tools: Arduino Uno, flame sensor, MQ-2 gas sensor, buzzer, power supply.
  
  
7. Security System with Intruder Detection
   
   
• Description: Detects intruders with PIR/IR sensor and triggers alarm.
  
  
• Tools: Arduino Uno, PIR/IR sensor, buzzer, LCD, power supply.
  
  
8. Mini Weather Station
   
   
• Description: Measures temperature, humidity, and pressure.
  
  
• Tools: Arduino Uno, BME280 sensor, LCD, power supply.
  
  
9. Automatic Plant Watering System
   
   
• Description: Uses soil moisture sensor to water plants automatically.
  
  
• Tools: Arduino Uno, soil moisture sensor, relay, pump, power supply.
  
  
10. Solar Tracker System
    
    
• Description: Tracks sunlight using LDRs to rotate solar panel.
  
  
• Tools: Arduino Uno, LDRs, servo motor, solar panel, power supply.
  
  
11. Automatic Toll Booth System
    
    
• Description: Opens barrier using IR sensor detection.
  
  
• Tools: Arduino Uno, IR sensors, servo motor, LCD, power supply.
  
  
12. Speed Checker for Vehicles
    
    
• Description: Measures vehicle speed using IR sensors.
  
  
• Tools: Arduino Uno, IR sensors, LCD display, power supply.
  
  
13. Vehicle Accident Alert System
    
    
• Description: Detects accidents and sends SMS with GPS location.
  
  
• Tools: Arduino Uno, accelerometer, GPS module, GSM module.
  
  
14. Wireless Mobile Phone Charger
    
    
• Description: Wireless charging via electromagnetic induction.
  
  
• Tools: NE555 IC, transistor, copper coils, diode, power supply.
  
  
15. Smart Helmet for Bike Riders
    
    
• Description: Prevents bike ignition if alcohol is detected, includes accident detection.
  
  
• Tools: Arduino Uno, alcohol sensor, vibration sensor, relay, power supply.
  
  
16. Color Sensor-based Sorting Robot
    
    
• Description: Sorts objects by color using robotic arm.
  
  
• Tools: Arduino Uno, TCS3200 color sensor, servo motors, chassis.
  
  
17. Electronic Voting Machine with Biometrics
    
    
• Description: Voting system with fingerprint authentication.
  
  
• Tools: Arduino Uno, fingerprint sensor, LCD, keypad, power supply.
  
  
18. GSM-based Patient Health Monitoring
    
    
• Description: Monitors heart rate and temperature, sends SMS updates.
  
  
• Tools: Arduino Uno, MAX30100 heart sensor, DS18B20 temperature sensor, GSM module.
  
  
19. Robotic Arm Controlled by PC
    
    
• Description: PC GUI controls robotic arm motors.
  
  
• Tools: Arduino Uno, servo motors, chassis, PC, Python Tkinter.
  
  
20. Automatic LPG Gas Leakage Detector
    
    
• Description: Detects LPG leaks and alerts via buzzer or SMS.
  
  
• Tools: Arduino Uno, MQ-2 gas sensor, buzzer, GSM module.
  
  
21. Light-following Robot
    
    
• Description: Moves toward a light source using LDRs.
  
  
• Tools: Arduino Uno, LDRs, DC motors, motor driver, chassis.
  
  
22. Simple Audio VU Meter with LEDs
    
    
• Description: Visualizes audio signal strength with LEDs.
  
  
• Tools: Arduino Uno, microphone, LEDs, resistors.
  
  
23. Simple Metal Detector Circuit
    
    
• Description: Detects metal objects using electromagnetic induction.
  
  
• Tools: NE555 timer IC, coil, capacitor, buzzer, power supply.
  
  
24. GPS-based Vehicle Tracking System
    
    
• Description: Tracks real-time vehicle location via SMS or cloud.
  
  
• Tools: Arduino Uno, GPS module, GSM module, power supply.
  
  
25. Wireless Electronic Notice Board
    
    
• Description: Updates digital display wirelessly via Bluetooth or Wi-Fi.
  
  
• Tools: Arduino Uno, LED/LCD display, HC-05 Bluetooth, PC/mobile.