Micro SD Sensor

Gives an Arduino a filesystem so it can log readings to a CSV file, store configuration, or read data files. Uses the standard SD library, so writing a line of data looks much like printing to the serial monitor. The onboard regulator and level shifter protect the 3.3V card from an Arduino's 5V signals — a detail cheaper modules omit, and the usual reason cards get corrupted. Format cards as FAT32 before first use. Onboard level shifting protects the card from 5V logic; Standard Arduino SD library, minimal code; Weeks of logging on an ordinary card; Files open directly on any computer