Lesson 6: Building a Simple IoT Project

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Learning Objectives

By the end of this lesson, you will be able to:

  • Select and plan a small IoT Project Idea.

  • Assemble the required components in Tinkercad or using real hardware.

  • Write and test Arduino Code to make the project work.

  • Troubleshoot and refine their IoT Design.

Lesson Overview

In this lesson, you will combine everything learned in Lessons 4–5 understanding Arduino, actuators, and sensors, to create your own working IoT mini-project.

You’ll choose one project from the list below, build it in Tinkercad Circuits (or with real components if available), and test your design.

Mini-Project Options

1. Smart Night Light (Light Sensor + LED)

Goal: The LED automatically turns on when the environment is dark and turns off when it’s bright.
Real-World Use: Used in streetlights, garden lights, or hallway night lights.

Components Needed:

  • Arduino Uno

  • Light sensor (LDR)

  • LED

  • Resistor (220Ω for LED, 10kΩ for LDR)

  • Jumper wires

Circuit Connection

Program Code

2. Door Alarm (Motion Sensor + Buzzer)

Goal: The buzzer sounds when motion is detected, such as when someone enters a room.
Real-World Use: Home security alarms, shop entry alerts, and motion-activated warnings.

Components Needed:

  • Arduino Uno

  • PIR motion sensor

  • Buzzer

  • Jumper wires

Circuit Connection

Program Code

3. Plant Moisture Alert (Moisture Sensor + LED or Buzzer)

Goal: Alerts the user when the soil is too dry by lighting an LED or sounding a buzzer.
Real-World Use: Used in home gardens, farms, and greenhouse automation.

Components Needed:

  • Arduino Uno

  • Soil moisture sensor

  • LED or buzzer

  • Resistor (220Ω for LED)

  • Jumper wires

Circuit Connection

Program Code

Activity Instructions

  1. Choose Your Project – Decide which mini-project you want to build.

  2. Plan Your Circuit – Draw a simple circuit diagram with all components.

  3. Build in Tinkercad – Place the components on the workspace and wire them correctly.

  4. Write Your Code – Program the Arduino to read the sensor data and control the output.

  5. Test & Debug – Run the simulation, check if it works, and fix any errors.

  6. Demonstrate Your Project – Explain how it works and where it can be used in real life.

Expected Outcomes

  • Smart Night Light: LED responds to changes in light level.

  • Door Alarm: Buzzer activates when movement is detected.

  • Plant Moisture Alert: LED or buzzer warns when soil is dry.

Learning Reflection

By completing this project, you will have:

  • Applied real IoT principles (sensor → Arduino → actuator).

  • Strengthened your coding and circuit design skills.

  • Learned how to test, debug, and improve your IoT creations.




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