OpenLog is an open source data logger. Simple to use, simple to change. We wanted to create a serial logger that just worked. Power this device up and it will start logging any received serial data at 9600bps. Sending Ctrl+z 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:
That's really it! OpenLog firmware is open source and is based on Roland Riegel's FAT library. OpenLog currently supports FAT16 (upto 2GB microSD cards). We're working on FAT32 and would love your help!
All the design files (schematic, PCB layout, firmware) are open source released under the CC-SA v3 license and are available through Github.
- Log to low-cost microSD cards up to 2GB
- Simple command interface
- 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
- Configurable baud rates (2400 to 115200bps)
- Doesn't drop characters even at full-blast 115200bps
- Power, ground, and RX-I are the minimum connections
- Reprogrammable ATmega328 using the standard STK500 serial bootloader
- Two LEDs indicate writing status
- Input voltage from 3.3V to 12V
- 8mA idle, 18mA at maximum recording rate
Dimensions: 0.16 x 0.6 x 0.75" (4 x 15 x 19mm)
The OpenLog project is housed on github! Please see the wiki for the most up-to-date firmware, feature requests, files, and datasheet specs.