UNIT – 5: Application of IoT

 UNIT – 5: Application of IoT

1. Smart Home Automation

  • Devices: Sensors (temperature, motion), Actuators (lights, fans).

  • Central controller (like Arduino/Raspberry Pi).

  • Applications: Lighting control, Smart locks, Security cameras.

2. Agricultural System

  • Soil moisture sensors, DHT sensors, Water pumps.

  • Automatic irrigation based on soil moisture.

  • Improves crop yield & saves water.

3. Smart Parking

  • Ultrasonic sensors detect vehicle presence.

  • Central system updates availability in real-time.

  • Mobile app displays parking status.

Short Questions – UNIT 5

  1. Which IoT application uses soil moisture sensors?
    👉 Smart Agriculture.

  2. What is the role of ultrasonic sensor in smart parking?
    👉 To detect car presence.

MCQs – UNIT 5

  1. In smart home automation, which device is mainly used for switching appliances?
    a) Relay ✅
    b) Sensor
    c) Stepper Motor
    d) Transistor

  2. Smart agriculture improves:
    a) Internet speed
    b) Crop yield ✅
    c) Car parking
    d) Entertainment

  3. Which IoT application helps in reducing traffic?
    a) Smart Agriculture
    b) Smart Parking ✅
    c) Smart Home
    d) Smart Health


UNIT – 5: Application of IoT

1. Explain the block diagram of smart home automation.

Answer:

  • Sensors: PIR, LDR, temperature.

  • Controller: Arduino/Raspberry Pi.

  • Communication: Wi-Fi/Bluetooth.

  • Actuators: Relays for lights/fans.

  • Cloud/Mobile App: Remote monitoring.

2. Explain working of IoT-based smart lighting system.

Answer:

  • LDR detects ambient light.

  • If light < threshold → microcontroller switches ON lights via relay.

  • Can be controlled by mobile app through Wi-Fi.

3. Explain IoT-based smart door lock with relay.

Answer:

  • User sends unlock command via mobile app.

  • Controller triggers a relay connected to solenoid lock.

  • Door unlocks remotely.

4. Explain IoT-based smart agriculture system.

Answer:

  • Sensors: Soil moisture, temperature, humidity.

  • If soil moisture < threshold → water pump ON.

  • Controlled via smartphone/cloud.

5. Explain soil moisture-based irrigation control.

Answer:

  • Soil moisture sensor detects water level in soil.

  • If dry → motor ON automatically.

  • Saves water and reduces human effort.

6. Explain temperature and humidity monitoring system.

Answer:

  • DHT11/DHT22 measures temperature and humidity.

  • Data sent to cloud/mobile app.

  • Useful in weather stations, greenhouses.

7. Explain IoT-based smart greenhouse.

Answer:

  • Sensors monitor humidity, temperature, CO₂ levels.

  • Automated fans, sprinklers, and lights maintain ideal conditions.

  • Controlled remotely via cloud.

8. Explain IoT-based smart parking system with diagram.

Answer:

  • Ultrasonic sensors detect car presence.

  • Central system updates database.

  • Mobile app shows available parking slots.

9. Explain how ultrasonic sensors are used in parking systems.

Answer:

  • Sensor emits ultrasonic waves.

  • If car present → echo received quickly.

  • Microcontroller updates parking availability.

10. Explain IoT in traffic management.

Answer:

  • IoT cameras & sensors monitor traffic density.

  • Smart signals adjust timing automatically.

  • Helps reduce congestion.

11. Explain IoT for healthcare applications.

Answer:

  • Wearable devices (smart bands) track heart rate, BP, SpO₂.

  • Data sent to doctor’s system via cloud.

  • Helps in remote patient monitoring.

12. Explain smart city applications of IoT.

Answer:

  • Smart street lights

  • Smart waste management

  • Traffic monitoring

  • Air quality monitoring

13. Explain IoT in industrial automation.

Answer:

  • Sensors monitor machine vibration, temperature, production rates.

  • Alerts sent before failure (predictive maintenance).

  • Increases efficiency.

14. Explain challenges in IoT applications.

Answer:

  • Security and privacy issues

  • High implementation cost

  • Power management for IoT devices

  • Scalability challenges

15. Explain integration of IoT applications with cloud computing.

Answer:

  • IoT devices generate massive data.

  • Cloud provides storage, processing, and analytics.

  • Example: Smart home devices upload data to AWS IoT, users monitor via mobile app.

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