---
product_id: 145534095
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: "€ 29.18"
currency: EUR
in_stock: true
reviews_count: 8
url: https://www.desertcart.pt/products/145534095-openlog-open-source-data-logger-works-over-a-simple-serial
store_origin: PT
region: Portugal
---

# 115200bps max baud rate 32GB microSD support 3.3V-12V flexible input 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:** € 29.18
**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?** € 29.18 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.pt](https://www.desertcart.pt/products/145534095-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

- • **Massive Storage Ready:** Log up to 32GB of data seamlessly with FAT16/32 microSD compatibility.
- • **Power Smart Recording:** Ultra-low 2mA idle current saves energy when not logging, spikes only to 6mA during recording.
- • **Effortless Integration:** Four SPI pogo pins and dual LEDs for easy connection and real-time status updates.
- • **Plug & Play Simplicity:** Preprogrammed ATmega328 with bootloader for instant, hassle-free setup.
- • **Blazing Fast Data Capture:** Configurable baud rates up to 115200bps ensure no data is left behind.

## Overview

The SparkFun OpenLog is an open-source data logger designed for professionals who demand reliable, high-speed serial data recording. Supporting microSD cards up to 32GB with FAT16/32, it offers configurable baud rates up to 115200bps and comes preprogrammed with an ATmega328 and bootloader for quick deployment. Its flexible 3.3V-12V input range, four SPI pogo pins, and power-efficient design make it the perfect companion for seamless data capture in any project.

## 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.

## Features

- VCC Input: 3.3V-12V (Recommended 3.3V-5V); Configurable baud rates (up to 115200bps)
- Log to microSD FAT16/32 cards up to 32GB: Store huge amounts of data from your project
- Preprogrammed ATmega328 and bootloader: Simple command interface
- Four SPI pogo pins: For a simple connection to your project; Two LEDs: indicate writing status
- Two recording speeds: 2mA idle when nothing to record;, 6mA at maximum recording rate

## Product Details

- **Compatible Devices:** Arduino Uno compatible devices
- **Brand:** SparkFun
- **Hardware Interface:** MicroSD
- **Microphone Form Factor:** Built-In
- **Format:** Unknown format
- **Headphones Jack:** No headphones jack
- **Memory Storage Capacity:** 64 GB
- **Item Weight:** 0.01 Kilograms
- **Digital Recording Time:** 149 hours
- **Microphone Operation Mode:** Mono

## 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

### ⭐⭐⭐⭐⭐ Plug and play
*by C***R on October 11, 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.

### ⭐ Breaks very quickly
*by J***W on November 13, 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.

### ⭐⭐⭐ Too complicated
*by W***M on October 28, 2023*

Only for technicians. It sits in a drawer unopened. No idea how to use it.

## 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 Portugal*
*Store origin: PT*
*Last updated: 2026-04-01*