The Arduino SD card shield can be used to log data from sensors to be analysed later. In this project, the Arduino Datalogger was used to log readings from a PIR sensor anytime movement is detected. A PIR sensor is used to sense motion of human beings. This setup worked reliably well. It can be used in situations of tracking movements in a room. The code logs in the time (year, month, day, hour, minute, second) when the motion is detected. The SD card can simply be removed and the txt file opened to view the logged data. This is a great home monitoring/security solution, a casing in form of a box can be used to shield the Arduino and logger so it is not noticeable. Here is an excerpt of the Arduino code.
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