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Building a data logger using Arduino and SD card is so easy, this topic shows how to build a simple temperature and humidity data logger with DHT11 sensor. 

The DHT11 sensor is used to sense the relative humidity and temperature and the SD card is used to save the values of the humidity and the temperature every 1 second. The values of the temperature and humidity are saved in .TXT file which is stored in the SD card.

Related projects:
Arduino and SD card interfacing example
Arduino and SD card example – Read and write files
Arduino interfacing with DHT11 sensor and LCD

In this article, you are going to learn about Arduino SD card data logging. We will use the LM35 temperature sensor to get the temperature value, and the DS3231 module to get the time and date. Then we will use the SD card module to open the SD card, and we will enter the date, time, and temperature in the SD card file.