Adafruit GEMMA M0 - Miniature wearable electronic platform POL_Electronics Prototyping The SparkFun OpenLog is an

The SparkFun OpenLog is an open source data logger that works over a simple serial connection and supports microSD cards up to 32GB

Would you like to store diagnostic information so that the repair engineer can access it using their smart phone

When the indicator is always on

The fit between the adapters and this wheel can be tight

As the above diagram shows

Adafruit GEMMA M0 - Miniature wearable electronic platform POL_Electronics Prototyping The SparkFun OpenLog is anThe Adafruit Gemma M0 is a super small microcontroller board, with just enough built in to create many simple projects. It may look small and cute: round, about the size of a quarter, with friendly alligator clip sew pads. But don't be fooled! The Gemma M0 is incredibly powerful! We've taken the same form factor we used for the original ATtiny85 based Gemma and gave it an upgrade. The Gemma M0 has swapped out the lightweight ATtiny85 for a ATSAMD21E18