CSV format data logging in Arduino - Mini Project: Build & Apply

CSV Format Data Logging on Arduino

📖 Scenario: You are building a simple Arduino project that reads temperature and humidity from sensors and logs the data in CSV format to an SD card. This format helps you open the data easily in spreadsheet software later.

🎯 Goal: Create an Arduino sketch that initializes sensor readings, sets up CSV headers, logs sensor data in CSV format, and prints the logged data to the serial monitor.

📋 What You'll Learn

Create variables to hold temperature and humidity values

Create a string variable for the CSV header

Write a function to format sensor data as a CSV line

Print the CSV header and one line of sensor data to the serial monitor

💡 Why This Matters

🌍 Real World

Logging sensor data in CSV format is common in IoT and embedded systems to analyze data later on a computer.

💼 Career

Understanding how to format and log data properly is essential for roles involving embedded systems, IoT development, and data collection.

1

Setup sensor data variables

Create two float variables called temperature and humidity and set them to 23.5 and 60.2 respectively.

Arduino

# Your code here

Need a hint?

Use float type for decimal numbers and assign the exact values.

2

Create CSV header string

Create a String variable called csvHeader and set it to the exact value "Temperature,Humidity".

Arduino

float temperature = 23.5;
float humidity = 60.2;
// Your code here

Need a hint?

Use double quotes inside the string and exact capitalization.

3

Format sensor data as CSV line

Create a String variable called csvLine that combines temperature and humidity separated by a comma. Use String(temperature) and String(humidity) to convert floats to strings.

Arduino

float temperature = 23.5;
float humidity = 60.2;
String csvHeader = "Temperature,Humidity";
// Your code here

Need a hint?

Use the plus sign + to join strings and a comma inside quotes for CSV format.

4

Print CSV header and data line

Use Serial.begin(9600); in setup(). Then print csvHeader and csvLine each on a new line using Serial.println().

Arduino

float temperature = 23.5;
float humidity = 60.2;
String csvHeader = "Temperature,Humidity";
String csvLine = String(temperature) + "," + String(humidity);

void setup() {
  // Your code here
}

void loop() {
}

Need a hint?

Remember to start serial communication before printing. Use Serial.println() to print each line.