ADC conversion process (sample and hold) in Embedded C - Mini Project: Build & Apply

ADC Conversion Process (Sample and Hold)

📖 Scenario: You are working with a microcontroller that reads analog signals using an ADC (Analog to Digital Converter). To get accurate readings, the ADC uses a sample and hold process. This means it first samples the voltage and holds it steady before converting it to a digital value.

🎯 Goal: Build a simple C program that simulates the ADC conversion process with sample and hold. You will create variables to hold the analog input, a flag for sample and hold, perform the conversion, and then print the digital result.

📋 What You'll Learn

Create a variable analog_input with the exact value 512 to simulate the analog voltage.

Create a variable sample_and_hold and set it to 1 to indicate the sample and hold is active.

Write code to convert analog_input to digital_output by simulating a 10-bit ADC conversion (value remains the same here).

Print the digital_output value using printf.

💡 Why This Matters

🌍 Real World

Microcontrollers use ADCs to read sensors like temperature or light. Sample and hold ensures the reading is stable before conversion.

💼 Career

Embedded software engineers often write code to control ADCs and process sensor data accurately.

1

Create the analog input variable

Create an integer variable called analog_input and set it to 512 to simulate the analog voltage input.

Embedded C

// Create an integer variable called analog_input and set it to 512
// Your code here

Need a hint?

Use int analog_input = 512; to create the variable.

2

Add the sample and hold flag

Create an integer variable called sample_and_hold and set it to 1 to indicate the sample and hold process is active.

Embedded C

int analog_input = 512;
// Create an integer variable called sample_and_hold and set it to 1
// Your code here

Need a hint?

Use int sample_and_hold = 1; to create the flag variable.

3

Simulate ADC conversion

Create an integer variable called digital_output and set it equal to analog_input to simulate the ADC conversion output.

Embedded C

int analog_input = 512;
int sample_and_hold = 1;
// Create an integer variable digital_output and set it equal to analog_input
// Your code here

Need a hint?

Assign digital_output the value of analog_input.

4

Print the digital output

Use printf to print the value of digital_output with the exact format: "Digital output: %d\n".

Embedded C

int analog_input = 512;
int sample_and_hold = 1;
int digital_output = analog_input;
// Print the digital_output value
// Your code here

Need a hint?

Use printf("Digital output: %d\n", digital_output); inside main().