{"title":"SparkFun OpenLog","handle":"sparkfun-openlog","url":"/products/sparkfun-openlog","description":"The SparkFun OpenLog is an open-source serial data logger based on the ATmega328 running at 16 MHz. It logs incoming serial data directly to a microSD card, supporting cards from 64 MB to 64 GB in FAT16 or FAT32 format. Simply connect a serial line from your project to the OpenLog, and all transmitted data is stored to the card as text files.\n\nThe OpenLog draws approximately 5 mA on average, rising to around 6 mA when actively writing a 512-byte buffer. It supports configurable baud rates and is well suited for long-term data acquisition, debugging, and any application where a record of serial output is needed.\n\nKey Features\n\n\nSimple Serial Interface – Connect via serial TX/RX to log data automatically\n\nmicroSD Storage – Supports 64 MB to 64 GB cards (FAT16/FAT32)\n\nATmega328 Processor – 16 MHz with open-source firmware\n\nLow Power – Approximately 5–6 mA during operation\n\nConfigurable Baud Rate – Adjustable via configuration file on the SD card\n\nAutomatic File Creation – Creates new log files on each power cycle\n\n\nSpecifications\n\n\nMicrocontroller – ATmega328 at 16 MHz\n\nStorage – microSD (64 MB – 64 GB, FAT16/FAT32)\n\nCurrent Draw – ~5 mA average, ~6 mA peak (during write)\n\nDefault Baud Rate – 9600 bps (configurable)\n\nLogic Level – 3.3 V\n\n\nIdeal For\n\nSerial data logging and scientific data acquisition\nDebugging and black-box recording of project output\nRemote or unattended sensor data collection\nFlight data recorders and environmental monitoring\n\n\nPackage Contents\n\n1× SparkFun OpenLog\n\n\nResources\n\nHookup Guide (SparkFun)\nGitHub Repository\n","vendor":"SparkFun","product_type":"physical","in_stock":true,"options":[],"variants":[{"id":11448,"title":"Default Title","sku":"SF-DEV-13712","price":35.13,"compare_at_price":0.0,"on_sale":false,"in_stock":true,"available_quantity":414,"option1":"Default Title"}]}