SEN-14001 SparkFun

The SparkFun 9DoF Razor IMU M0 (SEN-14001) is a programmable Inertial Measurement Unit that combines an MPU-9250 9-axis sensor (accelerometer, gyroscope, and magnetometer) with an ATSAMD21 32-bit ARM Cortex-M0+ microcontroller. It is ideal for motion tracking, robotics, and step-counting. [1, 2, 3]While retired by SparkFun, the board remains popular for DIY engineering projects and can still be purchased or referenced via DigiKey and Mouser.Core Specifications

• Microcontroller: ATSAMD21 (Arduino Zero-compatible)
• Sensor: MPU-9250 (3-axis accelerometer, 3-axis gyro, 3-axis compass)
• Connectivity: Micro-B USB, UART (serial), and MicroSD slot for local data logging
• Form Factor: Tiny, compact board optimized to be strapped directly to limbs, drones, or moving parts [1, 2]

Key Features

• Fully Reprogrammable: Because it features a built-in SAMD21 microcontroller, it can be programmed directly in the Arduino IDE to calculate orientation (Euler angles, quaternions) on the fly without needing a separate host computer.
• Onboard Data Logging: Features an integrated MicroSD card socket so you can log raw or processed sensor data directly to a CSV file.