Sensor reading through ADC (temperature, light) in Embedded C - Mini Project: Build & Apply

Sensor reading through ADC (temperature, light)

📖 Scenario: You are working on a small embedded system that reads sensor values from two sensors: a temperature sensor and a light sensor. Both sensors send analog signals to the microcontroller's ADC (Analog to Digital Converter). Your task is to write a simple program that reads these ADC values and stores them for further processing.

🎯 Goal: Build a program that initializes two variables to hold ADC readings from temperature and light sensors, sets a maximum ADC value for reference, reads the ADC values using a loop, and then prints the results.

📋 What You'll Learn

Create two integer variables named temp_adc and light_adc to store ADC readings.

Create an integer variable named max_adc_value and set it to 1023 (10-bit ADC max).

Use a for loop with variable i to simulate reading ADC values for both sensors.

Print the ADC values of temp_adc and light_adc.

💡 Why This Matters

🌍 Real World

Reading sensor values through ADC is common in embedded systems like weather stations, smart home devices, and robotics.

💼 Career

Embedded developers often write code to read and process sensor data using ADCs to build responsive and accurate hardware systems.

1

Create ADC reading variables

Create two integer variables called temp_adc and light_adc and initialize both to 0.

Embedded C

# Create two integer variables temp_adc and light_adc and set them to 0
# Your code here

Need a hint?

Use int to declare variables and set both to 0.

2

Set maximum ADC value

Create an integer variable called max_adc_value and set it to 1023.

Embedded C

int temp_adc = 0;
int light_adc = 0;

// Create max_adc_value and set it to 1023
# Your code here

Need a hint?

1023 is the maximum value for a 10-bit ADC.

3

Simulate ADC readings with a loop

Use a for loop with variable i from 0 to 1 to simulate reading ADC values. Inside the loop, if i is 0, set temp_adc to 512; if i is 1, set light_adc to 256.

Embedded C

int temp_adc = 0;
int light_adc = 0;
int max_adc_value = 1023;

// Use for loop to assign ADC values
# Your code here

Need a hint?

Use for loop and if statements to assign values.

4

Print ADC readings

Use printf to print the values of temp_adc and light_adc in the format: "Temperature ADC: 512\nLight ADC: 256\n".

Embedded C

int temp_adc = 0;
int light_adc = 0;
int max_adc_value = 1023;

for (int i = 0; i <= 1; i++) {
    if (i == 0) {
        temp_adc = 512;
    } else if (i == 1) {
        light_adc = 256;
    }
}

// Print the ADC values
# Your code here

Need a hint?

Use printf with %d to print integers and include newline \n.