Why power management matters in Embedded C - See It in Action

Why power management matters

📖 Scenario: You are working on a small embedded device that runs on battery power. To make the battery last longer, you need to manage when the device uses power.

🎯 Goal: You will create a simple program that tracks the device's power usage and decides when to enter low power mode to save battery.

📋 What You'll Learn

Create a variable to store the current power usage in milliwatts

Create a threshold variable for low power mode activation

Use an if statement to check if power usage is above the threshold

Print a message indicating if the device should enter low power mode or stay active

💡 Why This Matters

🌍 Real World

Embedded devices like sensors, wearables, and IoT gadgets need to manage power carefully to extend battery life.

💼 Career

Understanding power management is important for embedded systems engineers and developers working on battery-powered devices.

1

Set up the current power usage variable

Create an integer variable called power_usage and set it to 120 to represent the current power usage in milliwatts.

Embedded C

# Create an integer variable called power_usage and set it to 120
# Your code here

Need a hint?

Use int power_usage = 120; to create the variable.

2

Add a low power threshold variable

Create an integer variable called low_power_threshold and set it to 100 to represent the power usage limit for entering low power mode.

Embedded C

int power_usage = 120;
// Create an integer variable called low_power_threshold and set it to 100
// Your code here

Need a hint?

Use int low_power_threshold = 100; to create the threshold variable.

3

Check if power usage is above the threshold

Write an if statement that checks if power_usage is greater than low_power_threshold. Inside the if, write a comment // Device should stay active. Add an else block with a comment // Device should enter low power mode.

Embedded C

int power_usage = 120;
int low_power_threshold = 100;
// Write an if statement to check if power_usage is greater than low_power_threshold
// Your code here

Need a hint?

Use if (power_usage > low_power_threshold) { ... } else { ... } with the comments inside.

4

Print the power management decision

Add printf statements inside the if and else blocks to print exactly these messages:
"Power usage is high: staying active.\n" inside the if, and
"Power usage is low: entering low power mode.\n" inside the else.

Embedded C

int power_usage = 120;
int low_power_threshold = 100;

if (power_usage > low_power_threshold) {
    // Add printf to show staying active message
    // Your code here
} else {
    // Add printf to show low power mode message
    // Your code here
}

Need a hint?

Use printf("Power usage is high: staying active.\n"); and printf("Power usage is low: entering low power mode.\n"); inside the correct blocks.