The SparkFun Qwiic OpenLog Kit includes everything you need to start logging serial data using the Qwiic ecosystem. Built around the Qwiic OpenLog data logger, a RedBoard Qwiic, and a Qwiic Mux, this kit lets you record up to 20,000 bytes per second to a microSD card — ideal for scientific data collection and debugging.

The Qwiic OpenLog supports clock stretching to prevent data corruption during high-speed logging at 400 kHz. All boards connect via Qwiic cables with no soldering required, though 0.1″ header pins are also broken out for breadboard use.

Key Features

• Qwiic OpenLog – I2C data logger recording up to 20,000 bytes/sec to microSD
• RedBoard Qwiic – Arduino UNO-compatible development board with Qwiic connector
• Qwiic Mux (TCA9548A) – 8-channel I2C multiplexer for devices sharing the same address
• 32 GB MicroSD Card – Class 10 with adapter, ready for logging
• Solderless Setup – Qwiic cables included for plug-and-play connections
• Clock Stretching – Prevents data corruption during high-speed I2C logging

Ideal For

• Scientific data logging and environmental monitoring
• Debugging serial data streams
• Multi-sensor I2C projects with address conflicts
• Getting started with the Qwiic ecosystem

Package Contents

• 1× SparkFun Qwiic OpenLog
• 1× SparkFun RedBoard Qwiic
• 1× SparkFun Qwiic Mux Breakout – 8 Channel (TCA9548A)
• 1× Reversible USB-A to Micro-B Cable (0.8m)
• 1× Flexible Qwiic Cable (50mm)
• 1× Flexible Qwiic Cable (100mm)
• 1× MicroSD Card with Adapter – 32 GB (Class 10)

Resources

• Qwiic OpenLog Hookup Guide
• RedBoard Qwiic Hookup Guide
• Qwiic Mux Hookup Guide
• OpenLog Arduino Library
• I2C Mux Arduino Library