Multiple sensor fusion in Arduino - Mini Project: Build & Apply

Multiple sensor fusion

📖 Scenario: You are building a simple Arduino project that reads data from two sensors: a temperature sensor and a light sensor. You want to combine their readings to decide if the environment is comfortable.

🎯 Goal: Create an Arduino program that reads values from a temperature sensor and a light sensor, then fuses these readings to determine if the environment is comfortable based on given thresholds.

📋 What You'll Learn

Create variables to store temperature and light sensor readings.

Set threshold values for temperature and light to define comfort.

Use an if-else statement to fuse sensor data and decide comfort.

Print the comfort status to the Serial Monitor.

💡 Why This Matters

🌍 Real World

Combining multiple sensor readings helps devices make better decisions, like smart thermostats or lighting systems.

💼 Career

Understanding sensor fusion is useful for embedded systems engineers and IoT developers working with hardware.

1

Setup sensor variables

Create two integer variables called temperature and light and set them to 25 and 300 respectively.

Arduino

# Create two integer variables called temperature and light and set them to 25 and 300 respectively
// Your code here

Need a hint?

Use int to declare integer variables and assign the exact values.

2

Set comfort thresholds

Create two integer variables called tempThreshold and lightThreshold and set them to 22 and 250 respectively.

Arduino

int temperature = 25;
int light = 300;
// Create two integer variables called tempThreshold and lightThreshold and set them to 22 and 250 respectively
// Your code here

Need a hint?

Thresholds help decide if the environment is comfortable.

3

Fuse sensor data with if-else

Write an if statement that checks if temperature is greater than tempThreshold and light is greater than lightThreshold. Inside the if, create a string variable status and set it to "Comfortable". Otherwise, set status to "Not Comfortable".

Arduino

int temperature = 25;
int light = 300;
int tempThreshold = 22;
int lightThreshold = 250;
// Use if-else to set status based on temperature and light thresholds
// Your code here

Need a hint?

Use && to combine conditions and assign status inside the if and else blocks.

4

Print the comfort status

Add Serial.begin(9600); in setup() and write Serial.println(status); inside loop() to print the comfort status.

Arduino

int temperature = 25;
int light = 300;
int tempThreshold = 22;
int lightThreshold = 250;

String status;
if (temperature > tempThreshold && light > lightThreshold) {
  status = "Comfortable";
} else {
  status = "Not Comfortable";
}

void setup() {
  // Initialize serial communication
  // Your code here
}

void loop() {
  // Print the status
  // Your code here
}

Need a hint?

Use Serial.begin(9600); in setup() and Serial.println(status); in loop(). Add delay(1000); to slow printing.