In this lesson, we learn how to use a Micro SD card. We learn how to write to the card and how to read text. How to log voltage from a potentiometer to the memory card. How to save the data as CSV format so we can open it in a spreadsheet like Excel for plotting and other analysis.

This is Example 5. We simply read the voltage from a potentiometer, and when a push button is pressed, the data from the Micro SD card is displayed on the serial monitor. The data written to the microSD card is written in CSV format so we can open it using a spreadsheet like Excel.