---
product_id: 565790052
title: "OpenLog Open-source data logger works over a simple serial connection Supports microSD FAT16/32 cards up to 32GB Configurable baud rates up to 115200bps Preprogrammed ATmega328 and bootloader"
brand: "sparkfun"
price: "€ 35.25"
currency: EUR
in_stock: true
reviews_count: 5
url: https://www.desertcart.de/products/565790052-openlog-open-source-data-logger-works-over-a-simple-serial
store_origin: DE
region: Germany
---

# Configurable baud rates up to 115200bps Supports up to 32GB microSD Ultra-low 2mA idle power consumption OpenLog Open-source data logger works over a simple serial connection Supports microSD FAT16/32 cards up to 32GB Configurable baud rates up to 115200bps Preprogrammed ATmega328 and bootloader

**Brand:** sparkfun
**Price:** € 35.25
**Availability:** ✅ In Stock

## Summary

> 💡 Capture every byte, never miss a beat.

## Quick Answers

- **What is this?** OpenLog Open-source data logger works over a simple serial connection Supports microSD FAT16/32 cards up to 32GB Configurable baud rates up to 115200bps Preprogrammed ATmega328 and bootloader by sparkfun
- **How much does it cost?** € 35.25 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.de](https://www.desertcart.de/products/565790052-openlog-open-source-data-logger-works-over-a-simple-serial)

## Best For

- sparkfun enthusiasts

## Why This Product

- Trusted sparkfun brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Robust & Reliable:** Dual LEDs and SPI pogo pins provide clear status and secure connections for professional-grade logging.
- • **Massive Data Storage:** Log up to 32GB of serial data seamlessly with FAT16/32 support.
- • **Plug & Play Simplicity:** Preprogrammed ATmega328 with Optiboot bootloader for instant Arduino IDE compatibility.
- • **Power-Efficient Design:** Consumes just 2mA when idle, maximizing battery life for long-term projects.
- • **Lightning-Fast Transfer:** Configurable baud rates up to 115200bps ensure real-time data capture without lag.

## Overview

The SparkFun OpenLog is a compact, open-source serial data logger powered by an onboard ATmega328 running at 16MHz. It supports microSD cards up to 32GB with FAT16/32 formatting, configurable baud rates up to 115200bps, and ultra-low power consumption (2mA idle). Designed for seamless Arduino IDE integration via the Optiboot bootloader, it offers a simple command interface, status LEDs, and SPI pogo pins, making it the perfect black box for scientific data capture and debugging in professional projects.

## Description

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 ATmega328 has the Optiboot bootloader loaded on it, which allows the OpenLog to be compatible with the "Arduino Uno" board setting in the Arduino IDE.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.The primary interface with the OpenLog is the FTDI header on the board edge. This header is designed to plug directly into an Arduino Pro or Pro Mini, which allows the microcontroller to send the data over a serial connection to the OpenLog.

Review: Awsome
Review: This is a great little device for logging serial output from a microcontroller. Just connect to the UART and it's preprogrammed to record output. I'm using it to record sensor output to an SD card. The firmware can be customized as needed, but I just used the firmware it shipped with.

## Features

- Store huge amounts of data from your project any 512MB to 32GB microSD card should work.
- Power input: 3.3V-12V (Recommended 3.3V-5V). Power expenditure of 2mA idle, 23mA at maximum recording rate.
- Simple command interface. Includes four SPI pogo pins, two LEDs that indicate writing status.
- Runs off of an onboard ATmega328 at 16MHz thanks to the onboard resonator. Has the Optiboot bootloader.
- Acts as a black box to store all the serial data from your project, for scientific or debugging purposes.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B079LPZ4YD |
| Best Sellers Rank | #29,329 in Computers ( See Top 100 in Computers ) #350 in Single-Board Computers |
| Item model number | SparkFun OpenLog |
| Manufacturer | SparkFun Electronics |
| Product Dimensions | 9 x 5 x 0.4 cm; 6 g |

## Product Details

- **Brand:** SparkFun
- **Compatible devices:** Arduino Uno compatible devices
- **Format:** MP3 Audio
- **Hardware interface:** MicroSD
- **Microphone form factor:** Built-In

## Images

![OpenLog Open-source data logger works over a simple serial connection Supports microSD FAT16/32 cards up to 32GB Configurable baud rates up to 115200bps Preprogrammed ATmega328 and bootloader - Image 1](https://m.media-amazon.com/images/I/61VMo1BlyKL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by B***N on 22 April 2025*

Awsome

### ⭐⭐⭐⭐⭐ Review
*by C***R on 11 October 2023*

This is a great little device for logging serial output from a microcontroller. Just connect to the UART and it's preprogrammed to record output. I'm using it to record sensor output to an SD card. The firmware can be customized as needed, but I just used the firmware it shipped with.

### ⭐ Review
*by J***W on 13 November 2019*

The logger is great when it works, however the mechanism that holds the SD card in place is extremely fragile and does not last long, I've ordered more than 10 over the past couple of weeks and every single one broke within a couple of days of continuous use. Can not recommend.

## Frequently Bought Together

- SparkFun OpenLog Open-source data logger works over a simple serial connection Supports microSD FAT16/32 cards up to 32GB Configurable baud rates up to 115200bps Preprogrammed ATmega328 and bootloader
- Lexar 32GB Micro SD Card 3 Pack, microSDHC UHS-I Flash Memory Card with Adapter - Up to 100MB/s, U1, Class10, V10, A1, High Speed TF Card (3 microSD Cards + 1 Adapter)

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*Product available on Desertcart Germany*
*Store origin: DE*
*Last updated: 2026-02-26*