SparkFun OpenLog Hookup Guide

Introduction

The SparkFun OpenLog is a simple, open-source data logger designed to capture serial data from your projects. It provides a straightforward serial interface for logging information to a microSD card, making it an ideal component for various embedded systems and data acquisition tasks.

Key Features and Hardware

This guide details the OpenLog's capabilities, including its ATmega328 microcontroller running at 16MHz and its primary serial UART interface via an FTDI header. It also covers the microSD card slot for data storage and status LEDs for operational feedback.

Getting Started: Materials and Connections

To begin using the OpenLog, essential components such as an Arduino Pro Mini, an FTDI Basic Breakout, jumper wires, and a microSD card are required. The guide provides step-by-step instructions for making the necessary hardware connections, including serial communication and SPI interfaces, for both reprogramming and data logging.

Required Components:

• SparkFun OpenLog (DEV-13712)
• Arduino Pro Mini (e.g., 3.3V/8MHz)
• SparkFun FTDI Basic Breakout (3.3V)
• microSD Card (FAT16 or FAT32 formatted)
• Jumper Wires

Firmware and Software

The document explains how to compile and load firmware onto the OpenLog, treating it similarly to an Arduino Uno. It details the use of the Arduino IDE, necessary libraries (SdFat, SerialPort), and provides links to firmware bundles and GitHub repositories for the latest versions. Various example sketches are included for testing and specific logging tasks.

Command Interface and Configuration

Users can interact with the OpenLog via a serial terminal to manage files (create, append, read, delete), navigate directories, and access low-level commands. System settings, such as baud rate, echo mode, and logging modes (New Log, Sequential Log, Command Prompt), can be configured either through the serial terminal or by modifying the CONFIG.TXT file on the microSD card.

Troubleshooting and Best Practices

The guide offers solutions for common issues, including microSD card initialization errors, baud rate problems, and file naming conventions. It emphasizes best practices for formatting microSD cards, managing buffer overflows at different baud rates, and implementing delays for reliable data capture.

Further Resources

For additional support, troubleshooting, and project inspiration, the document directs users to the SparkFun OpenLog GitHub repository, related tutorials, and community forums. This ensures users can find solutions and explore advanced applications.

Additional Resources:

• OpenLog GitHub Repository
• SparkFun Tutorials