Computer Science
Grade 8
20 min
Building a Simple IoT Prototype
Build a simple IoT prototype using a microcontroller and sensors. Presentation of prototypes.
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1
Introduction & Learning Objectives
Learning Objectives
Define the Internet of Things (IoT) and identify its core components.
Distinguish between sensors and actuators and provide examples of each.
Describe the basic data flow in a simple IoT system, from device to cloud.
Outline the steps involved in prototyping a basic IoT solution.
Write simple code to read data from a sensor and control an actuator.
Explain the importance of connectivity in IoT applications.
Imagine your alarm clock knowing when you're awake, or your fridge telling you when you're out of milk! 🥛 How do everyday objects 'talk' to each other and to us?
In this chapter, we'll explore the exciting world of the Internet of Things (IoT) and learn how to build a simple prototype. You'll discover how devices collect...
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Key Concepts & Vocabulary
TermDefinitionExample
Internet of Things (IoT)A network of physical objects ('things') embedded with sensors, software, and other technologies for the purpose of connecting and exchanging data with other devices and systems over the internet.A smart doorbell that detects motion and sends a notification to your phone via the internet.
SensorA device that detects and responds to some type of input from the physical environment, converting physical phenomena into electrical signals.A temperature sensor (thermistor) that measures how hot or cold it is, or a light sensor (photoresistor) that measures brightness.
ActuatorA device that takes energy and converts it into motion or another physical action, often controlled by an electrical signal from a computer.An LED (Light Emitting Dio...
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Core Syntax & Patterns
The Sensor-Actuator Loop
Sense -> Process -> Act
This fundamental pattern describes how most IoT devices operate: they first 'sense' or collect data from their environment using sensors, then 'process' that data (e.g., compare it to a threshold) using a microcontroller, and finally 'act' upon the environment using an actuator based on the processed data.
Basic IoT Data Flow
Device -> Connectivity -> Cloud/Server -> Application/User
This rule outlines the path data typically takes in an IoT system. Data originates from a 'device' (with sensors), is sent via 'connectivity' (like Wi-Fi) to a 'cloud' server for storage and analysis, and then accessed by an 'application' or 'user' (e.g....
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Challenging
You want to build an IoT prototype for an automated plant watering system. The system should water a plant only when the soil is dry. Which set of components and logic correctly matches this goal?
A.Sensor: Water pump, Actuator: Soil moisture sensor, Logic: IF water level is high THEN turn on sensor.
B.Sensor: Temperature sensor, Actuator: Water pump, Logic: IF temperature is high THEN turn on pump.
C.Sensor: Soil moisture sensor, Actuator: Water pump, Logic: IF moisture is low THEN turn on pump.
D.Sensor: Soil moisture sensor, Actuator: LED light, Logic: IF moisture is low THEN turn on light.
Challenging
A student's IoT project is completely unresponsive. They've written the code and connected the components. Based on the tutorial's pitfalls, what is the most effective troubleshooting sequence?
A.1. Check data type conversions, 2. Check `setup()` initialization, 3. Check wiring.
B.1. Check wiring (power, ground, data), 2. Check `setup()` initialization, 3. Check logic in the `loop()`.
C.1. Check logic in the `loop()`, 2. Check wiring, 3. Check power requirements.
D.1. Check power requirements, 2. Check data type conversions, 3. Check wiring.
Challenging
To modify the 'Light-Controlled LED' project so the LED *blinks* when it's dark instead of just staying on, what change is necessary?
A.Replace the light sensor with a motion sensor.
B.Change the LED's data type from `int` to `float`.
C.Inside the `IF` block, add code to turn the LED on, wait, turn it off, and wait again.
D.Connect the LED to an analog pin instead of a digital pin.
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