SparkFun OpenLog

OpenLog is an open-source data logger. It is easy to use and customizable. We wanted to create a serial logger that simply works: power it on, and the logger starts logging. With three Ctrl-Zs, you switch from logging mode to command mode. 'new' creates a new file, 'md' creates a directory, and '?' brings up help. OpenLog doesn't do much, but it logs serial streams very flexibly. Example: >new testfile.txt >append testfile.txt <(send a large text with three trailing Ctrl-Zs). That's it. The OpenLog firmware is open source and is based on Bill Greiman's sdfatlib. OpenLog supports FAT16 and FAT32 microSD cards, tested up to 64GB. A new firmware with Arduino 1.6.5 support and support for faster baud rates is available.

Features:

• Logging on inexpensive microSD FAT16/32 cards up to 64GB
• Simple command interface
• Three modes:
• NewLog creates a new log on every power-on and immediately starts logging
• SeqLog appends to the file "SeqLog.txt" on every power-on and immediately starts logging
• Command starts the OpenLog in command mode
• Adjustable baud rates up to 115200bps
• Configurable via a config.txt on the microSD card or through a menu system
• Power, Ground, and RX-I must be connected at a minimum
• The ATmega328 can be reprogrammed with the Arduino IDE
• Two status LEDs
• Input voltage from 3.3V to 12V
• 2mA idle; 6mA maximum consumption
• Size: 5 x 15 x 19mm.