OpenLog Open Source Serial Data Logger with microSD up to 64GB
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Prices updated: 13 Oct 2026
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About this product
OpenLog is an open-source data logger that records serial data to a microSD card, with cards up to 64GB supported. Built around an ATmega328 running at 16 MHz, it can act as a black box for projects, capturing debugging or scientific data. Its simple serial interface makes it easy to add to Arduino and other microcontroller projects.
Specifications
- Microcontroller
- ATmega328 at 16 MHz
- Storage
- microSD up to 64 GB
- Interface
- Serial
- Current draw
- About 6 mA while recording (512-byte buffer)
Frequently asked questions
Can OpenLog keep up with a fast serial data stream?
Yes, the listing indicates it can record a constant data stream at 115200 bps, in which case the current draw approaches 6 mA.
Do I need a computer to read the logged data?
No. Data is stored on the microSD card, so you can remove the card and read the files on a computer.
