The SparkFun OpenLog is an open source data logger that works over a simple serial connection and supports microSD cards up to 64GB.
The OpenLog can store or “log” huge amounts of serial data and act as a black box of sorts to store all the serial data that your project generates, for scientific or debugging purposes.
The SparkFun OpenLog runs off of an onboard ATmega328, running at 16MHz thanks to the onboard crystal.The OpenLog draws 6mA when recording a 512 byte buffer, but as that process takes a fraction of a second, the average current draw is closer to 5mA. Keep in mind though that if you are recording a constant data stream at 115200bps, you will approach that 6mA limit. All data logged by the OpenLog is stored on the microSD card that involve the features of 64MB to 64GB capacity and FAT16 or FAT32 file type.
Note: The latest version of the firmware (included with this board) does not compile in Arduino 1.6.7. You will need to compile in 1.6.5.
Features:
- VCC Input: 3.3V-12V (Recommended 3.3V-5V)
- Log to low-cost microSD FAT16/32 cards up to 64GB
- Simple command interface
- Configurable baud rates (up to 115200bps)
- Preprogrammed ATmega328 and bootloader
- Four SPI pogo pins
- Two LEDs indicate writing status
- 2mA idle, 6mA at maximum recording rate
Documents:
- Schematic
- Eagle Files
- Hookup Guide
- Github
- Microbitsandbobs have written a fine tutorial on logging data from the BBC Micro:bit
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