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Open Log

Description

OpenLog

OpenLog is an open source data logger. Simple to use, simple to change. We wanted to create a serial logger that just worked. Power up this device and it will start logging any received serial data at 9600bps. Sending Ctrl+z three times will drop out of logging and in to command mode. 'new' will create a new file. 'md' makes a directory. '?' brings up the list of commands. OpenLog doesn't do a lot, but it does log serial streams extremely well.

Example:

>new testfile.txt
>append testfile.txt
<(send large amounts of text followed by three ctrl+z characters)

That's really it! OpenLog firmware is open source and is based on Bill Greiman's sdfatlib. OpenLog currently supports FAT16 and FAT32 microSD cards (we've tested up to 16GB!).

All the design files (schematic, PCB layout, firmware) are open source released under the CC-SA v3 license and are available through GitHub.

Features:

Log to low-cost microSD FAT16/32 cards up to 16GB
Simple command interface
Edit config.txt file from a computer to change baud rate and other system settings

Three modes:

NewLog creates a new log every power up and immediately starts logging
SeqLog appends a file called "SeqLog.txt" at every power up and immediately starts logging
Command mode starts OpenLog at a command prompt at power up